JPH0744458Y2 - Driving device for fasteners - Google Patents

Description

[Detailed Description of the Invention] [Field of Use of the Invention] The present invention relates to a fastener feeding section of a driving tool for driving a coupling stopper held by a coupling band.

[Background of the invention]

FIG. 10 shows a fastener feeding device for a driving tool proposed in Japanese Patent Application Laid-Open No. 61-117074 previously filed by the present applicant. By operating the switches 2a and 2b, the piston 6 in the cylinder 5 descends and the stopper 9 in the injection port 23 is driven. Another exit
The feeding part for feeding the stoppers 9 one by one into the inside 23 is composed of the feed piston 13, the feed pawl 8 and the like, and the feed pawl 8 is always located on the ejection port 23 side by the feed spring. By reciprocating in the direction perpendicular to 23, the stopper 9 is sequentially ejected
Send in. The operation of the feeding section is performed by operating an operator 40 provided on the outer surface of the main body to open the feed valve 3, and compressed air is fed to the end of the feed piston 13 through the feed valve 3 and the pressurized gas supply passage 21. Inflow and feed piston 13,
Since the feed pawl 8 is operated, there is an effect that the stopper can be fed regardless of the operation of the piston 6 and that one stopper 9 can be driven by several hits.

The operation of the feeding unit will be described. Since the stopper feeding can be performed regardless of the driving operation of the piston 6, the stopper 9 is the injection port.
If the operator 40 is mistakenly operated in a state of being pre-loaded in the 23, the feed piston 13 is retracted by the compressed gas, and the feed pawl 8 moves to the feed position of the third stopper 9 from the top. However, since the stopper 9 is provided inside the ejection port 23, after the compressed gas is discharged, the third stopper 9 is pressed against the ejection port 23 and locked at the retracted position. Therefore, when the piston 6 hits the stopper 9 in the ejection port 23 and then tries to make a few more hits, the feed claw 8 that presses the third stopper 9 is in the ejection port 23. Since the stopper 9 is lost, the second stopper 9 is automatically fed into the ejection port 23, and the stopper 9 is further driven into the already driven stopper 9. It was For example, when the present invention is applied to a driving machine which is provided with a repetitive valve structure and automatically repeats the driving operation during the operation of the control valve and hits the stopper 9 several times, the stopper is preliminarily set in the injection port 23. Incorrectly feed valve 3 after loading 9
If the button is operated, the stopper 9 is further struck on the stopper 9 during driving, and there is a drawback that the stopper 9 jumps out to the outside and is dangerous.

[Purpose of device]

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and improve the safety of this kind of driving tool.

[Outline of device]

That is, according to the present invention, if the feed pawl and the feed piston in the feed passage of the stopper are provided so as to be movable in the feed direction of the stopper and a spring is provided between the feed pawl and the feed piston, the stopper is already ejected. Even if the feed valve is operated while it is being supplied to the mouth, the spring provided between the feed claw and the feed piston will bend and the stopper will not be fed, and the structure of this part was devised. Is.

[Example of device]

Next, an embodiment of the present invention will be described with reference to FIGS.

A cylindrical cylinder 5 is provided in the driving machine body 1,
A piston 6 is provided in the cylinder 5 so as to be vertically slidable. Further, a piston ring 28 is provided on the outer circumference of the piston 6 to seal between the cylinder 5 and the piston 6. Further, a main valve 16 is provided on the upper end of the cylinder 5, and when the upper end of the cylinder 5 is opened and the exhaust valve 4 is closed by the rise of the main valve 16, the driving air chamber 33 and the piston upper chamber 30 communicate with each other, and the main valve 16 When the upper end of the cylinder 5 is closed and the exhaust valve 4 is opened by descending, the piston upper chamber 30 communicates with the atmosphere. Further, the main valve chamber 31 communicates with the switch 2 through the repetitive valve 17 and the passage 24, and also communicates with the driving air chamber 33 through the passage 26.

Below the cylinder 5, the piston lower chamber including the return air chamber 19
29, the return air chamber 19 communicates with the repeat valve chamber 32 via a passage 25. On the side wall of the cylinder 5, a communication passage 18 is provided via a check valve 22 so that the piston upper chamber 30 and the piston lower chamber 29 communicate with each other after the piston 6 descends by a predetermined amount. The communication passage 18 is provided to prevent jumping up of the driving tool body 1 that occurs when the stopper 9 is no longer driven due to insufficient driving energy during the driving stroke of the stopper 9. The passage area and the installation position of the communication passage 18 are such that the compressed air in the piston upper chamber 30 is allowed to flow from the communication passage 18 through the return air chamber 19 into the piston lower chamber 29 before the stopper 9 is stopped. The pressure inside is set to be approximately the same as or higher than the pressure inside the piston upper chamber 30.

FIG. 3 shows a cross-sectional view (feeding portion 15) taken along the line BB in FIG. 2, in which one side of the injection hole 23 for ejecting the stopper 9 has a connecting band 27.
A stopper guide path 39 for guiding the connecting stopper 10 connected by is provided. A pressurized gas supply passage is provided on the side of the stopper guide passage 39.
There is a feed piston 13 that moves to the injection port side when compressed air enters from 21.
It is a structure that is pushed backward at 11. Also a mover
Part 41 is exposed in the stopper guide path 39, and the window 37
Has a feed claw 8 that engages with. Further, the stopper guide path 39 has a structure having a check claw (not shown) that engages with the window 37 of the connecting band 27 and locks the rearward movement of the connecting band 27.

FIG. 4 is a cross-sectional view of the feed valve 3, but the pressurized gas supply passage 20 is always closed, and by pushing up the feed valve 3, the pressurized gas supply passage 20 becomes the pressurized gas supply passage 21. It is a structure that communicates.

FIG. 5 shows the respective passage relationships of the switch 2, the feed valve 3 and the feed piston 13 described above. In the figure, a pressurized gas supply passage 21 for operating the feed piston 13 is provided with a pressurized gas supply passage 20 through the feed valve 3 and a passage 24.
And the driving air chamber 33 through the switch 2.

Next, the operation will be described.

6 and 7, when the trigger 12 is operated, the switch 2 is opened, the compressed air in the main valve chamber 31 is exhausted from the switch 2 through the passage 24, and the main valve 16 rises. As the main valve 16 rises, the exhaust valve 4 closes, the piston upper chamber 30 communicates with the driving air chamber 33, and the compressed air in the driving air chamber 33 flows into the piston upper chamber 30. The piston 6 rapidly descends by the inflowing compressed air. At this point, the energy due to the compressed air pressure is transmitted to the piston 6 as the kinetic energy of the piston 6. When the piston 6 passes through the communication passage 18, the compressed air in the piston upper chamber 30 flows into the piston lower chamber 29 from the communication passage 18, and the pressure in the piston lower chamber 29 rapidly rises.

On the other hand, since the repetitive valve chamber 32 communicates with the lower piston chamber 29 through the passage 25, the repetitive valve 17 descends due to the increase in the pressure in the lower piston chamber 29, closing the passage 24. Therefore, the pressure in the main valve chamber 31 rises with the compressed air flowing in from the passage 26, and the main valve 16 descends. By lowering the main valve 16,
Since the upper end of the cylinder 5 is closed and the exhaust valve 4 is opened, the compressed air in the piston upper chamber 30 is exhausted from the exhaust valve 4. Therefore, the piston 6 is pushed up by the compressed air in the piston lower chamber 29 and returns to the top dead center. As the piston 6 returns, the pressure in the piston lower chamber 29 expands and becomes lower, and further becomes lower because it is exhausted from the gap between the piston 6 and the injection port 23. Therefore, the pressure in the repetitive valve chamber 32 also decreases, so that the repetitive valve 17 is pushed up by the pressure in the main valve chamber 31, the passage 24 opens, and the compressed air in the main valve 31 is exhausted from the switch 2. When the compressed air in the main valve chamber 31 is exhausted, the main valve 16 rises again and the driving operation is performed as described above. The above operation is repeated to drive the stopper 9 into the material to be driven.

When the trigger 12 is released and the switch 2 is closed, the compressed air in the driving air chamber 33 passes through the passage 24 and flows into the main valve chamber 31, so that the main valve 16 descends and the repetition of the driving operation is stopped at this point. To do.

Next, after the driving of the stopper 9 is completed, the next stopper 9 is inserted into the injection port 23.
The operation of feeding the paper will be described below.

FIG. 8 is a view showing a state where the feed valve 3 is operated. In the figure, when the feed valve 3 is operated, the compressed air in the driving air chamber 33 is compressed from the passage 24 to the pressurized gas supply passage 20 and the feed valve. 3, the feed piston chamber 34 through the pressurized gas supply passage 21
And the feed piston 13 is moved to the injection port 23 side.
When the feed piston 13 moves to the ejection port 23 side, the feed claw 8 also moves to the ejection port 23 side, the feed claw 8 engages with the window 37 of the connecting band 27, moves the connecting band 27 forward, and stops the stopper 9. Is sent to the injection port 23.

Here, FIG. 9 shows a case where the feed valve 3 is erroneously operated in a state in which the stopper 9 is loaded in the injection port 23 in advance. When the feed valve 3 is operated while the stopper 9 is already engaged with the ejection port 23, compressed air flows into the feed piston chamber 34 from the pressurized gas supply passage 21, and the feed piston 13 is moved to the ejection port side. Moving. Here, since the stopper 9 has already been supplied into the injection port 23, the connecting band 27 does not move, and the mover 41 and the feed pawl 8 are slidably provided in the feed piston 13 via the spring 42. Therefore, the spring 42 bends and moves 41, and the feed claw 8 does not move.

Next, when the feed valve 3 is released as shown in FIG. 5, the compressed air in the driving air chamber 33 is closed by the feed valve 3 and the compressed air in the feed piston chamber 34 is exhausted from the feed valve 3. Therefore, the feed claw 8 returns to the state before the second operation of the feed valve 3, and the second stopper 9 is not fed to the ejection port 23 during the driving operation of the stopper 9.

[Effect of device]

According to the present invention, in a driving machine having a feed pawl that feeds a stopper and a feed piston that reciprocates according to the inflow of compressed air to move the feed pawl in the feed direction of the fastener, the feed piston and the feed pawl are Since the stopper is attached so as to be movable in the feed direction and the spring is provided between the feed piston and the feed pawl, the following effects can be obtained.

That is, with the stopper already loaded in the injection port,
When compressed air is added to the feed piston when the feed valve is operated, the feed piston operates, but the spring contracts and the feed pawl does not work, and the next stopper cannot be fed. It is possible to obtain the effect that the stopper is not sent into the injection port. If the spring load is set properly,
It is possible to prevent an excessive load from being applied to the stopper and prevent the stopper from being disengaged from the connecting band and being fed to the ejection port.

[Brief description of drawings]

1 is an overall view of the driving tool of the present invention, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 2, and FIG. 4 is a sectional view of the feed valve of FIG. Sectional view, FIG. 5 is a sectional view showing a passage relation of the fastener feeding device, FIGS. 6 and 7 are longitudinal sectional views showing an operating state of FIG. 2, FIG. 8 and FIG. FIG. 10 is a cross-sectional view showing the operating state of the figure, and FIG. 10 is a vertical cross-sectional view of a conventional driving tool. In the figure, 1 is a driving tool body, 3 is a feed valve, 6 is a piston, 8 is a feed claw, 9 is a stopper, 13 is a feed piston, and 14
Is a control valve, 15 is a feeding unit, 21 is a pressurized gas supply passage,
23 is an ejection port, 40 is an operator, 41 is a mover, and 42 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A piston that performs a driving operation, a control valve that is operably arranged from the outside to control a driving operation of the piston, an injection port that injects a stopper, and the stopper inside the injection port. In a driving machine having a feeding part for feeding the feeding claw, and a feeding claw for feeding the stopper and a feeding piston for operating the feeding claw in the feeding part, between the feeding piston and the feeding claw. A fastener feeding device for a driving tool, wherein a spring is provided and the feed piston and the feed pawl are attached so as to be movable in the feed direction of the fastener.