JP4869872B2 - Driving depth adjusting device for driving machine - Google Patents

Description

  The present invention relates to an apparatus for adjusting a driving depth of a driving tool in a driving machine such as a compressed air type nailing machine.

For example, the compressed air type driving machine 50 shown in FIG. 5 includes a main body 51 having a striking piston 52 therein, and a trigger switch lever 54 is provided at the base of the handle 53. By pulling the switch lever 54 with a fingertip, compressed air is supplied to and exhausted from a cylinder accommodated in the main body 51 to reciprocate the striking piston 52 in the driving direction, whereby the driver 55 provided integrally with the striking piston 52 The tip can be driven into the head of the driving tool and the driving tool can be driven into the target. A cylindrical driver guide 56 to which the driver 55 is reciprocated and a driving tool is supplied one by one is provided at the tip (lower end surface in the drawing) of the main body 51 so as to protrude downward.
In general, this type of driving machine 50 is provided with a mechanism for preventing the inadvertent driving operation. The malfunction prevention mechanism 60 is provided so that the contact arm 61 can be moved along the driver guide 56 and its tip is urged in a direction protruding from the tip of the driver guide 56 (a launching port of the driving tool). The rear end side of the arm 61 or the rear end side of another member supported on the rear end side is extended to the vicinity of the switch lever 54, and the switch lever 54 is turned on only when the rear end side is located at the on position. The operation is possible or the operation is valid. According to this malfunction prevention mechanism 60, the user grips the handle portion 53 and presses the tip end portion of the driver guide 56 against the material to be driven, thereby retracting the contact arm 61 by its urging force and turning on the rear end side. Only when the switch lever 54 is moved to the position, the ON operation of the switch lever 54 becomes effective, and the driving operation can be performed.
Furthermore, this type of driving machine 50 is provided with a mechanism for adjusting the driving depth of the driving tool with respect to the driven material. In many cases, the driving depth adjusting device 70 changes the relative movement distance of the contact arm 61 with respect to the driver guide 56 so that the driver guide 56 at the tip of the contact arm 61 is pressed against the driven material. By adjusting the projecting dimension from the tip, the lower end position of the driver 55 relative to the driven material is adjusted to adjust the driving depth of the driving tool.

Details of a conventional general driving depth adjusting device 70 are shown in FIG. In this conventional driving depth adjusting device 70, an operating member 75 is provided on the rear end portion 61a of the contact arm 61 so as to be relatively movable in the vertical direction in the figure, and the height of the operating member 75 in the moving direction of the operating member 75 is set on the operating member 75. A cam member 71 having a cam surface that changes stepwise, and an adjustment dial 73 for rotation operation provided integrally therewith are supported so as to be relatively rotatable, and the operating member 75 is supported on the cam surface of the cam member 71. A structure in which the engaging portion 72 provided integrally is abutted and engaged in the axial direction, and the cam surface with which the engaging portion 72 is engaged is changed by the rotation operation of the adjustment dial 73 to the contact arm 61. The length of the actuating member 75 (the length projecting rearward from the rear end portion 61 a) is changed, thereby changing the projecting dimension of the contact arm 61 with respect to the tip end portion of the driver guide 56. And it has a configuration to adjust the driving depth by.
By pressing the driving machine main body 51, the contact arm 61 is moved backward relative to the driver guide 56, whereby the operating member 75 is integrally moved to the ON position, so that the ON operation of the switch lever 54 becomes effective. .
In the conventional driving depth adjusting device 70 described above, the first compression spring 74 is interposed between the rear end of the operating member 75 and the main body 51, and the operating member 75 and thus the contact arm 61 are arranged by the first compression spring 74. Is biased downward (in the driving direction), and therefore the tip of the contact arm 61 is biased in the protruding direction with respect to the tip of the driver guide 56. Therefore, the pressing operation of the driving machine 50 against the workpiece W is performed by retracting the contact arm 61 with respect to the driver guide 56 against the first compression spring 74.
Further, the rear end portion 61 a of the contact arm 61 is in a state of being elastically pressed against the adjustment dial 73 by the second compression spring 76 set to a biasing force sufficiently smaller than that of the first compression spring 74. The engaging member 72 is elastically abutted against the cam surface of the cam member 71 by the urging force of the second compression spring 76. Therefore, the rotation operation of the adjustment dial 73 is performed by the second compression spring. The configuration is made against the axial urging force of 76.
Japanese Unexamined Patent Publication No. 2000-15591 JP 2000-190251 A

The conventional driving depth adjusting device 70 configured as described above has the following problems. That is, when the main body 51 is displaced in the direction of rising from the driven material W due to the reaction (impact) of the driving operation, the rear end portion 61a of the contact arm is separated from the adjustment dial 73 as shown by a two-dot chain line in FIG. As a result, the axial pressing force (engagement force) of the engagement portion 72 against the cam portion 71 (cam surface) by the second compression spring 76 is weakened. Since the cam member 71 and the adjustment dial 73 are supported so as to be freely rotatable about the axis of the operating member 75, the engaging force in the axial direction of the engaging portion 72 with respect to the cam member 71 is weakened. When the state is removed, the cam member 71 and the adjustment dial 73 may rotate carelessly and the adjustment position may be shifted. If the set driving depth is once deviated due to the reaction at the time of driving, it is necessary to adjust the driving depth again. In this respect, the usability of the driving machine is significantly impaired.
In order to solve this problem, a driving depth adjusting device 80 having a configuration shown in FIG. 7 is conventionally provided. The same symbols are used for members similar to the driving depth adjusting device 70 described above. The driving depth adjusting device 80 includes a third compression spring 81 interposed between the adjusting dial 73 and the rear end portion 61 a of the contact arm 61. 3 Since the urging force of the compression spring 81 acts, the engagement state of the engagement portion 72 with respect to the cam member 71 is reliably maintained and the rotation thereof is prevented. Even when 61a is relatively moved, the cam member 71 and the adjustment dial 73 are prevented from rotating carelessly.
However, when the third compression spring 81 is used, the contact arm 61 resists the third compression spring 81 when the distal end portion of the contact arm 61 is pressed against the workpiece W in order to perform the driving operation. Then, since the actuating member 75 is retracted after retreating by the stroke L, the relative movement amount of the contact arm 61 is only the stroke L to be moved against the third compression spring 81 as compared with the driving depth adjusting device 70. There is a problem that the operability is impaired at this point.
The present invention has been made to solve this problem, and even when the main body moves due to a reaction at the time of driving, the adjustment dial rotates inadvertently and the adjustment position shifts inadvertently. Therefore, it is easy to use since the adjusted driving depth is surely maintained, and the stroke of the contact arm is also improved by eliminating the stroke L of the conventional driving depth adjusting device 80. An object of the present invention is to provide a driving machine that can also ensure the above.

For this reason, the present invention is a driving depth adjusting device having a configuration described in each of the claims.
According to the driving depth adjusting device of the first aspect, inadvertent rotation of the cam member with respect to the operating member is regulated by the rotation regulating member provided on the cam member. For this reason, due to the reaction during the driving operation, the main body of the driving machine is displaced in the counter driving direction. As a result, the contact arm is displaced in the direction away from the cam member, and the engagement state of the engaging portion with respect to the cam portion is temporarily released. Even in such a case, since the inadvertent rotation operation of the cam member is regulated by the rotation regulating member, the setting depth once set is surely maintained without being displaced by reaction or the like. It does not impair the usability of the driving machine.
Further, since the cam member is provided with a rotation restricting member that engages in the radial direction and restricts the inadvertent rotation, the cam member is urged in the axial direction as in the prior art, and the inadvertent rotation thereof Therefore, the conventional third compression spring 81 or the urging means corresponding thereto can be omitted, so that the stroke for deforming the third compression spring 81 in the compression direction with respect to the retreat distance of the contact arm. Therefore, the operability of the driving machine can be ensured.
According to the driving depth adjusting device according to claim 2, the cam member is obtained by elastically fitting the rotation restricting member biased in the radial direction into the engaging groove of the operating member and engaging in the radial direction. Therefore, it is not necessary to restrict the inadvertent rotation by the axial urging force as in the prior art. Therefore, the conventional third compression spring or the urging means corresponding thereto is used. Can be omitted.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG.1 and FIG.2 has shown the driving machine 1 provided with the driving depth adjustment apparatus 20 which concerns on this embodiment. The driving machine 1 is a nail driving machine using compressed air as a driving source, and includes a main body part 2, a handle part 3, and a nail magazine 4. A trigger-type switch lever 8 is provided at the base of the handle portion 3 so as to be pulled up and down via a support shaft 8a. An idler 9 is supported on the back side of the switch lever 8 so as to be tiltable up and down in the drawing via a support shaft 9a. A trigger valve actuating rod 3a incorporated in the handle portion 3 is located behind the idler 9 (upward in the figure). The idler 9 tilts backward by a pressing operation of the contact arm 10 to be described later. When the switch lever 8 is pulled and operated in this tilted state, the actuating rod 3a moves upward in the figure and the trigger valve is turned on to perform the driving operation. If the pressing operation of the contact arm 10 is not performed, the idler 9 does not tilt backward, and therefore, in this state, even if the switch lever 8 is pulled, the actuating rod 3a is not displaced, so that the driving operation is not performed.
The main body 2 includes a striking piston 6 that reciprocates with compressed air. A driver 7 for hitting the head of the nail is integrally attached to the hitting piston 6. The driver 7 reciprocates in a cylindrical driver guide 5 provided so as to protrude from the lower surface of the main body 2. One nail is supplied to the driver guide 5 from the nail magazine 4 in conjunction with the nail driving operation.

A contact arm 10 is supported at the front end of the driver guide 5 so as to be able to reciprocate up and down. Details of the contact arm 10 are shown in FIGS. The contact arm 10 includes a pressing portion 11 having an annular shape surrounding the periphery of the tip portion of the driver guide 5, and an operating arm portion 12 extending long upward from the pressing portion 11. A rear end 12 a (upper end in the drawing) of the operating arm 12 reaches the side of the main body 2. An operating member 13 is supported on the rear end 12a. The operating member 13 includes a shaft portion 13a and a restricting portion 13b. The shaft portion 13a is supported by a support portion 4a provided in the nail magazine 4 through an insertion hole provided in the rear end portion 12a of the contact arm 10 so as to be movable in the axial direction.
A restriction pin 13c is fixed to the distal end side of the shaft portion 13a so as to penetrate in the radial direction. A second compression spring 15 is interposed between the restriction pin 13c and the rear end portion 12a of the contact arm 10. The rear end 12a of the contact arm 10 is urged upward in the figure by the second compression spring 15.
The shaft portion 13 a protrudes upward from the rear end portion 12 a of the contact arm 10. The restricting portion 13b is integrally provided on the protruding tip side. The restricting portion 13b is supported so as to be movable along the guide wall portion 2b provided in the main body portion 2, and thereby the rotation of the actuating member 13 around the axis is restricted. Further, the rotation of the shaft portion 13a and the rotation of the actuating member 13 about the axis is also restricted by engaging both end portions of the restriction pin 13c with the support portion 4a.
The rear end portion of the restricting portion 13b reaches directly under the tip of the idler 9. When the contact arm 10 is pressed against the workpiece W, the restricting portion 13b is integrally moved backward in the drawing. When the restricting portion 13b moves backward, the idler 9 tilts backward (clockwise in the figure) around the support shaft 9a. When the switch lever 8 is pulled in this tilted state, this pulling operation becomes effective and a driving operation is performed.
Further, the main body 2 is provided with a stopper portion 2c. The abutting end of the actuating member 13 upward in the figure is restricted by coming into contact with the stopper portion 2c.

A first compression spring 14 is interposed between the shaft portion 13 a and the fixed seat 2 a attached to the main body portion 2. The urging force of the first compression spring 14 acts on the contact arm 10 via a driving depth adjusting device 20 described later. The first compression spring 14 urges the contact arm 10 toward the forward side (driving side) below the figure. For this reason, the pressing operation of the contact arm 10 against the workpiece W is performed against the urging force of the first compression spring 14. Further, the first compression spring 14 has a sufficiently larger urging force than the second compression spring 15. The first compression spring 14 overcomes the urging force of the second compression spring 15 and urges the contact arm 10 toward the driving side (downward in the drawing) with an appropriate and sufficient urging force.
A cam member 21 constituting the driving depth adjusting device 20 of the present embodiment is supported on the shaft portion 13a. The cam member 21 is integrally provided with a disk-shaped adjustment dial 22 on the front side (the lower side in the drawing). Further, the rear surface of the cam member 21 is provided with a plurality of cam surfaces 21a to 21a whose heights are different in stages in the moving direction of the shaft portion 13a (moving direction of the contact arm 10). An engaging portion 13d is located behind the cam surface 21a. The engaging portion 13d is provided integrally with the shaft portion 13a.
The engaging portion 13 d is abutted against each cam surface 21 a of the cam member 21. By changing the abutting cam surface 21a, the length of the actuating member 13 with respect to the rear end portion 12a of the contact arm 10 (projecting dimension from the rear end portion 12a to the rear) changes. Since the retracted end (stroke) of the actuating member 13 is constant by the stopper member 2c, if the length of the actuating member 13 with respect to the rear end portion 12a changes, the forward end position (driver guide of the contact arm 10 during non-pressing operation) 5) (relative position with respect to the tip of 5) changes.
For example, as shown in FIG. 2, in a state where the engaging member 13 d is in contact with the low cam surface 21 a, the rear end portion 12 a of the contact arm 10 is displaced backward by the second compression spring 15. The position of the distal end portion (pressing portion 11) is relatively displaced backward, and the distance from the distal end portion of the driver guide 5 is reduced. For this reason, the distance between the front end portion of the contact arm 10 and the front end portion of the driver guide 5 at the time of the pressing operation becomes small or becomes zero and the driving depth becomes deep.

The engaging member 13 is urged by the first compression spring 14 in the driving direction (downward in FIG. 1). The urging force of the first compression spring 14 is received on the magazine 4 side when both end portions of the regulation pin 13c elastically contact the support portion 4a. Further, the cam surface 21 a is elastically pressed against the engagement member 13 by the second compression spring 15. Therefore, the engaging member 13 is pressed against the cam surface 21a by the urging force of the second compression spring 15 and is engaged in the axial direction. For this reason, the cam member 21 moves forward and backward together with the contact arm 10 during normal operation.
Further, when the rear end portion 12a urged in the axial direction by the second compression spring 15 is pressed, inadvertent rotation of the cam member 21 relative to the shaft portion 13a is restricted.
Moreover, in the present embodiment, the cam member 21 is also restricted from rotating relative to the shaft portion 13 a of the operating member 13 by the rotation restricting member 30. Details of the rotation restricting member 30 are shown in FIG. In the present embodiment, a steel ball is illustrated as an example of the rotation restricting member 30. The rotation restricting member 30 is biased radially inward by the fourth compression spring 31, that is, the shaft portion 13a side. Engaging grooves 13e to 13e having a semicircular cross section are formed in the shaft portion 13a along the axial direction. Each engaging groove 13e is formed over substantially the entire length of the shaft portion 13a. A plurality of the engaging grooves 13e to 13e are formed at equal intervals around the axis of the shaft portion 13a. When the rotation restricting member 30 on the cam member 21 side is elastically fitted into the engagement groove 13e by the fourth compression spring 31, inadvertent rotation of the cam member 21 is restricted.
On the other hand, since the engaging grooves 13e to 13e are formed long in the axial direction of the shaft portion 13a, the relative displacement of the shaft portion 13a in the axial direction with respect to the cam member 21 is restricted by the rotation restricting member 30. There is nothing. For this reason, when the adjustment dial 22 is rotated and the cam surface 21a against which the engaging portion 13d is abutted is changed, the axial displacement of the cam member 21 with respect to the shaft portion 13a is smoothly performed.
The rotation operation (driving depth adjustment operation) of the adjustment dial 22 is performed by a biasing force in the rotation direction of the rotation restricting member 30 biased by the fourth compression spring 31 (pressing force against the engaging groove 13e), first and second. This is done against the urging force in the axial direction by the compression springs 14 and 15.

According to the driving depth adjusting device 20 according to the present embodiment described above, the rotation restricting member 30 that is spring-biased in the radial direction by the fourth compression spring 31 is provided on the cam member 21, and this rotation restricting member. 30 is elastically fitted into the engaging groove 13e of the shaft portion 13a, and the inadvertent rotation of the cam member 21 is restricted. For this reason, the main body 2 is returned to the counter driving direction by, for example, driving operation, and as a result, the pressing of the contact arm 10 against the driven material W is released for a moment, and the pressing state of the rear end portion 12a against the adjustment dial 22 and the engaging portion 13d. Even if the pressing state of the second compression spring 15 on the cam surface 21a and the adjustment dial 22 no longer acts as a result, the cam surface 21a is released from the pressing state. Since the rotation of the member 21 is restricted by the rotation restricting member 30, these inadvertent rotations are restricted, so that the setting value of the once-set driving depth does not deviate. Usability of the depth adjusting device 20 can be ensured.
Thus, since the adjustment position (rotation position) of the cam member 21 and the adjustment dial 22 is held by the rotation restricting member 30, the urging force in the axial direction by the second compression spring 15 does not act due to the reaction at the time of driving. Even in such a state, the adjustment position (rotation position) is not shifted. Therefore, the third compression spring 81 is omitted in the configuration shown in FIG. 7 and the rear end portion 12a of the contact arm 10 is directly in contact with the adjustment dial 22 (configuration shown in FIG. 7). The adjustment dial 22 does not rotate carelessly due to the reaction during the driving operation. Therefore, the contact arm 10 is pressed by omitting the stroke L in the direction in which the conventional third compression spring 81 is contracted while maintaining good usability in which the setting value of the driving depth once adjusted is reliably maintained. The stroke at the time of operation can be shortened, and thereby the operability of the driving depth adjusting device 20 can be improved.

Various modifications can be made to the embodiment described above. For example, although the steel ball is exemplified as the rotation restricting member, the rotation restricting member may be changed to a member having another shape and material such as a pin.
Moreover, although the 4th compression spring 31 was illustrated as a means to urge | bias a rotation control member to radial direction, it is good also as a structure which replaces with this and uses a leaf spring, rubber | gum, or a damper.
Further, the biasing means as a separate member such as the fourth compression spring 31 is omitted, and an engaging convex portion that can be elastically deformed is integrally provided on the inner peripheral side of the cam member, and this engaging convex portion is provided with the shaft portion 13a. It is good also as a structure which engages with the engaging groove 13e of the side and regulates the careless rotation.
Further, the exemplified driving depth adjusting device 20 is not limited to a compressed air type nailing machine, and can be widely applied to other types of driving machines such as an electric nailing machine using an electric motor as a driving source or a tucker. Can do.

It is a whole side view of a driving machine provided with a driving depth adjusting device concerning an embodiment of the present invention. It is a side view of a contact arm and a driving depth adjusting device. This figure shows a normal state in which the urging forces of the first and second compression springs act on the cam member in the axial direction. It is a side view of a contact arm and a driving depth adjusting device. This figure shows a state at the time of driving reaction in which the urging force in the axial direction by the first and second compression springs does not act on the cam member. It is a (4)-(4) arrow directional view of FIG. 2, Comprising: It is a cross-sectional view which shows the engagement state of the rotation control member with respect to the axial part of the action | operation member. It is a whole side view of a driving machine provided with the conventional driving depth adjusting device. It is a side view of the conventional driving depth adjusting device. It is a side view of the conventional driving depth adjustment apparatus of the type which controlled the careless rotation of the cam member through the 3rd compression spring.

Explanation of symbols

W ... Material to be driven 1 ... Driving machine (nailing machine)
DESCRIPTION OF SYMBOLS 2 ... Main-body part 4 ... Nail magazine 5 ... Driver guide 6 ... Impact piston 7 ... Driver 8 ... Switch lever 10 ... Contact arm 12 ... Actuation arm part, 12a ... Rear end part 13 ... Actuation member, 13a ... Shaft part, 13e ... Engaging groove 14 ... first compression spring 15 ... second compression spring 20 ... driving depth adjusting device 21 ... cam member, 21a ... cam surface 22 ... adjusting dial 30 ... rotation regulating member (steel ball)
31 ... Fourth compression spring 50 ... Driving machine (conventional)
60 ... erroneous operation preventing mechanism 61 ... contact arm 70 ... driving depth adjusting device (conventional)
71 ... Cam member 72 ... Engaging portion 73 ... Adjustment dial 74 ... First compression spring 75 ... Actuating member 76 ... Second compression spring 81 ... Third compression spring

Claims (2)

In the driving machine that is in a state where the driving operation is possible when the contact arm is moved backward relative to the driver guide by the pressing operation to the driven material of the driving machine body,
Provided at the rear end of the contact arm is an actuating member for restricting the retracted end of the contact arm so as to be relatively movable along the driving direction, and the shaft of the actuating member has a plurality of stages having different heights in the moving direction. A cam member having a cam surface is provided to be rotatable about an axis, and an engagement portion provided integrally with the operating member is engaged with the cam surface of the cam member in the axial direction so as to contact the contact of the operating member. An apparatus for adjusting the driving depth by changing a retreat distance of the contact arm by changing a length with respect to the arm;
The cam member is provided with a rotation restricting member , and is driven in such a manner that the rotation restricting member is always engaged with the actuating member in the radial direction for restricting the rotation of the cam member over the entire movement range of the contact arm. Depth adjustment device. 2. The driving depth adjusting device according to claim 1, wherein a plurality of engagement grooves are provided in the operation member along an axial direction and corresponding to the plurality of cam surfaces, and the rotation restricting member. The driving depth adjusting device is configured such that the rotation restricting member is elastically fitted in the engaging groove to restrict the rotation of the cam member.

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