WO2024090434A1 - 作業機 - Google Patents
作業機 Download PDFInfo
- Publication number
- WO2024090434A1 WO2024090434A1 PCT/JP2023/038343 JP2023038343W WO2024090434A1 WO 2024090434 A1 WO2024090434 A1 WO 2024090434A1 JP 2023038343 W JP2023038343 W JP 2023038343W WO 2024090434 A1 WO2024090434 A1 WO 2024090434A1
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- WO
- WIPO (PCT)
- Prior art keywords
- striking
- motor
- side engaging
- engagement
- rotating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/008—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
- B25C1/047—Mechanical details
Definitions
- the present invention relates to a work machine such as a driving machine.
- One example of a work machine is a fastener driver that has a driver blade that strikes the fastener, a pinwheel that pushes the driver blade upward, and a motor that rotates the pinwheel.
- Patent Document 1 discloses a fastener driver equipped with a mechanism in which the pin of a pinwheel engages with a rack provided on the driver blade, and after the fastener is driven into the driver blade, the driver blade is pushed up by the rotation of the pinwheel.
- the driver blade may collide with the final pin in the direction of rotation of the pinwheel during driving, which may result in damage to the pin. If the pin is damaged, parts may need to be replaced, which may reduce the usability of the driver.
- the object of the present invention is to provide a work machine with improved convenience.
- the working machine of the present invention comprises a motor, a striking section capable of striking a fastener by moving to one side in a first direction, a biasing section for biasing the striking section to one side in the first direction, a rotating section that rotates by the driving force of the motor and is engageable with and disengageable from the striking section, and a control section for controlling the driving of the motor,
- the rotating section has a plurality of rotating section side engaging sections arranged in a line in the rotation direction of the rotating section
- the striking section has a plurality of striking section side engaging sections arranged in a line in the first direction and engageable with the plurality of rotating section side engaging sections
- the striking section moves to the other side in the first direction when the rotating section rotates with the plurality of striking section side engaging sections engaged with the plurality of rotating section side engaging sections, and when the engagement with the rotating section is released, the striking section moves to one side in the first direction by the biasing force of the biasing section to strike the fastener, performing a driving operation
- Another working machine of the present invention includes a motor, a striking unit capable of striking a stopper by moving to one side in a first direction, a biasing unit that biases the striking unit to one side in the first direction, a rotating unit that rotates by the driving force of the motor and is capable of engaging with and disengaging from the striking unit, and a control unit that controls the driving of the motor, and the rotating unit has a plurality of rotating unit side engaging portions arranged in a line in the rotation direction of the rotating unit, and the striking unit has a plurality of striking unit side engaging portions arranged in a line in the first direction and capable of engaging with the plurality of rotating unit side engaging portions.
- the striking portion has a mating portion, and when the rotating portion rotates with the multiple striking portion side engaging portions engaged with the multiple striking portion side engaging portions, the striking portion moves to the other side in the first direction, and when the engagement with the rotating portion is released, the striking portion moves to one side in the first direction due to the biasing force of the biasing portion, thereby striking the fastener, thereby performing a driving action, and the striking portion has a plurality of intermediate portions provided between each of the multiple striking portion side engaging portions, and any of the multiple intermediate portions has a deformed intermediate portion having a shape different from the other intermediate portions.
- Another working machine of the present invention includes a motor, a striking unit capable of striking a stopper by moving toward one side in a first direction, a biasing unit that biases the striking unit toward one side in the first direction, a rotating unit that rotates by a driving force of the motor and is engageable with and disengageable from the striking unit, and a control unit that controls driving of the motor, wherein the rotating unit has a plurality of rotating unit side engaging portions arranged side by side in a rotation direction of the rotating unit, the striking unit has a plurality of striking unit side engaging portions arranged side by side in the first direction and engageable with the plurality of rotating unit side engaging portions, and the striking unit has a plurality of striking unit side engaging portions that are engaged with the plurality of rotating unit side engaging portions.
- the control part includes a learning model that estimates the engagement state between the multiple striking part side engaging parts and the multiple rotating part side engaging parts based on a change in the current value of the motor or a change in the rotation speed of the motor, and a calculation part that controls the drive of the motor according to the engagement state between the multiple striking part side engaging parts and the multiple rotating part side engaging parts estimated by the learning model.
- the present invention can improve the convenience of the work machine.
- FIG. 1 is a perspective view showing an external structure of a working machine according to a first embodiment of the present invention
- FIG. 2 is a side view showing the structure of the working machine shown in FIG. 1
- 3 is a cross-sectional view showing the structure cut along line AA in FIG. 2.
- FIG. 2 is a block diagram of a control system for the work machine shown in FIG. 1
- 2A and 2B are diagrams showing the structure of a striking unit that is assembled to the working machine shown in FIG. 1 , in which FIG. 2 is a time series diagram showing the state of the blade detector switch and the Hall IC count in a normal sequence related to the engagement state of the rack and pin of the work machine of FIG. 1.
- 7A, 7B and 7C are conceptual diagrams showing the engagement states of the rack and the pin corresponding to time points T1, T2 and T3 in the normal sequence of FIG. 6.
- 7A and 7B are conceptual diagrams showing the engagement state of the rack and the pin corresponding to time T4 and time T5 in the normal sequence of FIG. 6.
- 7A and 7B are conceptual diagrams showing the engagement state of the rack and the pin corresponding to time T6 and time T7 in the normal sequence of FIG. 6.
- FIG. 2 is a time series diagram showing the state of the blade detector switch and the Hall IC count in a misalignment sequence related to the engagement state of the rack and pin of the work machine of FIG. 1.
- 10A, 10B, and 10C are conceptual diagrams showing the engaged states of the rack and the pin corresponding to time points U1, U2, and U3 in the misalignment sequence of FIG. 11A and 11B are conceptual diagrams showing the engaged states of the rack and the pin corresponding to time points U4 and U5 in the misalignment sequence of FIG. 10.
- 11A and 11B are conceptual diagrams showing the engaged state of the rack and the pin corresponding to time U6 and time U7 in the misalignment sequence of FIG. 10.
- 11A and 11B are conceptual diagrams showing the engaged state of the rack and the pin corresponding to time U8 and time U9 in the misalignment sequence of FIG. 4 is a flowchart of a misalignment detection control in the motor control of the work machine of FIG.
- FIG. 4 is a flowchart of a misaligned release control in the motor control of the work machine of FIG. 1 .
- 16 is a flowchart of an operation in a misaligned mode in the misaligned detection control of FIG. 15 .
- FIG. 6 is a side cross-sectional view showing the internal structure of a working machine according to a second embodiment of the present invention.
- FIG. 11 is a circuit block diagram of a work machine according to a second embodiment.
- FIG. 11 is a block diagram of a control unit of a work machine according to a second embodiment.
- 11A and 11B are diagrams showing the engaged state of the rack and pin of a work machine of embodiment 2, in which FIG. 11A is a side view showing the engaged state of the rack and pin, and FIG.
- 11B is a partially enlarged view showing the shapes of multiple racks.
- 11 is a flowchart of a misalignment determination control in a work machine according to a second embodiment.
- 13 is a graph showing the relationship between time for one driving cycle and battery current value in a working machine according to a second embodiment.
- 5 is a graph showing the relationship between time and battery current value in normal lift-up/abnormal lift-up at the start of lift-up in the engaged state of the rack and pin shown in FIG. 4 .
- 11A and 11B are diagrams showing the engagement state of the rack and pin of a work machine in a modified example of embodiment 2, where FIG. 11A is a side view showing the engagement state of the rack and pin, and FIG.
- FIG. 11B is a partially enlarged view showing the shape of multiple racks.
- 13 is a graph showing the relationship between time and battery current value during normal lift-up/abnormal lift-up at the start of lift-up of a work machine in a modified example of the second embodiment.
- FIG. 11 is a block diagram of a control unit of a work machine according to a third embodiment.
- FIG. 13 is a side view showing an engaged state of the rack and pin of the work machine of the third embodiment.
- 13 is a flowchart of a misalignment determination control in a work machine according to a third embodiment.
- 13 is a graph showing the relationship between time and battery current value during normal lift-up/abnormal lift-up at the start of lift-up of the work machine of the third embodiment.
- FIG. 13 is a graph showing the relationship between time and motor rotation speed in normal lift-up/abnormal lift-up at the start of lift-up of the work machine of the third embodiment.
- FIG. 13 is a network configuration diagram showing the structure of a neural network in normal lift-up of a work machine according to a third embodiment.
- the driving machine (working machine) 10 shown in Figs. 1 to 4 is an air-compression type working machine, and has a housing 11, an impact section 12, a nose section 13, a power supply section 14, an electric motor (motor) 15, a winding mechanism 17, and a pressure accumulator vessel 18.
- the housing 11 is an outer shell element of the driving machine 10, and has a cylinder case 19, a handle 20, a motor case 21, and an attachment section 22.
- the cylinder case 19 is cylindrical, and the handle 20 and the motor case 21 are connected to the cylinder case 19.
- the attachment section 22 is connected to the handle 20 and the motor case 21.
- the power supply unit 14 can be attached to and detached from the mounting portion 22.
- the electric motor 15 is disposed in the motor case 21.
- the cylinder case 19 is provided with a head cover 25, and the pressure accumulator vessel 18 is disposed within both the cylinder case 19 and the head cover 25.
- a cylinder 27 is housed in the cylinder case 19, and the pressure accumulator 18 has a cap 23 and a holder 24 attached to the cylinder 27.
- the cylinder 27 is made of metal, for example, aluminum or iron.
- the cylinder 27 is positioned in the direction along the center line A1 and in the radial direction with respect to the cylinder case 19.
- the center line A1 passes through the center of the cylinder 27.
- the radial direction is the radial direction of an imaginary circle centered on the center line A1.
- a pressure chamber 26 is formed throughout the pressure accumulator 18 and the cylinder 27.
- the pressure chamber 26 is filled with compressed gas.
- the compressed gas may be air or an inert gas. Examples of the inert gas include nitrogen gas and rare gas. In this embodiment 1, an example in which the pressure chamber 26 is filled with air will be described.
- the pressure chamber 26 is also a biasing portion that biases the striking portion 12 downward (one side) in the vertical direction (first direction) M1.
- the striking section 12 is disposed from the inside to the outside of the housing 11.
- the striking section 12 has a piston 28 and a driver blade 29.
- the piston 28 can operate in a direction along the center line A1 within the cylinder 27.
- An annular seal member 84 is attached to the outer peripheral surface of the piston 28.
- the seal member 84 contacts the inner peripheral surface of the cylinder 27 to form a seal surface.
- the driver blade 29 is, for example, made of metal, non-ferrous metal, or steel.
- the piston 28 and the driver blade 29 are provided as separate members, and the piston 28 and the driver blade 29 are connected to each other.
- the striking portion 12 can strike the nail (fastener) 78 by moving downward (one side) in the vertical direction (first direction) M1.
- the nose portion 13 is disposed on both the inside and outside of the cylinder case 19.
- the nose portion 13 has a bumper support portion 31, an injection portion 32, and a tube portion 33.
- the bumper support portion 31 is cylindrical.
- a bumper 35 is disposed within the bumper support portion 31.
- the bumper 35 may be made of either synthetic rubber or silicone rubber.
- the bumper 35 has a guide hole 36.
- the center line A1 passes through the guide hole 36.
- the driver blade 29 is disposed within the guide hole of the bumper support portion 31 and within the guide hole 36.
- the striking portion 12 can operate in a driving direction D1 and a return direction D2 along the center line A1.
- the driving direction D1 and the return direction D2 are opposite to each other.
- the driving direction D1 is the direction in which the piston 28 approaches the bumper 35.
- the return direction D2 is the direction in which the piston 28 moves away from the bumper 35.
- the striking section 12 is constantly biased in the striking direction D1 by the gas pressure in the pressure chamber 26.
- the operation of the striking section 12 in the striking direction D1 can be defined as descent.
- the operation of the striking section 12 in the return direction D2 can be defined as ascent.
- the striking direction D1 is the same as the lower (one side) of the vertical direction (first direction) M1.
- the return direction D2 is the same as the upper (other side) of the vertical direction (first direction) M1.
- the ejection portion 32 is connected to the bumper support portion 31 and protrudes from the bumper support portion 31 in a direction along the center line A1.
- the ejection portion 32 has an ejection path 37, which is provided along the center line A1.
- the driver blade 29 can operate in the ejection path 37 in a direction along the center line A1.
- the electric motor 15 is also disposed within the motor case 21.
- the electric motor 15 has a rotor 39 and a stator 40, as shown in FIG. 4.
- the stator 40 is attached to the motor case 21.
- the rotor 39 is rotatably supported by the motor case 21 via a bearing (not shown).
- the electric motor 15 is, for example, a brushless motor, and when a voltage is applied to the electric motor 15, the rotor 39 rotates about the center line A2.
- a reduction mechanism (not shown) is provided within the motor case 21.
- the reduction mechanism includes multiple planetary gear mechanisms.
- a rotating shaft 46 is provided within the cylindrical portion 33.
- the rotating shaft 46 and the reduction mechanism are arranged concentrically around the center line A2.
- the reduction mechanism is disposed on the power transmission path from the electric motor 15 to the rotating shaft 46, and is a mechanism that reduces the rotation of the rotor 39 of the electric motor 15 and transmits it to the winding mechanism 17.
- the winding mechanism 17 is a mechanism that converts the rotational force of the rotating shaft 46 into a force that biases the striking portion 12 in the return direction D2.
- the driver 10 is also provided with a trigger 75 and a trigger switch 109 (see FIG. 4).
- the trigger 75 and the trigger switch 109 are provided on the handle 20.
- the trigger switch 109 detects whether or not an operating force is applied to the trigger 75, and outputs a signal according to the detection result.
- the power supply unit 14 has a housing case 76 and a battery housed within the housing case 76.
- the battery has a plurality of battery cells. These battery cells are secondary batteries that can be charged and discharged, and the battery cells can be any known battery cell, such as a lithium ion battery, a nickel metal hydride battery, a lithium ion polymer battery, or a nickel cadmium battery.
- the driving machine 10 is also provided with a magazine 77.
- the magazine 77 is supported by the ejection section 32 and the mounting section 22. Nails (fasteners) 78 are stored in the magazine 77.
- the magazine 77 has a feeder that sends the nails 78 in the magazine 77 to the ejection path 37. That is, the feeder moves the nails 78 in the magazine 77 forward in the front-rear direction N1.
- the ejection section 32 is made of metal or synthetic resin.
- a push lever 79 is attached to the ejection section 32. The push lever 79 can operate within a predetermined range of directions along the center line A1 relative to the ejection section 32.
- An elastic member (not shown) is provided to bias the push lever 79 in a direction along the center line A1.
- the elastic member is, for example, a metal spring, and biases the push lever 79 in a direction away from the bumper support section 31.
- the control unit 82 shown in FIG. 4 that the driving machine 10 is equipped with will be described.
- the control unit 82 is provided in the mounting unit 22, and mainly controls the driving of the electric motor 15.
- the control unit 82 is also connected to the inverter circuit 110 shown in FIG. 4.
- the inverter circuit 110 connects and disconnects the stator 40 of the electric motor 15 and the power supply unit 14.
- the inverter circuit 110 has multiple switching elements Q1, Q2, Q3, Q4, Q5, and Q6, and each of the multiple switching elements Q1, Q2, Q3, Q4, Q5, and Q6 can be turned on and off.
- the control unit 82 controls the inverter circuit 110 via the control signal output circuit 103 to rotate and stop the electric motor 15, or to control the rotation speed and rotation direction of the electric motor 15.
- the driver 10 also has a blade detector switch (first switch, also called BDSW) 80a that detects the position of the driver blade 29, a current detection circuit 100, a rotational position detection circuit 101 of the rotor 39, a power switch 102, and a power switch circuit 102a as input elements that send signals to the control unit 82.
- the blade detector switch 80a is connected to the control unit 82 via a blade detector switch operation detection circuit 80b, the rotational position detection circuit 101 is connected to the control unit 82 via a rotation speed detection circuit 101d, and the power switch circuit 102a is connected to the control unit 82 via a power supply voltage supply circuit 105.
- a latch release switch (second switch) 81 that releases the latch in the engagement between the driver blade 29 and the pinwheel (rotating unit) 50 described later, a nail remaining amount switch 107 that detects the remaining amount of nails 78, a voltage detection circuit 106, a push lever switch 108, and a trigger switch 109.
- the latch release switch 81 is connected to the control unit 82 via a latch release switch operation detection circuit 81a.
- the latch release switch 81 is installed in the operation unit 72 provided in the mounting portion 22 of the housing 11 of the nail driver 10.
- the nail remaining amount switch 107 is connected to the control unit 82 via a nail remaining amount switch operation detection circuit 107a.
- the push lever switch 108 is connected to the control unit 82 via a push lever switch operation detection circuit 108a
- the trigger switch 109 is connected to the control unit 82 via a trigger switch operation detection circuit 109a.
- the push lever 79 shown in FIG. 2 can be switched between ON and OFF by being pressed against the mating material 30 by the operator, and the push lever switch 108 is turned ON and outputs a signal, for example, when the push lever 79 is pressed against the mating material 30.
- the trigger switch 109 outputs a signal when the operator operates the trigger 75 provided on the handle 20 to turn the trigger switch 109 ON.
- the rotational position detection circuit 101 detects the rotational position of the rotor 39 using rotational position detection elements (rotational position detection units) 101a, 101b, and 101c, which are Hall ICs, and outputs a signal.
- the control unit 82 then processes the signals sent from the rotational position detection circuit 101, the blade detector switch 80a, the push lever switch 108, the trigger switch 109, etc., to control the inverter circuit 110. In this way, the control unit 82 controls the stopping, rotation, rotation direction, and rotation speed of the electric motor 15.
- the winding mechanism 17 includes a driver blade 29, a plurality of striking part side engaging parts provided on the driver blade 29, a pinwheel (rotating part) 50, and a plurality of rotating part side engaging parts provided on the pinwheel 50.
- the striking part side engaging parts and the rotating part side engaging parts can be engaged with each other.
- the cross-sectional shape of the driver blade 29 is approximately rectangular.
- the driver blade 29 is provided with racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 as a plurality of striking part side engaging parts.
- racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 are provided integrally with the driver blade 29. Furthermore, the racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 are disposed between the tip 29a of the driver blade 29 in the direction along the center line A1 and the piston 28.
- the racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 are arranged in line in the vertical direction M1 and are disposed in this order in the direction along the center line A1.
- the racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 are protrusions provided on the edge of the driver blade 29.
- rack 61 is positioned at the front, i.e., first, in the return direction D2.
- racks 62, 63, 64, 65, 66, 67, 68, 69, and 70 are positioned behind rack 61.
- the driver blade 29 is provided with a rib 29c on the side of the blade body 29b.
- the rib 29c is provided on the blade body 29b along the vertical direction M1 of the driver blade 29.
- the rib 29c is provided upward from the tip 29a of the blade body 29b to a predetermined height, and protrudes in a direction that forms an angle of 90° with the protruding direction of each rack.
- the rib 29c is provided so as to be engageable with the blade detector switch 80a provided on the nose portion 13 shown in FIG. 3.
- the driver blade 29 and the blade detector switch 80a are in a positional relationship such that the driver blade 29 and the blade detector switch 80a engage with each other within a predetermined range when the driver blade 29 moves in the vertical direction M1.
- control unit 82 detects the position of the striking portion 12, including the driver blade 29, in the direction of the center line A1 by processing the on/off signal of the blade detector switch 80a generated by the engagement between the rib 29c of the driver blade 29 and the blade detector switch 80a.
- the pinwheel 50 is attached to the rotating shaft 46.
- the pinwheel 50 is a rotating part that rotates by the driving force of the electric motor 15.
- the pinwheel 50 can be engaged with the striking part 12, and can also be disengaged from the striking part 12.
- the pinwheel 50 is made of metal, non-ferrous metal, or steel, for example.
- the pinwheel 50 rotates about a center line A2.
- the center line A2 is disposed at a distance from the driver blade 29 in the left-right direction R1 in a direction that intersects with the operating direction of the striking part 12.
- the pinwheel 50 has multiple rotating part side engaging parts arranged side by side in the rotation direction E1.
- ten pins 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 are provided on the pinwheel 50.
- the pins 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 are provided separately from the pinwheel 50 and are fixed so as to protrude from the disk surface of the pinwheel 50.
- the pins 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 are arranged on the same circumference centered on the center line A2.
- the pinwheel 50 also has a notch 50a formed in a second region of a predetermined angle in the rotation direction E1 of the pinwheel 50.
- the notch 50a is formed in a 90° region.
- the minimum outer diameter of the notch 50a centered on the center line A2 is smaller than the maximum outer diameter of the first region where the notch 50a is not formed.
- the first region where the notch 50a is not formed is a region of approximately 270° in the rotation direction E1 of the pinwheel 50.
- the pins 51, 52, 53, 54, 55, 56, 57, 58, 59, and 60 of the pinwheel 50 and the racks 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 of the driver blade 29 are arranged in overlapping positions along the center line A2, and are in a mutually engaging positional relationship.
- the pinwheel 50 rotates counterclockwise in FIG. 3 by the rotational force of the electric motor 15.
- the pin 51 is arranged in a second region in the rotational direction E1 of the pinwheel 50, and the pins 52, 53, 54, 55, 56, 57, 58, 59, and 60 are arranged in a first region in the rotational direction E1 of the pinwheel 50.
- the pins 52, 53, 54, 55, 56, 57, 58, 59, and 60 are arranged in this order along the rotational direction E1 of the pinwheel 50.
- the pin 51 is located at the front, i.e., first, in the rotational direction E1 during one rotation of the pinwheel 50.
- pins 52, 53, 54, 55, 56, 57, 58, 59, and 60 are located behind pin 51. Therefore, when the pinwheel 50 rotates with the striking portion 12 stopped, among the multiple pins, pin 51 approaches the operating area of the driver blade 29 first in the rotation direction E1 of the pinwheel 50.
- the rotational position which is the position of the pinwheel 50 in the rotational direction E1
- rotational position detection elements rotational position detection units 101a, 101b, and 101c, which are Hall ICs that detect the position of the rotor 39 in the rotational direction E1.
- the driving machine 10 is also equipped with a striking unit position detection unit 80 that detects the striking unit position, which is the position of the striking unit 12 in the vertical direction M1, and the striking unit position detection unit 80 includes a blade detector switch 80a that can come into contact with the driver blade 29 of the striking unit 12.
- the striking unit 12 moves from the standby position to the other side (upper) in the vertical direction M1 as the pinwheel 50 rotates while engaged with the striking unit 12.
- the pressure (biasing force) from the pressure chamber 26 causes the striking unit 12 to move to one side (lower) in the vertical direction M1, thereby striking the nail 78.
- the movement of the striking unit 12 to the other side (upper) in the vertical direction M1 and the movement of the striking unit 12 to one side (lower) in the vertical direction M1, which are necessary to strike the nail 78, correspond to the driving-in movement.
- the control unit 82 determines whether the driving operation by the striking unit 12 is a first driving operation in which all of the pins (rotating unit side engagement unit) engage with the rack (striking unit side engagement unit) of the driver blade 29 (in a predetermined engagement relationship), or a second driving operation in which some of the pins do not engage with the rack of the driver blade 29 (not in a predetermined engagement relationship) based on the rotation position of the pinwheel 50 and the striking unit position of the striking unit 12.
- the first driving operation is a normal driving operation in which there is no misalignment in the engagement between the striking unit 12 and the pinwheel 50.
- the second driving operation is a driving operation in which there is a misalignment in the engagement between the striking unit 12 and the pinwheel 50.
- the driving machine 10 detects the positions of the striking unit 12 and the pinwheel 50, and the control unit 82 determines whether there is a misalignment in the engagement between the striking unit 12 and the pinwheel 50.
- the above determination is made by counting the rotation position detection element, which is a Hall IC.
- the misalignment release switch 81 installed on the operating section 72 of the driving machine 10 is a switch that, when a misalignment is detected in the engagement between the striking section 12 and the pinwheel 50, is operated by the operator with the push lever 79 and the trigger 75 both turned on to start the reverse rotation of the pinwheel 50.
- the misalignment release switch 81 is operated by the operator, causing the misalignment release switch 81 to start the reverse rotation of the pinwheel 50.
- the misalignment release switch 81 by operating the misalignment release switch 81, the operator can reverse the rotation of the pinwheel 50 (rotate in the opposite direction to the rotation direction E1) to release the misalignment in the engagement between the striking section 12 and the pinwheel 50.
- step S1 shown in FIG. 15 when the control unit 82 detects at least one of the following: that no operating force is being applied to the trigger 75, or that the push lever 79 is not being pressed against the opposing material 30, the control unit 82 stops supplying power to the electric motor 15. As a result, the electric motor 15 stops, and the striking unit 12 stops in the standby position, as shown at time T1 in FIG. 7(a). At time T1, which is the standby position, the blade detector switch (BDSW) 80a is engaged with the rib 29c of the driver blade 29, and is therefore in the ON state.
- BDSW blade detector switch
- control unit 82 When the control unit 82 detects that an operating force is applied to the trigger 75 and that the push lever 79 is pressed against the opposing material 30, it executes the judgment of the "motor forward rotation drive command" in step S2 of FIG. 15. If the judgment is Yes, the power supply unit 14 applies a voltage to the electric motor 15 to rotate the electric motor 15 forward. This starts the driving operation. If the judgment of the "motor forward rotation drive command" in step S2 is No, it executes the judgment of the "motor forward rotation drive command” in step S2 again. When the electric motor 15 rotates forward, the rotational force of the electric motor 15 is transmitted to the rotating shaft 46 via a reduction mechanism not shown. Then, the rotating shaft 46 and the pinwheel 50 start to rotate counterclockwise (rotation direction E1) in FIG. 3.
- the Hall IC count at time T3 is set to 0 (zero).
- the striking part 12 then descends, causing the driver blade 29 to strike one nail 78 located in the ejection path 37, and the nail 78 is driven into the target material 30.
- the control unit 82 continues to rotate the electric motor 15 even after the striking unit 12 has driven the nail 78 and reached the bottom dead center.
- the pinwheel 50 rotates counterclockwise (rotation direction E1) as shown in FIG. 3, and the pin 51 approaches the rack 61.
- the blade detector switch 80a starts engaging with the rib 29c of the driver blade 29 at time T5 as shown in FIG. 8(b). That is, as shown at time T5 in FIG. 6, the blade detector switch (BDSW) 80a is switched on (ON). That is, the determination of "Blade detector switch OFF ⁇ ON?" shown in step S4 of FIG. 15 is executed. If the determination in step S4 is Yes, the "Count determination (missing engagement determination) within threshold?” in step S5 is executed.
- the control unit 82 determines whether or not a mis-engagement has occurred in the engagement between the striking part 12 and the pinwheel 50.
- step S4 determines whether the determination in step S4 is No, the determination of blade detector switch OFF ⁇ ON? in step S4 is executed again.
- the determination of the mis-engagement by the control unit 82 in step S5 is performed using the Hall IC count at time T5 in FIG. 6.
- the Hall IC count at time T5 in FIG. 6 is 990.
- the threshold for determining whether or not the pinwheel 50 is misaligned is preset based on the dimensions and reduction ratio of each component, and is set to, for example, a Hall IC count of 930 to 1050. As a result, for example, if the Hall IC count at time T5 is 990, the control unit 82 determines that the pinwheel 50 is not misaligned because it is within the range of the threshold of 930 to 1050 (the control unit 82 determines that the engagement between the striking unit 12 and the pinwheel 50 is normal engagement). In other words, the control unit 82 determines that the engagement between the striking unit 12 and the pinwheel 50 is normal engagement, not misaligned, at time T5 in FIG.
- control unit 82 has cumulative information regarding the drive of the electric motor 15 that is accumulated while the electric motor 15 is driven during the striking operation of the striking unit 12, and detects the rotational position of the pinwheel 50 based on this cumulative information.
- the cumulative information is the amount of rotation of the electric motor 15.
- the control unit 82 determines whether the striking operation is the first striking operation (a striking operation by normal engagement without misalignment) or the second striking operation (a striking operation by misalignment) before the striking unit 12 reaches the standby position.
- the position of the striking unit 12 at time T5 when the blade detector switch (BDSW) 80a switches from off (OFF) to on (ON) is the position at which the control unit 82 determines whether the striking operation is the first striking operation or the second striking operation. If the position of the striking unit 12 at time T5 in FIG.
- the blade detector switch 80a of the striking unit position detection unit 80 comes into contact with the striking unit 12 when the striking unit 12 is located above the predetermined position in FIG. 8(b) in the vertical direction M1, as shown at time T6 in FIG. 9(a).
- step S5 of FIG. 15 if "Count determination (mis-hook determination) within threshold?" in step S5 of FIG. 15 is Yes, "Winding to specified count standby position" in step S6 of FIG. 15 is executed.
- the specified count is preset based on the dimensions and reduction ratio of each component, and is the Hall IC count of 250 in this embodiment 1. Note that the driving operation when "Count determination (mis-hook determination) within threshold?" in step S5 is No will be explained in the section on mis-hook engagement using FIGS. 10 to 14, which will be described later.
- step S6 By executing "winding to specified count standby position" in step S6, the electric motor 15 is rotated forward to raise the impact unit 12 toward the standby position. Then, the rotation of the electric motor 15 is stopped at time T6 in FIG. 9(a). That is, "motor stop” in step S7 in FIG. 15 is executed. Specifically, when the Hall IC count reaches 1240 at time T6 in FIG. 6, the electric motor 15 is braked. Thereafter, the electric motor 15 continues to rotate due to inertia, and the impact unit 12 stops at the standby position shown at time T7 in FIG. 9(b).
- the Hall IC count at time T7 is 1270, and the electric motor 15 rotates further after the brake is applied at time T6 to such an extent that the Hall IC count increases from 1240 to 1270 due to inertia, and then stops.
- the standby position of the striking part 12 during the striking operation shown at time T7 in FIG. 9(b) is located above the predetermined position of the striking part 12 in the up-down direction M1 shown at time T5 in FIG. 8(b).
- step S8 the Hall IC count is reset in step S8. That is, the Hall IC count is reset because the striking unit 12 has stopped at the standby position. This ends step S9.
- step S1 shown in FIG. 15 when the control unit 82 detects at least one of the following: that no operating force is being applied to the trigger 75, or that the push lever 79 is not being pressed against the opposing material 30, the control unit 82 stops supplying power to the electric motor 15. As a result, the electric motor 15 stops, and the striking unit 12 stops in the standby position, as shown at time T11 in FIG. 11(a). At time T11, which is the standby position, the blade detector switch (BDSW) 80a is engaged with the rib 29c of the driver blade 29, and is therefore in the ON state.
- BDSW blade detector switch
- control unit 82 When the control unit 82 detects that an operating force is applied to the trigger 75 and that the push lever 79 is pressed against the opposing material 30, it executes the judgment of the "motor forward rotation drive command" in step S2 of FIG. 15. If the judgment is Yes, the power supply unit 14 applies a voltage to the electric motor 15 to rotate the electric motor 15 forward. This starts the driving operation. If the judgment of the "motor forward rotation drive command" in step S2 is No, it executes the judgment of the "motor forward rotation drive command” in step S2 again. When the electric motor 15 rotates forward, the rotational force of the electric motor 15 is transmitted to the rotating shaft 46 via a reduction mechanism not shown. Then, the rotating shaft 46 and the pinwheel 50 start to rotate counterclockwise (rotation direction E1) in FIG. 3.
- the Hall IC count at time T13 is set to 0 (zero).
- the striking part 12 then descends, causing the driver blade 29 to strike one nail 78 located in the ejection path 37, and the nail 78 is driven into the target material 30.
- the control unit 82 continues to rotate the electric motor 15 even after the striking unit 12 has driven the nail 78 and reached the bottom dead center.
- the pinwheel 50 rotates counterclockwise (rotation direction E1) as shown in FIG. 3, and the pin of the pinwheel 50 approaches the rack of the driver blade 29.
- a misalignment occurs in which the pin 51 of the pinwheel 50 shown in FIG. 3 engages with the rack 62 of the driver blade 29. That is, a first pin engagement (one-step misalignment) occurs, as shown at time T14 in FIG. 10.
- step S4 the blade detector switch 80a starts engaging with the rib 29c of the driver blade 29 at time T15 as shown in FIG. 12(b). That is, as shown at time T15 in FIG. 10, the blade detector switch (BDSW) 80a is switched on (ON). That is, the blade detector switch OFF ⁇ ON? judgment shown in step S4 of FIG. 15 is executed. If the judgment in step S4 is Yes, the "Count judgment (missing engagement judgment) within threshold?" in step S5 is executed. Here, the control unit 82 judges whether or not a mis-engagement has occurred in the engagement between the striking part 12 and the pinwheel 50. On the other hand, if the judgment in step S4 is No, the blade detector switch OFF ⁇ ON? judgment in step S4 is executed again. The mis-engagement judgment by the control unit 82 in step S5 is performed using the Hall IC count at time T15 in FIG. 10.
- the Hall IC count at time T15 in FIG. 10 is 870.
- the threshold for determining whether the pinwheel 50 is misaligned is preset based on the dimensions and reduction ratio of each component, and is set to, for example, a Hall IC count of 930 to 1050. As a result, for example, if the Hall IC count at time T15 is 870, it is outside the range of the threshold 930 to 1050 and is smaller than the lower limit of the threshold 930, so the control unit 82 determines that a misalignment has occurred (determines that the engagement between the striking unit 12 and the pinwheel 50 is misaligned). That is, the control unit 82 determines that the engagement between the striking unit 12 and the pinwheel 50 is misaligned at time T15 in FIG.
- control unit 82 has cumulative information regarding the drive of the electric motor 15 that is accumulated while the electric motor 15 is driven during the striking operation of the striking unit 12, and detects the rotational position of the pinwheel 50 based on this cumulative information.
- the cumulative information is the amount of rotation of the electric motor 15.
- the control unit 82 determines whether the striking operation is the first striking operation (a striking operation by normal engagement without misalignment) or the second striking operation (a striking operation by misalignment) before the striking unit 12 reaches the standby position.
- the position of the striking unit 12 at time T15 when the blade detector switch (BDSW) 80a switches from off (OFF) to on (ON) is the position at which the control unit 82 determines whether the striking operation is the first striking operation or the second striking operation. If the position of the striking unit 12 at time T15 in FIG.
- the blade detector switch 80a of the striking unit position detection unit 80 abuts against the striking unit 12 when the striking unit 12 is located above the predetermined position in the vertical direction M1.
- the control part 82 determines that the striking action of the striking part 12 is the above-mentioned second striking action (striking action due to misalignment).
- step S5 of FIG. 15 if the answer to "Within count judgment (missing strike judgment) threshold?" in step S5 of FIG. 15 is Yes, the striking unit 12 is raised toward the standby position and stopped at the standby position by the same operation as that at time T6 and time T7 in FIG. 6. In other words, steps S6 to S9 in FIG. 15 are executed.
- step S10 determines whether the answer of "Count judgment (missing judgment) within threshold?" in step S5 is No. If the answer of "Count judgment (missing judgment) within threshold?" in step S5 is No, the "missing mode" in step S10 is executed. That is, if the control unit 82 judges that the engagement between the impact unit 12 and the pinwheel 50 is a miss-engagement, the "missing mode” in step S10 is executed. Details of the control in the "missing mode” in step S10 are described in the flowcharts of FIG. 16 and FIG. 17. First, at time T15 in FIG. 10, the operator turns on the miss-engagement release switch 81 shown in FIG. 1. At that time, in the operation of releasing the miss-engagement by turning on the miss-engagement release switch 81, the "start" in step 21 in FIG.
- step S22 executes the "push lever ON” determination in step S22.
- step S23 is executed.
- step S24 is executed. If the "unhook release switch ON” determination in step S24 is Yes, the "unhook flag ON” is executed in step S25, and the process proceeds to "End” in step S26.
- control unit 82 when the control unit 82 detects that the push lever 79 is being pressed against the mating material 30 by the operator, that the operator is applying an operating force to the trigger 75, and that the operator has turned on the hanging release switch 81, it executes the release flag ON in step S25 to start the hanging release operation.
- the "push lever ON” determination in step S22, the "trigger ON” determination in step S23, and the "hanging release switch ON” determination in step S24 are all No, the push lever ON determination in step S22 is executed again each time.
- step S10 in FIG. 15 In the operation to release the misaligned hook, the "misaligned hook mode" of step S10 in FIG. 15 is executed, and the “start” of step S31 in FIG. 17 starts the operation to release the misaligned hook.
- step S32 the "release flag ON” of step S32 is judged, and if the judgment of this "release flag ON” is Yes, the "calculation of the amount of winding in reverse” of step S33 is executed. If the judgment of the "release flag ON” of step S32 is No, the judgment of the "release flag ON” of step S32 is executed again.
- step S33 "calculation of the amount of winding down for reverse rotation", the Hall IC count is calculated each time when the blade detector switch 80a switches from OFF to ON at time T15 in FIG. 10.
- the Hall IC count at time T15 in FIG. 10 is 870.
- the pinwheel 50 is reversed while the Hall IC count is equivalent to 870 in order to release the misalignment, the first pin 51 of the pinwheel 50 and the first rack 61 of the driver blade 29 will collide. Therefore, in order to avoid the collision between the pin 51 of the pinwheel 50 and the rack 61 of the driver blade 29, the pinwheel 50 is reversed by a number slightly smaller than the Hall IC count 870.
- the number of counts smaller than the Hall IC count 870 to reverse is preset based on the dimensions and reduction ratio of each member, and in this embodiment 1, it is the Hall IC count 70.
- 800 is calculated by subtracting 70 from 870, and the pinwheel 50 is rotated in the reverse direction by an amount equivalent to 800 Hall IC counts to release the misalignment.
- step S34 executes the "motor reverse rotation command” of step S34 in FIG. 17.
- Execution of the "motor reverse rotation command” of step S34 starts the reverse rotation of the electric motor 15.
- execute the "start counting the amount of winding down” of step S35 This starts the reverse rotation of the pinwheel 50 and starts the descent of the striking unit 12.
- the control unit 82 determines that the striking unit 12 is performing the second striking operation (striking operation due to misalignment), it reverses the pinwheel 50 until the striking unit 12 reaches the bottom dead center position.
- the operator first operates (switches) the operation of the electric motor 15 by the push lever 79 and trigger 75 so that the electric motor 15 rotates (reverses), and then, while maintaining this state, the operator further operates the misalignment release switch 81 to start the reverse rotation of the pinwheel 50.
- step S36 the judgment of "Unwinding amount count value threshold reached?" is executed in step S36 in FIG. 17.
- the judgment in step S36 is Yes, as shown in FIG. 13(a) at time T16, the impact part 12 reaches the bottom dead center position, and the hook is released as shown in FIG. 10 at time T16.
- the Hall IC count at this time is 70, which is 870 minus 800.
- the "release completion judgment” in step S37 is executed, and further, the "motor stop command” in step S38 is executed.
- the reverse rotation of the electric motor 15 is stopped.
- step S39 the "motor forward rotation command" in step S39 is executed to start the rotation (forward rotation) of the electric motor 15.
- the "release flag OFF" in step S40 is executed, and the "end” in step S41 is executed. In other words, the hook mode is ended.
- step S42 the "Release error determination?" in step S42 is executed.
- the release error determination if the time required for the winding amount count to reach the threshold value is equal to or greater than the threshold value, or if the current value of the electric motor 15 during winding is equal to or greater than the threshold value, or if the rotation of the electric motor 15 is locked and the winding amount count no longer changes, then the determination is Yes, and the "Release error flag/motor stop command" in step S43 is executed to stop the electric motor 15, and the "end" of step S41 is reached. Note that if the "Release error determination” in step S42 is No, then the determination in step S36 "Has the winding amount count value reached the threshold value?" is executed again.
- step S11 of FIG. 15 If the determination of "Release error flag present?" in step S11 is Yes, the "Hall IC count reset" is executed in step S8. On the other hand, if the determination of "Release error flag present?" in step S11 is No, the electric motor 15 continues to rotate in the forward direction to raise the impact section 12.
- step S4 of FIG. 15 the determination of "Blade detector switch OFF ⁇ ON?” shown in step S4 of FIG. 15 is executed again. Then, if the determination in step S4 is Yes, the determination of "Count determination (misalignment determination) within threshold?" in step S5 is executed.
- the control unit 82 determines whether or not a misalignment has occurred in the engagement between the striking unit 12 and the pinwheel 50. The control unit 82 determines whether or not a misalignment has occurred in step S5 by using the Hall IC count at time T17 in FIG. 10. The position of the striking unit 12 at time T17 is the position where the blade detector switch 80a switches from OFF to ON, as shown in FIG. 13(b).
- the Hall IC count at time T17 when the blade detector switch 80a switches from OFF to ON is 990.
- a Hall IC count of 930 to 1050 is set in advance as a threshold for determining whether or not the blade is misaligned. Therefore, the determination at time T17 is within the threshold range, and the control unit 82 determines that the striking operation of the striking unit 12 is the first striking operation (a striking operation due to normal engagement without a misalignment).
- step S5 of FIG. 15 if "Within count judgment (mis-hook judgment) threshold?" in step S5 of FIG. 15 is Yes, "Winding to specified count standby position" in step S6 of FIG. 15 is executed.
- the electric motor 15 is rotated forward to raise the impact unit 12 toward the standby position. Then, the rotation of the electric motor 15 is stopped at time T18 in FIG. 14(a). That is, "Motor stop” in step S7 of FIG. 15 is executed. Specifically, when the Hall IC count reaches 1240 at time T18 in FIG. 10, the rotation of the electric motor 15 is braked.
- the electric motor 15 rotates due to inertia, and the impact unit 12 stops at the standby position shown at time T19 in FIG. 14(b).
- the Hall IC count at time T19 is 1270, and the electric motor 15 rotates further after the brakes are applied at time T18, causing the Hall IC count to increase from 1240 to 1270 due to inertia, and then stops.
- step S8 the Hall IC count is reset in step S8. That is, the Hall IC count is reset because the striking unit 12 has stopped at the standby position. This ends step S9.
- the Hall IC count value is outside the preset threshold range of 930 to 1050 and is greater than the upper threshold limit of 1050. If, in determining whether the pin is overhanging at time T15 in FIG. 10, the Hall IC count value is greater than the preset threshold value of 930 to 1050, the control unit 82 determines that damage to the first pin has occurred.
- the first pin (pin 51) may be damaged due to long-term use of the driving machine 10 or due to misalignment. If the first pin is damaged, the second pin (pin 52) and the first rack (rack 61) engage when the striking unit 12 starts to wind up (push up), and the tenth pin (last pin (pin 60)) and the ninth rack (second rack from the bottom 69) engage just before driving in. In the case of misalignment, the first pin (pin 51) and the second rack (rack 62) engage when the striking unit 12 starts to wind up, and the ninth pin (second pin from the back 59) and the tenth rack (last rack (rack 70)) engage just before driving in.
- the condition for stopping the motor is the vertical position M1 of the striking unit 12 as a control for stopping the striking unit 12 at the standby position. Therefore, when comparing the state in which the striking unit 12 is positioned at the standby position in normal times and when the first pin is broken, the striking unit 12 rotates one pin more when the first pin is broken. At this time, since the ninth rack (the second rack from the bottom 69) is shorter than the tenth rack (the final rack (rack 70)), when the first pin is broken, the final pin (pin 60) is separated from the ninth rack (the second rack from the bottom 69) at the standby position. As a result, the driver blade 29 is actually driven in before reaching the standby position. In other words, when the first pin is broken, a double strike occurs, in which two strikes are performed in one striking process.
- a threshold value is set for determining a first pin damage error when the blade detector switch 80a switches from OFF to ON to determine whether the first pin is broken.
- a Hall IC count of 1051 to 1460 is set as the threshold value for determining whether the first pin is broken. That is, when the blade detector switch 80a switches from OFF to ON to determine whether the first pin is broken, if the Hall IC count is in the range of 1051 to 1460, it is determined that a first pin is broken and braking of the electric motor 15 starts. At this time, no operation is performed to release the broken pin. Regardless of the detection of the blade detector switch 80a, if the Hall IC count exceeds 1460 while the electric motor 15 is operating, a release error occurs.
- the control unit 82 when the control unit 82 detects a misalignment in the engagement between the pin of the pinwheel 50 and the rack of the driver blade 29, the control unit 82 rotates the electric motor 15 in the reverse direction, causing the driver blade 29 to lower to the bottom dead center. This allows the misalignment between the pin and the rack to be released. After releasing the misalignment, the control unit 82 rotates the electric motor 15 in the forward direction to engage the first pin (pin 51) with the first rack (rack 61), thereby raising the striking unit 12 to the standby position. In this way, the occurrence of damage to the pin can be suppressed by releasing the misalignment under the control of the control unit 82.
- the frequency of part replacement in the driving machine 10 can be reduced, improving the convenience of the driving machine 10.
- control unit 82 determines whether or not the driver blade 29 is misaligned by judging the amount of rotation of the pinwheel 50 (the amount of rotation of the electric motor 15) based on the position of the driver blade 29 in the up-down direction M1 using the Hall IC count threshold value. In other words, because the misalignment is determined using a preset Hall IC count threshold value, the determination can be made quickly and with high accuracy.
- the amount of winding down of the reverse rotation of the electric motor 15 is calculated based on the Hall IC count value at the time when the blade detector switch 80a switches from OFF to ON (when the misalignment is determined), so that the amount of winding down that can be reliably released can be calculated with high accuracy.
- the worker When releasing the overhang, the worker operates the overhang release switch 81 on the operation unit 72 to start the overhang release operation. At that time, the worker presses the push lever 79 against the mating material 30 to turn it ON, and with the trigger 75 turned ON, further operates the overhang release switch 81 to start the overhang release operation.
- the driving machine (working machine) 210 shown in FIG. 18 is an air compression type working machine, and has a housing 211, an impact section 212, a nose section 213, a power supply section 214, an electric motor (motor) 215, a reduction mechanism 216, a winding mechanism 217, and a pressure accumulator vessel 218.
- the housing 211 is an outer shell element of the driving machine 210, and has a cylinder case 219, a handle 220, a motor case 221, and an attachment section 222.
- the cylinder case 219 is cylindrical, and the handle 220 and the motor case 221 are connected to the cylinder case 219.
- the attachment section 222 is connected to the handle 220 and the motor case 221.
- the power supply unit 214 can be attached to and detached from the mounting portion 222.
- the electric motor 215 is disposed in the motor case 221.
- the pressure accumulator vessel 218 has a cap 223 and a holder 224 to which the cap 223 is attached.
- a head cover 225 is attached to the cylinder case 219, and the pressure accumulator vessel 218 is disposed within both the cylinder case 219 and the head cover 225.
- a cylinder 227 is housed in the cylinder case 219.
- the cylinder 227 is made of metal, for example, aluminum or iron.
- the cylinder 227 is positioned relative to the cylinder case 219 in the direction along the center line A11 and in the radial direction.
- the center line A11 passes through the center of the cylinder 227.
- the radial direction is the radial direction of a virtual circle centered on the center line A11.
- a pressure chamber 226 is formed throughout the pressure accumulator container 218 and the cylinder 227.
- the pressure chamber 226 is filled with compressed gas.
- the compressed gas may be air or an inert gas. Examples of the inert gas include nitrogen gas and rare gas. In this embodiment 2, an example in which the pressure chamber 226 is filled with air will be described.
- the pressure chamber 226 is also a biasing portion that biases the striking portion 212 downward (one side) in the vertical direction (first direction).
- the striking portion 212 is disposed from the inside to the outside of the housing 211.
- the striking portion 212 has a piston 228 and a driver blade 229.
- the piston 228 is operable in a direction along the center line A11 within the cylinder 227.
- An annular seal member 284 is attached to the outer peripheral surface of the piston 228.
- the seal member 284 contacts the inner peripheral surface of the cylinder 227 to form a seal surface.
- the driver blade 229 is, for example, made of metal, non-ferrous metal, or steel.
- the piston 228 and the driver blade 229 are provided as separate members, and the piston 228 and the driver blade 229 are connected to each other.
- the striking portion 212 can strike the nail (fastener) 278 by moving downward (one side) in the vertical direction (first direction).
- the nose portion 213 is disposed inside and outside the cylinder case 219.
- the nose portion 213 has a bumper support portion 231, an injection portion 232, and a tube portion 233.
- the bumper support portion 231 is cylindrical.
- a bumper 235 is disposed within the bumper support portion 231.
- the bumper 235 may be made of either synthetic rubber or silicone rubber.
- the bumper 235 has a guide hole 236.
- the center line A11 passes through the guide hole 236.
- the driver blade 229 is disposed within the guide hole of the bumper support portion 231 and within the guide hole 236.
- the striking portion 212 can operate in a driving direction D11 and a return direction D12 along the center line A11.
- the driving direction D11 and the return direction D12 are opposite to each other.
- the driving direction D11 is the direction in which the piston 228 approaches the bumper 235.
- the return direction D12 is the direction in which the piston 228 moves away from the bumper 235.
- the striking portion 212 is constantly biased in the driving direction D11 by the gas pressure in the pressure chamber 226.
- the operation of the striking portion 212 in the driving direction D11 can be defined as descent.
- the operation of the striking portion 212 in the return direction D12 can be defined as ascent.
- the driving direction D11 is the same as the lower (one) side of the vertical direction (first direction).
- the return direction D12 is the same as the upper (other) side of the vertical direction (first direction).
- the ejection portion 232 is connected to the bumper support portion 231 and protrudes from the bumper support portion 231 in a direction along the center line A11.
- the ejection portion 232 has an ejection path 237 that is provided along the center line A11.
- the driver blade 229 can operate in the ejection path 237 in a direction along the center line A11.
- an electric motor 215 is disposed within the motor case 221.
- the electric motor 215 has a rotor 239 and a stator 240.
- the stator 240 is attached to the motor case 221.
- the rotor 239 is attached to a rotor shaft 241, and an end of the rotor shaft 241 is rotatably supported by the motor case 221 via a bearing 242.
- the electric motor 215 is a brushless motor, and when a voltage is applied to the electric motor 215, the rotor 239 rotates about the center line A12.
- a gear case 243 is provided within the motor case 221.
- the gear case 243 is cylindrical.
- a reduction mechanism 216 is provided within the gear case 243.
- the reduction mechanism 216 includes multiple planetary gear mechanisms.
- An input element of the reduction mechanism 216 is connected to the rotor shaft 241 via a power transmission shaft 244.
- the power transmission shaft 244 is rotatably supported by a bearing 245.
- a rotating shaft 246 is provided inside the cylindrical portion 233.
- the rotating shaft 246 is rotatably supported by bearings 248 and 249.
- the rotor shaft 241, the power transmission shaft 244, the reduction mechanism 216, and the rotating shaft 246 are arranged concentrically around the center line A12.
- the output element 247 of the reduction mechanism 216 and the rotating shaft 246 are arranged concentrically, and the output element 247 and the rotating shaft 246 rotate together.
- the reduction mechanism 216 is arranged in the power transmission path from the electric motor 215 to the rotating shaft 246.
- the winding mechanism 217 converts the rotational force of the rotating shaft 246 into a force that biases the striking portion 212 in the return direction D12.
- the driver 210 is also provided with a trigger 275 and a trigger sensor 285.
- the trigger 275 and the trigger sensor 285 are provided on the handle 220.
- the trigger sensor 285 detects whether or not an operating force is applied to the trigger 275, and outputs a signal according to the detection result.
- the power supply unit 214 has a housing case 276 and a battery housed within the housing case 276.
- the battery has a plurality of battery cells. These battery cells are secondary batteries that can be charged and discharged, and the battery cells can be any known battery cell, such as a lithium ion battery, a nickel metal hydride battery, a lithium ion polymer battery, or a nickel cadmium battery.
- the driving machine 210 is provided with a magazine 277.
- the magazine 277 is supported by the ejection section 232 and the mounting section 222. Nails (fasteners) 278 are stored in the magazine 277.
- the magazine 277 has a feeder that sends the nails 278 in the magazine 277 to the ejection path 237. That is, the feeder moves the nails 278 in the magazine 277 forward in the front-to-rear direction N11.
- the ejection section 232 is made of metal or synthetic resin.
- a push lever 279 is attached to the ejection section 232. The push lever 279 can operate within a predetermined range of directions along the center line A11 relative to the ejection section 232.
- An elastic member 280 is provided that biases the push lever 279 in a direction along the center line A11.
- the elastic member 280 is, for example, a metal spring, and biases the push lever 279 in a direction away from the bumper support portion 231.
- the push lever 279 comes into contact with a stopper 281 and stops.
- the control unit 282 is provided in the mounting unit 222, and mainly controls the driving of the electric motor 215.
- the control unit 282 has a microprocessor. As shown in FIG. 20, the microprocessor has a rotation speed calculation unit 290, a data storage unit 291, a current/rotation speed calculation program 292, a threshold setting unit 293, a misalignment determination unit 294, and a motor control unit 295. Also, as shown in FIG. 18, a motor board 283 is provided in the motor case 221.
- the motor board 283 is provided with an inverter circuit 310 shown in FIG. 19.
- the inverter circuit 310 connects and disconnects the stator 240 of the electric motor 215 and the power supply unit 214.
- the inverter circuit 310 includes multiple switching elements Q11, Q12, Q13, Q14, Q15, and Q16, each of which can be turned on and off.
- the control unit 282 controls the inverter circuit 310 via the drive signal output circuit 303 to control the rotation and stopping of the electric motor 215, or the rotation speed and rotation direction of the electric motor 215.
- the driving machine 210 also has a current detection circuit 300, a rotor position detection circuit 301, a display unit 302, a battery voltage detection circuit 304, a control power supply circuit 305, a control power supply voltage detection circuit 306, a pinwheel detection sensor 307, a push lever switch 308, and a trigger switch 309.
- the pinwheel detection sensor 307 detects the position of the pinwheel (rotating part) 250 shown in FIG. 18 in the rotation direction E11 (see FIG. 21 (a)) and outputs a signal.
- the push lever switch 308 turns ON and outputs a signal when the push lever 279 shown in FIG. 18 is pressed against the driven material 230.
- the trigger switch 309 outputs a signal when the trigger 275 shown in FIG.
- the rotor position detection circuit 301 detects the position of the rotor 239 in the rotation direction using the rotation position detection elements 301a, 301b, and 301c and outputs a signal.
- the control unit 282 processes the signal sent from the rotor position detection circuit 301 to detect the position of the striking part 212 in the direction of the center line A11.
- the signals output from the pinwheel detection sensor 307, the push lever switch 308, and the trigger switch 309 are input to the control unit 282.
- the control unit 282 processes each input signal and controls the inverter circuit 310. In this way, the control unit 282 controls the stopping, rotation, rotation direction, and rotation speed of the electric motor 215.
- the control unit 282 first stores the current data and the rotation speed data in the data storage unit 291 based on the signals of the current detection circuit 300 and the rotor position detection circuit 301. Next, the stored current data and the rotation speed data are input to the current/rotation speed calculation program 292.
- the current/rotation speed calculation program 292 calculates a calculation result that can be compared with the current calculation value and the rotation speed calculation value during normal lift-up (winding up the driver blade 229) using a predetermined calculation formula.
- the calculation result (current calculation value/rotation speed calculation value) calculated by the current/rotation speed calculation program 292 and the threshold value (current calculation value/rotation speed calculation value) set by the threshold setting unit 293 are judged by the mis-threading judgment unit 294. That is, the mis-threading judgment unit 294 judges whether the current data transmitted from the current detection circuit 300 and the rotation speed data transmitted from the rotor position detection circuit 301 are in a normal lift-up state or in an abnormal lift-up mis-threading state. The misalignment during lift-up will be explained in detail later.
- a stop control request signal is output, and a message indicating that work has stopped is displayed on the display unit 302. Furthermore, the stop control request signal is sent to the motor control unit 295, and a command is issued to stop the electric motor 215.
- the motor control unit 295 outputs a motor control signal in accordance with the received command, and performs control to stop the electric motor 215.
- the winding mechanism 217 includes a driver blade 229, a plurality of striking part side engagement parts provided on the driver blade 229, a pinwheel (rotating part) 250, and a plurality of rotating part side engagement parts provided on the pinwheel 250.
- the cross-sectional shape of the driver blade 229 is approximately rectangular.
- the driver blade 229 is provided with racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 as a plurality of striking part side engagement parts.
- racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 are provided integrally with the driver blade 229. Furthermore, the racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 are disposed between the tip 229a of the driver blade 229 in the direction along the center line A11 and the piston 228. The racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 are arranged in line in the vertical direction M11, and are disposed in this order in the direction along the center line A11. In the driving machine 210 of this embodiment 2, the racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 70 are protrusions provided on the edge of the driver blade 229.
- rack 261 is positioned at the front, i.e., first, in the return direction D12.
- racks 262, 263, 264, 265, 266, 267, 268, 269, and 270 are positioned behind rack 261.
- the pinwheel 250 is attached to the rotating shaft 246.
- the pinwheel 250 is a rotating part that rotates by the driving force of the electric motor 215.
- the pinwheel 250 is made of metal, non-ferrous metal, or steel, for example.
- the pinwheel 250 rotates about a center line A12.
- the center line A12 is disposed at a distance from the driver blade 229 in the left-right direction R11 in a direction that intersects with the operating direction of the striking part 212.
- the pinwheel 250 has multiple rotating part side engaging parts arranged side by side in the rotation direction E11.
- ten pins 251, 252, 253, 254, 255, 256, 257, 258, 259, 260 are provided on the pinwheel 250.
- the pins 251, 252, 253, 254, 255, 256, 257, 258, 259, 260 are provided separately from the pinwheel 250 and are fixed so as to protrude from the disk surface of the pinwheel 250.
- the pins 251, 252, 253, 254, 255, 256, 257, 258, 259, 260 are arranged on the same circumference centered on the center line A12.
- the pinwheel 250 also has a notch 250a formed in a second region of a predetermined angle in the rotation direction E11 of the pinwheel 250.
- the notch 250a is formed in a 90° region.
- the minimum outer diameter of the notch 250a centered on the center line A12 is smaller than the maximum outer diameter of the first region where the notch 250a is not formed.
- the first region where the notch 250a is not formed is a region of approximately 270° in the rotation direction E11 of the pinwheel 250.
- the pins 251, 252, 253, 254, 255, 256, 257, 258, 259, and 260 of the pinwheel 250 and the racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 of the driver blade 229 are arranged in overlapping positions along the center line A12, and are in a mutually engaging positional relationship.
- the pinwheel 250 rotates counterclockwise in FIG. 21(a) by the rotational force of the electric motor 215.
- the pin 251 is arranged in a second region in the rotation direction E11 of the pinwheel 250, and the pins 252, 253, 254, 255, 256, 257, 258, 259, and 260 are arranged in a first region in the rotation direction E11 of the pinwheel 250.
- the pins 252, 253, 254, 255, 256, 257, 258, 259, and 260 are arranged in this order along the rotation direction E11 of the pinwheel 250.
- the pin 251 is located at the front, i.e., the first position, in the rotation direction E11 during one rotation of the pinwheel 250.
- pins 252, 253, 254, 255, 256, 257, 258, 259, and 260 are located behind pin 251. Therefore, when the pinwheel 250 rotates with the striking portion 212 stopped, among the multiple pins, pin 251 is the first to approach the operating area of the driver blade 229 in the rotation direction E11 of the pinwheel 250.
- control unit 282 detects at least one of the following conditions: no operating force is being applied to the trigger 275, or the push lever 279 is not being pressed against the workpiece 230, the control unit 282 stops supplying power to the electric motor 215. As a result, the electric motor 215 stops, and the impact unit 212 stops in the standby position.
- control unit 282 When the control unit 282 detects that an operating force is being applied to the trigger 275 and that the push lever 279 is being pressed against the workpiece 230, it applies a voltage from the power supply unit 214 to the electric motor 215, causing the electric motor 215 to rotate in the forward direction. This starts the driving operation.
- the rotational force of the electric motor 215 is transmitted to the rotating shaft 246 via the reduction mechanism 216.
- the rotating shaft 246 and the pinwheel 250 rotate counterclockwise in FIG. 21(a), and the striking part 212 rises.
- the striking part 212 rises, the gas pressure in the pressure chamber 226 shown in FIG. 18 rises.
- the reduction mechanism 216 makes the rotational speed of the pinwheel 250 slower than the rotational speed of the electric motor 215.
- the impact portion 212 descends due to the gas pressure in the pressure chamber 226.
- the position of the impact portion 212 at the time when the pin 260 separates from the rack 270 is the top dead center.
- the driver blade 229 strikes one nail 278 located in the injection path 237, and the nail 278 is driven into the workpiece 230.
- the piston 228 collides with the bumper 235 (reaches bottom dead center) (step S51 in FIG. 22).
- the bumper 235 elastically deforms under the load in the direction along the center line A11, absorbing part of the kinetic energy of the striking portion 212.
- the control unit 282 continues to rotate the electric motor 215 even after the striking unit 212 has driven the nail 278 and reached the bottom dead center. As a result, the pinwheel 250 rotates counterclockwise as shown in FIG. 21(a), and the pin 251 approaches the rack 261.
- the driver blade 229 moves upward (to the other side) in the vertical direction M11 as the pinwheel 250 rotates with one of the multiple pins of the pinwheel 250 engaged with one of the multiple racks of the driver blade 229.
- the driver blade 229 is wound up in the return direction D12 as the pinwheel 250 rotates with the pin and rack engaged.
- the driver blade 229 moves downward (to one side) in the vertical direction M11 as the pin and rack are released from the engagement state. In other words, the driver blade 229 operates in the driving direction D11, thereby striking the nail 278.
- the pinwheel 250 rotates, causing the driver blade 229 to re-engage with one of the multiple pins and one of the multiple racks to return to the above-mentioned engagement state, thereby moving the driver blade 229 upward (to the other) side in the vertical direction M11.
- the control unit 282 judges whether the re-engagement is normal or abnormal based on the change in the rotation speed of the electric motor 215 or the change in the current value of the electric motor 215. At that time, the control unit 282 acquires tool data such as the current value or rotation speed (step S52), and then judges whether the acquired current value or rotation speed data is within the normal lift-up range (step S53). If it is determined that the re-engagement is abnormal (outside the normal lift-up range), the control content of the electric motor 215 is changed.
- step S54 the electric motor 215 is stopped before the engagement state is released.
- step S55 the display unit issues a warning as shown in step S55.
- step S53 if it is determined in step S53 that the acquired current value or rotation speed data is within the normal lift-up range, normal motor control is executed in step S56, and then, upon detection of the pinwheel switch (step S57), the motor is stopped in step S58.
- the control unit 282 detects that the striking unit 212 has reached the standby position, it stops the electric motor 215 and stops the rotation of the pinwheel 250.
- the pins 251, 252, 253, 254, 255, 256, 257, 258, 259, and 260 are arranged at equal intervals in the rotation direction E11 of the pinwheel 250.
- the racks 261, 262, 263, 264, 265, 266, 267, 268, 269, and 270 in the driver blade 229 are arranged at unequal intervals in the extension direction of the driver blade 229 (direction along the up-down direction M11). Note that most of the misalignment between the pins and the racks occurs between the first to third racks (racks 261 to 263) of the driver blade 229. Therefore, among the multiple racks of the driver blade 229, an unequal pitch portion is provided between one or more racks. Alternatively, an unequal pitch portion is provided between the first rack (rack 261) to the fourth rack (rack 264) of the driver blade 229.
- the driver blade 229 has a plurality of intermediate portions 271 provided between each of the plurality of racks, and one of the plurality of intermediate portions 271 includes a deformed intermediate portion 271a having a different shape from the other intermediate portions 271b.
- the distance between the plurality of racks arranged across the deformed intermediate portion 271a is different from the distance between the racks not arranged across the deformed intermediate portion 271a.
- the distance (pitch) P11 between the rack 261 and the rack 262 arranged on both sides of the deformed intermediate portion 271a is longer than the distance (pitch) P12 between the rack 262 and the rack 263 not arranged across the deformed intermediate portion 271a, or the distance (pitch) P12 between the rack 263 and the rack 264 (P11>P12).
- the rack pitches of the plurality of racks in the driver blade 229 are unequal. For example, P11 is 11.25 mm and P12 is 10.25 mm.
- the two racks arranged on both sides of the deformed intermediate portion 271a have different shapes.
- the shapes of the racks 261 and 262 arranged on both sides of the deformed intermediate portion 271a are different from each other.
- the rack shape J11 of the rack 261 is different from the rack shape J12 of the rack 262
- the curvature of the concave curved surface 261b provided on the lower surface of the rack 261 is larger than the curvature of the concave curved surface 262b provided on the lower surface of the rack 262.
- the concave curved surface 261b can be said to be a part of the rack 261 and a part of the deformed intermediate portion 271a
- the concave curved surface 262b can be said to be a part of the rack 262 and a part of the other intermediate portion 271b.
- the driver driver 210 sets a rack pitch that is longer or shorter than the distance between the pins of the pinwheel 250, thereby intentionally increasing or decreasing the load during lift-up (winding up the driver blade 229) compared to when the pitch is evenly spaced.
- the control unit 282 determines whether or not lift-up is being performed normally (whether or not a misalignment has occurred) based on the changes in the rotation speed waveform of the electric motor 215 or the current value waveform of the electric motor 215 during lift-up.
- Figure 23 shows the current waveform of the electric motor 215 versus time.
- Figure 23 is a schematic diagram of a case where a driver blade 229 with an equal pitch is used, without the uneven pitch portion as shown in Figure 4.
- the motor starts at time T11, and then the driver blade 229 reaches the bottom dead center at time T12.
- time T12 is also the point at which the engagement between the pin and the rack is released and the driver blade 229 is released.
- the pinwheel 250 is rotated by the drive of the electric motor 215, and the rotation of the pinwheel 250 starts lifting up the driver blade 229 at time T13.
- the range before and after the start of this lifting up is set as the judgment range L11, and it is judged whether the lifting up is performed normally (whether or not there is a misalignment).
- Time T15 is the end point of the judgment.
- the determination range L11 is the range from when the pin and rack are disengaged and the driver blade 229 is released until the pin and rack re-engage and move the driver blade 229 upward in the vertical direction M11.
- the end point of determination in the determination range L11 (time T15) is, for example, the point immediately after the third pin (pin 253 in FIG. 21(a)) engages with the third rack (rack 263 in FIG. 21(a)), and as an example, the point 0.150 seconds after the electric motor 215 starts to drive.
- Figure 24 shows the current waveforms of normal lift-up V11 and abnormal lift-up W11 in the judgment range L11 when the driver blade 229 with uneven rack pitch shown in Figure 21 (b) is used and engaged with the pinwheel 250 shown in Figure 21 (a). That is, the control unit 282 judges whether or not the pin and rack are misaligned based on the difference in the current waveforms of normal lift-up V11 and abnormal lift-up W11 shown in Figure 24. Specifically, the control unit 282 judges within the range from when the engagement state between the pin and rack is released and then when the pin and rack are re-engaged and the pinwheel 250 winds up the driver blade 229 upward in the vertical direction M11. That is, it judges within the judgment range L11.
- the control unit 282 judges that the re-engagement is abnormal if the current flowing through the electric motor 215 after the start of lift-up gradually increases, as in the current waveform of abnormal lift-up W11.
- the control unit 282 always detects the current change amount ⁇ I at a predetermined time ⁇ t, and if it detects ⁇ I/ ⁇ t ⁇ 0 (the value of the current change amount ⁇ I at the predetermined time ⁇ t is negative) in the period from time T13 to time T15, it judges that the re-engagement of the pin and the rack is normal. Conversely, if it does not detect ⁇ I/ ⁇ t ⁇ 0 (the value of the current change amount ⁇ I at the predetermined time ⁇ t is negative) in the period from time T13 to time T15, the control unit 282 judges that the re-engagement is abnormal.
- this judgment condition is only an example, and the threshold value of ⁇ I/ ⁇ t may be any value other than 0.
- the absolute value of the current may be used instead of the change amount of the current, and for example, a configuration may be used in which a configuration is ...
- the current value and rotation speed from time T12 to time T15 can be acquired, and estimation control can be performed using a neural network by machine learning the current and rotation speed waveforms during normal lift-up and the current and rotation speed waveforms during lift-up when the load is incorrect.
- control unit 282 detects an abnormality in the re-engagement of the pin and the rack, it controls the electric motor 215 to stop before the engagement state of the pin and the rack is released. In other words, the control unit 282 stops the electric motor 215 before the engagement state of the pin and the rack is released and the driver blade 229 is released.
- the control unit 282 stops the electric motor 215, so the driver blade 229 is not released and damage to the pin caused by a collision between the driver blade 229 and the final pin (e.g., pin 260) of the pinwheel 250 can be prevented. As a result, the durability of the driver 210 can be improved.
- the product can be provided at low cost.
- control unit 282 may detect an abnormality in the re-engagement of the pin and the rack and stop the electric motor 215, and then rotate the electric motor 215 in the direction opposite to the normal rotation direction for winding up the driver blade 229.
- the pinwheel 250 also rotates in the direction opposite to the normal rotation direction E11, and the driver blade 229 descends to the bottom dead center along with the rotation of the pinwheel 250.
- the speed at which the driver blade 229 descends is sufficiently lower than that during normal driving, the rebound of the driver blade 229 is suppressed, and the stop position of the driver blade 229 at the bottom dead center is stabilized.
- a normal driving operation may be performed (after the driver blade 229 passes the standby position and rises to the top dead point, it descends to the bottom dead point while striking the nail 278, and when it rises to the standby position again, the electric motor 215 may be stopped). Alternatively, the normal driving operation may not be performed, and the electric motor 215 may be stopped when the driver blade 229 rises to the standby position. Note that if the control unit 282 detects an abnormality, the electric motor 215 may be controlled to rotate in the reverse direction so that the driver blade 229 descends to the bottom dead point, and then automatically rotate in the forward direction, or may be automatically repeated in the reverse direction until the abnormality is resolved.
- FIG. 25 is a diagram showing a modified example of the second embodiment.
- the installation positions of the racks with different pitches in the driver blade 229 are set at positions different from those of the driver blade 229 in FIG. 21(b). That is, in the extension direction of the driver blade 229 (direction along the vertical direction M11), as shown in FIG. 25(b), an unequal pitch portion is provided between the first rack (rack 261) to the fourth rack (rack 264) of the driver blade 229.
- the distance (pitch) P12 between the rack 261 and the rack 262 arranged on both sides of the deformation intermediate portion 271a, and the distance (pitch P12) between the rack 263 and the rack 264 arranged on both sides of the deformation intermediate portion 271a are shorter than the distance (pitch P11) between the racks that are not arranged on either side of the deformation intermediate portion 271a (P11>P12).
- the pitch between the racks of the driver blade 229 is set to be unequal, similar to the driver blade 229 shown in FIG. 21(b).
- P11 is 10.25 mm
- P12 is 9.7 mm.
- the control unit 282 judges whether the pin and rack are misaligned due to the difference in the current value waveforms of normal lift-up V11 and abnormal lift-up W11 shown in FIG. 26.
- FIG. 26 shows the current value waveforms of normal lift-up V11 and abnormal lift-up W11 in the engagement state with the pinwheel 250 shown in FIG. 25(a) when a driver blade 229 with an uneven rack pitch shown in FIG. 25(b) is adopted.
- the control unit 282 judges whether the pin and rack are misaligned due to the difference in the current value waveforms of normal lift-up V11 and abnormal lift-up W11 shown in FIG. 26. Specifically, in the judgment range L11 in FIG. 23, the control unit 282 judges that the re-engagement of the pin and the rack is abnormal when the current flowing through the electric motor 215 after the start of lift-up gradually increases as shown in the current value waveform of abnormal lift-up W11 in FIG. 26. This shows a state in which the first pin is engaged with, for example, the third rack (rack 263) of the driver blade 229 shown in FIG. 25(b).
- the first pin does not enter between the first rack and the second rack at pitch P11, which is normal engagement, but enters, for example, between the third rack and the fourth rack at pitch P12 due to misalignment.
- the rack pitches from the fourth rack onwards are all pitch P11, so the current flowing through the electric motor 215 after the start of lift-up of the driver blade 229 gradually increases as shown in abnormal lift-up W11.
- the control unit 282 judges this state as abnormal re-engagement of the pin and the rack.
- control unit 282 when the control unit 282 detects an abnormality in the re-engagement of the pin and the rack, the control unit 282 controls the electric motor 215 to stop before the engagement state of the pin and the rack is released. In other words, the control unit 282 stops the electric motor 215 before the engagement state of the pin and the rack is released and the driver blade 229 is released.
- the specific judgment conditions of the control unit 282 may be the same as those in the second embodiment.
- the control unit 282 stops the electric motor 215, so the driver blade 229 is not released, and damage to the pin caused by a collision between the driver blade 229 and the final pin (e.g., pin 260) of the pinwheel 250 can be prevented.
- the durability of the driver 210 can be improved even with the modified driver blade 229.
- FIG. 27 is a block diagram of the control unit 282 of the work machine of embodiment 3.
- the change in the current value and the number of revolutions of the electric motor 215 due to the misalignment between the pin of the pinwheel 250 and the rack of the driver blade 229 is detected by artificial intelligence (AI).
- AI artificial intelligence
- the data of the current value and the number of revolutions of the electric motor 215 is machine-learned by artificial intelligence in advance, and the control unit 282 of the driving machine 210 detects the current value and the number of revolutions of the electric motor 215 based on the data (learning model) obtained by the machine learning, and judges whether or not the misalignment has occurred by comparing the detected value with the result of the machine learning.
- the control unit 282 performs estimation control of the misalignment judgment using a neural network (hereinafter also referred to as NN). That is, the misalignment judgment is performed by artificial intelligence with the pitch between the pins of the pinwheel 250 and the pitch between the racks of the driver blade 229 being equal pitches.
- Figure 28 shows the driver blade 229 with the pitch between each rack being equal pitches. That is, in the driver blade 229 shown in FIG. 28, the racks are arranged so that the pitch between each rack is equal.
- the machine learning itself is stored in the control unit 282 as learned data in advance in the driving machine 210. However, the learned model is data that is updated from time to time by machine learning when the driving machine 210 is used.
- the current/rotation speed calculation program 292 of the control unit 282 shown in FIG. 20 is replaced with a learned model (learned model) 96 and an NN calculation unit 297.
- the learned model 296 is data used when estimating the re-engagement state of the pin and the rack based on the change in the current value of the electric motor 215 or the change in the rotation speed of the electric motor 215.
- the NN calculation unit 297 is a calculation circuit that controls the drive of the electric motor 215 according to the re-engagement state of the pin and the rack estimated by the learned model 296.
- the control unit 282 detects that an operating force is applied to the trigger 275 and that the push lever 279 is pressed against the workpiece 230, it applies a voltage from the power supply unit 214 to the electric motor 215, causing the electric motor 215 to rotate forward. This starts the driving operation.
- the rotational force of the electric motor 215 is transmitted to the rotating shaft 246 via the reduction mechanism 216.
- the rotating shaft 246 and the pinwheel 250 rotate counterclockwise in FIG. 28, and the impact part 212 rises.
- the gas pressure in the pressure chamber 226 shown in FIG. 18 rises.
- the reduction mechanism 216 makes the rotational speed of the pinwheel 250 slower than the rotational speed of the electric motor 215.
- the impact portion 212 descends due to the gas pressure in the pressure chamber 226.
- the position of the impact portion 212 at the time when the pin 260 separates from the rack 270 is the top dead center.
- the driver blade 229 strikes one nail 278 located in the injection path 237, and the nail 278 is driven into the workpiece 230 (step S61 in FIG. 29).
- the control unit 282 judges whether the re-engagement is normal or abnormal based on the change in the rotation speed of the electric motor 215 or the change in the current value of the electric motor 215. At that time, the control unit 282 acquires tool data such as the current value or the rotation speed (step S62), and then calculates the acquired current value or the rotation speed data by executing an NN operation described later in step S63. The control unit 282 judges whether the above calculation result is within the range of normal lift-up (step S64). If it is determined that the re-engagement is abnormal (outside the range of normal lift-up), the control content of the electric motor 215 is changed.
- step S65 the electric motor 215 is stopped before the above-mentioned engagement state is released.
- step S66 the display unit warning shown in step S66 is executed.
- step S64 if it is determined in step S64 that the calculation result calculated by the NN operation using the acquired current value or rotation speed data is within the range of normal lift-up, normal motor control is executed in step S67, and then, upon detection of the pinwheel switch (step S68), the motor is stopped in step S69.
- the control unit 282 detects that the impact unit 212 has reached the standby position, it stops the electric motor 215 and stops the rotation of the pinwheel 250.
- the current data and the rotational speed data are stored in the data storage unit 291 based on the signals transmitted from the current detection circuit 300 and the rotor position detection circuit 301.
- the stored data is input to the NN calculation unit 297, a calculation result that can be compared with the current calculation value or the rotational speed calculation value during normal lift-up is calculated.
- the parameters handled by the NN calculation unit 297 use the learned model 296 formed in advance by machine learning as parameters.
- the misalignment determination unit 294 determines whether there is a difference compared to the threshold set by the threshold setting unit 293, that is, whether the clutch is misaligned. In other words, the misalignment determination unit 294 determines whether the current data transmitted from the current detection circuit 300 and the rotational speed data transmitted from the rotor position detection circuit 301 are in the normal lift-up state or the abnormal lift-up misaligned state.
- a stop control request signal is output, and a message indicating that work has stopped is displayed on the display unit 302. Furthermore, the stop control request signal is sent to the motor control unit 295, and a command is issued to stop the electric motor 215.
- the motor control unit 295 outputs a motor control signal in accordance with the received command, and performs control to stop the electric motor 215.
- the learning model is made up of data created based on the change in the current value of the electric motor 215 or the change in the rotation speed of the electric motor 215 during the period from when the pin of the pinwheel 250 and the rack of the driver blade 229 are disengaged from each other, until the pin and the rack are re-engaged to move the driver blade 229 upward in the vertical direction M11. Therefore, the determination of whether the pin and the rack are misaligned is performed using the learning model in the determination range L11 (see FIG. 23) before and after the driver blade 229 starts to lift up.
- Figure 30 shows the current waveforms of the electric motor 215 before and after the start of lifting up the driver blade 229 versus time, and shows the current waveforms for normal lift-up V11 and abnormal lift-up W11.
- the current value increases immediately after lift-up of the driver blade 229 begins at time T13, reaches a maximum at time T14, drops once, and then gradually increases toward time T15.
- the peak current value at time T14 is larger than that of normal lift-up V11.
- the current value at time T14 is the same as or slightly lower than that of normal lift-up V11
- the current value at time T15 is higher than that of normal lift-up V11.
- the magnitude of the current value changes depending on the engagement state of the first pin (pin 251 in FIG. 28) and the first rack (rack 261 in FIG. 28) at the start of lift-up, and differs between normal lift-up V11 and abnormal lift-ups W11 and W12.
- Figure 31 shows the rotational speed waveform of the electric motor 215 before and after the start of lifting up the driver blade 229 versus time, and shows the rotational speed waveforms of normal lift-up V11 and abnormal lift-up W11.
- the rotational speed peaks after time T14 and then gradually decreases.
- the rotational speed decreases once at time T14, immediately after the start of lifting up the driver blade 229 at time T13.
- FIG. 32 is a diagram showing the structure of an NN (neural network) in normal lift-up. There is a difference in the current value and rotation speed of the electric motor 215 between normal lift-up and abnormal lift-up when the hook is misaligned.
- a time series data of a predetermined number of samples of current value and rotation speed is used as input data 311, and the detection of normal lift-up is output data 312 to perform a misalignment judgment in abnormal lift-up.
- machine learning and actual calculation are performed using an NN with the structure shown in FIG. 32. At this time, the data used for machine learning is based on the data shown in FIG. 30 or FIG.
- multiple input data 311 are narrowed down to primary narrowed down data 313 by machine learning, and further narrowed down to secondary narrowed down data 314, and output data 312 for normal lift-up is calculated.
- the multiple input data 311 are narrowed down by machine learning based on the influence of factors, the level of relationship, and the like.
- the output data 312 for normal lift-up is calculated. Note that the number of times the multiple input data 311 is narrowed down is not limited to two, and may be three or more times.
- the control unit 282 stops the electric motor 215, so the driver blade 229 is not released. Therefore, it is possible to prevent damage to the pin due to a collision between the driver blade 229 and the last pin (e.g., pin 260) of the pinwheel 250. As a result, the durability of the driving machine 210 can be improved.
- the current value waveform and rotation speed waveform of the electric motor 215 depend on the environmental temperature and the pressure in the pressure chamber, etc., making it difficult to determine the misalignment by machine learning. However, in the misalignment determination in this embodiment 3, the current value waveform and rotation speed waveform are intentionally changed between normal and abnormal times, making it easy to perform the determination by machine learning.
- the product can be provided at low cost.
- the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.
- the cumulative information may be the cumulative value of the current flowing through the electric motor 15.
- the cumulative information may also be the driving time of the electric motor 15.
- a detectable element such as a magnet may be provided on the pinwheel 50
- a detection element such as a Hall sensor as a rotational position detection unit may be provided on the cylindrical portion 33, and the control unit 82 may directly detect the rotational position of the pinwheel 50 by detecting the position of the detectable element with the detection element.
- the striking portion position detection portion includes the blade detector switch 80a that engages with the rib 29c of the driver blade 29, but a detectable element such as a magnet may be provided on the driver blade 29, and a detection element such as a Hall sensor may be provided on the nose portion 13 as the striking portion position detection portion, and the position of the detectable element may be detected by the detection element, so that the control portion 82 detects the position of the driver blade 29 without coming into contact with the driver blade 29.
- the detection element may be a light-emitting element and a light-receiving element provided on the nose portion 13, and the detectable element may be a pinwheel 50 or a through hole provided in the driver blade 29.
- the control unit detects the rotational position of the pinwheel and the position of the driver blade to determine whether or not a misalignment has occurred, while based on the invention of embodiment 2, a misalignment determination may be made using current data and rotation speed data, and/or based on the invention of embodiment 3, a misalignment determination may be made based on machine learning. Also, some of the configurations of the respective embodiments may be interchanged. In this way, a work machine capable of more accurately determining a misalignment can be provided.
- pinwheel rotating portion
- 50a... notch 51, 52, 53, 54, 55, 56, 57, 58, 59, 60... pin (rotating portion side engagement portion), 61, 62, 63, 64, 65, 66, 67, 68, 69, 70... rack (striking portion side engagement portion), 72... operation portion, 75... trigger, 76... storage case, 77... magazine, 78... nail (fastener), 79... push lever, 80... striking portion position detection portion, 80a... blade detector switch (first switch), 80b... blade detector switch operation detection circuit, 81... mislatching release switch (second switch), 81a...
- driving direction D2... return direction, E1... rotation direction, M1... up-down direction (first direction), N1... front-back direction, Q1, Q2, Q3, Q4, Q5, Q6... switching elements, R1... left-right direction, T1, T2, T3, T4, T5, T6, T7, T11, T12, T13, T14, T15, T16, T17, T18, T19... time, 210... driving machine (work machine), 211... housing, 212... impact unit, 213... nose unit, 214... power supply unit, 215... electric motor (motor), 216... reduction mechanism, 217... winding mechanism, 218... pressure accumulator, 219...
- cylinder Case 220...handle, 221...motor case, 222...mounting portion, 223...cap, 224...holder, 225...head cover, 226...pressure chamber (energizing portion), 227...cylinder, 228...piston, 229...driver blade, 229a...tip, 230...workpiece, 231...bumper support portion, 232...ejection portion, 233...tubular portion, 235...bumper, 236...guide hole, 237...ejection path, 239...rotor, 240...stator, 241...rotor shaft, 242...bearing, 243...gear case, 244...power transmission shaft, 245...bearing, 246...rotating shaft, 247...output element, 248, 49...bearing, 250 ...Pinwheel (rotating part), 250a...Notch, 251,52,53,54,55,56,57,58,59,60...Pin (rotating part side engagement part), 261,62,63,64,65,66,67
- Trigger sensor 290...rotation speed calculation unit, 291...data storage unit, 292...current/rotation speed calculation program, 293...threshold setting unit, 294...missing engagement determination unit, 295...motor control unit, 296...trained model, 297...NN calculation unit (calculation unit), 300...current detection circuit, 301...rotor position detection circuit, 301a, 101b, 101c...rotation position detection element, 302...display unit, 303...drive signal output circuit, 304...battery voltage detection circuit, 305...control power supply circuit, 306...control power supply voltage detection circuit, 307...pinwheel detection sensor, 308...push lever switch, 309...trigger switch, 31 0... inverter circuit, 311... input data, 312...
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Abstract
Description
Claims (27)
- モータと、
第1方向の一方側へ移動することで止具を打撃可能な打撃部と、
前記打撃部を前記第1方向の一方側へ付勢する付勢部と、
前記モータの駆動力により回転し、前記打撃部に対して係合可能かつ係合を解除可能な回転部と、
前記モータの駆動を制御する制御部と、
を備え、
前記回転部は、該回転部の回転方向に並んで設けられる複数の回転部側係合部を有し、
前記打撃部は、前記第1方向に並んで設けられ、前記複数の回転部側係合部と係合可能な複数の打撃部側係合部を有し、
前記打撃部は、
前記複数の打撃部側係合部が前記複数の回転部側係合部と係合した状態で前記回転部が回転することで、前記第1方向の他方側へ移動し、
前記回転部との係合が解除されると、前記付勢部の付勢力によって前記第1方向の一方側へ移動することで前記止具を打撃する、打込み動作を行い、
前記制御部は、前記打込み動作において前記複数の打撃部側係合部と前記複数の回転部側係合部とが所定の係合関係にあるか否かを判別する、作業機。 - 前記制御部は、前記打込み動作が、前記複数の回転部側係合部の全てが前記複数の打撃部側係合部と係合する第1打込み動作と、前記複数の回転部側係合部の一部が前記複数の打撃部側係合部と係合しない第2打込み動作と、のいずれであるかを判別可能であり、前記打込み動作が前記第2打込み動作であるときに、前記複数の打撃部側係合部と前記複数の回転部側係合部とが前記所定の係合関係にないと判別する、請求項1に記載の作業機。
- 前記回転部の回転方向の位置である回転位置を検出する回転位置検出部と、
前記打撃部の前記第1方向の位置である打撃部位置を検出する打撃部位置検出部と、を備え、
前記制御部は、前記打込み動作が前記第1打込み動作と前記第2打込み動作とのいずれであるかを、前記回転位置と前記打撃部位置に基づいて判別する、請求項2に記載の作業機。 - 前記制御部は、前記打撃部位置が所定位置であるときに前記回転位置が所定範囲外にある場合に前記打込み動作が前記第2打込み動作であると判別する、請求項3に記載の作業機。
- 前記打撃部位置検出部は、前記打撃部位置が前記所定位置よりも前記第1方向の他方側に位置する際にオンとなる第1スイッチを含む、請求項4に記載の作業機。
- 前記第1スイッチは、前記打撃部位置が前記所定位置よりも前記第1方向の他方側に位置する際に前記打撃部と当接する、請求項5に記載の作業機。
- 前記打撃部は、前記打込み動作の実行中に待機位置に到達すると前記打込み動作を停止し、
前記打込み動作における前記待機位置は、前記所定位置よりも前記第1方向の他方側に位置する、請求項6に記載の作業機。 - 前記制御部は、前記打込み動作において前記モータが駆動する間に累積される前記モータの駆動に関する累積情報を有し、前記累積情報に基づいて前記回転位置を検出する、請求項3に記載の作業機。
- 前記累積情報は、前記モータの回転量である、請求項8に記載の作業機。
- 前記累積情報は、前記モータに流れた電流の累積値である、請求項8に記載の作業機。
- 前記累積情報は、前記モータの駆動時間である、請求項9に記載の作業機。
- 前記打撃部は、前記打込み動作の実行中に待機位置に到達すると前記打込み動作を停止し、
前記制御部は、前記打込み動作において前記打撃部が前記待機位置に到達する前に、前記打込み動作が前記第1打込み動作と前記第2打込み動作のいずれであるかを判別する、請求項2に記載の作業機。 - 前記制御部は、前記打込み動作が前記第2打込み動作であると判別すると、前記打撃部が下死点位置に到達するまで前記回転部を逆転させる、請求項12に記載の作業機。
- 前記モータの動作を前記モータの回転と前記モータの停止との何れかに切り替え可能なプッシュレバーと、
前記モータの動作を前記モータの回転と前記モータの停止との何れかに切り替え可能なトリガと、をさらに有し、
作業者が前記プッシュレバーを相手材に押し付け、かつ作業者が前記トリガを操作して前記モータの動作を回転に切り替えた状態で、作業者によって操作されることで前記回転部の逆転を開始させる第2スイッチを設けた、請求項13に記載の作業機。 - 前記制御部は、前記モータの回転数変化または前記モータの電流値変化に基づき、前記打撃部側係合部と前記回転部側係合部とが所定の係合関係にあるか否かを判別する、請求項1に記載の作業機。
- 前記打撃部は、前記複数の打撃部側係合部の各々の間に設けられる複数の中間部を有し、
前記複数の中間部のうちの何れかの前記中間部は、他の中間部と形状の異なる変形中間部を有する、請求項15に記載の作業機。 - 前記複数の打撃部側係合部のうち、前記変形中間部を挟んで配置される前記複数の打撃部側係合部の間の距離は、前記変形中間部を挟んで配置されてはいない前記複数の打撃部側係合部の間の距離と異なる、請求項16に記載の作業機。
- 前記複数の打撃部側係合部のうち、前記変形中間部を挟んで配置される前記複数の打撃部側係合部は、互いに形状が異なる、請求項17に記載の作業機。
- 前記制御部は、前記回転部が前記打撃部を前記第1方向の他方側へ移動させる間に前記モータを流れる電流が、徐々に増加する場合には前記打撃部側係合部と前記回転部側係合部とが所定の係合関係にないと判断し、前記電流が一時的に減少した後に増加した場合、または、一時的に増加した後に減少した場合には前記打撃部側係合部と前記回転部側係合部とが所定の係合関係にあると判断する、請求項16乃至18の何れか一項に記載の作業機。
- 前記制御部は、前記複数の打撃部側係合部と前記複数の回転部側係合部とが前記所定の係合関係にないと判別すると、前記打撃部の前記第1方向の他方側へ移動に伴い係合が解除される前に前記モータを停止させる、請求項1に記載の作業機。
- 前記制御部は、前記モータの電流値変化または前記モータの回転数変化に基づき前記複数の打撃部側係合部と前記複数の回転部側係合部との係合の状態を推定する学習モデルと、前記学習モデルによって推定された前記複数の打撃部側係合部と前記複数の回転部側係合部との係合の状態に応じて前記モータの駆動を制御する演算部と、を含む、請求項1に記載の作業機。
- 前記学習モデルは、前記複数の回転部側係合部と前記複数の打撃部側係合部との係合が解除されてから、再度係合が行われて前記打撃部を前記第1方向の他方側へ移動させる間の前記モータの電流値変化または前記モータの回転数変化に基づいて作られるデータからなる、請求項21に記載の作業機。
- モータと、
第1方向の一方側へ移動することで止具を打撃可能な打撃部と、
前記打撃部を前記第1方向の一方側へ付勢する付勢部と、
前記モータの駆動力により回転し、前記打撃部に対して係合可能かつ係合を解除可能な回転部と、
前記モータの駆動を制御する制御部と、
を備え、
前記回転部は、該回転部の回転方向に並んで設けられる複数の回転部側係合部を有し、
前記打撃部は、前記第1方向に並んで設けられ、前記複数の回転部側係合部と係合可能な複数の打撃部側係合部を有し、
前記打撃部は、
前記複数の打撃部側係合部が前記複数の回転部側係合部と係合した状態で前記回転部が回転することで前記第1方向の他方側へ移動し、
前記回転部との係合が解除されると、前記付勢部の付勢力によって前記第1方向の一方側へ移動することで前記止具を打撃する、打込み動作を行い、
前記打撃部は、前記複数の打撃部側係合部の各々の間に設けられる複数の中間部を有し、
前記複数の中間部のうちの何れかの前記中間部は、他の中間部と形状の異なる変形中間部を有する、作業機。 - 前記複数の打撃部側係合部のうち、前記変形中間部を挟んで配置される前記複数の打撃部側係合部の間の距離は、前記変形中間部を挟んで配置されてはいない前記複数の打撃部側係合部の間の距離と異なる、請求項23に記載の作業機。
- 前記複数の打撃部側係合部のうち、前記変形中間部を挟んで配置される前記複数の打撃部側係合部は、互いに形状が異なる、請求項24に記載の作業機。
- モータと、
第1方向の一方側へ移動することで止具を打撃可能な打撃部と、
前記打撃部を前記第1方向の一方側へ付勢する付勢部と、
前記モータの駆動力により回転し、前記打撃部に対して係合可能かつ係合を解除可能な回転部と、
前記モータの駆動を制御する制御部と、
を備え、
前記回転部は、該回転部の回転方向に並んで設けられる複数の回転部側係合部を有し、
前記打撃部は、前記第1方向に並んで設けられ、前記複数の回転部側係合部と係合可能な複数の打撃部側係合部を有し、
前記打撃部は、
前記複数の打撃部側係合部が前記複数の回転部側係合部と係合した状態で前記回転部が回転することで前記第1方向の他方側へ移動し、
前記回転部との係合が解除されると、前記付勢部の付勢力によって前記第1方向の一方側へ移動することで前記止具を打撃する、打込み動作を行い、
前記制御部は、前記モータの電流値変化または前記モータの回転数変化に基づき前記複数の打撃部側係合部と前記複数の回転部側係合部との係合の状態を推定する学習モデルと、前記学習モデルによって推定された前記複数の打撃部側係合部と前記複数の回転部側係合部との係合の状態に応じて前記モータの駆動を制御する演算部と、を含む、作業機。 - 前記学習モデルは、前記複数の回転部側係合部と前記複数の打撃部側係合部との係合が解除されてから、再度係合が行われて前記打撃部を前記第1方向の他方側へ移動させる間の前記モータの電流値変化または前記モータの回転数変化に基づいて作られるデータからなる、請求項26に記載の作業機。
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|---|---|---|---|---|
| WO2018180082A1 (ja) | 2017-03-29 | 2018-10-04 | 工機ホールディングス株式会社 | 打込機 |
| JP2021154470A (ja) * | 2020-03-30 | 2021-10-07 | 工機ホールディングス株式会社 | 打込機 |
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| WO2018180082A1 (ja) | 2017-03-29 | 2018-10-04 | 工機ホールディングス株式会社 | 打込機 |
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| US20240139922A1 (en) * | 2021-03-31 | 2024-05-02 | Koki Holdings Co., Ltd. | Working machine |
| US12194606B2 (en) * | 2021-03-31 | 2025-01-14 | Koki Holdings Co., Ltd. | Working machine |
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