JP2010023173A - Pneumatic tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tool equipped with a mechanism to change over between continuous driving and single driving automatically, capable of precluding no-load driving in the operation with so-called shift driving, when each fastener is driven with the nose part shifted, while it maintains the condition that the forefront of the nose part to drive the faster is pressed to the material whereto driving is made. <P>SOLUTION: A no-load driving preventing arm 30 is installed between a lower arm 24 and an upper arm 25 to work interlocking with a driver guide 21 in such an arrangement that one end of the arm 30 is engageable with the upper arm 25 and the other end is supported on a shaft 28 provided on the tool body 1 in such a way as turnable up and down. The no-load driving preventing arm 30 is furnished with a seesaw arm 31 swingably in such a fashion that one end of the seesaw arm 31 is engageable with the lower arm 24 while the other end is engaged with the top of a no-load driving preventive pin 32 provided on the tool body 1. The no-load driving preventive pin 32 is supported on the upper part of a slider 33 slidable in the transverse direction interlocking with a fastener pressing pusher 17 when the last fastener in the magazine goes out, the fastener pressing pusher 17 slidable in the transverse direction, and the slider 33 slips off from the preventive pin 32 when the slider 33 slides. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is equipped with a mechanism for automatically switching between continuous hitting (single hitting) and single shot (single hitting), and while maintaining the state in which the tip of the nose portion for pushing out the fastener is pressed against the driven material, The present invention relates to a pneumatic tool capable of preventing idling during so-called slipping, in which a fastener is driven out by shifting.

  In general, when using a pneumatic tool such as a nail driver, screwdriver, tacker or the like to drive fasteners such as nails, driving screws, staples, etc. into the driven material, pull the trigger in advance to make the nose part into the driven material. A continuous hammering (continuous hammering) in which the fastener is punched when pressed and a single hammering (single hammering) in which the fastener can be hammered on the condition that the trigger is pulled after the nose portion is pressed against the workpiece. The pneumatic tool is equipped with a mechanism for switching between continuous hitting and single hitting so that it can be switched between continuous hitting and single hitting according to the construction conditions. In any case, if the nose portion is not pressed against the driven material, the safety mechanism is not released and the trigger operation becomes invalid.

  When a fastener is driven into the surface of the interior material, the construction state appears on the surface and can be visually recognized. Therefore, the appearance after construction is also important. When a fastener is driven into such a place, it is often performed with a single shot that is easy to aim at each shot. In addition, if blanking is performed to activate the pneumatic tool even though the fastener is inside the nose, if the driven material is a finishing material, the blanked driver will damage the surface. Is equipped with an anti-blank mechanism.

  The blanking prevention mechanism prevents the blanking by starting the pneumatic tool even though all the fasteners are consumed in the magazine storing a large number of fasteners. The mechanism is known to lock the safety mechanism when the pusher moves to a position where there is no fastener in conjunction with the movement of the pusher that supplies the fastener to the nose in the magazine, and to lock the trigger. It has been. In the system that locks the safety mechanism, the safety mechanism is released when the fastener is driven continuously while maintaining the state where the tip of the nose portion is pressed against the driven material. And the pneumatic tool is activated. For this reason, idle driving cannot be prevented. Further, in the method of locking the trigger, if there is no fastener in the magazine, the trigger cannot be operated, so that it is possible to prevent idle driving.

By the way, since the material to be driven is not a finishing material such as a floor material, and the discarding work for fastening the lower material of the floor material requires work in a short time, continuous hitting is required. In the case of hitting even in the single shot mode, hitting can be performed relatively continuously. At present, it is known that a mechanism for switching a single shot of a pneumatic tool for constructing a floor material is manually operated and automatically switched (see Patent Document 1).
JP2008-36756

  However, no pneumatic tool has yet been developed to prevent blanking when it is hit in the conventional single-stroke mode.

  An object of the present invention is to solve the above-described problems, and to provide a pneumatic tool capable of preventing idling even when performing slapping.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a nose portion for punching a fastener at a lower portion of a tool body provided with an impact mechanism driven by air pressure, and a magazine for pressing the fastener to the nose portion with a pusher. The contact part is slidable along the nose part, the lower end of the contact part protrudes from the tip of the nose part, the lower arm is provided at the upper end, and the upper arm is provided at the upper part of the lower arm for activation. Pneumatic pressure provided so that it can be engaged with a contact lever that is pivotally provided on the trigger, and the trigger is activated only when the upper arm fully pushes up the contact lever to activate the impact mechanism. In the tool, a blanking prevention arm is disposed horizontally between the upper arm and the lower arm, and one of the blanking prevention arms is arranged. Is attached to the upper arm so that it can be engaged with the upper arm, and the other end is supported by a spindle provided on the tool body so that it can be turned up and down. One end of the seesaw arm can be engaged with the lower arm, the other end of the seesaw arm can be engaged with the upper end of the empty strike prevention pin provided on the tool body, and the idle strike prevention pin can be It is supported by the upper part of the slider that can slide and slide in the horizontal direction in conjunction with the pusher for pressing the zipper when the last zipper of the magazine is gone. Features.

  According to a second aspect of the present invention, in the first aspect, the trigger is provided with a switching mechanism for continuous strike and single shot.

  According to the first aspect of the present invention, the blanking prevention arm is disposed laterally between the upper arm and the lower arm, one end of the blanking prevention arm is provided to be engageable with the upper arm, and the other end is provided on the tool body. The support shaft is supported so that it can be pivoted up and down, and the intermediate part of the seesaw arm is swingably provided on the rotation shaft of the intermediate part of the anti-running arm so that one end of the seesaw arm can be engaged with the lower arm Provided to engage the other end of the seesaw arm with the upper end of a blanking prevention pin provided on the tool body, and to press the fastener when the last fastener of the magazine runs out. Since it is supported on the top of the slider that can slide in the horizontal direction in conjunction with the pusher, and when the slider slides, it is configured so that it can be removed from the idle pin. Since Kunar a slider is disengaged from the idle driving preventive pin, idle driving preventive pin will down by the slider component is lost the support, it becomes lower supporting position of the seesaw arm. In this state, even if the driver guide is pressed against the material to be driven and the lower arm is moved upward, the seesaw arm simply turns idle and hardly moves upward, so that the idle driving prevention arm also hardly rotates upward. For this reason, the upper arm also moves only slightly, so that the upper end of the upper arm cannot sufficiently push up the contact lever. Therefore, even if a single stroke operation is performed in which the trigger is pulled up after the driver guide is pressed, the contact lever cannot eventually push up the valve stem, so that the trigger is invalidated and the pneumatic tool does not operate. Therefore, it is possible to prevent idling even in the case of performing the hitting.

  According to the second aspect of the present invention, when a switching mechanism between continuous and single shots is provided, not only single shots but also continuous shots cannot be performed.

  FIG. 1 is a perspective view of a stapling nailing machine. In FIG. 1, reference numeral 1 denotes a tool body, 2 denotes a grip, and 3 denotes a magazine. A nose portion 4 is provided at the lower portion of the tool body 1. Compressed air is supplied to the tool body 1 from the rear end of the grip 2, and the compressed air is stored in the air chamber 5.

  The nailing machine is operated by pushing up the valve stem 8 of the trigger valve 7 by pulling up the trigger 6, and according to this, the air line 12 communicating with the valve upper chamber 11 of the main valve 10 is opened to the atmosphere. The valve upper chamber 11 is depressurized, the main valve 10 is opened upward as shown in the figure, and the compressed air in the air chamber 5 is supplied to the upper portion of the impact cylinder 13 to be received in the impact piston 14 accommodated in the impact cylinder 13. And a driver 15 integrally coupled thereto are driven downward to drive out staples (connected staples) s supplied from the magazine 3 to the nose portion 4.

  When the trigger 6 is released after the staples are driven, the trigger valve 7 is activated, and the compressed air in the air chamber 5 is supplied to the valve upper chamber 11 via the air conduit 12. As a result, the pressure difference between the upper and lower ends of the main valve 10 is reversed, so that the main valve 10 operates downward, the pipe line between the air chamber 5 and the blow cylinder 13 is closed, and the pipe line between the blow cylinder 13 and the exhaust chamber. Is opened. With this closing operation, the compressed air in the striking cylinder 13 is exhausted.

  Note that a pusher 17 is engaged with the rear end of the staple s in the magazine 3. The pusher 17 is always urged forward by a pusher spring 18 to press the staple s, and is always sent out into the injection port of the nose portion 4. A protrusion 20 is formed at the upper end of the pusher 17.

  By the way, as shown in FIG. 2, the nailing machine is provided with a contact portion a. The contact portion a is a portion that moves when the tip of the injection port is pressed against the driven material, and includes a driver guide 21, a contact arm 22, a contact bolt 23, and a lower arm 24.

  The driver guide 21 is provided so as to be slidable in the driving direction along the nose portion 4, and is a member that guides the driver 15 that drives the staple s and the staple s that are driven, and is always urged downward by a spring (not shown). Yes. One end 22 a of the contact arm 22 is connected to the driver guide 21, and the other end 22 b is screwed into an intermediate portion of a contact bolt 23 provided so as to be movable in parallel with the driver guide 21. An L-shaped lower arm 24 is engaged with the upper end of the contact bolt 23.

  Incidentally, an upper arm 25 is provided above the lower arm 24 so as to be movable up and down. An engaging groove 26 is formed in the lower portion of the upper arm 25, and the upper end of the upper arm 25 is disposed so as to be engageable with a lower surface of a contact lever 27 that is provided rotatably on the trigger 6. The contact lever 27 is disposed below the valve stem 8 of the trigger valve 7 so as to be pivotable up and down about an axis, and is provided so that the valve stem 8 can be pushed in when the trigger 6 is pivoted.

  Next, an idle driving prevention mechanism b is provided between the upper arm 25 and the lower arm 24. As shown in FIG. 1, the idling prevention mechanism b includes an idling prevention arm 30, a seesaw arm 31, an idling prevention pin 32, a slider 33, and the pusher 17.

  As shown in FIGS. 2, 3, and 12, the blanking prevention arm 30 is disposed laterally between the upper arm 25 and the lower arm 24, and one end 30 a thereof is an engagement groove 26 in the lower portion of the upper arm 25. The other end 30b is supported on a support shaft 28 provided on the tool body 1 so as to be rotatable up and down.

  The seesaw arm 31 is disposed so as to overlap the idle driving prevention arm 30, and an intermediate part thereof is provided on a rotary shaft 34 at an intermediate part of the idle driving prevention arm 30 so as to be swingable. One end of the seesaw arm 31 is bent, and the bent portion 35 is disposed to be engageable with the upper end of the lower arm 24. Further, the other end 31 a of the seesaw arm 31 is disposed so as to be able to engage with an upper end of an idle driving prevention pin 32 provided in the tool body 1.

  The idling prevention pin 32 is always urged upward by a compression spring 37 and supported by the upper portion of the slider 33.

  The slider 33 is disposed so as to be slidable in the lateral direction, that is, in the same direction as the movement direction of the pusher 17, and is always urged by the compression spring 36 in the direction of supporting the idle driving prevention pin 32. Further, the slider 33 is disposed so as to be able to engage with the protrusion 20 protruding from the upper end of the pusher 17. When the pusher 17 moves when the last fastener is removed, the protrusion 20 is engaged, and the pusher spring is further engaged. 18 slides against the compression spring 36 so that it is disengaged from the lower end of the idle driving prevention pin 32.

  Next, the nailing machine will be described together with the operation mode of the idle driving prevention mechanism. When the staples s are stored in the magazine 3, the protrusions 20 of the pusher 17 do not hit the slider 33, so that the slider 33 supports the idling prevention pin 32. In this state, in order to make a single shot, as shown in FIGS. 2 and 4, when the driver guide 21 is first pressed against the material to be driven, the driver guide 21 itself is pushed up and moves up. When the driver guide 21 moves up, the contact arm 22, the contact bolt 23, and the lower arm 24 also move up.

  When the lower arm 24 moves upward, the upper end of the lower arm 24 comes into contact with one end 35 of the seesaw arm 31 and pushes up. When one end 35 of the seesaw arm 31 is pushed up, the other end 31a of the seesaw arm 31 is supported by the idle driving prevention pin 32, so that the whole moves upward with this as a fulcrum. When the seesaw arm 31 is moved upward, the rotation shaft 34 is also moved upward, so that the idle driving prevention arm 30 is also rotated upward about the end 30b. Since the other end 30 a of the blanking prevention arm 30 is engaged with the engagement groove 26 of the upper arm 25, the upper arm 25 also moves upward, and its upper end is close to the contact lever 27. When the trigger 6 is pulled in this state, as shown in FIG. 5, the contact lever 27 is lifted and pushed up against the lower end of the valve stem 8 of the trigger valve 7. As a result, the trigger valve 7 is operated, and the compressed air in the valve upper chamber 11 of the main valve 10 is exhausted to open the main valve 10 as described above, so that the staple s driving operation is performed.

  Next, when the driver guide 21 is separated from the material to be driven, the driver guide 21 is moved downward by the spring, and the contact arm 22, the contact bolt 23, and the lower arm 24 are also moved downward, so that the seesaw arm 31 is also moved downward. Since the blanking prevention arm 30 also rotates downward, the release of the trigger 6 causes the contact lever 27 to move away from the valve stem 8, so that the trigger valve 7 returns to the initial state shown in FIG. Since the compressed air is sent to the ten valve upper chambers 11, the main valve 10 is closed and the next staple s is driven. When the trigger 6 is pulled up after the driver guide 21 is pressed against the driven material again, the next staple driving is performed. A single shot can be performed in this way.

  If the driver guide 21 is moved away from the material to be driven while the trigger 6 is pulled, the continuous switching lever 38 is hooked on the trigger claw portion 39 and the upper end position of the upper arm 25 is held as shown in FIG. For this reason, the contact lever 27 is kept in a sufficiently high state. In order to activate the staple s again, the trigger 6 must first be released. In this way, a single shot is performed.

  By the way, when the staple s is driven, the trigger 6 is released, and when the driver guide 21 is shifted to the side while being pressed against the material to be driven to perform stapling at another position, the trigger 6 is released, so that the striking cylinder is released. 13 is exhausted and the main valve 10 is closed and operated, but the driver guide 21 is pressed against the material to be driven as shown in FIGS. The state pushed up sufficiently high is maintained. Therefore, when the trigger 6 is pulled up again at the shifted position, the trigger valve 7 is actuated as shown in FIG. 5, and the staple s is driven. In this way, it is possible to make a hit.

  On the other hand, when the trigger 6 is first pulled up when the staple s is driven, the contact lever 27 is tilted and its tip engages with the upper end of the upper arm 25 as shown in FIG. After that, when the lower end of the driver guide 21 is pressed against the material to be driven and moved upward relative to the nose portion 4, the contact arm 22, the contact bolt 23, and the lower arm 24 are moved upward in the same manner as described above. Thus, the seesaw arm 31 and the blank strike prevention arm 30 move the upper arm 25 upward and further rotate the contact lever 27 upward, so that the contact lever 27 pushes up the valve stem 8, thereby driving the staple s into place. Done.

  Next, when the driver guide 21 is moved away from the driven material while the trigger 6 is pulled, the same state as in FIG. 6 is obtained. Therefore, when the driver guide 21 is pressed against the driven material again, the same as described above, FIG. Thus, the lower arm 24 is moved upward, the seesaw arm 31 and the blanking prevention arm 30 are rotated upward to move the upper arm 25 upward, and the contact lever 27 is rotated upward. At this time, since the trigger 6 has already been pulled up, the contact lever 27 pushes up the valve stem 8, so that the trigger valve 7 and the main valve 10 are operated, and the next staple s driving operation is performed.

  In this way, the staples s can be driven repeatedly each time the tip of the driver guide 21 is pressed against the material to be driven while the trigger 6 is being pulled.

  As described above, the nailing machine can automatically switch the single shot.

  Next, as the staple is consumed in the magazine 3, the pusher 17 moves forward. Therefore, when the last staple s disappears and the pusher 17 moves further forward, the protrusion 20 at the upper end moves the slider 33 to the compression spring 36. Then, it is slid in the pushing-back direction and removed from the bottom of the idle pin 32 as shown in FIG. When the slider 33 is disengaged from the idling prevention pin 32, the idling prevention pin 32 loses its support and falls as shown in FIGS. 9 and 10, so that the support position (fulcrum) of the other end 31a of the seesaw arm 31 is lowered. End up. In this state, even if the driver guide 21 is pressed against the material to be driven and the lower arm 24 is moved upward, as shown in FIG. 11, the seesaw arm 31 only rotates idle and hardly moves upward. Similarly, 30 hardly rotates upward. For this reason, since the upper arm 25 also moves only slightly, the upper end of the upper arm 25 cannot sufficiently push up the contact lever 27.

  Therefore, even if a continuous driving operation is performed in which the driver guide 21 is pressed against the driven material after the trigger 6 is pulled or a single driving operation is performed in which the trigger 6 is lifted after the driver guide 21 is pressed, the result is shown in FIG. Since the contact lever 27 cannot push up the valve stem 8, the trigger valve 7 does not operate.

  In addition, since a single stroke cannot be performed, the staple s cannot be driven because the contact lever 27 is not sufficiently rotated even if a shift is attempted.

  The contact part a is not limited to the driver guide 21. The contact arm 22 may protrude directly from the tip of the nose portion 4 and may be slidably provided on the nose portion 4, or the contact bolt 23 may be omitted. In short, any member that detects that the nose portion 4 has been pressed against the material to be driven may be used.

  The present invention is not limited to a staple nailing machine. The present invention can also be applied to pneumatic tools such as general nailing machines and screw driving machines.

Sectional view of a staple nailing machine according to the present invention Perspective view of the main part around the idle driving prevention mechanism of the nailing machine Sectional view of the main part of the anti-missing mechanism Operation explanation diagram with the contact part pressed against the workpiece by single shot Sectional view showing the trigger pulled with a single shot Operation explanatory diagram with the trigger pulled continuously Sectional view showing the contact part pressed against the workpiece by continuous driving Operation explanatory diagram of the idle driving prevention mechanism just before the magazine runs out of staples Cross-sectional view of the position of the anti-blank pin lowered Perspective view of the main part of the idle driving prevention mechanism Sectional drawing which shows the state which pressed the contact part against the material to be driven and pulled the trigger Front view showing an empty strike prevention arm, seesaw arm and upper arm

Explanation of symbols

3 Magazine 5 Air Chamber 10 Main Valve 13 Blowing Cylinder 17 Pusher 21 Driver Guide 24 Lower Arm 25 Upper Arm 30 Blanking Prevention Arm 31 Seesaw Arm 32 Blanking Prevention Pin 33 Slider

Claims (2)

Provided with a nose part for punching fasteners at the lower part of the tool body equipped with a striking mechanism driven by air pressure, a magazine for pressing the fasteners with a pusher to the nose part, and a contact part slidable along the nose part, The lower end of the contact part protrudes from the tip of the nose part, a lower arm is provided at the upper end, and the upper arm can be engaged with a contact lever provided on the upper part of the lower arm so as to be rotatable. In the pneumatic tool provided to enable the triggering operation only when the upper arm sufficiently pushes up the contact lever and activates the striking mechanism,
A blanking prevention arm is arranged horizontally between the upper arm and the lower arm, and one end of the blanking prevention arm is provided to be engageable with the upper arm, and the other end is rotated up and down on a spindle provided on the tool body. Support as possible,
An intermediate part of the seesaw arm is swingably provided on the rotation shaft of the intermediate part of the idle arm, and one end of the seesaw arm is provided to be engageable with the lower arm.
While engaging the other end of the seesaw arm with the upper end of the anti-blank pin provided on the tool body,
The lower part of the anti-punch pin is slidable in the horizontal direction and is supported by the upper part of the slider that can be slid in the horizontal direction in conjunction with the pusher for pressing the fastener when the last fastener in the magazine is gone. A pneumatic tool characterized in that it is disengaged from the hit prevention pin.   The pneumatic tool according to claim 1, wherein the trigger is provided with a switching mechanism between continuous and single shots.

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