JPH0796188B2 - Automatic repeater of driving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is particularly effective in a driving machine for driving fasteners such as nails and staples, such as an air nailing machine, by holding the trigger while pulling. The present invention relates to an automatic repeater for a driving machine capable of repeatedly repeating a driving operation.

[Conventional technology]

FIG. 6 shows an automatic repeat actuating device for an air nailer shown in Japanese Examined Patent Publication No. 57-36114. When a trigger (not shown) is pulled, the compressed air in the main valve chamber 31 is exhausted through the first passage 24, the main valve 16 moves upward, and the piston upper chamber 30
The compressed air in the driving air chamber 33 rapidly flows thereinto, the piston 6 is rapidly lowered, and a stopper not shown is driven. With the upward movement of the main valve 16, the switching valve 36 provided in the main valve 16 is switched, and the compressed air in the driving air chamber 33 enters the repetitive valve chamber 32 through the fifth passage 27, The repetitive valve 17 is lowered to close the first passage 24. When the first passage 24 is closed, compressed air flows into the main valve chamber 31 from the third passage 26 provided in the main valve 16, the pressure in the main valve chamber 31 rises, and the main valve 16 descends. The compressed air in the piston upper chamber 30 is discharged from the exhaust valve 4. Since the compressed air supplied when the piston 6 descends is stored in the piston lower chamber 29 and the return air chamber 19, the piston 6 ascends and returns as the compressed air in the piston upper chamber 30 is exhausted. As the main valve 16 descends, the switching valve 36 also switches,
The compressed air in the repetitive valve chamber 32 is exhausted through the fifth passage 27 and the throttle valve 35, the repetitive valve 17 rises to open the first passage 24, and the compressed air in the main valve chamber 31 is exhausted. First passage
Since the passage area of 24 is larger than the passage area of the third passage 26, the pressure in the main valve chamber 31 decreases, and
16 rises again and the driving operation is repeated.

In addition, 1 is a driver main body, 5 is a cylinder, 20 is an exhaust port, and 34 is a repetition time adjusting screw.

[Problems to be Solved by the Invention]

In the above-mentioned driving machine, the exhaust of the piston upper chamber 30 is performed by lowering the main valve 16, but the main valve 16
The exhaust valve 4 opens and the upper end surface of the cylinder 5 closes. Therefore, when the exhaust valve 4 is opened, the upper end surface of the cylinder 5 is not closed, and the driving air chamber 33
The compressed air inside is exhausted unnecessarily. In order to reduce this exhaust amount as much as possible, it is necessary to increase the descending speed of the main valve 16, and for that purpose, it is necessary to increase the amount of compressed air introduced into the main valve chamber 31. However, in the conventional structure, the intake air into the main valve chamber 31 is only from the third passage 26, and the third passage 26 always communicates between the driving air chamber 33 and the main valve chamber 31. Not only a large amount of waste air is exhausted when the air in the main valve chamber 31 is exhausted, but also the main valve chamber 31
The internal pressure does not drop and the main valve 16 does not operate. Therefore, the conventional driving machine has a drawback that a large amount of air is wasted.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to provide an automatic repeater for a driving machine, which can speed up the operation of the main valve of this kind of driving machine and reduce the air consumption. Is.

[Means for Solving the Problems]

The above object is to provide a repetitive valve in the middle of a first passage for introducing compressed air into the main valve chamber, open and close the first passage by the operation of the repetitive valve, and to provide a main valve chamber and injection air for accumulating compressed air. This is achieved by providing a fourth passage between them, which further opens and closes in accordance with the vertical movement of the main valve and closes at the bottom dead center position of the main valve.

[Action]

The present invention has a first passage for introducing compressed air into the main valve chamber, a repeat valve for opening and closing the first passage is provided in the middle of the first passage, and a fourth passage is provided between the main valve chamber and the driving air chamber. Since the fourth passage is opened and closed according to the vertical movement of the main valve and closed at the bottom dead center position of the main valve, even if the passage area of the fourth passage is increased, the passage from the first passage to the main valve chamber is increased. Since the air is not exhausted from the fourth passage when the air is exhausted, the main valve rises promptly and wasteful exhaust is eliminated.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a side sectional view showing an embodiment of an automatic repeater for a driving machine according to the present invention, and FIGS. 2 to 4 are side sectional views showing the operating state of FIG. 1, respectively. A cylindrical cylinder 5 is provided in the driving tool body 1, and 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. A main valve 16 is provided at the upper end of the cylinder 5, and when the main valve 16 rises, the upper end of the cylinder 5 opens and the exhaust valve 4 closes, so that the driving air chamber 33 and the piston upper chamber 30 communicate with each other. The lower end of the cylinder 5 closes and the exhaust valve 4 opens, so that the piston upper chamber 30 communicates with the atmosphere. Main valve chamber 31 is repetitive valve 1
7. It communicates with the switch 2 through the first passage 24 and also with the driving air chamber 33 through the third passage 26. The main valve 16 is provided with an injection air chamber 33 when the main valve 16 is raised.
And the main valve chamber 31 communicate with each other, and when the main valve 16 descends to the bottom dead center, the cylinder 5 or the cylinder sleeve 34
The fourth passage 8 is provided at a position closed by the upper end surface such as.

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 the second passage 25. A communication passage 18 is provided on the side wall of the cylinder 5 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 has passed the downward direction.

Next, the operation will be described.

2 to 4, when the switch 12 is opened by operating the trigger 12, the compressed air in the main valve chamber 31 is exhausted from the switch 2 through the first 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 compressed air that has flowed in causes the piston 6 to rapidly descend and drive the stopper 9 into the material to be driven.

When the piston 6 passes through the communication passage 18, the piston upper chamber 30
The compressed air therein flows from the communication passage 18 into the return air chamber 19.

The repetitive valve chamber 32 is connected to the piston lower chamber via the second passage 25.
29, because it communicates with the return air chamber 19, the piston lower chamber
Repeated valve 17 descends due to pressure increase in 29
Close 24. Therefore, the pressure in the main valve chamber 31 is increased by the compressed air flowing in from the fourth passage 8 and the third passage 26, and the main valve 16 is lowered. By lowering the main valve 16, the upper end of the cylinder 5 is closed and the exhaust valve 4 is opened, so that 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 low, and further becomes low because it is exhausted from the gap between the driving rod of 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 first passage 24 opens, and the compressed air in the main valve chamber 31 is exhausted from the switch 2. It

Since the fourth passage 8 provided in the main valve 16 is closed as the main valve 16 descends to the bottom dead center, the intake of air from the fourth passage 8 is prevented. The passage area of the third passage 26 is the first
Since it is set to be sufficiently smaller than the passage area of the passage 24, the pressure in the main valve chamber 31 drops rapidly. When the pressure in the main valve chamber 31 decreases, the main valve 16 again rises and the driving operation is performed. The above-described operation is repeated and the stopper 9 is driven into the material to be driven.

Next, when the trigger 12 is released and the switch 2 is closed, the driving air chamber
The compressed air in 33 flows into the main valve chamber 31 via the first passage 24, so that the main valve 16 descends and the repetition of the driving operation stops at this point.

The embodiment shown in FIGS. 1 to 4 shows an example in which the present invention is adopted in a structure in which the repetitive valve chamber 32 and the piston lower chamber 29 are communicated with each other through the second passage 25. The present invention may be adopted in a structure in which the switching valve 36 inputs and exhausts compressed air to and from the valve chamber 32, and an embodiment thereof is shown in FIG. A fourth passage 8 may be provided as shown in FIG.
The function and effect are the same as in FIG.

〔The invention's effect〕

According to the present invention, a repetitive valve that interlocks with the main valve is provided in the middle of the first passage that guides compressed air into the main valve chamber, and the fourth passage that connects the main valve chamber and the driving air chamber is provided. Since the fourth passage is closed with the lowering of the main valve, when the main valve rises to the top dead center, the repetitive valve operates and the exhaust of the compressed air in the main valve chamber stops, and the third passage from the third passage is closed. Since the main valve descends according to the intake air and the fourth passage closes when descending, even if the passage area of the fourth passage is increased, when the exhaust air from the first passage is performed, the intake air from the fourth passage is not performed. , The pressure in the main valve chamber is rapidly lowered, the main valve is rapidly raised, wasteful exhaust air from the fourth passage through the first passage is eliminated, and the passage area of the fourth passage is increased to increase the main valve. Into the main valve chamber at top dead center Intake air promptly performed, main descent of the valve becomes quick, it is possible to reduce wasteful discharge of the compressed air in the implantation air chamber, it is possible to reduce the air consumption.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of an automatic repeater for a driving machine according to the present invention, FIGS. 2 to 4 are side sectional views showing the operating state of FIG. 1, and FIG. FIG. 6 is a side sectional view showing another embodiment of the invention, and FIG. 6 is a side sectional view of a conventional automatic repeater for a driving machine. In the figure, 5 is a cylinder, 6 is a piston, 8 is a fourth passage, 9 is a stopper, 12 is a trigger, 16 is a main valve, 17 is a repetitive valve, 18 is a communication passage, 19 is a return air chamber, and 23 is an injection chamber. Outlet, 24 is the first passage, 25 is the second passage, 26 is the third passage, 29 is the piston lower chamber, 30 is the piston upper chamber, 31 is the main valve chamber, 32 is the repetitive valve chamber, 33 is the injection air chamber .

Claims (1)

[Claims] 1. A driving air chamber for accumulating compressed air, a piston reciprocally provided in a cylindrical cylinder, and a compressed air in the driving air chamber introduced into a piston upper chamber of the piston. In addition, a main valve that alternately performs the operation of discharging to the atmosphere and a first passage that guides the compressed air into the main valve chamber are provided. By discharging the compressed air in the main valve chamber from the first passage, the main valve is In an internal machine that opens and allows compressed air in the driving air chamber to flow into the upper chamber of the piston to lower the piston and perform a driving operation, a repetitive valve is provided in the middle of the first passage, and A fourth passage that opens and closes the first passage and connects the main valve chamber and the driving air chamber is provided, and the fourth passage is opened and closed according to the vertical movement of the main valve. At the bottom dead center of Bareb An automatic repeater for a driving machine, which is characterized by being closed in advance.