JP4752751B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine for driving a stopper such as a nail or a staple by a piston that operates using compressed air as a driving source.

  A pneumatic nailing machine as one type of driving machine includes a piston that drives a stopper by operating with compressed air as a driving source, a trigger valve that controls reciprocation of the piston, and a plunger of the trigger valve. An actuating trigger arm, a trigger that rotatably supports the trigger arm, and a push lever that is biased toward the bottom dead center and selectively abuts against the trigger arm. This is a tool for driving the piston into the material to be driven by driving the piston by cooperation of the contact operation and the pulling operation of the trigger.

  By the way, in such a pneumatic nailing machine, the nailing operation is not started only by the pulling operation of the trigger, but only when both the pulling operation of the trigger and the pushing operation of the push lever against the driven material are performed. The trigger valve is activated to start the nailing operation.

  Thus, in the nailing operation, when both operations are performed regardless of the order of the pushing operation of the push lever to the material to be driven and the pulling operation of the trigger, the single-shot / repetitive driving for starting the trigger valve, Only when the trigger is pulled after the push lever is pressed against the workpiece, the trigger valve is activated only once, and then the trigger is triggered even when the push lever is pressed against the workpiece again with the trigger pulled. There is a complete single shot that does not start the valve.

  Here, the operation of the push lever and the trigger in the case of performing single shot / sequential shot will be described based on the partial cross-sectional views of FIGS. 8A to 8C and FIGS. 9A to 9C (for example, patents) Reference 1).

  In the initial state before the start of the nail operation, as shown in FIGS. 8A and 9A, the push lever 122 is urged in the direction of the bottom dead center and is positioned below the drawing, and the trigger 106 is in an open state that has not yet been pulled, and a trigger arm 126 that is pivotally connected thereto is spaced from the plunger 107 of the trigger valve 108. Therefore, in this state, the trigger valve 108 is not activated and the nail driving operation is not started. In this initial state, the tip (upper end) of the push lever 122 is in contact with the trigger arm 126 as shown.

  Thus, if the push lever 122 is pressed against the workpiece (not shown) from the initial state, the push lever 122 moves in the direction of the top dead center (upward in the figure) as shown in FIG. Then, the trigger arm 126 is pushed up, and the trigger arm 126 is rotated around the arm pin 127 in the illustrated arrow direction (clockwise direction) to approach the plunger 107 of the trigger valve 108. In this state, the trigger 106 is pulled as shown in FIG. 8C, and if the trigger 106 is rotated about the trigger pin 125 in the direction indicated by the arrow (counterclockwise), the trigger arm 126 is moved together therewith. However, the plunger 107 of the trigger valve 108 is pushed up to activate the trigger valve 108, and a piston (not shown) is driven to start driving a nail.

  On the other hand, if the trigger 106 is pulled from the initial state as shown in FIG. 9B and the trigger 106 is rotated about the trigger pin 125 in the direction indicated by the arrow (counterclockwise), the trigger arm 126 is moved together therewith. Approaches the plunger 107 of the trigger valve 108. Then, if the push lever 122 is pressed against the workpiece not shown from that state, the push lever 122 moves in the direction of the top dead center (upward in the figure) as shown in FIG. In order to push up the trigger arm 126 at the tip and rotate it around the arm pin 127 in the illustrated arrow direction (clockwise), the trigger arm 108 pushes up the plunger 107 of the trigger valve 198 to activate the trigger valve 108, A piston (not shown) is driven to start driving a nail.

As described above, in the single shot and the continuous shot, the trigger valve 108 is activated when both operations are performed regardless of the order of the pushing operation of the push lever 122 to the workpiece and the pulling operation of the trigger 106. The nailing operation is started.
JP 2006-231519 A

  By the way, in order to be able to aim at the exact point of the material to be driven, it is necessary to start the nail driving operation by pulling the trigger unless the push lever is first pressed against the material to be driven. There are pneumatic nailers that cannot be completely single shot. More specifically, this completely single-pneumatic nailing machine activates the trigger valve only once when the trigger is pulled after the push lever is pressed against the workpiece, and then the trigger is triggered. The trigger valve is configured not to be activated even when the push lever is pressed against the material to be driven again while pulling.

  Thus, there is a problem that the number of parts to be newly installed is increased and the mechanism is complicated in order to enable a single-shot / repetitive-type pneumatic nailing machine to be capable of complete single shot.

  The present invention has been made in view of the above-mentioned problems, and its intended process is to achieve a completely single shot specification by simply exchanging the trigger without causing an increase in the number of parts and a complicated mechanism. The object is to provide a driving machine that can be changed.

In order to achieve the above object, the invention according to claim 1 is provided with a piston that strikes a stop by operating with compressed air as a driving source, a trigger valve that controls reciprocation of the piston, and a plunger of the trigger valve. An actuating trigger arm, a trigger that rotatably supports the trigger arm, and a push lever that is biased toward the bottom dead center and selectively abuts against the trigger arm. In the driving machine for driving the piston into the driven material by driving the piston by cooperation of the contact operation and the pulling operation of the trigger,
When both operations are performed regardless of the order of the pushing operation of the push lever to the workpiece and the pulling operation of the trigger, the first trigger for single-shot and continuous firing for starting the trigger valve; The trigger valve is activated only once when the trigger is pulled after the push lever is pressed against the workpiece, and then the push lever is pushed again against the workpiece while the trigger is pulled. The second trigger for complete single shot that does not start the trigger valve even when applied can be selectively mounted.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rotation fulcrum of the second trigger is provided at a position different from the rotation fulcrum of the first trigger, and the rotation of the second trigger is performed. The push lever guide, which is a separate part from the main body, is provided with a hole for passing the moving support shaft.

  According to the first aspect of the present invention, the specification of the driving machine can be completely single shot by a simple operation which is simply replaced with the second trigger for single shot without increasing the number of parts and complication of the mechanism. Can be changed.

  According to the invention described in claim 2, since the hole for passing the rotation support shaft of the second trigger is provided in the push lever guide which is a separate part from the main body, there is no need to perform additional processing on the main body. Processing associated with changes can be minimized.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a left side view showing a part of a pneumatic nailer as a form of a driving machine according to the present invention, and FIG. 2 is a right side view of a push lever portion of the pneumatic nailer. FIGS. 3 to 6 are enlarged detail views of part A of FIG. 1 showing the action of complete single shot, and FIG. 7 is an explanatory view showing the positions of the two types of triggers attached to the push lever guide.

  A pneumatic nailer 1 shown in FIG. 1 includes a housing 2 having a substantially T shape in a side view, and an exhaust cover 3 is airtightly attached to an upper end opening of the housing 2. A pressure accumulation chamber S1 is formed in the housing 2, and an air plug 4 for connecting an air hose (not shown) is provided at the rear end of the handle portion 2a of the housing 2.

  Furthermore, the housing 2 is provided with a trigger valve 8 including a plunger 7 that can move a number of nails (not shown) and that can move up and down by a trigger 6.

  A cylinder 9 is provided in the housing 2, and a piston 10 is fitted into the cylinder 9 so as to be slidable up and down. One end of a plate-like driver blade 11 is connected to the piston 10 by a piston pin 12, and the driver blade 11 extends vertically downward in the cylinder 9. The cylinder 9 is partitioned into a piston upper chamber S2 and a piston lower chamber S3 by a piston 10, and a piston bumper 13 made of an elastic body such as rubber is provided at the bottom of the cylinder 9.

  Further, a substantially cylindrical return air chamber S4 defined by a partition wall 14 is formed in the lower half portion between the cylinder 9 in the housing 2 and constitutes a part of the return air chamber S4 of the cylinder 9. A plurality of air holes 15 and 16 are formed in the circumferential direction above and below the portion to be performed, and only the flow of compressed air from the piston upper chamber S2 toward the return air chamber S4 is allowed in the upper air hole 15. A check valve 17 is provided.

  On the other hand, a main valve 18 that comes in contact with and separates from the upper surface of the cylinder 9 is provided in the exhaust cover 3 so as to be vertically slidable. The direction is in close contact with the upper end surface). A main valve chamber S5 is defined between the main valve 18 and the exhaust cover 3, and the main valve chamber S5 communicates with the trigger valve 8 via an air passage (not shown). As will be described later, the pressure accumulation chamber S1 or the atmosphere is selectively communicated by the trigger valve 8. The exhaust cover 3 is formed with an exhaust hole 20 that opens into the atmosphere. The exhaust hole 20 is opened and closed by a main valve 18 and selectively communicated with the cylinder upper chamber S2.

  Further, a nose 21 for guiding a nail is attached to the front end portion of the housing 2, and a push lever 22 that is movable in the vertical direction along the nose 21 is provided. An injection port (not shown) for driving the nails supplied from 5 one by one is formed. The push lever 22 is guided in its vertical movement by a push lever guide 24 which is a separate part from the housing 2 which is the main body.

  By the way, as shown in detail in FIG. 3, the trigger 6 is for complete single shot, and is a separate part from the single / continuous shot trigger 106 shown in FIGS. In other words, the pneumatic nailing machine 1 according to the present embodiment can replace two types of parts, that is, the trigger 6 for complete single shot and the trigger 106 for single shot and continuous shot according to specifications.

  That is, as shown in FIG. 7, a small-diameter circular hole 6a is formed at one end of the trigger 6 for complete single shot, and a large-diameter circular hole 106a is formed at one end of the trigger 106 for single-shot / continuous shot. A small-diameter circular hole 24a and a large-diameter circular hole 24b are formed above and below the push lever guide 24, respectively. The trigger 6 for single shot can be turned up and down on the push lever guide 24 by a small-diameter trigger pin 25 inserted into the circular hole 6a formed in the trigger 6 and the circular hole 24a formed in the push lever guide 24. As a result, the pneumatic nailing machine 1 is changed to a specification for complete single shot driving.

  On the other hand, the single-shot / repetitive-fire trigger 106 has one end vertically moved to the push lever guide 24 by a large-diameter trigger pin 125 inserted into a circular hole 106a formed in the trigger 106 and a circular hole 24b formed in the push lever guide 24. The pneumatic nailing machine 1 is changed to a specification for single shot and continuous shot.

  Thus, as shown in FIG. 3, one end of the triggerer 26 is pivotally attached to the complete single-shot trigger 6 by the arm pin 27 so as to be vertically rotatable. The trigger arm 26 is always urged downward by a spring 28, and the other end (free end) is engaged with the upper end of the push lever 22 and the push lever guide 24 in the initial state before the start of the nail driving operation shown in FIG. As a result, the horizontal state is maintained.

  Incidentally, as shown in FIG. 2, the push lever 22 is configured by connecting an upper lever 22 </ b> A and a lower lever 22 </ b> B divided by an adjuster 29. Here, the adjuster 29 is for adjusting the driving depth of the nail by adjusting the length of the push lever 22.

  Next, the complete single shot operation performed by attaching the trigger 6 for complete single shot to the pneumatic nailer will be described. In addition, since the single shot / sequential driving work performed by attaching the trigger 106 for single shot / sequential hitting to the pneumatic nailing machine 1 has been described based on FIGS. 8 and 9, the description thereof will not be repeated.

  When an air hose (not shown) is connected to the air plug 4 shown in FIG. 1 during a nailing operation to a workpiece (not shown) such as wood, compressed air is supplied from a pressure supply source (not shown) such as a compressor through the air hose. The accumulator 1 is supplied to and accumulated in the pressure accumulating chamber S1 in the housing 2 of the hammer 1, and a part thereof flows into the main valve chamber S5 through an air passage (not shown).

  The compressed air flowing into the main valve chamber S5 causes the main valve 18 to come into close contact with the upper end surface of the cylinder 9 together with the spring 19 as shown in FIG. In order to cut off the communication and prevent the compressed air in the pressure accumulating chamber S1 from flowing into the piston upper chamber S2, the piston 10 remains stationary and no nailing operation is performed.

  By the way, in the pneumatic nail driver 1 used for complete single shot driving, the trigger valve 8 is activated only once when the trigger 6 is pulled after the push lever 22 is pressed against the workpiece. Then, the trigger valve 8 is not activated even if the push lever 22 is pressed against the material to be driven again while the trigger 6 is pulled.

  That is, in the initial state before the start of the nail driving operation, as shown in FIG. 3, the push lever 22 is urged toward the bottom dead center and is positioned below the FIG. 3, and the trigger 6 is not pulled. The trigger arm 26 that is open and pivotally connected thereto is spaced from the plunger 7 of the trigger valve 8, and its free end is the upper end of the push lever 22 and the push lever guide 24 as shown. To maintain a substantially horizontal state. Therefore, in this state, the tricker valve 8 is not activated, and the nail driving operation is not started.

  Thus, if the push lever 22 is pressed against the workpiece (not shown) from the initial state, as shown in FIG. 4, the push lever 22 moves in the top dead center direction (upward in FIG. 4), The trigger arm 26 is pushed up against the urging force of the spring 28, and is rotated around the arm pin 27 in the illustrated arrow direction (clockwise) to approach the plunger 7 of the trigger valve 8. When the trigger 6 is pulled in this state as shown in FIG. 5 and the trigger 6 is rotated about the trigger pin 25 in the direction indicated by the arrow (counterclockwise), the trigger arm 26 moves together with the push lever. Since the tip of 22 rotates in the same direction as a fulcrum, the plunger 7 of the trigger valve 8 is pushed up and the trigger valve 8 is activated.

  When the trigger valve 8 is activated as described above, the compressed air in the main valve chamber S5 is discharged to the atmosphere through an air passage (not shown). Then, the main valve 18 is pushed up by the pressure of the compressed air in the pressure accumulating chamber S1, the upper end of the cylinder 9 opens, and at the same time, the communication between the piston upper chamber S2 in the cylinder 9 and the atmosphere is cut off, and the pressure in the pressure accumulating chamber S1 is increased. Compressed air flows into the piston upper chamber S2 in the cylinder 9, and the piston 10 together with the driver blade 11 is rapidly lowered toward the bottom dead center by the pressure of the compressed air, so that the magazine 5 leads to the injection port 23 of the nose 21. The supplied nail is hit by the driver blade 11. Then, the nail hit by the driver blade 11 is guided to the injection port 23 of the nose 21 and driven into the material to be driven.

  When the piston 10 descends in the cylinder 9 and passes through the air hole 15, the compressed air in the piston upper chamber S2 flows into the return air chamber S4 through the air hole 15 and the check valve 17 and is accumulated. The Further, when the piston 10 descends in the cylinder 9 and reaches the bottom dead center, the piston 10 collides with the piston bumper 13 and elastically deforms the piston bumper 13. Therefore, surplus energy is generated by the elastic deformation of the piston bumper 13. Is absorbed.

Next, when the push lever 22 is separated from the material to be driven, as shown in FIG. 6, the distal end portion of the push lever 22 is released from the trigger foam 26 and the engagement between the two is released. With the urging force, the arm pin 27 is rotated around the arm pin 27 in the direction indicated by the arrow (counterclockwise) to move away from the plunger 7 of the trigger valve 8. As a result, the plunger 7 returns to the original state, the trigger valve 8 is turned OFF, and the compressed air in the pressure accumulating chamber S1 flows into the main valve chamber S5 through an air passage (not shown). As shown in FIG. 1, the main valve 18 comes into close contact with the upper end surface of the cylinder 9. For this reason, the communication between the pressure accumulating chamber S1 and the piston upper chamber S2 in the cylinder 9 is blocked, and the exhaust hole 20 is opened to allow the piston upper chamber S2 to communicate with the atmosphere through the exhaust hole 20. Thereby, the compressed air in the piston upper chamber S2 in the cylinder 9 is discharged from the exhaust hole 20 to the atmosphere.
Then, since the compressed air accumulated in the return air chamber S4 flows into the piston lower chamber S3 in the cylinder 9 through the air hole 16, the piston 10 receives the pressure of the compressed air on the lower surface and moves inside the cylinder 9. The piston 10 and the driver blade 11 return to the initial positions shown in FIG.

  Thus, as shown in FIG. 6, even if the push lever 22 is pressed against the material to be driven again while the trigger 6 is pulled, the engagement between the push lever 22 and the trigger arm 26 remains released. The trigger valve 8 is not activated and no nailing is performed.

  As described above, according to the present embodiment, the specifications of the pneumatic driving machine 1 can be set in a single operation by simply replacing the trigger 6 for complete single shot without increasing the number of parts or complicating the mechanism. It is possible to change from continuous firing to complete single firing, and conversely, it is possible to change from complete single firing to single / continuous firing simply by replacing the trigger 106 for single / continuous firing.

  In addition, according to the present embodiment, since the circular holes 24a and 24b for passing the trigger pins 25 and 125 of the triggers 6 and 106 are provided in the push lever guide 24 which is a separate part from the main body, additional processing is performed on the main body. There is no need, and processing associated with specification changes can be minimized.

  Although the present invention has been described with respect to a form in which the present invention is applied particularly to a pneumatic nailing machine, the present invention is not limited to any other means for driving a stopper such as a pin or staple other than a nail using compressed air as a drive source. Of course, the present invention can be similarly applied to a driving machine.

It is a left view which fractures | ruptures and shows a part of pneumatic type nailing machine which concerns on this invention. It is a right view of the push lever part of the pneumatic nailer according to the present invention. FIG. 2 is an enlarged detail view of a part A in FIG. 1 showing an operation of complete single shot. FIG. 2 is an enlarged detail view of a part A in FIG. 1 showing an operation of complete single shot. FIG. 2 is an enlarged detail view of a part A in FIG. 1 showing an operation of complete single shot. FIG. 2 is an enlarged detail view of a part A in FIG. 1 showing an operation of complete single shot. It is explanatory drawing which shows the attachment position of 2 types of triggers with respect to a push lever guide. (A)-(c) is a fragmentary sectional view which shows operation | movement of a push lever and a trigger in the case of performing single shot and continuous shot. (A)-(c) is a fragmentary sectional view which shows operation | movement of a push lever and a trigger in the case of performing single shot and continuous shot.

Explanation of symbols

1 Pneumatic nailer (driving machine)
2 Housing 2a Handle 3 Exhaust cover 4 Air plug 5 Magazine 6 Trigger (second trigger)
7 Plunger 8 Trigger valve 9 Cylinder 10 Piston 11 Driver blade 12 Piston pin 13 Piston bumper 14 Partition 15, 16 Air hole 17 Check valve 18 Main valve 19 Spring 20 Exhaust hole 21 Nose 22 Push lever 22A Push lever upper lever 22B Push Lower lever of lever 24 Trigger pin 24a, 24b Circular hole 25 Trigger pin 26 Trigger arm 27 Arm pin 28 Spring 29 Adjuster 106 Trigger (first trigger)
S1 pressure accumulation chamber S2 piston upper chamber S3 piston lower chamber S4 return air chamber S5 main valve chamber

Claims (2)

A piston that strikes a stop by operating with compressed air as a drive source, a trigger valve that controls reciprocation of the piston, a trigger arm that acts on the plunger of the trigger valve, and a trigger that rotatably supports the trigger arm A push lever that is urged toward the bottom dead center and selectively abuts against the trigger arm, and the piston is operated by cooperating the pushing operation of the push lever against the driven material and the pulling operation of the trigger. In a driving machine that drives and drives the stopper into the workpiece,
When both operations are performed regardless of the order of the pushing operation of the push lever to the workpiece and the pulling operation of the trigger, the first trigger for single-shot and continuous firing for starting the trigger valve; The trigger valve is activated only once when the trigger is pulled after the push lever is pressed against the workpiece, and then the push lever is pushed again against the workpiece while the trigger is pulled. 2. A driving machine characterized in that a second trigger for complete single shot that does not start the trigger valve even when applied can be selectively mounted.   The pivot point of the second trigger is provided at a position different from the pivot point of the first trigger, and the hole for passing the pivot axis of the second trigger is a separate part from the main body. The driving machine according to claim 1, wherein the driving machine is provided in a push lever guide.

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