JPH0680572U - Driving depth adjusting device of driving machine - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts of the driving depth adjusting device of the driving machine. [Structure] A screw rod 23 and a nut 24 screwed to the screw rod 23 are arranged in parallel to the nose portion of the driving tool. The screw rod 23 is rotatably connected to the front contact arm 22A on the nose side. The nut 24 is connected to the rear contact arm 22B on the trigger lever side. A knob 31 is provided adjacent to the front contact arm and the screw rod, and the elastic member 32 biases the knob 31 toward the front contact arm. The knob 33 and the front contact arm are integrally formed with a convex portion 33 and a concave portion 34 that engage with each other of the click / stop mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for adjusting the driving depth of a driving tool.

[0002]

[Prior art]

 A driving machine such as a nail driving machine is provided with a contact arm extending from a nose portion to a trigger, as shown in Japanese Utility Model Laid-Open No. 60-117072.

This contact arm operates the trigger valve in cooperation with the trigger. That is, when a fastener such as a nail is driven into the material to be driven, the tip of the contact arm is pressed against the material to be driven, and when the trigger is pulled, the trigger valve operates and compressed air is introduced into the cylinder in the main body. . The piston in the cylinder receives the compressed air and moves forward, and a driver fixed to the front part of the piston drives the stopper from the nose portion toward the material to be driven.

The driving depth of the stopper needs to be adjusted according to the hardness of the material to be driven, etc., and the contact arm is shown in FIG. 4 so that the driving amount can be adjusted. Such a driving depth adjusting device is provided.

That is, a screw rod 1 and a nut 2 screwed to the screw rod 1 are arranged in parallel to the nose portion of the driving tool, and the nut 2 is connected to a front contact arm 3 arranged toward the nose portion. . A shaft portion 4 is formed at the front end portion of the nut 2, and the shaft portion 4 is rotatably fitted in a hole 5 of the front contact arm 3. The nut 2 is fixed by a bolt 6 and a washer 7 so as not to separate from the front contact arm 3.

On the other hand, the threaded rod 1 is connected to a rear contact arm 8 arranged toward the trigger valve of the driving tool. A knob 9 for turning the nut 2 is provided adjacent to the front contact arm 3 and the nut 2. The knob 9 is fixed to the nut 2. The front end surface of the knob 9 faces the bent portion 3a of the front contact arm 3, and a click stop mechanism is provided there. That is, a plurality of cavities 10 are provided in the knob 9 along a circle, and a sphere 11 and a compression coil spring 12 for urging the sphere 11 outward are inserted into each cavity 10, and the front contact arm 3 In the bent portion 3a of the above, a large number of recesses 13 that engage with the respective balls 11 are provided corresponding to the respective balls 11.

Then, when the knob 9 is held and turned in a desired direction, the nut 2 rotates together with the knob 9 with respect to the front contact arm 3. At this time, the sphere 11 repeats engagement and disengagement with respect to each recess 13 and repeatedly appears and disappears in the cavity 10. By rotating the knob 9, the screw rod 1 moves in the front-rear direction with respect to the nut 2 together with the rear contact arm 8. As a result, the contact arms 3 and 8 as a whole expand and contract in the front-rear direction, and the amount of protrusion at their front ends is adjusted. If the amount of protrusion is large, the driving depth of the stopper is reduced, and if the amount of protrusion is small, the driving depth of the stopper is increased.

[0008]

[Problems to be solved by the device]

 However, since the above-mentioned conventional driving depth adjusting device has a large number of cavities, compression coil springs, balls, etc. in its knob, the number of parts is large and the assembling work is troublesome.

[0009] Therefore, an object of the present invention is to reduce the number of parts in a conventional driving depth adjusting device so that the device can be assembled easily and quickly.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, according to the present invention, one of a screw rod arranged parallel to the nose portion of a driving tool and a nut screwed with the screw rod is rotatable to a front contact arm on the nose portion side. The other of the screw rod and the nut is connected to the rear contact arm of the driving machine on the side of the trigger lever, and the adjacent portion between the front contact arm and the screw rod or nut is provided with an elastic member as described above. A knob is provided for turning the threaded rod or nut biased towards the front contact arm, the knob and the front contact arm interengaging a click-stop mechanism. It adopts the structure of the driving depth adjusting device of the driving machine in which the convex portion and the concave portion are integrally molded.

[0011]

[Action]

 The interlocking convex and concave portions of the click and stop mechanism are integrally molded with the knob and the front contact arm, respectively. Also, one elastic member is sufficient to press the entire knob against the front contact arm. For this reason, a large number of balls and a compression coil spring as in the prior art are not required, and the assembling work is simplified.

When operating the driving depth adjusting device, the knob may be turned in either direction. Since the knob is biased toward the front contact arm by the elastic member, the engagement and disengagement of the convex portion and the concave portion are repeated with the rotation, and the knob sways in the front-rear direction. Further, as the knob rotates, the screw rod or nut also rotates, and the screw rod and nut move relatively.

As a result, the length of the contact arm expands and contracts, and the amount of protrusion from the nose portion of the front end of the contact arm is adjusted. If the amount of protrusion is large, the driving depth of the stopper is reduced, and if the amount of protrusion is small, the driving depth of the stopper is increased.

[0014]

【Example】

 An embodiment of a driving depth adjusting device for a driving machine according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, this driving machine supplies a driving machine main body 14, a nose portion 15 protruding from the driving machine main body 14, and a fastener such as a nail into the nose portion 15. And a magazine section 16 of.

Although not shown in the drawing, the driver body 14 has a piston holding a driver for hitting a fastener such as a nail, a cylinder slidably accommodating the piston, and a rear portion of the cylinder. A main valve unit that opens and closes the end to introduce and discharge compressed air to and from the cylinder to reciprocate the piston, a trigger valve for operating the main valve unit, and the like are housed.

As shown in FIGS. 1 and 2, the stem 35 for operating the trigger valve is projected forward from the inside of the driving machine body 14, and the trigger lever 17 is provided so as to face the stem 16. It is mounted on the driving tool body 14.

The trigger lever 17 is rotatably supported in the front-rear direction by the driving machine body 14 via a support shaft 18. In the trigger lever 17, a contact lever 19 that cooperates with the trigger lever 17 when the trigger valve is operated is rotatably supported. The contact lever 19 is rotatably supported in the lower part of the trigger lever 17 through the other support shaft 20 parallel to the support shaft 18 in the front-rear direction, and the back surface of the middle portion thereof faces the stem 35 of the trigger valve. is doing. An intermediate lever 21 is provided between the trigger lever 17 and the contact lever 19 to integrate them. When the trigger lever 17 is pulled, the intermediate lever 21 and the contact lever 19 move together with the trigger lever 17, and the contact lever 19 pushes the system 35.

The nose portion 15 is attached to the front portion of the driving tool body 14, and its center axis is on an extension of the central axis of the driver in the driving tool body 14. The magazine section 16 is connected to the nose section 15, and the stoppers are supplied into the nose section 15 one by one.

The driving tool is provided with a contact arm 22 at a position from the nose portion 15 to the trigger lever 17. The contact arm 22 cooperates with the trigger lever 17 to operate the trigger valve. That is, when a fastener such as a nail is driven into a material to be driven (not shown), the tip of the contact arm 22 is pressed against the material to be driven, and further the trigger lever 17 is pulled to operate the trigger valve and to release compressed air. It is introduced into the cylinder inside the driving machine body 14. The piston in the cylinder receives the compressed air and moves forward, and the driver fixed to the front portion thereof drives the stopper from the nose portion 15 toward the driven material.

It is necessary to adjust the driving depth of the stopper according to the hardness of the material to be driven and the like, so that the contact arm 22 can be adjusted so as to adjust the driving amount. A driving depth adjusting device as shown in 3 is provided.

That is, the contact arm 22 is divided into a front contact arm 22A on the nose portion 15 side and a rear contact arm 22B on the trigger lever 17 side, and a screw rod 23 parallel to the nose portion 15 and A nut 24 to be screwed is arranged.

The front contact arm 22 A includes a bent portion 22 a extending from the rear portion toward the front portion in a direction orthogonal to the screw rod 23, an intermediate portion 22 b extending along the nose portion 15, and a nose portion 15. A front end portion 22c that overlaps the front end of the front end is sequentially formed.

The screw rod 23 is a rod material having a male screw 23a in the middle portion, and a collar portion 23b, a knob support portion 23c, and a shaft portion 23d are sequentially arranged forward in front of the male screw 23a. Has been formed. The screw rod 23 is rotatably inserted into the hole 22d of the bent portion 22a of the front contact arm 22A at the shaft portion 23d. Further, the shaft portion 23d is locked to the bent portion 22a by a bolt 25 and a washer 26 so as not to fall off the bent portion 22a. A shaft portion 23e on the rear side of the male screw 23a of the screw rod 23 is inserted into the driving machine body 14 so as to be slidable in the front-rear direction.

The front end of the rear contact arm 22 B is fixed to the nut 24, and the rear end faces the upper part of the contact lever 19 in the trigger lever 17. The middle portion is supported by a guide member 27 fixed to the driving machine body 14 so as to be movable back and forth.

A rear stopper 28 integrated with the nose portion 15 is provided behind the nut 24, and a compression coil spring 29 is interposed between the nut 24 and the rear stopper 28. A front stopper 30 integrated with the magazine section 16 is provided in front of the rear contact arm 22B. Therefore, the contact arm 22 is stopped by the rear contact arm 22B being pressed against the front stopper 30 by the urging force of the compression coil spring 29, and is pressed rearward when being pressed against the material to be driven into the nut 24. Is stopped by hitting the rear stopper 28. A knob 31 for turning the screw rod 23 is provided on the knob support portion 23c which is a portion adjacent to the front contact arm 22A and the screw rod 23. The knob support portion 23c has a non-circular cross section, and the knob 31 is slidable in the central axis direction of the screw rod 23 by engaging with the knob support portion 23c. It can be rotated with. The knob 31 and the knob support portion 23c may be connected by a sliding key.

A click / stop mechanism is interposed between the knob 31 and the front contact arm 22A. That is, a cavity 31a is formed between the knob support portion 23c and the rear portion of the knob 31, and an elastic member that constantly urges the knob 31 toward the bent portion 22a between the cavity 31a and the collar portion 23b. The compression coil spring 32 is interposed. In addition, hemispherical protrusions 33 are integrally formed with the knob body at a constant pitch along the circumference on the front end surface of the knob 31, and the bent portion 22a has holes for engaging with the protrusions 33. -Shaped recess 34 is provided.

When the knob 31 is held and turned in a desired direction, the screw rod 23 rotates together with the knob 31 with respect to the bent portion 22a of the front contact arm 22A. At that time, the convex portion 33 repeatedly engages and disengages with each concave portion 34, and the knob 31 swings back and forth on the screw rod 23 each time. Then, by rotating the knob 31 and the screw rod 23, the nut 24 moves in the front-rear direction with respect to the screw rod 23 together with the rear contact arm 22B. As a result, the contact arm 22 as a whole expands and contracts in the front-back direction, and the amount of protrusion of the front end portion 22c of the front contact arm 22A from the nose portion 15 is adjusted. If the amount of protrusion is large, the driving depth of the stopper is reduced, and if the amount of protrusion is small, the driving depth of the stopper is increased.

Next, the driving operation of the driving machine will be described. First, in order to adjust the driving depth according to the hardness of the material to be driven, etc., hold the knob 31 and turn it in either direction. Since the knob 31 is biased toward the front contact arm 22A by the compression coil spring 32, the engagement and disengagement of the convex portion 33 and the concave portion 34 are repeated with the rotation thereof, and the front and rear directions are made in small steps. Rock. Further, as the knob 31 rotates, the screw rod 23 also rotates, and the screw rod 23 moves in the front-rear direction with respect to the nut 24 together with the front contact arm 22A.

As a result, the length of the contact arm 22 expands and contracts, and the amount of protrusion of the front end portion 22c of the contact arm 22 from the nose portion 15 is adjusted. If the amount of protrusion is large, the tip of the driver will move away from the material to be driven, and the driving depth of the stopper will be reduced. On the other hand, if the amount of protrusion is small, the tip of the driver will reach the material to be driven, and the driving depth of the stopper will increase accordingly.

When the front end portion 22c of the contact arm 22 is pressed against the material to be driven after the adjustment of the driving depth, the contact arm 22 moves rearward and the rear end 22e contacts the contact lever 19. The contact lever 19 pivots rearward about the support shaft 20 as a fulcrum and approaches the stem 35. Therefore, when the trigger lever 17 is pulled backward, the trigger valve operates as described above to guide the compressed air into the cylinder. As a result, the piston advances in the cylinder, and the driver drives the stopper out of the nose portion 15.

In the above embodiment, the nut 24 is connected to the front contact arm 22A, the knob 31 is attached to the nut 24, and the rear contact arm 22B is connected to the screw rod 23. The same amount of driving can be adjusted.

[0033]

[Effect of device]

 In the present invention, the protrusion and the recess that engage with each other of the click-stop mechanism are integrally molded on the knob and the front contact arm, respectively, and there is only one elastic member that presses the entire knob against the front contact arm. Is enough. Therefore, according to the present invention, it is possible to reduce the number of parts by omitting a large number of balls and a compression coil spring as in the prior art, and to simplify and speed up the assembly work.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a driving machine equipped with a driving depth adjusting device according to the present invention.

FIG. 2 is a partially cutaway side view of a front portion of the driving tool.

FIG. 3 is a partially cutaway side view of the driving depth adjusting device.

FIG. 4 is a partially cutaway side view of a conventional driving depth adjusting device.

[Explanation of symbols]

 15 ... Nose part 17 ... Trigger lever 22A ... Front contact arm 22B ... Rear contact arm 23 ... Screw rod 24 ... Nut 31 ... Knob 32 ... Compression coil spring 33 ... Convex part 34 ... Recessed part

Claims (1)

[Scope of utility model registration request] 1. A screw rod arranged parallel to a nose portion of a driving machine and one of nuts screwed to the screw rod is rotatably connected to a front contact arm on the nose portion side, and the screw rod and The other of the nuts is connected to the rear contact arm on the trigger lever side of the driving tool, and an elastic member is attached to the front contact arm toward the adjacent portion between the front contact arm and the screw rod or nut. A knob for rotating the biased screw rod or nut is provided, and the knob and the front contact arm are integrally formed with a convex portion and a concave portion that engage with each other of the click / stop mechanism. A driving depth adjusting device for a driving machine characterized by the above.