JPH0616658Y2 - Nailer starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a starting device for a nailing machine such as a pneumatic nailing machine,
In particular, the nailing drive mechanism can be operated only when the contact arm is pushed up and the trigger lever is pulled up, and it is possible to switch between single shot and continuous shot. Related to the starting device.

(Prior art and its problems) In order to supply compressed air to a striking mechanism consisting of a piston and cylinder mechanism in a normal nail driving machine, a main valve is provided above the striking mechanism and this main valve is opened and closed. A starting device is provided for starting the nailer. This starting device is composed of a trigger valve, a trigger lever operated by an operator, and a contact arm which is arranged at the tip of a nail injection port of a nailing machine and is operated by being pressed against a driven member, The trigger valves are configured to be activated only when they are operated at the same time.

On the other hand, in this type of nail driving machine, so-called dribble hammering is prevented from occurring, which causes two times of nailing at the same site due to the nailing machine being lifted up due to recoil of nail driving etc. As a safety device for realizing a simple nailing, the one shown in Japanese Utility Model Publication No. 62-37659 is known.

Further, in this type of nail driving machine, depending on the work content, there is a demand for continuous hammering that prioritizes work speed and single hammering that prioritizes accurate construction. In response to this, a nailing machine shown in Japanese Utility Model Laid-Open No. 61-117680 is known as one that can be selectively used for continuous driving and single-shot driving.

Although the former technique has high safety, it is not suitable for work in which the work speed is important, and the latter technique has a risk of dribbling in a single shot setting. In other words, in the latter structure, the trigger lever and the contact arm operate regardless of which is first.Therefore, when the nailing machine bounces up due to the recoil of nailing, the fingers operating the trigger lever move and trigger A phenomenon occurs in which the lever is once released and then pulled again. In this case, the piston of the striking mechanism ascends and returns at the same time when the trigger lever is opened, and the nail is driven when the nailing machine hits the driven material again. In the former technique, such a phenomenon of dribbling does not occur because the operation order of the trigger lever and the contact arm is determined.

(Technical problem of the invention) The technical problem of the present invention is to provide a starting device of a nailing machine capable of surely preventing the occurrence of dribble hammering at the time of a single shot and switching to continuous hammering. And

(Means for Solving the Problems) In order to solve the above problems, the nailing machine activating device according to the present invention is provided when the contact lever is pushed up by pushing up the contact arm and pulling the trigger lever. When the trigger valve stem is started, the trigger lever pivots the base end to the nailing machine body, and the contact lever pivotally pivots the base end to the free end side of the trigger lever. The end is projected toward the base end of the trigger lever to face the end of the contact arm, and when only the trigger lever is pulled up to this contact lever and when the contact arm is pushed up, the trigger lever is Is pulled up to the upper end, only the contact arm is at a position where the trigger valve stem can be inserted. In a nailing machine provided with a penetrating portion opened at a position deviated from the axial direction of the trigger valve stem when a pulling operation is performed, in the contact lever, a block member is provided between the base end and the free end of the contact lever. The block member is slidably provided between the first position and the second position, and the block member has the first position.
Position, at least a portion of the block member is arranged so as to be able to contact the trigger valve stem by closing the penetrating part formed in the contact lever, and the block member is arranged to contact the trigger valve stem in the second position. It is characterized in that it is arranged so as to release the penetrating portion of the contact lever.

(Embodiment) An embodiment of the present invention will be described below.

FIG. 1 is a schematic view of a pneumatic nailing machine to which the present invention is applied. Reference numeral 1 is a main body of the nailing machine, which has a striking mechanism including a piston / cylinder mechanism (not shown) built therein.
Further, a driver is integrally attached to the piston.
A grip portion 2 (in which an air chamber is formed inside) is projectingly provided on the back surface side (right side in the drawing) of the main body 1, and the end portion 2a is for communicating with a compressor which is a compressed air supply source. An air plug 3 for connecting the hose is attached. Further, a nose 4 for slidingly guiding the driver is provided on the lower end side of the nailing machine body 1. A nose hole 5 is penetratingly formed in the nose 4, and the nails supplied and loaded one by one in the nose hole 5 can be hit by the driver to be ejected from the injection port of the nose tip 4a. . The supply of nails into the nose hole 5 is such that the connecting nails are fed one by one from a magazine (not shown) via a nail supply device 6 arranged on the side of the nose.

Reference numeral 7 denotes a trigger lever, which is rotatably pivotally attached to a vicinity of a base portion of the grip portion 2 by a support shaft 8. A contact arm 13 is arranged so as to be vertically slidable along the nose 4, and a tip 13a is biased by a spring 14 so as to project forward (downward in the drawing) from the tip 4a of the nose 4. Further, the base end 13b faces the free end of the contact lever 10 attached to the trigger lever 7. Then, the trigger valve 11 provided at the base of the grip portion 2 operates only when the pushing operation of the contact arm 13 and the pulling operation of the trigger lever 7 by fingers are performed, and the nail valve is interlocked with the trigger valve 11. A main valve provided on the main body of the hammer is operated to drive the hammering mechanism so that the nail is ejected from the nose 4.

Next, referring to FIGS. 2 to 6, details of the starting mechanism of the nailing machine composed of the trigger lever 7, the trigger valve 11, and the contact arm 13 will be described, and if necessary, refer to FIG. While explaining.

FIG. 2 is a diagram showing the activation device in the non-operation state. The trigger lever 7 is closer to the left end in the figure of the rising pieces 72 and 73 formed by bending in an L shape along both side edges of the finger hook 71, that is, near the base end of the trigger lever 7 from the nailing machine body 1. It is pivotally supported by a support shaft 8 on the protruding portion 1a. Therefore, in the trigger lever 7, the tip 71a, that is, the free end on the right side in the figure, is vertically movable around the support shaft 8.

The contact lever 10 is formed by bending the base end of the strip-shaped metal plate shown in FIG.
1, a guide piece 103 is formed at the center, and a facing portion with the base end 13b of the contact arm 13 is formed at the free end portion on the left end side in FIG. Then, a side surface "V" -shaped bent portion 102 is formed by bending at a portion of the contact lever 10 near the free end.
Further, a penetrating portion 15 is provided between the bent portion 102 and the bearing portion 101 at a portion facing the tip 12a of the trigger valve stem 12. The fulcrum shaft 9 pivotally supported between the rising pieces 72 and 73 is inserted into the bearing portion 101 to pivotally support the contact lever 7. In addition, two concave grooves 1 are provided on one side of the penetrating portion 15.
04 and 105 are formed.

Next, in the space between the penetrating portion 15 of the contact lever 10 and the guide piece 103, a block member 106 made of synthetic resin is provided between the base end and the free end of the contact lever 10. It is slidably provided between a position (solid line position in FIG. 2) and a second position (dotted line position in FIG. 2). That is, as shown in FIG. 6, the block member 106 has a sliding portion 106 housed in the space.
a is connected to the operation portion 106b protruding outside the space, and an elastic protrusion 107 is formed on one side of the sliding portion 106a. The protrusion 107
Corresponds to the concave grooves 104 and 105 on one side of the penetrating portion 15, and when the sliding portion 106a is housed in the space, the protruding piece 107 and the concave groove are respectively at the first position and the second position. It is formed so as to engage with 105 and 104. When the operating portion 106b is strongly pushed or pulled, the above engagement is released by the elasticity of the projecting piece 107, and the sliding portion 106a can be slid.

The block member 106 is arranged such that, in the first position, at least a part of the block member 106 closes the penetrating portion 15 formed in the contact lever so that the block member 106 and the trigger valve stem 12 can contact each other.
In the second position, the trigger valve stem 12 is arranged to release the penetrating portion 15 of the contact lever 10.

The trigger valve 11 is arranged between a conduit 111 communicating with the air chamber in the grip portion 2 and a conduit 112 communicating with the main valve. The valve 11 is normally operated by the return spring 113 by the trigger valve stem 12
Is pushed downward, the pipes 111 and 112 are made to communicate with each other to render the main valve inoperative, and when the trigger valve stem 12 is pushed upward,
The ring 114 and the seal ring 115 are the above-mentioned pipelines 11.
1 and 112 are shielded from each other, and the conduit 112 leading to the head valve upper chamber is communicated with the atmosphere by a through port 116.
The striking mechanism is driven by operating the main valve. Then, the trigger valve stem 12
A cylindrical body 16 having a flange portion at the lower end is fitted in the vicinity of the protruding end projecting toward the trigger lever 7 and the trigger valve stem 12 can be inserted through the through portion 15 of the cylindrical body 16. The cylindrical body 16 includes a spring 118 arranged between the flange portion 17 and the step portion 117 of the valve housing.
Is urged to be pressed against the contact lever 10 side.

Next, an operation mode of the activation device having the above configuration will be described.

First, in the normal state, that is, in the non-operation state, the state shown in FIG. 2 is obtained. That is, in this state, neither the trigger lever 7 is pulled up nor the contact arm 13 is pushed up. Therefore, in this state, the trigger lever 7 is pushed downward together with the contact lever 10 by the spring 118. Further, the trigger valve stem 12 faces the penetrating portion 15 of the contact lever 10 and makes the conduits 111 and 112 communicate with each other, so that the driver remains stopped at the top dead center. At this time, the leading end of one of the connecting nails has already been supplied and loaded into the nose hole 5 of the nose 4 by the nail supply device 6.

Next, the case where the nail driving operation is started by the nail driving operation will be described separately for the single shot driving and the continuous driving.

(A) In the case of single-shot driving First, the block member 106 is slid and stopped at the second position, and the trigger valve stem 12 is arranged so as to release the penetrating portion 15 of the contact lever 10. .

When performing nailing work, first contact arm 13
Press the tip of the to the nailed member. As a result, the contact arm 13 is pushed up, and the base end 13b pushes up the free end of the contact lever 10 to rotate it.
In this state, the trigger valve stem 12 is not yet activated. Then, when the trigger lever 7 is further pulled up, the upper surface 10a of the contact lever 10 facing the lower side of the trigger valve stem 12 as shown in FIG.
The trigger valve stem 12 is also pushed upward by engaging with the peripheral edge 15a of the penetrating portion 15. This allows the O-ring 1
14 and the seal ring 115 shield the pipe line 111, the pipe line 112 is opened to the atmosphere through the passage 116, the start operation is completed, the main valve is activated, the striking mechanism is driven, and the driver drives the nose hole 5 inside. The nail driving operation is performed.

When the trigger lever 7 is further pulled up to the upper end, the position of the penetrating portion 15 is aligned below the tip 12a of the trigger valve stem 12, and the trigger valve stem 12 falls into the penetrating portion 15 by the elastic force of the spring 113, and the trigger valve 7 11
Switches to the state shown in FIG. 4, returns the main valve to its original state, and restores the driver.

When the contact arm 13 is separated from the nailed member while the trigger lever 7 is still pulled after the nail driving, the contact lever 10 rotates as shown by the dotted line in the figure, and the free end thereof descends downward. However, even in this state, the tip 12a of the trigger valve stem 12 is still positioned in the penetrating portion 15, and therefore the contact arm 13 is again provided.
Even if the contact lever 10 is pushed up, the trigger valve stem 1
2 does not move, the trigger valve 11 does not switch.

Similarly, when driving the nail, even if the trigger lever 7 is first pulled up and then the contact arm 13 is pressed, the nail driving machine does not start.

As described above, the trigger valve 11 operates only by pushing up the contact arm 13 first and then pulling the trigger lever 7, and a single shot can be performed. Since the operation order of the contact arm 13 and the trigger lever 7 for starting is fixed,
There is no risk of dribbling.

(B) In the case of performing continuous striking In this case, the block member 106 is slid and stopped at the second position, and at least a part of the block member 106 closes the penetrating portion 15 formed on the contact lever, and blocks it. Arrange so that the trigger valve stem can come into contact.

Next, when driving the nail, the tip of the contact arm 13 is pressed against the nailed member. Similar to the case (a), the contact arm 13 is pushed up and the free end of the contact lever 10 is pushed up to rotate, but in this state, the trigger valve stem 12 is not yet activated. Then, when the trigger lever 7 is further pulled up, the upper surface 10a of the contact lever 10 facing the lower side of the trigger valve stem 12 as shown by the dotted line in FIG. Penetration part 15
The trigger valve stem 12 is also pushed upward by engaging the peripheral edge 15a of the. As a result, the O-ring 114 and the seal ring 115 shield the pipe line 111, the pipe line 112 is opened to the atmosphere through the passage 116, the main valve operates, the driving mechanism is driven, and the driver drives the striking mechanism to move the nose hole 5 inside The nail driving operation is performed.

Next, even if the trigger lever 7 is further pulled up,
As shown in FIG. 5, the tip 1 of the trigger valve stem 12
2a abuts the block member 106 housed in the penetrating portion 15, and the trigger valve stem 12 moves further upward, but the flow state of the compressed air does not change, so the trigger valve 11 does not switch operation.

Next, when the contact arm 13 is separated from the nailed member while the trigger lever 7 is pulled after the nail has been driven, the contact lever 10 rotates as shown by the dotted line in the figure, and its free end descends downward. Therefore, the trigger valve stem 12 also descends due to the elastic force of the spring 113, the trigger valve 11 is switched to the initial state shown in FIG. 2, the main valve is returned to the original state again, and the driver is restored.

Then, the free end of the trigger valve stem 12 is pushed up by pushing the contact arm 13 against the nailing member again to move it upward, and pushing up the contact lever 10 as shown by the solid line in FIG. ,
The trigger valve 11 is switched and the nailer is activated. Similarly, while the trigger lever 7 is being pulled, the nailing machine is activated each time the contact arm 13 is pushed away from the nailed member, so that continuous hammering can be performed.

(Operation and effect of device) As described above, when the block member is set to the second position, the penetrating portion of the contact lever is released with respect to the trigger valve stem, so that the penetrating portion only pulls up the trigger lever. When it is operated or when the contact arm is pushed up and the trigger lever is pulled up to the upper end, the trigger valve stem is inserted, and when only the contact arm is pulled up, the trigger valve stem is disengaged from the axial direction. Therefore, the nailing machine can be activated only by pulling up the trigger lever after pushing up the contact arm.
Only a single shot is possible, and it is possible to prevent dribble shots and perform accurate shots.

On the other hand, when the block member is set to the first position, at least a part of the block member closes the penetrating portion formed in the contact lever and is arranged so as to be able to contact the trigger valve stem. Therefore, the nailing machine can be started by pushing up the contact arm and pulling up the trigger lever, so that the contact arm is continuously pushed and released from the nailed member while the trigger lever is pulled. You can do quick nailing.

[Brief description of drawings]

1 is an external side view of a nailing machine according to the present invention, FIG. 2 is a cutaway sectional view of a main part of a starting device in a non-operating state of the nailing machine, and FIGS. 3 to 5 are nailing operations. FIG. 3 is a sectional view showing a state in which a contact arm and a trigger lever are operated, FIG. 4 is a sectional view in a state in which the trigger lever is pulled up to an upper end, and FIG. 5 is a block member in a first position. FIG. 6 is a sectional view showing a state in which the trigger lever is set and pulled up to an upper end, and FIG. 6 is a perspective view of a contact lever and a block member. Reference numeral 1 ... Nail driver main body, 7 ... Trigger lever, 10 ...
Contact lever, 13 ... Contact arm, 15 ...
... Penetration part, 106 ... Block member

Claims (1)

[Scope of utility model registration request] 1. A trigger valve stem is actuated when the contact lever is pushed up by pushing up the contact arm and pulling the trigger lever, and the trigger lever pivots the base end to the nailing machine main body. The contact lever pivotally supports the base end of the trigger lever at the free end side of the trigger lever, and projects the free end toward the base end of the trigger lever to face the end of the contact arm. Only the contact arm is a position where the trigger valve stem can be inserted when the trigger lever alone is pulled up and when the contact arm is pushed up and the trigger lever is pulled up to the upper end. When the pulling operation is performed, the trigger valve stem is opened at a position deviating from the axial direction. And the penetrating portion is provided with nailing machine, the first position and a second of the block member to a contact lever provided between the base end and a free end of the contact lever
Is slidably provided between the trigger valve stem and the first position, and at least a part of the block member closes the penetrating portion formed in the contact lever so that the block member can come into contact with the trigger valve stem. The actuating device for a nail driver, wherein the block member is arranged to release the penetrating portion of the contact lever with respect to the trigger valve stem in the second position.