JP3825866B2 - Trigger device for fixing tool driving machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fastener driving machine such as a nail driver, and more particularly to a trigger device in a fastener driving machine.
[0002]
[Prior art]
A trigger lever whose base is pivotally supported by the main body of the fastener driving machine, and a trip lever that is pivotally supported at the tip of the trigger lever and extends toward the base of the trigger lever so that the valve pin of the trigger valve can be pressed And a safety arm that extends from the tip of the nose of the fixing tool driving machine to the vicinity of the trigger lever, and does not hold the trip lever in the effective operating position for pressing the trigger valve pin unless the tip of the nose is pressed against the object to be driven. A triggering device for a fastener driving machine having the following is known. The safety arm is provided in order to prevent an accident in which the fixing tool is driven out in a state where the nose of the driving machine is not pressed against the object into which the fixing tool is driven. The safety arm extends from the tip of the nose of the driving machine to the vicinity of the trigger lever. The tip of the trigger lever moves to the trigger lever when the nose of the driving machine is pressed against an object such as a panel, and the trip lever is Hold in the effective operating position to enable operation of the trigger device.
[0003]
In a driving machine having such a safety arm, there are two driving methods using the function of the safety arm. That is, there is a method of driving one by one each time the trigger lever is pulled, which is generally called single shot, and a method of driving each time the safety arm is pressed, called continuous stroke. For single shots, press the nose tip against the object to be driven, pull the trigger lever, drive the rod-shaped striking member to drive a fixture such as a nail into the object to be driven, and then release the trigger lever. Release the nose pressure and drive a nail, etc., once each time the trigger lever is pulled. In the continuous driving, the tip of the nose is pressed to a predetermined position of the driving object with the trigger lever pulled. In this case, since the trigger lever is pulled in advance, a nail or the like can be driven each time the tip of the nose is pressed, and a number of fixing tools can be driven continuously only by pressing. This continuous driving is frequently used because the driving time can be shortened. However, in the case where the nose is once pushed away from the driving object and immediately pressed against the driving object by the reaction when the driving object cannot absorb the vibration at the time of driving, the striking member is There is a risk that after returning, the next nail or the like will be driven into the same location. This may damage the object to be driven in, or a nail or the like may be clogged in the tool, and it may take time to repair the tool, or even use the tool. For this reason, continuous driving and single shot are selected according to the object to be driven and the situation of the work.
[0004]
As described above, it is possible to select single shots and continuous shots using the safety arm, but work efficiency is important for continuous shots. Emphasized. However, even if it is a single shot, if the object to be driven is fairly hard, even if it is instantaneous, the nose is lifted away from the object to be driven. Sometimes This is not preferable because it results in the same result as double hitting in continuous hitting. That is, there is a risk of double shots as in the case of single shots or continuous shots. In order to prevent such double hitting in a single shot, there is a trigger device that adjusts the pulling length of the trigger lever to adjust the pushing length of the valve pin of the trigger valve. Although this trigger device can prevent a double hitting problem in a single shot, if the safety arm is operated after pulling the trigger lever, the fixing tool is fired once. In the case of a single shot, even if the trigger lever is pulled before the operation of the safety arm, the fastener should not be fired, so the single shot operation of the trigger device is incomplete.
[0005]
Japanese Patent Application Laid-Open No. 3-111179 discloses a fixing tool driving machine that prevents double hits in single shots to make single shots more reliable and improves safety. The trigger device described in Japanese Patent Laid-Open No. 3-111179 is provided with a moving means for shifting a shaft portion for pivotally supporting the trigger lever toward the tip of the trigger lever by a predetermined length. Every time the nose tip is pressed against the object to be driven while the trigger lever is pulled, only when the fixing tool is driven and when the nose tip is pressed against the object and the trigger lever is pulled. It is driving | operation driving | operation switching means which switches the single-shot driving | operation operation | movement which drives a fixing tool. In particular, in the single shot operation position where the support shaft of the trigger lever is moved toward the tip of the trigger lever, the trip lever moves to the ineffective operating position when the nose is released while the trigger lever is pulled. Prevents double shots in a single shot. In this trigger device, even if the safety arm is operated after pulling the trigger lever, the fixing tool is not fired, and the single shot operation is reliably performed.
[0006]
[Problems to be solved by the invention]
However, in the trigger device described in the above publication, the entire trigger lever moves because the shaft portion that is the pivot center of the trigger lever moves. For this reason, every time the operator switches between the single driving operation and the continuous driving operation, the operator feels uncomfortable, and the driving operation may be out of order. In addition, the position of the trip lever also moves with the movement of the trigger lever and the turning range of the trip lever changes, so that the position with respect to the valve pin to be driven changes relatively. The configuration for coping with this change requires that the dimensional accuracy of each member be strict, and the assembly accuracy is also strict. Furthermore, when performing a single shot operation, when the tip of the nose is pressed against the object to be driven after the trigger lever has been pulled first, there is no driving of the fixing tool, but the tip of the nose is pressed against the object to be driven. It was found that even if the trigger lever is released and the trigger lever is pulled again, the fixing tool cannot be driven. Therefore, not only the release of the trigger lever but also the trouble of separating the nose tip from the object to be driven and starting the driving operation from the beginning.
[0007]
Accordingly, an object of the present invention is to not only perform the single driving operation reliably but also move the turning center of the trigger lever in the fixing device driving machine capable of switching between the continuous driving operation and the single driving operation. The object of the present invention is to solve the problem of the trigger device.
[0008]
[Means for solving the problems]
  In order to solve the above-described problems, the present invention provides a trigger lever whose root is pivotally supported on the main body of the fixing tool driving machine, and a trigger that is pivotally supported on the distal end side of the trigger lever so that the valve pin of the trigger valve can be pushed in. The trip lever that extends toward the base of the lever and the tip of the nose of the fastener driving device extends to the vicinity of the trigger lever, and unless the tip of the nose is pressed against the object to be driven, push the trip lever against the trigger valve pin. A safety arm that is not held in the effective operating position where it can be inserted, and a continuous driving operation that drives the fixing tool each time the tip of the nose is pressed against the object to be driven while the trigger lever is pulled, and the tip of the nose is pressed against the object to be driven. And a trigger driving device for a fixing tool driving machine having a driving operation switching means for switching between a single shot operation for driving the fixing tool only when the trigger lever is pulled. The driving operation switching means is composed of a driving operation switching lever supported on a turning shaft extending substantially parallel to the shaft portion in the driving machine main body close to the shaft portion of the trigger lever, and the driving operation switching lever is A continuous driving operation portion extending from the swivel shaft so as to engage with the tip of the safety arm and the tip of the trip lever; and the safety arm from the swivel shaft aligned with the continuous driving operation portion in the axial direction of the swivel shaft. A single-shot driving portion that extends to engage the tip of the trip lever and the tip of the trip lever, but is shorter than the continuous driving portion, and further, the driving operation switching lever is arranged in the axial direction of the pivot shaft. Selection means for selectively supporting at a continuous driving operation position for enabling the continuous driving operation portion by moving to a single driving operation position for enabling the single driving operation portion or the single driving operation portion is provided.And the tip of the continuous driving portion is in a position where the tip of the safety arm can be engaged with the tip of the trip lever so that the movement of the tip of the safety arm is transmitted to the tip of the trip lever, and the trigger lever is When the tip of the nose is pressed against the object to be driven while being pulled, the valve pin of the trigger valve is driven, and when the trigger lever is pulled while the tip of the nose is pressed against the object to be driven, the valve pin is driven. Thus, the tip of the single shot operation portion is formed at a position where it can be engaged with the tip of the safety arm, and the trigger lever is pulled with the safety arm pressing and engaging the tip of the single shot operation portion. Only when operated, the valve pin is driven only when the trigger lever is pulled while the tip of the nose is pressed against the object to be driven. The length of the single driving operation part is formed so that the tip of the safety arm presses the single driving operation part when the tip of the nose is pressed against the target after the trigger lever is pulled. Even if engaged, the part does not engage with the trip lever, and when the trigger lever is released with the tip of the nose pressed against the object to be driven, the trip lever moves past the tip of the single shot operation part. The length of the valve can be swung to the valve pin side.Furthermore, when the trip lever is swung, the tip of the single-stroke operation part is engaged with the tip of the swivel lever by re-pulling the trigger lever. Is the length that can be driven,There is provided a trigger device for a fastener driving machine characterized by the above.
[0009]
  As described above, in the trigger device according to the present invention, since the support shaft portion of the trigger lever remains fixed, even when switching between the continuous driving operation and the single driving operation, there is no sense of incongruity in the operation feeling. The turning range of the trip lever for driving may change.TheWhen performing a single shot operation, when the tip of the nose is pressed against the object to be driven after pulling the trigger lever first, the trigger lever is released while the tip of the nose is pressed against the object to be driven, and the trigger lever is again When you pull theIn continuous driving operation, when the tip of the nose is pressed against the object to be driven while the trigger lever is pulled, the valve pin of the trigger valve is driven to drive the fixing tool, and the object of the nose is driven Even if the trigger lever is pulled while pressed, the valve pin is driven and the fixing tool can be driven, and continuous driving operation can be ensured. In single driving operation, the tip of the nose is driven. Since the valve pin is driven only when the trigger lever is pulled while pressed against an object, a single shot operation can be performed reliably. In this single shot operation, the tip of the nose is driven after the trigger lever is pulled first. When pressing against the object to be inserted, the fixing tool is driven into the object by releasing the trigger lever and pulling the trigger lever again with the tip of the nose pressed against the object to be driven. No longer need the trouble of positioning once again to release the nose from the object to the person.
[0013]
  Claim2In the trigger device according to claim 1, the selection means drives the driving operation switching lever in the axial direction of the pivot axis so as to move between the continuous driving operation position and the single driving operation position. It is formed of a rod-shaped selection member slidably provided on the main body of the machine, and the rod-shaped selection member is engaged with a holding means for holding the driving operation switching lever at the selected position. Can be switched by a simple operation of sliding the rod-shaped selection member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. First, referring to FIG. 1, a nailing machine 1 as an example of a fixing tool driving machine includes a main body 2 having a cylinder therein, and a handle 3 is attached integrally with the main body 2. As is well known, a cylinder for supporting a striking member 5 for driving a fixing tool (a nail in this example) is accommodated in a cylinder in the main body 2 so as to be slidable in the vertical direction of FIG. A nose 6 is provided at the tip (lower end) of the main body 2, and the striking member 5 moves through the nose 6, and drives a nail fed to the nose 6 into the object from the tip of the nose 6. The handle 3 supports a magazine 7 that accommodates a nail connection body, which is an example of a fixture, in a coil shape. Nails are fed into the nose 6 from the magazine 7 by a feeding mechanism. Since these mechanisms are well known, further detailed description is omitted.
[0015]
As shown in detail in FIGS. 2 and 3, the handle 3 is provided with a trigger device 9 for controlling the driving of the striking member 5. The trigger device 9 includes a trigger valve 10 provided on the handle 3 and a trigger lever 11 whose root is pivotally supported on the main body 2. Basically, the trigger valve 9 is operated by operating the trigger lever 11. The driving and returning of the striking member 5 are controlled by sending pressurized air from 10 to the main valve on the top of the main body 2 or exhausting the pressurized air. In addition, a safety mechanism is provided to prevent the nail from being driven when the nose of the nailing machine is not pressed against the driving object. The mechanism is pivotally supported on the distal end side of the trigger lever 11 and extends toward the root portion of the trigger lever 11 so that the valve pin 13 of the trigger valve 10 can be pressed, and the trigger lever from the distal end portion of the nose 6. And a safety arm 15 that extends to 11 and does not hold the trip lever 14 in the effective operating position for pushing up the trigger valve pin 13 unless the tip of the nose is pressed against the object to be driven. The pivot pin 17 of the trip lever 14 is provided with a spring 18 that lightly biases the tip of the trip lever 14 upward, and the other side of the spring 18 abuts against the inner wall of the finger contact portion of the trigger lever 11. ing. Accordingly, the tip end side of the trip lever 14 is always in light contact with the valve pin 13. In addition, by the action of the spring 18, the trigger lever 11 turning around the pivot shaft 19 of the main body 2 is urged clockwise in FIGS. Located below. A coil spring 21 is provided between the upper end side of the safety arm 15 and the main body 2 to urge the safety arm 15 downward, and the force for pushing up the safety arm 15, that is, the tip of the nose 6 is driven. As long as the pressing force is not applied to the safety arm 15, the safety arm 15 is in the lowered position shown in FIGS. The valve pin 13 is provided with a coil spring 13a, which normally urges the valve pin 13 to be pushed downward.
[0016]
The trigger device 9 includes a continuous driving operation in which a nail is driven each time the tip of the nose 6 is pressed against the driven object while the trigger lever 11 is pulled, and the tip of the nose is pressed against the driven object and There is provided driving operation switching means for switching between a single driving operation of driving the fixing tool only when the trigger lever 11 is pulled. In the present invention, the driving operation switching means is pivotally supported on a pivot shaft 22 extending substantially parallel to the shaft portion 19 at a position close to the pivot shaft portion 19 of the trigger lever 11 of the nail driver main body 2. The driving operation switching lever 23 is provided. The driving operation switching lever 23 is supported not only to be able to turn on the turning shaft 22 but also to be slidable in the axial direction of the turning shaft 22. As described above, the driving operation switching lever 23 switches between the continuous driving operation and the single driving operation. For this purpose, the driving operation switching lever 23 has a continuous driving operation portion 25 and a single driving operation portion 26. In this embodiment, both portions 25 and 26 are integrally formed. The continuous driving operation portion 25 is formed to extend from the turning shaft 22 so as to be engaged with the distal end 27 of the safety arm 15 and the distal end 29 of the trip lever 14. The single driving operation portion 26 is formed side by side with the continuous driving operation portion 25 as viewed in the axial direction of the pivot shaft 22, and extends from the pivot shaft 22 to engage with the safety arm tip 27 and the trip lever tip 29. However, it is shorter than the continuous driving operation portion 25. That is, the continuous driving operation portion 25 is longer than the single driving operation portion 26 by the protruding portion 30. The turning shaft 22 of the driving operation switching lever 23 is provided with a spring 22a, which urges the distal end side portion of the lever 23 to be pressed against the distal end 27 side of the safety arm 15. .
[0017]
More specifically, the continuous driving operation portion 25 is located at a position where the protruding portion 30 at the tip can be engaged with the safety arm tip 27 and the trip lever tip 29 so as to transmit the upward movement of the safety arm 15 to the trip lever 14. is there. Therefore, when the tip of the nose 6 is pressed against the object to be driven while the trigger lever 11 is held, the protruding portion 30 of the continuous driving operation portion 25 pushed up by the arm tip 27 is triggered via the trip lever 14. The valve pin 13 of the valve 10 is driven. Further, even when the trigger lever 11 is pulled while the tip of the nose is pressed against the driving object, the valve pin 13 is driven in the same manner.
[0018]
The tripping lever 14 is short only when the trigger lever 11 is pulled and operated in a state where the distal end of the single-stroke driving portion 26 can be engaged with the safety arm tip 27 and pressed by the safety arm tip 27. It is in the position engaged with the front-end | tip 29 of. Accordingly, the valve pin 13 is driven only when the trigger lever 11 is pulled while the tip of the nose 6 is pressed against the driving object. The length of the single driving operation portion 26 is such that when the tip of the nose is pressed against the driving object after the trigger lever 11 has been pulled first, the tip 29 of the trip lever 14 is not engaged, When the rear trigger lever 11 is released, the trip lever 14 is short enough to pivot toward the valve pin 13 beyond the tip of the single shot operation portion, but can engage with the tip of the trip lever after the pivot. It is formed in length. Therefore, the tip of the single shot operation portion 26 can be engaged with the tip 29 of the trip lever 14 so as to drive the valve pin 13 by re-pulling the trigger lever 11.
[0019]
Further, there is provided selection means for selectively enabling the continuous driving operation portion 25 or the single driving operation portion 26 by sliding the driving operation switching lever 23 along the turning shaft 22. This selection means comprises a rod-shaped selection member 31 slidably provided on the main body 2. The selection member 31 is provided on the main body 2 so as to slide adjacent to the pivot shaft 22 and parallel to the pivot shaft 22. The selection member 31 is formed with a recess 34 that receives the protrusion 33 at the base of the driving operation switching lever 23, and the selection member 31 slides the driving operation switching lever 23 in the axial direction of the turning shaft 22. It is connected to a driving operation switching lever 23 so that it can slide. As a result, the driving operation switching lever 23 is moved in the axial direction of the pivot shaft 22 so that the continuous driving operation portion 25 can be engaged with the tip 29 of the trip lever 14 and the single driving operation portion 26. Can be moved between a single driving operation position that can be engaged with the tip 29 of the trip lever 14. For example, when the selection member 31 is slid in the direction of the arrow 35 in FIG. 2, the driving operation switching lever 23 is in a continuous driving operation position that enables the continuous driving operation portion 25. When the selection member 31 is slid in the direction of the arrow 37 in FIG. 3, the driving operation switching lever 23 becomes a single driving operation position in which the single driving operation portion 26 is made effective. Further, as shown in FIG. 2, the rod-shaped selection member 31 is provided with means for holding the driving operation switching lever 23 at a selected position (continuous driving operation position or single driving operation position). . In the illustrated embodiment, incisions 38 and 39 are formed at positions corresponding to the continuous driving operation position and the single driving operation position of the selection member 31, and a ball 41 and a ball 41 engaged with these cuttings are provided. Ball click means comprising a spring 42 that presses in the direction of the cuts 38 and 39 is provided on the side of the main body 2.
[0020]
The operation will be described first with reference to FIGS. 4 (a) to (e) and FIGS. 5 (a) to (e). In the case of continuous driving operation, the rod-shaped selection member 31 is pressed in the direction of the arrow 35 in FIG. 2, and the driving operation switching lever 23 makes the continuous driving operation portion 25 effective as shown in FIG. Into the inset position. Therefore, in FIGS. 4 and 5, only the continuous driving operation portion 25 of the driving operation switching lever 23 is shown. FIG. 4 (a) shows the initial state of the continuous driving operation. In this initial state, the distal end (projecting portion 30) of the continuous driving operation portion 25 is engaged with the distal end (27) of the safety arm 15, and the distal end (29) of the trip lever 14 is in contact with the valve pin 13 of the trigger valve. Yes. 4 (b) to 4 (e) show a continuous driving operation in which the tip of the nose 6 is pressed against or released from the driving object while the trigger lever 11 is pulled, and the safety arm 15 is pushed up and returned. Is shown. When the trigger lever 11 is pulled in (b) and the safety arm 15 is pushed up in (c), this push-up movement turns the continuous driving operation portion 25 counterclockwise, and this continuous driving operation portion. The tip of the trip lever 14 is pressed by the protruding portion 30 of 25, and the trip lever 14 rotates clockwise about the pivot pin 17 to drive the valve pin 13. As a result, compressed air is supplied to the back surface of the main piston of the main body 2 in FIG. 1, and the striking member 5 strikes the nail from the nose 6 and drives it into the object to be driven. In FIG. 4 (d), when the tip of the nose is moved away from the object to be driven and the safety arm 15 is returned downward, the continuous driving operation part 25 is also rotated clockwise by the spring 22a (see FIG. 3) and tripped. The lever 14 is no longer pressed, the valve pin 13 returns, and the striking member 5 returns. In (e), when the safety arm 15 is pushed up again, the continuous driving operation portion 25 rotates again counterclockwise, the tip of the trip lever 14 is pressed to drive the valve pin 13, and the striking member 5 is nail. Type. In this way, a continuous driving operation is performed by pressing or releasing the tip of the nose against the driving object while the trigger lever 11 is being pulled.
[0021]
FIGS. 5A to 5E show a continuous driving operation in which the trigger lever 11 is pulled or released with the nose tip pressed against the driving object. FIG. 5 (a) shows the same initial state as FIG. 4 (a). In FIG. 5 (b), the tip of the nose is pressed against the object to be driven, the safety arm 15 is pushed up, the continuous driving operation portion 25 is turned counterclockwise, and the tip is engaged with the tip of the trip lever 14. Let Next, when the trigger lever 11 is pulled in (c), the trip lever 14 turns upward clockwise around the tip engaged with the continuous driving operation portion 25 to drive the valve pin 13. As a result, the striking member 5 is driven and the nail is driven out of the nose 6 and driven into the object to be driven. In (d), when the trigger lever 11 is released, the trip lever 14 descends and returns to the same state as in (b), the trip lever 14 is not pressed, the valve pin 13 returns, and the striking member 5 returns. In (e), when the trigger lever 11 is pulled again, the trip lever 14 is raised again, the valve pin 13 is driven, and the striking member 5 drives the nail. In this manner, the continuous driving operation is performed by pulling or releasing the trigger lever while the nose tip is pressed against the driving target.
[0022]
The single shot driving operation will be described with reference to FIGS. 6 (a) to (f) and FIGS. 7 (a) to (e). In the case of a single shot operation, the rod-shaped selection member 31 is pressed in the direction of the arrow 37 in FIG. 3, and as shown in FIG. 3, the drive operation switching lever 23 makes a single shot operation portion 26 effective. Into the inset position. Therefore, in FIGS. 6 and 7, only the shorter one-shot driving operation portion 26 of the driving operation switching lever 23 is shown. 6 (a) and 7 (a) both show the initial state of the single shot operation. In this initial state, the tip of the single driving operation portion 26 is engaged with the tip of the safety arm 15 and is far away from the trip lever 14. The trip lever 14 is in contact with the valve pin 13.
[0023]
The single driving operation is an operation of driving a fixing tool such as a nail only when the nose tip is pressed against an object to be driven and the trigger lever is pulled. First, in FIG. 6B, the nose 6 of the nailing machine 1 is pressed against the object to be driven, the safety arm 15 is lifted up, and the single driving operation portion 26 is turned counterclockwise. Let However, since the single driving operation portion 26 is short, the tip of the single driving operation portion 26 is not engaged with the tip of the trip lever 14 in this state. Next, when the trigger lever 11 is pulled in (c), the trigger lever 11 turns around the pivot shaft 19, and the entire trip lever 14 turns along with the turning. The tip of 14 engages with the tip of the single shot operation portion. By continuing the turning of the trigger lever 11, the trip lever 14 engaged with the tip of the single driving operation portion is turned up counterclockwise around the tip portion engaged with the single driving operation portion, and the valve pin 13 As a result, the striking member 5 is driven, and one nail is driven out of the nose 6 and driven into the object to be driven. Next, when the tip of the nose is moved away from the object to be driven, the safety arm 15 moves downward, and the single driving operation portion 26 also turns clockwise. By this turning, the engagement with the tip of the trip lever 14 is released, and the valve pin 13 returns downward together with the trip lever 14 by the pressing force of the coil spring 13a of the valve pin 13, and the striking member 5 also returns. When the trigger lever 11 is released from this state as shown in (e), the initial state of (a) is obtained. However, there is a case where the nose is once pushed away from the object to be driven and immediately pressed against the object to be driven by reaction or the like when the nail is driven. (f) shows the re-pressing. Even if the safety arm 15 is pushed up by re-pressing the nose while the trigger lever 11 is pulled and the single-shot driving portion 26 turns counterclockwise, as shown in FIG. The tip of the trip lever 14 is positioned below the tip of the single shot operation portion 26, and the single shot operation portion 26 is not engaged with the trip lever 14, so that the nail is not fired. That is, the single shot driving operation is surely guaranteed.
[0024]
Next, the case where the trigger lever 11 is first pulled as shown in FIG. 7 (b) from the initial state of FIG. 7 (a) in the single shot operation will be described. In (b), when the trigger lever 11 is pulled, the trigger lever 11 turns around the shaft portion 19 and the entire trip lever 14 tries to turn along with the turning. The trip lever 14 is pushed down by the lowering force. Next, in (c), when the nose is pressed against the driving object and the safety arm 15 is pushed up, the single driving operation portion 26 turns counterclockwise. Since the single shot operation portion 26 is formed short as described above, the tip of the single shot operation portion 26 moves upward beyond the trip lever 14 without being engaged with the tip of the trip lever 14. Therefore, the valve pin 13 of the trigger valve is not driven and the nail is not driven. This prevents inadvertent nail firing (i.e., misfiring) when the tip of the nose is pressed against something with the trigger lever pulled first.
[0025]
(a) (b) (c) (d) (e) (f)
In a state where the tip of the nose is properly pressed against the object to be driven, it is desirable that a single driving operation can be performed only by operating the trigger lever while maintaining the pressing. In the present invention, instead of changing the pivotal support position of the trigger lever, the main body 2 is provided with a driving operation switching lever 23 for associating the safety arm and the trip lever, and the single driving operation portion 26 of the driving operation switching lever 23 is provided. As described above, it is possible to perform single shot operation only by operating the trigger lever even when the tip of the nose is pressed against the driven object at the single shot operation position. Yes. After the nose tip of FIG. 7 (c) is pressed against the object to be driven, as shown in FIG. 7 (d), when the trigger lever 11 is released, it turns to return to the original position. By this turning, the trip lever 14 also moves together, and the tip of the trip lever contacts the valve pin 13 at a position beyond the tip of the single shot operation portion 26. Thereafter, as shown in (e), when the trigger lever 11 is pulled again, the trigger lever 11 turns about the shaft portion 19, the entire trip lever 14 also turns, and the tip of the trip lever 14 is driven once. Engage with the tip of the moving part. If the turning of the trigger lever 11 is continued, the trip lever 14 engaged with the tip of the single driving operation portion is turned up counterclockwise around the tip portion engaged with the single driving operation portion 26, The valve pin 13 is driven, the striking member 5 is driven, and one nail is driven into the driving object. Therefore, a single driving operation can be performed by an operation of pulling or releasing the trigger lever while the nose tip is pressed against the driving object.
[0026]
【The invention's effect】
According to the present invention, in the fastener driving machine capable of switching between the continuous driving operation and the single driving operation, the single driving operation can be reliably performed, and the support shaft portion of the trigger lever is fixed. Therefore, the entire trigger lever is not moved, and even if switching between continuous driving operation and single driving operation, there is no sense of incongruity in the operation feeling, and the turning range of the trip lever for driving changes. I don't have to. Further, the continuous driving operation can be performed reliably, and the single driving operation can also be performed reliably. Furthermore, when performing a single driving operation, double driving can be reliably prevented, and when the nose tip is pressed against the driving object after pulling the trigger lever first, the nose tip is driven into the driving object. When the trigger lever is released and the trigger lever is pulled again while being pressed, the fixing tool can be hit once. Therefore, the operator does not have to reposition the nose to the object away from the object.
[0027]
Then, the operation position selection means of the driving operation switching lever moves the driving operation switching lever in the axial direction of the pivot axis between the continuous driving operation position and the single driving operation position. The rod-like selection member slidably provided on the driving machine body can be formed, and the driving operation can be switched by a simple operation by simply sliding the rod-like selection member.
[Brief description of the drawings]
FIG. 1 is a front view in which a part of a nail driver showing an embodiment of the present invention is cut away.
FIG. 2 is a cutaway perspective view of the trigger device of the nail driver of FIG. 1 in the continuous driving operation position.
3 is a perspective view of the trigger device of FIG. 2 in a single shot operation position. FIG.
4 is an explanatory diagram showing an operation sequence when the nose is pressed against an object to be driven after the trigger lever is pulled in the continuous driving operation of the trigger device of FIG. 2;
FIG. 5 is an explanatory diagram showing an operation sequence when the trigger lever is pulled after the nose is pressed against the object to be driven in the continuous driving operation of the trigger device of FIG. 2;
6 is an explanatory diagram showing an operation sequence when the trigger lever is pulled after the nose is pressed against the object to be driven in the single driving operation of the trigger device of FIG. 3;
7 is an explanatory diagram showing an operation sequence when the nose is pressed against a driving object after the trigger lever is pulled in the single driving operation of the trigger device of FIG. 3;
[Explanation of symbols]
1 Nailer as a fastener driving machine
2 Nailer body
3 Handle
5 striking members
6 Nose
7 Magazine
9 Trigger device
10 Trigger valve
11 Trigger lever
13 Valve pin
14 Trip lever
15 Safety arm
17 pivot pin
18 Spring
19 Trigger lever pivot shaft
22 Pivot axis of driving operation switching lever
23 Driving operation switching lever
25 Continuous driving part
26 Single shot operation part
30 Protruding part
31 Bar-shaped selection member
38, 39 Cutting of selected member
41 balls

Claims (2)

A trigger lever whose root is pivotally supported by the main body of the fastener driving machine, and a trip lever that is pivotally supported at the tip of the trigger lever and extends toward the root of the trigger lever so that the valve pin of the trigger valve can be pushed in. And a safety arm that extends from the tip of the nose of the fixing tool driving machine to the vicinity of the trigger lever, and does not hold the trip lever in the effective operating position for pressing the trigger valve pin unless the tip of the nose is pressed against the object to be driven. When the trigger lever is pulled and the nose tip is pressed against the object to be driven, the sticking tool is continuously driven and the nose tip is pressed against the object and the trigger lever is pulled. In a trigger device for a fixing tool driving machine having a driving operation switching means for switching between a single shot operation for driving only the fixing tool,
The driving operation switching means comprises a driving operation switching lever supported so as to be able to turn on a turning shaft extending substantially parallel to the shaft portion in the driving machine main body close to the shaft portion of the trigger lever,
The driving operation switching lever includes a continuous driving operation portion extending from the pivot shaft so as to be engaged with a tip of a safety arm and a tip of a trip lever, and the continuous driving operation portion in the axial direction of the swing shaft. A single driving operation portion that extends from the swivel axis to engage with the tip of the safety arm and the tip of the trip lever, but is formed shorter than the continuous driving operation portion;
Further, the driving operation switching lever is moved in the axial direction of the pivot axis to enable the continuous driving operation portion or the single driving operation position to enable the single driving operation portion. Is provided with a selection means for selectively supporting ,
The tip of the continuous driving operation portion is positioned to be able to engage the tip of the safety arm and the tip of the trip lever so that the movement of the tip of the safety arm is transmitted to the tip of the trip lever, and the trigger lever is pulled. The valve pin of the trigger valve is driven when the tip of the nose is pressed against the driving object while the valve pin is driven when the trigger lever is pulled while the tip of the nose is pressed against the driving object. Formed,
The trip lever is only when the tip of the single driving operation portion can be engaged with the tip of the safety arm and the trigger is pulled with the safety arm pressing and engaging the tip of the single driving operation portion. Is formed so that the valve pin is driven only when the trigger lever is pulled while the tip of the nose is pressed against the object to be driven.
The length of the one-shot driving operation portion is such that when the tip of the nose is pressed against the driving object after the trigger lever is pulled, even if the tip of the safety arm presses and engages the one-shot driving operation portion. Does not engage with the trip lever, and when the trigger lever is released with the tip of the nose pressed against the object to be driven, the trip lever can be turned to the valve pin side beyond the tip of the single-shot driving part. Further, the length of the valve lever can be driven by engaging the tip of the tripping lever with the tip of the single driving operation portion by re-pulling the trigger lever with the trip lever turning. Is,
A triggering device for a fastener driving machine characterized by that. The trigger device according to claim 1, wherein
The selection means is slidable to the driving machine main body so as to move the driving operation switching lever in the axial direction of the pivot axis between the continuous driving operation position and the single driving operation position. The bar-shaped selection member is formed by a holding member that holds the driving operation switching lever at the selected position.
A trigger device characterized by that.

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