TWI843440B - Electric cutting machine with quick-change guard assembly - Google Patents

Abstract

An electric cutting machine with a quick-change shield assembly is provided. A motor is arranged in a motor seat of an outer shell of the electric cutting machine. The motor has a drive shaft that penetrates outward and is used to combine with a tool. A rotatable tool shield is axially combined with a side of the outer shell corresponding to the drive shaft, and a magnetic induction element is arranged on the side. The magnetic induction element senses the presence or absence of a magnet so that the motor drives the tool to rotate in different directions. A quick-change shield assembly is detachably combined with the outside of the tool shield. At least one magnet is arranged on the quick-change shield assembly, and the magnet is located within the sensing range of the magnetic induction element. In this way, when the quick-change shield assembly is installed, the electric cutting machine can automatically switch the rotation direction of the tool, and there is no need to use other switches such as steering buttons to switch the tool rotation, which is convenient for users.

Description

Electric cutting machine with quick-change guard assembly

The invention relates to an electric tool device; in particular to an electric cutting machine with a quick-change shield assembly and capable of automatically controlling the forward and reverse rotation of a tool.

The existing electric cutting machine has a steering button to control the direction of the tool rotation. When the electric cutting machine is not equipped with a quick-change shield assembly, the steering button is switched to an operation mode that causes the tool to rotate in the forward direction. When the quick-change shield assembly is installed on the electric cutting machine, the steering button is switched to a reverse rotation mode so that the debris generated by the tool cutting can be ejected upward, allowing the exhaust pipe of the quick-change shield assembly to smoothly collect the debris.

Although the electric cutting machine is provided with a steering button switch, allowing the user to select the appropriate rotation direction of the tool so that the chip removal function of the quick-change shield assembly can be brought into play, since the steering button always requires manual operation, if the steering button is switched to a forward rotation state when the electric cutting machine is installed with the quick-change shield assembly, the quick-change shield assembly cannot play the chip removal function. Each time the user uses it, he must pay attention to whether the steering button is switched to the appropriate steering mode, causing trouble to the user.

In view of this, the purpose of the present invention is to provide a cutting machine device that enables the electric cutting machine to determine whether a quick-change guard assembly is installed on the tool guard. If so, the tool is driven to rotate in the direction opposite to the direction when the quick-change guard assembly is not installed, so that the direction of tool rotation can be changed according to whether the quick-change guard assembly is installed, and there is no need to set a switch such as a steering button on the electric cutting machine to control the direction of the tool.

In order to achieve the above object, the present invention provides an electric cutting machine with a quick-change shield assembly, including an electric cutting machine and a quick-change shield assembly detachably combined with the electric cutting machine. The electric cutting machine has a motor seat, a motor is transversely arranged in the motor seat, the motor has a drive shaft, the drive shaft pivots through one side of the motor seat, the motor seat has an assembly side wall at the pivot of the drive shaft, a tool is fixed on the drive shaft sleeve, a tool shield is axially combined with the assembly side wall, the tool shield shields the tool and rotates around the drive shaft, a magnetic induction element is arranged around the assembly side wall, and the magnetic induction element senses the presence or absence of a magnet so that the motor drives the tool to rotate in different directions when it is started. The quick-change shield assembly has an outer shield and a support seat coupled to the bottom of the outer shield. One side of the outer shield has a sleeve opening, which is used to cover the tool shield so that the tool shield can be detachably coupled to its interior. The support seat has a tool opening in the middle, and part of the tool extends downward from the tool opening. At least one magnet is arranged on the part of the outer shield located around the sleeve opening, and at least one magnet is located within the sensing range of the magnetic induction element.

The effect of the present invention is that the motor can drive the tool to rotate in different directions when the motor is started by sensing the presence or absence of a magnet. For example, when the quick-change shield assembly is installed on the tool shield of an electric cutting machine, if the magnetic induction element of the electric cutting machine senses the magnet, the electric cutting machine will be operated in a mode of driving the tool to rotate in reverse, so that the quick-change shield assembly can play a role in removing cutting debris. On the contrary, when the quick-change shield assembly is removed from the electric cutting machine, the electric cutting machine will change to an operation mode of driving the tool to rotate forward, so that the tool of the electric cutting machine can change its direction without manual switching, which is convenient for users.

In order to more clearly explain the present invention, a preferred embodiment is given and described in detail with reference to the drawings. Please refer to FIG1 , which is an electric cutting machine 100 with a quick-change shield assembly according to a preferred embodiment of the present invention, comprising an electric cutting machine 10 and a quick-change shield assembly 20 detachably coupled to the electric cutting machine 10, wherein:

2 to 5, the electric cutting machine 10 has a housing 12, the housing 12 includes a handle 121 and a motor seat 122 connected to the front end of the handle 121, a trigger 123 is disposed at the front end of the bottom of the handle 121, a motor 14 is disposed transversely in the motor seat 122, the trigger 123 is pressed to start the motor 14, the motor 14 has a drive shaft 141, the drive shaft 141 pivots through one side of the motor seat 122, the motor seat 122 is supported by the trigger 123, and the motor 14 is driven by the trigger 123. The drive shaft 141 has an assembly side wall 124 at its pivot point. A tool 142 is fixedly mounted on the drive shaft 141. A tool shield 16 is axially coupled to the assembly side wall 124. The tool shield 16 shields the top side of the tool 142 and can rotate around the drive shaft 141. A magnetic sensing element 18 is arranged around the assembly side wall 124. The magnetic sensing element 18 senses the presence or absence of a magnet, so that the motor 14 drives the tool 142 to rotate in different directions when it is started.

Please refer to FIG. 3 and FIG. 5 to FIG. 9 , the quick-change shield assembly 20 has an outer shield 22 and a support seat 24 coupled to the bottom of the outer shield 22. The outer shield 22 has a sleeve 221 on one side, and the sleeve 221 is sleeved onto the tool shield 16, so that the tool shield 16 is detachably coupled to the inner part of the outer shield 22, so that the outer shield 22 is coupled to the tool shield 16 in an overlapping state. The support seat 24 has a tool opening 241 in the middle, and a portion of the tool 142 extends downward from the tool opening 241.

At least one magnet 26 is disposed at the portion of the outer shield 22 located around the sleeve opening 221. Specifically, in the preferred embodiment, four magnets 26 are disposed at the portion of the outer shield 22 located around the sleeve opening 221, and the magnets 26 are cylindrical magnetic blocks. The magnets 26 are arranged in an arc shape and are equidistant from the axis of the drive shaft 141, and one of the magnets 26 is directly opposite to the magnetic induction element 18, so that at least one magnet 26 is located within the sensing range of the magnetic induction element 18. In this way, as long as the quick-change shield assembly 20 is detachably coupled to the tool shield 16, the motor 14 of the electric cutting machine 10 will drive the tool 142 to rotate in the opposite direction when it is started. Conversely, when the quick-change shield assembly 20 is removed from the tool shield 16, the magnetic sensing element 18 no longer senses the magnetic force of any magnet 26, and starting the motor 14 at this time will drive the tool 142 to rotate in a forward direction.

In other preferred embodiments, two or three or more magnets 26 may be provided around the sleeve opening 221 of the quick-change shield assembly 20, and the magnets 26 may be a plurality of cylindrical magnets equidistant from the axis of the drive shaft 141, or a circular arc-shaped magnetic block may be used as the magnet 26 to replace the plurality of magnets 26 detected by the magnetic sensing element 18. When the quick-change shield assembly 20 and the tool shield 16 rotate back and forth relative to the housing 12 around the axis of the drive shaft 141, the arc-shaped magnet 26 can be located at a position where the magnetic sensing element 18 can detect the magnetic force, so that the motor 14 drives the tool 142 to rotate in the opposite direction when it is started. The shape of the magnet 26 can be changed in quantity and shape as required.

When the electric cutting machine 10 of the present invention is used, please refer to Figures 2 to 5. The user holds the handle 121 of the electric cutting machine 10 and presses the trigger 123 with a finger to start the motor 14 to drive the drive shaft 141 to drive the tool 142 to rotate. At this time, the tool 142 of the electric cutting machine 10 rotates in the forward direction. The debris generated by the workpiece cut by the tool 142 will be ejected downward from the front side of the tool 142. The tool guard 16 blocks the upper side of the tool 142 to prevent the user from accidentally touching the tool 142 from above, thereby achieving the effect of protecting the user.

Please refer to Figures 6 to 9. After the quick-change shield assembly 20 is installed on the tool shield 16, since at least one magnet 26 of the quick-change shield assembly 20 will be located within the sensing range of the magnetic sensing element 18, when the user presses the trigger 123 with a finger to start the motor 14 to drive the tool 142 to rotate with the drive shaft 141, the motor 14 will drive the tool 142 to rotate in the opposite direction. At this time, the debris generated by the workpiece cut by the tool 142 will be ejected upward at the front side of the tool 142. Such a configuration enables the quick-change shield assembly 20 to have an exhaust pipe 28 for collecting debris on the front side, so that the quick-change shield assembly 20 can smoothly collect cutting debris. Since the judgment mechanism for making the motor 14 drive the tool 142 to rotate forward or reverse in different directions is based on whether the magnetic induction element 18 detects the magnetic field of any magnet 26, which is equivalent to judging whether the quick-change shield assembly 20 is installed on the tool shield 16, there is no need to set a switch such as a steering button on the electric cutting machine 10 to switch the direction of the tool 142. That is, by installing the quick-change shield assembly 20, the rotation direction of the tool 142 of the electric cutting machine 10 can be switched to a different rotation direction, so that the electric cutting machine 10 automatically changes to the use state of driving the tool 142 to rotate in reverse due to the installation of the quick-change shield assembly 20.

In addition, due to the design of the present invention, at least one magnet 26 of the quick-change shield assembly 20 is located within the sensing range of the magnetic induction element 18. When the support seat 24 is used to flatly adhere to the surface of the workpiece and the part of the tool 142 that extends downward from the tool opening 241 is used to cut the workpiece, since the quick-change shield assembly 20 is combined with the tool shield 16, and the tool shield 16 is axially combined with the assembly side wall 124 and can rotate, the user can change the angle of holding the handle 121 with bare hands by raising or lowering the position of the handle 121. During the process, any magnet 26 is designed to be within the detection range of the magnetic induction element 18, so that when the user adjusts the angle of the handle 121 within a reasonably expected range, the tool 142 of the electric cutting machine 10 can remain in a state of reverse rotation driven by the motor 14.

Please refer to Figures 3 to 5 for the following description of the other structures of the preferred embodiment of the present invention. The assembly side wall 124 of the housing 12 is provided with a disc 125 protruding along the axial direction of the drive shaft 141 , and the drive shaft 141 pivots through the center of the disc 125 . The tool guard 16 has a pivot plate 161 and a tool cover 162 connected to the pivot plate 161. The pivot plate 161 has a disc hole 163. The tool guard 16 is rotatable by fitting the disc hole 163 around the disc 125. A fixing ring 126 is detachably coupled to the outer end surface of the disc 125 by means of a screw. The fixing ring 126 is concentric with the disc 125 and the outer periphery of the fixing ring 126 protrudes from the disc 125, thereby fixing the tool guard 16 by the fixing ring 126 to prevent the tool guard 16 from falling off the disc 125.

The pivot plate 161 of the tool guard 16 has a plurality of positioning grooves 164 arranged in an arc shape. In the preferred embodiment, the number of the positioning grooves 164 is set to four, corresponding to the number of the magnets 26. The positioning grooves 164 are equidistant from the center of the disc hole 163, that is, the positioning grooves 164 are equidistant from the axis of the drive shaft 141. Please refer to Figures 2 and 9. The angle θ1 of the magnets 26 with the drive shaft 141 as the center is equal to the angle θ2 of the positioning grooves 164 with the center of the disc hole 163 as the center. A button hole 127 is provided on the assembly side wall 124 to match the positions of the positioning grooves 164, and an elastically protruding positioning button 1271 is inserted into the button hole 127. The outer end of the positioning button 1271 is embedded in one of the positioning grooves 164, thereby positioning the tool guard 16 at an adjustable position relative to the handle 121 and the motor seat 122 when rotating. When the outer end of the positioning button 1271 is embedded in one of the positioning grooves 164, the magnetic sensing element 18 is facing one of the magnets 26, so that the magnetic sensing element 18 can sense the magnetic field of the corresponding magnet 26 during the rotation of the quick-change guard assembly 20 relative to the electric cutting machine 10, so that the electric cutting machine 10 remains in a state of driving the tool 142 to rotate in the opposite direction.

Please refer to Figures 3, 4, 6 and 7. The top side of the assembly side wall 124 is retracted inward to form a sensing portion 128. A shoulder 129 is formed between the bottom edge of the sensing portion 128 and the top edge of the remaining portion of the assembly side wall 124. The shoulder 129 is an arc-shaped surface extending in the front-rear direction with the axis of the drive shaft 141 as the center. In the preferred embodiment, the magnetic induction element 18 is arranged on the inner side of the sensing portion 128. In order to match the arc shape of the shoulder 129, the sleeve 221 of the outer shield 22 is set to an inverted U-shaped opening, so that the top side of the sleeve 221 forms an arc periphery 222, and the front and rear sides of the inner wall of the outer shield 22 are respectively provided with a fixed buckle 223 and a movable buckle 224. The contour of the inner top side of the outer shield 22 matches the shape of the tool shield 16.

Please refer to Figures 6 and 9. When the outer shield 22 is combined with the tool shield 16 in an overlapping manner, the fixed buckle 223 and the movable buckle 224 are respectively buckled on the bottom of the front and rear ends of the tool cover 162, so that the tool cover 162 is fixed against the peripheral wall of the top inner side of the outer shield 22. At the same time, the outer shield 22 is buckled on the shoulder 129 with the circular arc periphery 222. The magnets 26 are arranged at the position of the circular arc periphery 222, and one of the magnets 26 is opposite to the magnetic sensing element 18. The outer shield 22 of the quick-change shield assembly 20 is connected to an upwardly extending exhaust pipe 28 at the bottom of its front end. The exhaust pipe 28 is communicated with the interior of the outer shield 22 and is used to collect the processing debris that is cut by the tool 142 and ejected upward from the front side of the tool 142 when the tool 142 rotates in the reverse direction. The support seat 24 is a rectangular plate and the front end is pivotally connected to the connection between the exhaust pipe 28 and the outer shield 22.

A screw 21 is provided on the rear side of the outer shield 22 and passes through the outer shield 22 backward. An arc-shaped bracket 242 extends upward from the rear end of the top of the support seat 24. A long groove 243 is provided in the middle of the arc-shaped bracket 242. The screw 21 passes through the long groove 243. A knob 211 is screwed on the rear end of the screw 21. The knob 211 presses the arc-shaped bracket 242 forward to press against the rear of the outer shield 22 and fix the support seat 24 whose front end is pivoted at the connection between the exhaust pipe 28 and the outer shield 22, so that the support seat 24 is combined with the bottom of the outer shield 22 in a manner that can change the angle, so that the tool 142 extends out of the tool opening 241 of the support seat 24 at different depths.

The above description is only the preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the scope of patent application should be included in the patent scope of the present invention.

[The present invention] 100: Electric cutting machine with quick-change guard assembly 10: Electric cutting machine 12: Housing 121: Grip 122: Motor seat 123: Trigger 124: Assembly side wall 125: Disc 126: Fixed ring 127: Button hole 1271: Positioning knob 128: Sensing part 129: Shoulder 14: Motor 141: Drive shaft 142: Tool 16: Tool guard 161: Hub plate 162: Tool cover 163: Disc hole 164: Positioning groove 18: Magnetic induction element 20: Quick-change guard assembly 21: Screw 211: Knob 22: Outer shield 221: Sleeve 222: Arc periphery 223: Fixed buckle 224: Movable buckle 24: Support seat 241: Tool opening 242: Arc bracket 243: Long slot 26: Magnet 28: Exhaust pipe θ1, θ2: Angle

Figure 1 is a three-dimensional diagram of a preferred embodiment of the present invention. Figure 2 is a three-dimensional diagram of the electric cutting machine of the preferred embodiment of the present invention. Figure 3 is an exploded view of the electric cutting machine of the preferred embodiment of the present invention with the tool shield separated. Figure 4 is an exploded view of Figure 3 from another angle. Figure 5 is a side view of Figure 3. Figure 6 is an exploded view of the quick-change shield assembly of the preferred embodiment of the present invention. Figure 7 is an exploded view of Figure 6 from another angle. Figure 8 is a top view of Figure 1. Figure 9 is a cross-sectional view of Figure 8 taken along the 9-9 direction.

100: Electric cutting machine with quick-change guard assembly

10: Electric cutting machine

12: Shell

16: Tool guard

20: Quick-change guard set

22: Outer shield

221: Socket

222: Arc circumference

24: Support seat

26: Magnet

Claims (4)

An electric cutting machine with a quick-change shield assembly comprises: an electric cutting machine, a motor seat, a motor is transversely arranged in the motor seat, the motor has a drive shaft, the drive shaft pivots through one side of the motor seat, the motor seat has an assembly side wall at the pivot of the drive shaft, a tool is fixed on the drive shaft sleeve, a tool shield is axially combined with the assembly side wall, the tool shield shields the tool and rotates around the drive shaft, a magnetic induction element is arranged around the assembly side wall, and the magnetic induction element senses magnetic field. The presence or absence of the body causes the motor to drive the tool to rotate in different directions when it is activated; and a quick-change shield assembly, comprising an outer shield and a support seat coupled to the bottom of the outer shield, one side of the outer shield having a sleeve opening, the sleeve opening is sleeved onto the tool shield, and the tool shield is detachably coupled to the inside thereof, the middle of the support seat has a tool opening, a portion of the tool extends downwardly out of the tool opening, at least one magnet is disposed on the portion of the outer shield located around the sleeve opening, and at least one magnet is located within the sensing range of the magnetic induction element; The assembly side wall is provided with a disc protruding axially, the drive shaft pivots through the center of the disc, the tool guard has a pivot plate and a tool cover connected to the pivot plate, the pivot plate has a disc hole, the tool guard is rotatable by fitting the disc hole around the disc, a fixed ring concentric with the disc is combined on the outer end surface of the disc, the outer periphery of the fixed ring protrudes from the disc to fix the tool guard; the pivot plate has a plurality of positioning grooves arranged in an arc shape, and the positioning grooves are 1/4 of the distance from the disc hole to the center of the disc hole. The locating grooves are equidistant from the center of the drive shaft; a convex button hole is provided on the assembly side wall to match the position of the locating grooves, and an elastically protruding locating button is inserted into the convex button hole. The outer end of the locating button is embedded in one of the locating grooves. A plurality of magnets are provided on the portion of the outer shield located around the sleeve opening. The magnets are arranged in an arc shape and are equidistant from the axis of the drive shaft. The angle of the interval between the magnets with the drive shaft as the center is equal to the angle of the interval between the locating grooves with the center of the disc sleeve hole as the center; the magnetic induction element is directly opposite to one of the magnets. An electric cutting machine with a quick-change shield assembly as described in claim 1, wherein the electric cutting machine has an outer shell, the outer shell has a handle, the front end of the handle is connected to the middle of the rear side of the motor seat, and a trigger is provided at the bottom front end of the handle, and the motor is started when the trigger is pressed. An electric cutting machine with a quick-change shield assembly comprises: an electric cutting machine, a motor seat, a motor is transversely arranged in the motor seat, the motor has a drive shaft, the drive shaft pivots through one side of the motor seat, the motor seat has an assembly side wall at the pivot of the drive shaft, a tool is fixed on the drive shaft sleeve, and a tool shield is axially combined with the assembly side wall, the tool shield shields the tool The tool shroud is provided with a magnetic induction element around the side wall of the assembly, and the tool shroud is driven to rotate in different directions when the motor is activated by sensing the presence or absence of the magnet by the magnetic induction element; and a quick-change shield assembly having an outer shield and a support seat coupled to the bottom of the outer shield, and a sleeve opening on one side of the outer shield, and the sleeve opening is sleeved onto the tool shroud, so that the tool shroud can be The support base is detachably coupled to the inner part thereof, a tool opening is provided in the middle of the support base, a portion of the tool opening extends downwardly out of the tool opening, at least one magnet is provided in the portion of the outer shield located around the sleeve opening, and at least one magnet is located within the sensing range of the magnetic induction element; wherein the top side of the assembly side wall is retracted inwardly to form a sensing portion, and a shoulder is formed between the bottom edge of the sensing portion and the top edge of the remaining portion of the assembly side wall The shoulder is an arc-shaped surface extending in the front-rear direction with the axis of the drive shaft as the center, and the magnetic induction element is arranged on the inner side of the sensing part; the sleeve of the outer shield is an inverted U-shaped opening, and the top side of the sleeve periphery forms an arc periphery. The outer shield is buckled on the shoulder with the arc periphery, and a plurality of the magnets are arranged on the arc periphery, and the magnetic induction element faces one of the magnets. As described in claim 3, an electric cutting machine with a quick-change shield assembly, wherein the bottom of the front end of the outer shield is connected to an exhaust pipe, and the exhaust pipe is connected to the inside of the outer shield; the support seat is a rectangular plate and the front end is pivoted to the bottom of the connection between the exhaust pipe and the outer shield, and a screw rod is provided on the rear side of the outer shield to pass through the outer shield backwards, and an arc-shaped bracket extends upward from the rear end of the top of the support seat, and the middle of the arc-shaped bracket has a long groove, the screw rod passes through the long groove, and a knob is provided to screw on the screw rod and press the arc-shaped bracket to be fixed to the back of the outer shield, so that the support seat is combined with the bottom of the outer shield in a way that can change the angle, so that the tool extends out of the tool mouth at different depths.

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