JP2768051B2 - Compressed air screw tightening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air screw tightening machine which reduces the consumption of compressed air.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a compressed air screw tightening machine. When the compressed air intake 5 is connected to a compressed air source such as an air compressor, and the intake valve 3 is pulled, the compressed air is supplied into the rotating body 1 through the air passage 8 so that the rotating body 1 rotates and the gears are rotated. The screw 12 is turned through the transmission device 4 which is decelerated at 14 and has a drive bit attached to the tip, and the screw 12
Screw. The compressed air supplied into the rotating body 1 is exhausted through the exhaust port 10. When the intake valve 3 is released, the valve closes and the supply of compressed air to the rotating body 1 stops.
Rotation stops and screwing in ends.

[0003]

As described above, in the conventional compressed air screw tightening machine, the supply of the compressed air to the rotating body 1 is stopped by operating the intake valve 3. Therefore, the worker closes the intake valve 3 after confirming that the tightening has been completed, so that the compressed air is wastedly discharged until the intake valve 3 is closed after the completion of the tightening, and the air consumption is reduced. There was a drawback that there were many. On the other hand, in the architectural field, as the amount of gypsum board used increases, the amount of board screws used to stop it increases, and the demand for lightweight screw tightening machines for tightening board screws has increased. Conventionally, electric screwdrivers have been used, but there is a strong demand for heavy, lightweight compressed air screwdrivers. However, when a compressed air screw tightening machine is used for construction, the compressor used as a compressed air source is portable and small, so that a conventional compressed air screw tightening machine cannot use much air. Therefore, there is a strong demand for the development of a compressed air screw tightening machine with low air consumption. SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of the conventional compressed air screwdriver and to provide a compressed air screwdriver that consumes less air.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating body rotated by compressed air, a transmission device for transmitting the rotation of the rotating body to a screw, and an air passage for introducing compressed air to the rotating body. In a screwdriver having an intake valve for controlling the supply of compressed air to the air passage, an air chamber is provided for accumulating an air amount sufficient to stop supply of compressed air to the rotating body almost simultaneously with the completion of screwing. This is attained by opening the air passage by the air valve and supplying a compressed air to the rotating body and at the same time providing a suppression valve for suppressing the supply of the compressed air to the air chamber.

[0005]

The screwing machine constructed as described above operates as follows. When the compressed air is supplied, the compressed air is accumulated in the air chamber, and the intake valve closes the intake path to the rotating body. When the intake valve is pulled, the suppression valve inhibits the supply of compressed air to the air chamber.At the same time, the intake valve opens the air passage to the rotating body, and the compressed air in the air chamber is supplied to the rotating body to rotate the rotating body. To rotate. The rotation of the rotating body is transmitted to the screw by the transmission device, and the screw is screwed into the tightened member. Since only the compressed air stored in the air chamber is supplied to the rotating body, the rotation of the rotating body stops when the compressed air in the air chamber is consumed. Pull the intake valve and set the capacity of the air chamber so that the amount of compressed air supplied from the air chamber to the air supply path to the rotating body accumulates only the amount of air required for tightening one screw. Is determined by the structure to be kept.

[0006]

FIG. 1 shows an embodiment of the present invention. A housing 7 is provided with a compressed air inlet 5 connected to a compressed air source, an air chamber 2 for storing compressed air, and rotated by compressed air. A rotating body 1, an air inlet 8 for guiding compressed air from the air chamber 2 to the rotating body 1, an inlet valve 3 for opening and closing the air inlet 8, and the like are provided. A moving member 6 that can move up and down and can rotate together with the rotating body 1 is provided substantially at the center of the rotating body 1. The moving member 6 is spline-coupled to the lower end of the rotating body 1, and has a transmission device 4, which is a drive bit into which the screw 12 is screwed in contact with the screw 12, integrally attached to the lower end. The upper end has a large diameter portion to which an O-ring is attached, and has a small hole 11 extending downward from the upper end to reach the peripheral wall.

The operation will be described below. When the compressed air intake 5 is connected to the compressed air source, the compressed air is accumulated in the air chamber 2. Next, as shown in FIG. 2, when the intake valve 3 is pulled, the intake port 9 to the air chamber 2 is closed, the suppression valve 16 at the upper end of the intake valve 3 is closed, and the intake path 8 to the rotating body 1 is introduced. The valve 3 is opened, and the compressed air in the air chamber 2 is supplied to the rotating body 1 to rotate the rotating body 1. At the same time, compressed air is also applied to the upper part of the moving member 6, so that the moving member 6
The rotating device descends while rotating, and the transmitting device 4 of the moving member 6 comes into contact with the screw 12 to rotate the screw 12 and screw it into the tightened member 13. When the transmission device 4 moves to a position where the screwing of the screw 12 is almost completed, the supply of the compressed air from the air chamber 2 is stopped, and the compressed air in the rotating body 1 is discharged to the exhaust port 10.
More exhausted. On the other hand, since the moving member 6 is provided with the small holes 11, a part of the compressed air added above the moving member 6 flows into the moving member lower chamber 15 and
5 are stored.

[0008] The supply of compressed air to the rotating body 1 disappears,
At the same time as the compressed air in the rotating body 1 is exhausted,
When the air above is exhausted, the moving member lower chamber 15
The moving member 6 is raised by the pressure of the compressed air accumulated in the moving member 6 and returns to the original position.

According to the above-described embodiment, the air chamber 2 is provided for accumulating an amount of air for the supply of the compressed air when the transmission device 4 moves to the position where the screwing is completed. By providing the suppression valve 16 that closes the opening 9 and the intake valve 3 that opens the air passage 8 to the rotating body 1, there is no need to supply useless compressed air to the rotating body 1. There is. Here, the volume of the air chamber 2 is experimentally determined so that the compressed air disappears when the screwing is completed.

Next, another embodiment will be described. FIG. 3 shows a structure using the air chamber 2, the intake valve 3, and the check valve 16, wherein only the rotation is transmitted to the screw 12 by the gear 14 and the transmission device 4. The operation of the above configuration will be described.
When the compressed air intake 5 is connected to the compressed air source, the compressed air is accumulated in the air chamber 2. Next, when the intake valve 3 is pulled, the suppression valve 16 closes the intake port 9 to the air chamber, and the intake valve 3
The compressed air in the air chamber 2 is supplied to the rotating body 1, the rotating body 1 rotates, is decelerated by the gear 14, rotates the screw 12 via the transmission device 4, and tightens the material to be tightened. 13 screws 1
Screw 2. When the screwing is completed, the air chamber 2
Supply of compressed air from the rotary body 1 is stopped, and the compressed air inside the rotating body 1 is exhausted from the exhaust port 10.

Next, still another embodiment will be described with reference to FIG. FIG. 4 is a modification of the embodiment of FIG.
FIG. 1 shows that the intake valve 3 and the suppression valve 16 move together to control the supply of compressed air, but FIG. 4 shows that the suppression valve 16 is provided at the compressed air intake 5 and the intake air is controlled. The valve 3 is provided above the rotating body 1, and has a structure in which the supply of compressed air is controlled by operating the operation valve 17. The operation of the above configuration will be described. When the compressed air intake 5 is connected to the compressed air source, the compressed air is accumulated in the air chamber 2. Compressed air flows above the intake valve 3, the operation valve 17, and the suppression valve 16, and lowers the intake valve 3, the operation valve 17, and the suppression valve 16. At this time the intake valve 3
Is closed so that compressed air does not flow to the rotating body 1. Operating valve 1
By pulling 7, the compressed air above the intake valve 3 is exhausted from the exhaust port 18 of the operation valve 17, so that the intake valve 3 is raised and opened, and compressed air is directly supplied from the air chamber 2 to the rotating body 1. Then, the transmission member 4 is rotated and the screw 12 is screwed. At the same time, the compressed air above the check valve 16 is also exhausted from the exhaust port 18 of the operation valve 17, and the check valve 16 is also pushed by the spring provided below to close the air inlet 9, and supply compressed air from the compressed air source. Deter. Further, the operation valve 17 closes the operation valve inlet 19 and suppresses the supply of compressed air to the upper part of the inlet valve 3. This structure is a structure in which the air chamber 2 is provided to reduce unnecessary air consumption, and the screw tightening time can be adjusted by operating the operation valve 17.

[0012]

As described above, according to the present invention, an air chamber for accumulating an amount of air for ending the supply of compressed air to the rotating body almost simultaneously with the completion of screwing is provided and operated. By providing the depressing valve that closes the air inlet to the air and the air inlet valve that opens the air path to the rotating body, useless compressed air is not consumed and the air consumption can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a compressed air screw tightening machine of the present invention.

FIG. 2 is a sectional view showing an operation state of FIG.

FIG. 3 is a sectional view showing another embodiment of the compressed air screw tightening machine of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the compressed air screw tightening machine of the present invention.

FIG. 5 is a sectional view showing an example of a conventional compressed air screw tightening machine.

[Explanation of symbols]

1 is a rotating body, 2 is an air chamber, 3 is an intake valve, 4 is a transmission device,
5 is a compressed air intake, 6 is a moving member, 7 is a housing,
8 is an air inlet, 9 is an air inlet, 10 is an air outlet, 11 is a small hole,
12 is a screw, 13 is a member to be tightened, 14 is a gear, 15 is a lower member of a moving member, 16 is a control valve, 17 is an operation valve, 18 is an operation valve exhaust port, and 19 is an operation valve intake port.

Claims (1)

(57) [Claims] 1. A rotating body rotated by compressed air, a transmission device for transmitting rotation of the rotating body to a screw, an air passage for guiding compressed air to the rotating body, and a compressed air flowing into the air passage. An inlet valve for controlling supply, and a compressed air screwdriver for screwing a screw into a member to be tightened, wherein an air chamber for accumulating an amount of compressed air necessary for screwing one screw is provided. According to the operation of the intake valve, a compression valve is provided that opens the intake path and supplies compressed air in the air chamber to a rotating body and inhibits supply of compressed air to the air chamber. Air screw tightener.