JP2020182983A - Pneumatic tool - Google Patents

Abstract

To provide a nailing machine which can stably perform time measurement irrespective of variations of a pneumatic pressure, and can stably switch presence/absence of execution of a continuous driving operation.SOLUTION: A nailing machine 1A comprises: a chamber 70 having a predetermined capacity to which compressed air is supplied; a control valve 8 that is connected to the chamber 70, includes a piston 81 operated by a pneumatic pressure in the chamber 70, and switches presence/absence of operation a head valve 3; and a flow rate control valve 9A that controls a flow rate of compressed air supplied to the chamber 70 according to a pneumatic pressure of the compressed air supplied to the chamber 70 from a main chamber 13.SELECTED DRAWING: Figure 8A

Description

The present invention relates to a pneumatic tool that operates using compressed air as a power source.

A pneumatic tool called a nailing machine is known in which a striking piston is reciprocated using compressed air as a power source to drive a driver coupled to the striking piston to drive a nail or the like supplied to the nose. In such a nailing machine, one operation of pulling the trigger provided on the grip portion and another operation of pushing the contact arm provided on the tip of the nose so as to be reciprocally movable against the material to be driven are two. It is configured to operate the head valve by one operation and drive a nail.

In the following description, the state in which the trigger is pulled by one operation is referred to as ON of the trigger, and the state in which one operation is released and the trigger is not pulled is referred to as OFF of the trigger. Further, the state in which the contact arm is pressed by another operation is referred to as ON of the contact arm, and the state in which the other operation is released and the contact arm is not pressed is referred to as OFF of the contact arm.

In the nail driving machine, for example, after the contact arm is turned on, the head valve is activated by turning on the trigger with the contact arm turned on, and the nail is driven.

After driving the nail, the contact arm is turned off with the trigger turned on, and the contact arm is turned on again with the trigger turned on to activate the head valve and drive the next nail. The technology has been proposed. In this way, the operation in which the contact arm is repeatedly turned on and off while the trigger is in the ON state to continuously drive the nail is called contact striking.

In contact driving, after driving a nail, the nail can be continuously driven every time the contact arm is turned on with the trigger kept ON, which is suitable for quick work. On the other hand, in order to regulate careless movement, a technique has been proposed in which the head valve is deactivated after a predetermined time has elapsed without turning on the contact arm after the trigger is turned on (for example, a patent). Reference 1).

Jikken 6-32308 Gazette

In the configuration in which the head valve is not activated after a predetermined time has elapsed without turning on the contact arm after the trigger is turned on, if the elapse of the predetermined time is measured by an electric timer, the time is stably measured. be able to. However, compressed air driven nailers do not have a source of electricity. Therefore, in order to use the electric timer, a power supply and a circuit are required.

On the other hand, Patent Document 1 proposes a timekeeping mechanism using the pressure of compressed air in a main chamber for storing compressed air for operating a nailing machine. The timekeeping mechanism using air pressure is, for example, a configuration in which compressed air is supplied from a main chamber to a space having a predetermined volume, and when the pressure in the space reaches a predetermined pressure, the valve is operated by this air pressure.

Such a timekeeping mechanism does not require a power supply or a circuit. However, the pressure in the main chamber is increased due to the fact that the pressure of the compressed air supplied from a compressor or the like (not shown) is not always constant and that the compressed air in the main chamber is consumed due to the nail ejection operation or the like. Since it fluctuates, the time until the pressure in the space reaches the predetermined pressure for operating the valve is not constant. For this reason, it is difficult for a nailing machine to which a timekeeping mechanism using air pressure is applied to perform stable timekeeping, and the time from when the trigger is pulled until the head valve is deactivated is not constant.

The present invention has been made to solve such a problem, and makes it possible to perform timekeeping stably and stably regardless of fluctuation factors such as air pressure, and to stably switch between the presence and absence of contact striking. It is an object of the present invention to provide a pneumatic tool that can be used.

In order to solve the above-mentioned problems, the present invention has a chamber having a predetermined volume to which compressed air is supplied, and a piston connected to the chamber and operated by the air pressure in the chamber, and the operation of the controlled object is performed. It is a pneumatic tool equipped with a control valve that switches the presence / absence and an adjustment mechanism that switches the operation of the control valve.

In the present invention, the operating timing, operating amount, etc. of the control valve are switched according to the variable factors such as the air pressure and temperature of the compressed air supplied to the chamber, and the timing of switching the operation of the controlled object is the variable factor. It is controlled according to.

In the present invention, the timing of switching the operation or non-operation of the controlled object can be made constant regardless of the fluctuation factors such as the high and low pressure of the compressed air and the high and low temperature.

It is a side sectional view which shows an example of a nailing machine. It is sectional drawing which shows an example of a head valve. It is sectional drawing which shows an example of a head valve. It is sectional drawing which shows an example of a trigger valve and a switch valve. It is sectional drawing which shows an example of a trigger valve and a switch valve. It is sectional drawing which shows an example of a trigger valve and a switch valve. It is sectional drawing which shows an example of a trigger valve and a switch valve. It is sectional drawing which shows an example of a timer chamber. It is sectional drawing which shows an example of a timer chamber. It is sectional drawing which shows an example of a control valve. It is sectional drawing which shows an example of a control valve. It is sectional drawing which shows an example of the operation of a nailing machine. It is sectional drawing which shows an example of the operation of a nailing machine. It is sectional drawing which shows an example of the operation of a nailing machine. It is sectional drawing which shows an example of the operation of a nailing machine. It is sectional drawing which shows an example of the operation of the nail driving machine which operated the control valve. It is sectional drawing which shows an example of the operation of the nail driving machine which operated the control valve. It is sectional drawing which shows an example of the nailing machine of 1st Embodiment. It is sectional drawing which shows an example of the nailing machine of 1st Embodiment. It is sectional drawing which shows an example of the nailing machine of the 2nd Embodiment. It is sectional drawing which shows an example of the nailing machine of the 2nd Embodiment. It is sectional drawing which shows an example of the nailing machine of 3rd Embodiment. It is sectional drawing which shows an example of the nailing machine of the 3rd Embodiment. It is sectional drawing which shows an example of the nailing machine of 4th Embodiment. It is sectional drawing which shows an example of the nailing machine of 4th Embodiment. It is sectional drawing which shows an example of the nailing machine of the 5th Embodiment. It is sectional drawing which shows an example of the nailing machine of the 5th Embodiment.

Hereinafter, a nailing machine as a driving tool, which is an example of the pneumatic tool of the present invention, will be described with reference to the drawings.

<Configuration example of nailing machine>
FIG. 1 is a side sectional view showing an example of a nailing machine. FIG. 1 shows a state in which the striking piston is located at the top dead center.

The nailing machine 1 includes a striking cylinder 2 inside the main body 10. The striking cylinder 2 is provided with a striking piston 20 slidable inside. The striking piston 20 has a striking driver 21 as a nail launching member fixed so as to project from the lower surface side, and the striking piston 20 and the striking driver 21 move integrally. Further, an O-ring 20a as a sealing member is attached to the outer periphery of the striking piston 20.

The nailing machine 1 is provided with a nose 11 at the lower end of the main body 10. The nose 11 is provided with an injection hole 11a for guiding the striking driver 21 coaxially with the striking cylinder 2.

The nailing machine 1 includes a main chamber 13 in which compressed air is supplied and the supplied compressed air is stored inside the grip portion 12 of the main body 10 and in the peripheral portion of the striking cylinder 2. In the nailing machine 1, the striking piston 20 is driven by the compressed air supplied to the striking cylinder 2. Compressed air for driving the striking piston 20 is supplied to the striking cylinder 2 from the main chamber 13.

The nailing machine 1 is provided with a return air chamber 14 on the outer peripheral side of the striking cylinder 2 independently of the main chamber 13. In the striking cylinder 2, a plurality of small holes 14a are formed in the radial direction at a substantially intermediate portion in the axial direction, and the small holes 14a and the return air chamber 14 communicate with each other via a check valve 14b.

The striking cylinder 2 is provided with a striking piston stopper 22 at the upper end thereof. The striking piston stopper 22 projects from the upper end of the striking cylinder 2 toward the inner peripheral side, and the striking piston 20 that has returned to the top dead center comes into contact with the striking piston stopper 22. Further, the striking piston stopper 22 opens at the center of the upper end portion of the striking cylinder 2. As a result, the striking cylinder 2 is formed with an air supply / exhaust port 22a through which compressed air supplied from the main chamber 13 passes in the center of the upper end portion.

The striking cylinder 2 is provided with a recess 22b on the inner peripheral surface near the upper end portion of the striking piston 20 facing the O-ring 20a in a state where the striking piston 20 is located at the top dead center. When the striking piston 20 returns to the top dead center, the O-ring 20a of the striking piston 20 enters the recess 22b of the striking cylinder 2 to create a gap between the O-ring 20a and the recess 22b. The returning air is discharged, and the driving force of the striking piston 20 is lost. As a result, the striking piston 20 stops at top dead center.

2A and 2B are cross-sectional views showing an example of a head valve. The nailing machine 1 includes a head valve 3 at the upper end of the striking cylinder 2. The head valve 3 is an example of a controlled object. A head valve cylinder 30 composed of a cylindrical space is provided at the upper end portion of the main body 10, and a head valve piston 31 is slidably attached to the inside of the head valve cylinder 30. Be done.

The head valve 3 includes a head valve piston stopper 32 above the head valve piston 31. The head valve piston 31 is provided between the head valve piston stopper 32 and the striking piston stopper 22, and is urged by the spring 33 in the striking piston stopper 22 direction, which is the bottom dead center direction.

The head valve piston 31 is configured to be in contact with the striking piston stopper 22 so as to close the space between the main chamber 13 and the air supply / exhaust port 22a of the striking piston stopper 22. Further, the head valve piston 31 includes an exhaust port opening / closing portion 31a having an opening that communicates with the supply / exhaust port 22a of the striking piston stopper 22 by coming into contact with the striking piston stopper 22.

In the head valve piston 31, the exhaust port opening / closing portion 31a is inserted into the central opening of the head valve piston stopper 32, and between the exhaust port 15 provided on the upper end side of the main body 10 and the supply / exhaust port 22a of the striking piston stopper 22. Opens and closes.

In the head valve 3, a head valve upper chamber 34 is formed between the head valve piston 31 and the head valve piston stopper 32. The head valve upper chamber 34 communicates with the trigger valve 5 or the main chamber 13 via a control valve 8 described later. Further, the head valve upper chamber 34 communicates with the main chamber 13 or the atmosphere via the trigger valve 5.

In the head valve 3. FIG. 2A shows a state in which the head valve piston 31 has moved to the bottom dead center, which is the standby position. When the head valve piston 31 has moved to the bottom dead center, the head valve piston 31 comes into contact with the striking piston stopper 22 to close the space between the main chamber 13 and the air supply / exhaust port 22a of the striking piston stopper 22. As a result, compressed air is not supplied from the main chamber 13 to the striking cylinder 2.

Further, a head valve upper chamber 34 is formed between the head valve piston 31 and the head valve piston stopper 32. Further, the exhaust port opening / closing portion 31a of the head valve piston 31 is lowered into the central opening of the head valve piston stopper 32 to open between the exhaust port 15 and the supply / exhaust port 22a of the striking piston stopper 22. As a result, in the striking cylinder 2, the space above the striking piston 20 communicates with the atmosphere.

FIG. 2B shows a state in which the head valve piston 31 of the head valve 3 has moved to the top dead center, which is the operating position. When the head valve piston 31 has moved to the top dead center, the head valve piston 31 comes into contact with the head valve piston stopper 32 to open the space between the main chamber 13 and the supply / exhaust port 22a of the striking piston stopper 22. As a result, compressed air is supplied from the main chamber 13 to the striking cylinder 2 through the air supply / exhaust port 22a.

Further, the exhaust port opening / closing portion 31a of the head valve piston 31 projects from the central opening of the head valve piston stopper 32 to the exhaust port 15, and the tip of the exhaust port opening / closing portion 31a is a seal member provided above the head valve 3. By coming into contact with a certain head valve seal 35, the space between the exhaust port 15 and the air supply / exhaust port 22a of the striking piston stopper 22 is closed. As a result, the compressed air supplied from the main chamber 13 to the striking cylinder 2 is not exhausted from the exhaust port 15.

As shown in FIG. 1, the nailing machine 1 includes a trigger lever 4 and a contact arm 40. The trigger lever 4 includes a large lever 42 rotatably attached to the main body 10 via a shaft 41 and a small lever 44 rotatably attached to the large lever 42 via a shaft 43.

The contact arm 40 is connected to the pressing member 40a, and the pressing member 40a abuts on the small lever 44 and is reciprocally attached along the axial direction (vertical direction) of the nose 11 via the compression spring 40b. .. Further, the contact arm 40 is urged by a compression spring 40b so as to project from the tip of the nose 11, and the small lever 44 is rotated upward by pressing the tip of the contact arm 40 against the object. It is configured to do.

3A, 3B, 3C and 3D are cross-sectional views showing an example of a trigger valve and a switch valve. The nailing machine 1 includes a trigger valve 5 inside the base end portion of the grip portion 12. The trigger valve 5 is pressed by the small lever 44 to send an operation signal to the head valve 3.

The trigger valve 5 includes a housing 51 in which a passage 50 communicating with the head valve upper chamber 34 via a control valve 8 described later is formed, and a pilot valve 52 movably attached to the housing 51. Further, the trigger valve 5 is provided between the trigger valve stem 54, which is mounted so as to appear and disappear from the inside of the pilot valve 52 with respect to the cap 53, and the pilot valve 52 and the trigger valve stem 54, and lowers the trigger valve stem 54. A spring 55 for pressing against is provided. Further, the trigger valve 5 includes a passage 56 that communicates with the atmosphere.

In the trigger valve 5, a gap S1 is formed between the pilot valve 52 and the housing 51, a gap S2 is formed between the pilot valve 52 and the trigger valve stem 54, and a gap S2 is formed between the trigger valve stem 54 and the cap 53. A gap S3 is formed. Further, a vacancy 53a is formed between the pilot valve 52 and the cap 53.

The pilot valve 52 opens and closes between the O-ring 52a that opens and closes the gap S1 with respect to the main chamber 13 and the passage 50 and the passage 56 according to the position of the pilot valve 52 with respect to the housing 51, and opens and closes through the passage 56. An O-ring 52b that communicates the passage 50 with the atmosphere is provided. Further, the pilot valve 52 includes an O-ring 52c that seals between the vacant space 53a and the passage 56. Further, the pilot valve 52 includes a passage 52d communicating with the main chamber 13.

The trigger valve stem 54 has an O-ring 54a that opens and closes a gap S2 with respect to the main chamber 13 and a gap S3 with respect to a large instrument according to the positions of the pilot valve 52 and the trigger valve stem 54 with respect to the housing 51 and the cap 53. An O-ring 54b that opens and closes is provided.

3A and 3B show a state in which the pilot valve 52 has moved to the standby position and the trigger valve stem 54 has moved to the standby position in the trigger valve 5. In the trigger valve 5, when the pilot valve 52 is moved to the standby position, the O-ring 52b of the pilot valve 52 is in contact with the housing 51, and the passage 50 is closed with respect to the passage 56. On the other hand, the O-ring 52a of the pilot valve 52 is separated from the housing 51 to open the gap S1, and the passage 50 communicates with the main chamber 13 through the gap S1.

Further, in the trigger valve 5, when the trigger valve stem 54 is moved to the standby position, the O-ring 54b of the trigger valve stem 54 comes into contact with the cap 53, and the gap S3 is closed. On the other hand, the O-ring 54a of the trigger valve stem 54 is separated from the pilot valve 52 to open the gap S2, and the vacant chamber 53a communicates with the main chamber 13 via the passage 52d and the gap S2.

FIG. 3C shows a state in which the pilot valve 52 has moved to the standby position and the trigger valve stem 54 has moved to the operating position in the trigger valve 5. In the trigger valve 5, when the trigger valve stem 54 is moved to the operating position, the O-ring 54a of the trigger valve stem 54 comes into contact with the pilot valve 52, and the gap S2 is closed. On the other hand, the O-ring 54b of the trigger valve stem 54 is separated from the cap 53 to open the gap S3, and the vacant chamber 53a communicates with the atmosphere through the gap S3.

FIG. 3D shows a state in which the pilot valve 52 has moved to the operating position and the trigger valve stem 54 has moved to the operating position in the trigger valve 5. In the trigger valve 5, when the pilot valve 52 is moved to the operating position, the pilot valve 52 is in contact with the cap 53 and no vacant space 53a is formed. Further, the O-ring 52a of the pilot valve 52 comes into contact with the housing 51, and the gap S1 is closed. On the other hand, the O-ring 52b of the pilot valve 52 separates from the housing 51 and opens between the passage 50 and the passage 56, and the passage 50 communicates with the atmosphere through the passage 56.

The nailing machine 1 includes a switch valve 6 alongside the trigger valve 5. The switch valve 6 includes a cylinder 60, a switch valve stem 61 that reciprocates in the cylinder 60, and a spring 62 that urges the switch valve stem 61 downward. The switch valve 6 is operated by pulling up the large lever 42 so that the lower end of the switch valve stem 61 is in contact with the large lever 42 due to the urging of the spring 62.

In the switch valve 6, passages 63 and 64 are formed between the cylinder 60 and the switch valve stem 61. In the switch valve 6, the passage 63 communicates with the main chamber 13 via the throttle 63a, and the passage 64 communicates with the atmosphere through the passage 64a. Further, in the switch valve 6, the passage 63 or the passage 64 communicates with the timer chamber 7 described later via the passage 65.

The switch valve stem 61 includes an O-ring 61a that opens and closes between the passage 63 and the passage 65, and an O-ring 61b that opens and closes the passage 64a.

The state in which the switch valve stem 61 has moved to the standby position in the switch valve 6 is shown in FIG. 3A described above. In the switch valve 6, when the switch valve stem 61 is moved to the standby position, the passage 63 and the passage 65 are closed by the O-ring 61a, and the main chamber 13 does not communicate with the timer chamber 7 via the passage 65. On the other hand, the O-ring 61b opens the passage 64a, and the timer chamber 7 communicates with the atmosphere through the passage 64a, the passage 64, and the passage 65.

In the switch valve 6, the state in which the switch valve stem 61 is moved to the operating position is shown in FIGS. 3B to 3D described above. In the switch valve 6, when the switch valve stem 61 is moved to the operating position, the passage 64a is closed by the O-ring 61b, and the timer chamber 7 does not communicate with the atmosphere through the passage 64 and the passage 65. On the other hand, the O-ring 61a opens between the passage 63 and the passage 65, and the main chamber 13 communicates with the timer chamber 7 via the throttle 63a, the passage 63, and the passage 65.

4A and 4B are cross-sectional views showing an example of a timer chamber. The nailing machine 1 includes a timer chamber 7. The timer chamber 7 includes a chamber 70, a reset valve 71 that opens the chamber 70 to the atmosphere, and a spring 72 that urges the reset valve 71.

The chamber 70 has a predetermined volume, the air intake 70a communicates with the passage 65 of the switch valve 6, and the air outlet 70b communicates with the control valve 8 described later.

The reset valve 71 includes a cylinder 71a and a piston 71b that reciprocates in the cylinder 71a. In the reset valve 71, the cylinder 71a communicates with the return air chamber 14, and the piston 71b is pressed by the air supplied from the return air chamber 14.

The reset valve 71 includes an O-ring 71c that opens and closes a passage 70d that communicates with the exhaust port 70c of the chamber 70.

FIG. 4A shows a state in which the reset valve 71 has moved to the standby position in the timer chamber 7. In the timer chamber 7, when the reset valve 71 is moved to the standby position, the passage 70d is closed by the O-ring 71c, and the chamber 70 does not communicate with the atmosphere through the exhaust port 70c.

FIG. 4B shows a state in which the reset valve 71 is moved to the operating position in the timer chamber 7. In the timer chamber 7, when the reset valve 71 is moved to the operating position, the O-ring 71c opens the passage 70d, and the chamber 70 communicates with the atmosphere through the passage 70d and the exhaust port 70c.

5A and 5B are cross-sectional views showing an example of a control valve. The nailing machine 1 includes a control valve 8. The control valve 8 includes a cylinder 80, a piston 81 which is an operating member that reciprocates in the cylinder 80, and a spring 82 that urges the piston 81. Further, the control valve 8 includes a cylinder 83, a control valve stem 84 that is pressed by the piston 81 and reciprocates in the cylinder 83, and a spring 85 that urges the control valve stem 84 in the direction of the piston 81.

In the control valve 8, the cylinder 80 communicates with the outlet 70b of the timer chamber 7, and the piston 81 is pressed by the air supplied from the timer chamber 7.

In the control valve 8, passages 86 and 87 are formed between the cylinder 83 and the control valve stem 84. In the control valve 8, the passage 86 communicates with the passage 50 of the trigger valve 5, and the passage 87 communicates with the main chamber 13.

The control valve stem 84 includes an O-ring 84a that opens and closes between the head valve upper chamber 34 and the passage 86, and an O-ring 84b that opens and closes between the head valve upper chamber 34 and the passage 87.

FIG. 5A shows a state in which the piston 81 and the control valve stem 84 have moved to the standby position in the control valve 8. In the control valve 8, when the piston 81 is moved to the standby position, the control valve stem 84 is moved to the standby position. In the control valve 8, when the control valve stem 84 is moved to the standby position, the O-ring 84a opens the passage 86, and the head valve upper chamber 34 communicates with the passage 50 of the trigger valve 5 via the passage 86. On the other hand, the passage 87 is closed by the O-ring 84b, and the head valve upper chamber 34 does not communicate with the main chamber 13 via the passage 87.

FIG. 5B shows a state in which the piston 81 and the control valve stem 84 have moved to the operating position in the control valve 8. In the control valve 8, when the piston 81 is moved to the operating position, the control valve stem 84 is moved to the operating position. In the control valve 8, when the control valve stem 84 is moved to the operating position, the passage 86 is closed by the O-ring 84a, and the head valve upper chamber 34 does not communicate with the passage 50 of the trigger valve 5 via the passage 86. On the other hand, the O-ring 84b opens the passage 87, and the head valve upper chamber 34 communicates with the main chamber 13 via the passage 07.

<Example of operation of nailing machine>
6A to 6D are cross-sectional views showing an example of the operation of the nailing machine, and then the operation of the nailing machine 1 will be described. In the following operation, an operation called contact striking in which the contact arm 40 is pressed against the object while the trigger lever 4 is pulled will be described.

When an air hose (not shown) is connected, air is filled in the main chamber 13. However, as shown in FIG. 6A, in the OFF state in which the trigger lever 4 is not operated, the pilot valve 52 and the trigger valve stem 54 of the trigger valve 5 remain until the trigger lever 4 is operated and turned ON. It is in the standby position described with reference to FIG. 3A, and the switch valve stem 61 of the switch valve 6 is in the standby position. Further, the reset valve 71 of the timer chamber 7 is in the standby position described in FIG. 4A, and the piston 81 and the control valve stem 84 of the control valve 8 are in the standby position described in FIG. 5A. Further, the head valve piston 31 of the head valve 3 is in the standby position described with reference to FIG. 2A.

In the state where the trigger valve stem 54 of the trigger valve 5 is in the standby position described with reference to FIG. 3A, compressed air is supplied from the main chamber 13 to the vacant chamber 53a of the trigger valve 5, and the pilot valve 52 is moved to the standby position. Is held at. As a result, the gap S1 of the trigger valve 5 is opened, and the main chamber 13 and the passage 50 communicate with each other. On the other hand, the passage 50 does not communicate with the atmosphere through the passage 56.

Further, when the switch valve stem 61 of the switch valve 6 is in the standby position shown in FIG. 3A, the passage 64 is opened. As a result, the chamber 70 of the timer chamber 7 communicates with the atmosphere through the passage 64 of the switch valve 6. When the chamber 70 becomes atmospheric pressure, the piston 81 of the control valve 8 and the control valve stem 84 are held in a state of being moved to the standby position described with reference to FIG. 5A.

When the piston 81 of the control valve 8 and the control valve stem 84 are in the standby position, the passage 86 of the control valve 8 opens. As a result, compressed air is supplied from the main chamber 13 to the head valve upper chamber 34 via the passage 50 of the trigger valve 5 and the passage 86 of the control valve 8, and the head valve piston 31 is urged by the pressure of the compressed air and the spring 33. Moves to the bottom dead center, which is the standby position. Therefore, compressed air is not supplied from the main chamber 13 to the striking cylinder 2.

As shown in FIG. 6B, when the trigger lever 4 is pulled and turned on, the switch valve stem 61 of the switch valve 6 moves from the standby position to the operating position described in FIG. 3B.

When the switch valve stem 61 moves to the operating position of the switch valve 6, the passage 64 is closed and the timer chamber 7 does not communicate with the atmosphere through the passage 64. On the other hand, the passage 63 opens, and the main chamber 13 communicates with the timer chamber 7 via the throttle 63a and the passage 63.

As a result, the compressed air whose flow rate is limited by the throttle 63a flows into the chamber 70 of the timer chamber 7 through the passage 63. Therefore, the pressure in the chamber 70 of the timer chamber 7 starts to rise.

As shown in FIG. 6C, when the tip of the contact arm 40 is pressed against the object and becomes ON while the trigger lever 4 is pulled, the small lever 44 rotates upward and the trigger valve 5 The trigger valve stem 54 is pushed, and the trigger valve stem 54 moves from the standby position to the operating position described with reference to FIG. 3C.

In the trigger valve 5, the gap S2 is closed when the trigger valve stem 54 is moved to the operating position. As a result, compressed air does not flow into the vacant chamber 53a from the main chamber 13.

On the other hand, the vacant room 53a communicates with the atmosphere through the gap S3. As a result, the inside of the vacant chamber 53a becomes atmospheric pressure, and the pilot valve 52 is pushed by the pressure in the main chamber 13, so that the pilot valve 52 moves from the standby position to the operating position described in FIG. 3D.

In the trigger valve 5, the gap S1 is closed when the pilot valve 52 is moved to the operating position. On the other hand, the passage 50 and the passage 56 are opened, and the passage 50 communicates with the atmosphere through the passage 56.

In the control valve 8, when the piston 81 and the control valve stem 84 are in the standby position described with reference to FIG. 5A, the head valve upper chamber 34 communicates with the passage 50 of the trigger valve 5 via the passage 86. On the other hand, the passage 87 is closed, and the head valve upper chamber 34 does not communicate with the main chamber 13 via the passage 87.

As a result, when the pilot valve 52 moves to the operating position, the head valve upper chamber 34 becomes atmospheric pressure, and the head valve piston 31 is pushed by the pressure in the main chamber 13, so that the head valve piston 31 moves from the standby position to FIG. 2B. Move to the top dead point, which is the operating position explained in.

When the head valve piston 31 moves to the top dead center, the head valve piston 31 comes into contact with the head valve piston stopper 32 to open the space between the main chamber 13 and the air supply / exhaust port 22a of the striking piston stopper 22. As a result, compressed air is supplied from the main chamber 13 to the striking cylinder 2 through the air supply / exhaust port 22a.

Further, the exhaust port opening / closing portion 31a of the head valve piston 31 projects from the central opening of the head valve piston stopper 32 to the exhaust port 15 and closes between the exhaust port 15 and the supply / exhaust port 22a of the striking piston stopper 22. As a result, the compressed air supplied from the main chamber 13 to the striking cylinder 2 is not exhausted from the exhaust port 15. Therefore, the striking piston 20 is lowered, and the striking driver 21 launches a nail (not shown).

By the way, when the trigger lever 4 is pulled, the switch valve stem 61 moves to the operating position, and compressed air is supplied from the main chamber 13 into the chamber 70 of the timer chamber 7, and the pressure in the chamber 70 starts to rise. To do. However, the piston 81 of the control valve 8 is in the standby position until the pressure in the chamber 70 reaches the pressure for operating the control valve 8. As a result, the control valve stem 84 is in the standby position, and the state in which the head valve upper chamber 34 communicates with the passage 50 of the trigger valve 5 via the passage 86 is maintained.

Then, when the trigger lever 4 is pulled, the pressure in the chamber 70 of the timer chamber 7 starts to rise, the pressure in the chamber 70 reaches the pressure for operating the control valve 8, and the piston of the control valve 8 is operated. It takes a predetermined time until the 81 moves to the operating position.

Therefore, after the trigger lever 4 is pulled, the pressure in the chamber 70 reaches the pressure for operating the control valve 8, and the contact arm 40 is within a predetermined time until the piston 81 of the control valve 8 moves to the operating position. As described above, the head valve 3 operates, the striking piston 20 descends, and the striking driver 21 launches a nail (not shown).

As shown in FIG. 6D, when the striking piston 20 descends to a position where it passes through the small hole 14a, a part of the compressed air supplied from the main chamber 13 to the striking cylinder 2 passes through the small hole 14a and the return air chamber 14 Inflow to. A part of the compressed air that has flowed into the return air chamber 14 is supplied to the cylinder 71a of the reset valve 71.

As a result, the piston 71b is pushed, and the reset valve 71 moves from the standby position to the operating position shown in FIG. 4B. When the reset valve 71 moves to the operating position, the timer chamber 7 opens the passage 70d, and the chamber 70 communicates with the atmosphere through the passage 70d and the exhaust port 70c.

Therefore, while the trigger lever 4 is being pulled, the pressure in the chamber 70 of the timer chamber 7 that has risen with the passage of time becomes atmospheric pressure. Then, when the pressure in the return air chamber 14 drops, the reset valve 71 moves from the operating position to the standby position described with reference to FIG. 4A, and when the trigger lever 4 is continuously pulled, the chamber of the timer chamber 7 is used. The pressure in 70 begins to rise.

Therefore, when the contact arm 40 operates within a predetermined time after the trigger lever 4 is pulled and the pressure in the chamber 70 reaches the pressure for operating the control valve 8, the head valve 3 operates. Further, the inside of the chamber 70 of the timer chamber 7 becomes atmospheric pressure, and the control valve 8 does not operate. Therefore, if the contact arm 40 operates within a predetermined time after the trigger lever 4 is pulled, the nail can be continuously driven. Further, when the trigger lever 4 is pulled, the pressure in the chamber 70 of the timer chamber 7 starts to rise, and then if the operation of hitting a nail is executed, the pressure in the chamber 70 becomes atmospheric pressure, so that the timer chamber The timekeeping value using 7 will be cleared.

7A and 7B are cross-sectional views showing an example of the operation of the nailing machine in which the control valve is operated. The pressure in the chamber 70 of the timer chamber 7 rises over time while the trigger lever 4 is being pulled. Then, as shown in FIG. 7A, when the pressure in the chamber 70 reaches the pressure for operating the control valve 8, the piston 81 of the control valve 8 moves from the standby position to the operating position described in FIG. 5B, and the piston 81 Pushed to move the control valve stem 84 to the operating position. When the control valve stem 84 moves to the operating position, the control valve 8 closes the passage 86, and the head valve upper chamber 34 does not communicate with the passage 50 of the trigger valve 5 via the passage 86. On the other hand, the passage 87 opens, and the head valve upper chamber 34 communicates with the main chamber 13 via the passage 87.

As a result, as shown in FIG. 7B, even if the trigger valve stem 54 and the pilot valve 52 of the trigger valve 5 are operated by the operation of the contact arm 40, the head valve upper chamber 34 has the same pressure as the main chamber 13 and the head. The valve piston 31 does not move from the standby position. As described above, if the contact arm 40 does not operate for a predetermined time until the pressure in the chamber 70 reaches the pressure for operating the control valve 8 after the trigger lever 4 is pulled, the contact arm is not operated after a predetermined time. Even if 40 operates, the head valve 3 does not operate.

In the timing mechanism using the timer chamber 7 described above, the time required for the pressure in the chamber 70 to reach the pressure for operating the control valve 8 depends on the magnitude of the pressure in the main chamber 13. Further, the time required for the piston 81 of the control valve 8 to move from the standby position to the operating position is, in addition to the magnitude of the pressure in the main chamber 13, the operating amount of the piston 81 and the spring that serves as the operating load of the piston 81. It depends on the load of 82. Therefore, after the trigger lever 4 is pulled to turn on and the pressure in the chamber 70 starts to rise, the control valve stem 84 of the control valve 8 moves to the operating position, and the head valve 3 is deactivated. The time required for this depends on the pressure in the main chamber 13, the operating amount of the piston 81, and the load.

Therefore, in the nailing machine 1A of the first embodiment shown below, the flow rate of the compressed air supplied to the timer chamber 7 is changed according to the pressure in the main chamber 13, and the pressure in the chamber 70 is changed. The time required to reach the pressure for operating the control valve 8 is controlled to be constant regardless of the magnitude of the pressure in the main chamber 13.

In the nailing machine 1B of the second embodiment, the volume of the chamber 70 of the timer chamber 7B is changed according to the pressure in the main chamber 13, and the pressure in the chamber 70 becomes the pressure for operating the control valve 8. The time to reach is controlled to be constant regardless of the magnitude of the pressure in the main chamber 13.

In the nailing machine 1C of the third embodiment, the stroke of the reciprocating movement of the piston 81C of the control valve 8C is changed according to the pressure in the main chamber 13, and the time until the control valve 8C moves to the operating position. However, it is controlled so as to be constant regardless of the magnitude of the pressure in the main chamber 13.

In the nailing machine 1D of the fourth embodiment, the force of the spring 82D that urges the piston 81D of the control valve 8D is changed according to the pressure in the main chamber 13, and the control valve 8D moves to the operating position. The time until is controlled to be constant regardless of the magnitude of the pressure in the main chamber 13.

Further, the load when the piston 81 of the control valve 8 and the control valve stem 84 move changes depending on the temperature. For example, when the hardness of the O-ring changes depending on the temperature, the sliding resistance changes.

Therefore, in the nailing machine 1E of the fifth embodiment, the flow rate of the compressed air supplied to the timer chamber 7 is changed according to the temperature, and the time until the control valve 8 moves to the operating position is the temperature. It is controlled so as to be constant regardless.

<Structure example of the nailing machine of the first embodiment>
8A and 8B are cross-sectional views showing an example of a nailing machine according to the first embodiment. In the nailing machine 1A of the first embodiment, the same number is given to the same configuration as the nailing machine 1 described with reference to FIG. 1 and the like, and detailed description thereof will be omitted.

The nailing machine 1A includes a flow rate control valve 9A that controls the flow rate of compressed air supplied to the timer chamber 7 via the switch valve 6A. The flow rate control valve 9A is an example of a flow rate control mechanism, and is included in the grip portion 12. A cylinder 90, a flow rate control valve stem 91 that reciprocates in the cylinder 90, and a spring 92 that urges the flow rate control valve stem 91 are provided in the main chamber 13.

The flow rate control valve 9A includes a first throttle 90a and a second throttle 90b communicating with the passage 63 of the switch valve 6A, and a passage 90c communicating with the main chamber 13. Further, the flow rate control valve stem 91 includes an O-ring 91a that opens and closes the second throttle 90b.

In the flow rate control valve 9A, compressed air in the main chamber 13 is supplied into the cylinder 90 via the passage 90c, and the flow rate control valve stem 91 operates according to the pressure in the main chamber 13. When the pressure in the main chamber 13 is the first pressure, the flow control valve stem 91 is moved to the first position shown in FIG. 8A by the spring 92. On the other hand, the flow control valve stem 91 moves to the second position shown in FIG. 8B when the pressure in the main chamber 13 is a second pressure higher than the first pressure.

When the flow control valve stem 91 is moved to the first position, the first throttle 90a is opened and the second throttle 90b is opened by the O-ring 91a. As a result, the passage 63 of the switch valve 6A communicates with the main chamber 13 via the first throttle 90a and the second throttle 90b.

When the flow control valve stem 91 is moved to the second position, the first throttle 90a is opened and the second throttle 90b is closed by the O-ring 91a. As a result, the passage 63 of the switch valve 6A communicates with the main chamber 13 via the first throttle 90a.

When the switch valve stem 61 of the switch valve 6A moves to the operating position shown in FIG. 3B or the like, the passage 63 opens. As a result, when the flow control valve stem 91 is moved to the first position, the main chamber 13 communicates with the first throttle 90a and the second throttle 90b and the timer chamber 7 via the passage 63. Further, in the state where the flow control valve stem 91 is moved to the second position, the main chamber 13 communicates with the first throttle 90a and the timer chamber 7 via the passage 63.

Therefore, when the pressure in the main chamber 13 is a second pressure higher than the first pressure, the flow rate of the compressed air supplied to the chamber 70 of the timer chamber 7 is such that the pressure in the main chamber 13 is the first pressure. It decreases compared to the case where. Therefore, the flow rate of the compressed air supplied to the timer chamber 7 changes according to the pressure in the main chamber 13, and the time until the pressure in the chamber 70 reaches the pressure for operating the control valve 8 is the main. It can be controlled to be constant regardless of the magnitude of the pressure in the chamber 13. As a result, when performing contact striking, the time during which continuous striking operation is possible can be made constant.

<Structure example of the nailing machine of the second embodiment>
9A and 9B are cross-sectional views showing an example of a nailing machine according to a second embodiment. In the nailing machine 1B of the second embodiment, the same number is given to the same configuration as the nailing machine 1 described with reference to FIG. 1 and the like, and detailed description thereof will be omitted.

The nailing machine 1B includes a sub-chamber 73 and a sub-chamber opening / closing valve 74 as adjustment mechanisms in the timer chamber 7B. The sub-chamber opening / closing valve 74 includes a cylinder 75, a sub-chamber opening / closing valve stem 76 that reciprocates in the cylinder 75, and a spring 77 that urges the sub-chamber opening / closing valve stem 76.

The timer chamber 7B includes a passage 73a that connects the chamber 70 and the sub-chamber 73. Further, the cylinder 75 includes a passage 75a communicating with the main chamber 13. Further, the sub-chamber opening / closing valve stem 76 includes an O-ring 76a that opens / closes the passage 73a.

In the timer chamber 7B, the compressed air in the main chamber 13 is supplied into the cylinder 75 via the passage 75a, and the sub-chamber opening / closing valve stem 76 operates according to the pressure in the main chamber 13. When the pressure in the main chamber 13 is the first pressure, the sub-chamber opening / closing valve stem 76 is moved to the first position shown in FIG. 9A by the spring 77. On the other hand, the sub-chamber opening / closing valve stem 76 moves to the second position shown in FIG. 9B when the pressure in the main chamber 13 is a second pressure higher than the first pressure.

When the auxiliary chamber opening / closing valve stem 76 is moved to the first position, the passage 73a is closed by the O-ring 76a. As a result, the chamber 70 and the sub-chamber 73 do not communicate with each other. When the auxiliary chamber opening / closing valve stem 76 is moved to the second position, the passage 73a is opened by the O-ring 76a. As a result, the chamber 70 and the sub-chamber 73 communicate with each other.

When the switch valve stem 61 moves to the operating position shown in FIG. 3B or the like, the switch valve 6 opens the passage 63, and the main chamber 13 communicates with the chamber 70 of the timer chamber 7B via the passage 63.

When the sub-chamber opening / closing valve stem 76 is moved to the first position, compressed air flows from the main chamber 13 only into the chamber 70, and the pressure in the chamber 70 starts to rise. When the sub-chamber opening / closing valve stem 76 is moved to the second position, compressed air from the main chamber 13 flows into the sub-chamber 73 through the chamber 70 and the chamber 70, and the pressure in the chamber 70 and in the sub-chamber rises. Start.

Therefore, when the pressure in the main chamber 13 is a second pressure higher than the first pressure, the volume of the timer chamber 7B becomes the size of the chamber 70 and the sub-chamber 73 combined, and the pressure in the main chamber 13 becomes It increases compared to the case where it is the first pressure. Therefore, the volume of the timer chamber 7B changes according to the pressure in the main chamber 13, and the time until the pressure in the timer chamber 7B reaches the pressure for operating the control valve 8 is the pressure in the main chamber 13. It can be controlled to be constant regardless of the size of. As a result, when performing contact striking, the time during which continuous striking operation is possible can be made constant.

<Structure example of the nailing machine of the third embodiment>
10A and 10B are cross-sectional views showing an example of a nailing machine according to a third embodiment. In the nailing machine 1C of the third embodiment, the same number is given to the same configuration as the nailing machine 1 described with reference to FIG. 1 and the like, and detailed description thereof will be omitted.

The nailing machine 1C is connected to the control valve 8C as an adjustment mechanism with the cylinder 88C and the piston 81, and the sub-piston 89C reciprocates in the cylinder 88C and the spring 89Ca that urges the sub-piston 89C in the direction of the piston 81. To be equipped. The sub-piston 89C is an example of a sub-actuating member, which is provided coaxially with the piston 81 and controls the standby position of the piston 81.

The cylinder 88C includes a passage 88Ca communicating with the main chamber 13. The cylinder 88C is provided with the passage 88Ca at a position where the compressed air flowing in from the passage 88Ca presses the sub-piston 89C in the direction away from the control valve stem 84.

In the control valve 8C, compressed air in the main chamber 13 is supplied into the cylinder 88C via the passage 88Ca, and the sub-piston 89C operates according to the pressure in the main chamber 13. When the pressure in the main chamber 13 is the first pressure, the sub-piston 89C is moved to the first position shown in FIG. 10A by the spring 89Ca. On the other hand, the sub-piston 89C moves to the second position shown in FIG. 10B when the pressure in the main chamber 13 is a second pressure higher than the first pressure.

When the sub-piston 89C is moved to the first position, the standby position of the piston 81 approaches the control valve stem 84. As a result, the stroke of the piston 81 for moving the control valve stem 84 that has moved to the standby position to the operating position is shortened. When the sub-piston 89C is moved to the second position, the standby position of the piston 81 is separated from the control valve stem 84. As a result, the stroke of the piston 81 for moving the control valve stem 84 that has moved to the standby position to the operating position becomes longer.

Therefore, when the pressure in the main chamber 13 is a second pressure higher than the first pressure, the stroke of the piston 81 becomes longer. Therefore, the stroke of the piston 81 changes according to the pressure in the main chamber 13, and the time until the control valve stem 84 reaches the operating position is constant regardless of the magnitude of the pressure in the main chamber 13. Can be controlled. As a result, when performing contact striking, the time during which continuous striking operation is possible can be made constant.

<Structure example of the nailing machine of the fourth embodiment>
11A and 11B are cross-sectional views showing an example of a nailing machine according to a fourth embodiment. In the nailing machine 1D of the fourth embodiment, the same number is given to the same configuration as the nailing machine 1 described with reference to FIG. 1 and the like, and detailed description thereof will be omitted.

The nailing machine 1D includes a cylinder 88D and a spring load control piston 89D that reciprocates in the cylinder 88D as an adjusting mechanism in the control valve 8D. The spring load control piston 89D is an example of a load control member, which is provided coaxially with the piston 81 and controls the length of the spring 82 that urges the piston 81 in the expansion / contraction direction.

The cylinder 88D includes a passage 88Da that communicates with the main chamber 13. The cylinder 88D is provided with a passage 88Da at a position where the compressed air flowing in from the passage 88Da presses the spring load control piston 89D in the direction of compressing the spring 82.

In the control valve 8D, compressed air in the main chamber 13 is supplied into the cylinder 88D via the passage 88Da, and the spring load control piston 89D operates according to the pressure in the main chamber 13. When the pressure in the main chamber 13 is the first pressure, the spring load control piston 89D is moved by the spring 82 to the first position shown in FIG. 11A. On the other hand, the spring load control piston 89D moves to the second position shown in FIG. 11B when the pressure in the main chamber 13 is a second pressure higher than the first pressure.

When the spring load control piston 89D is moved to the first position, the spring load control piston 89D separates from the piston 81. As a result, the load of the spring 82 applied to the piston 81 in the standby position is weakened. In the state where the spring load control piston 89D is moved to the second position, the spring load control piston 89D approaches the piston 81. As a result, the load of the spring 82 applied to the piston 81 in the standby position becomes stronger.

Therefore, when the pressure in the main chamber 13 is a second pressure higher than the first pressure, the load of the spring 82 applied to the piston 81 in the standby position becomes stronger. Therefore, the load of the spring 82 applied to the piston 81 in the standby position changes according to the pressure in the main chamber 13, and the time until the control valve stem 84 reaches the operating position is the pressure in the main chamber 13. It can be controlled to be constant regardless of the size. As a result, when performing contact striking, the time during which continuous striking operation is possible can be made constant.

<Structure example of the nailing machine of the fifth embodiment>
12A and 12B are cross-sectional views showing an example of a nailing machine according to a fifth embodiment. In the nailing machine 1E of the fifth embodiment, the same number is given to the same configuration as the nailing machine 1 described with reference to FIG. 1 and the like, and detailed description thereof will be omitted.

The nailing machine 1E includes a flow rate control member 93 that controls the flow rate of compressed air supplied to the timer chamber 7 via the switch valve 6E. The flow rate control member 93 is an example of an adjustment mechanism, and the passage 63 of the switch valve 6E. It is made of a material having a coefficient of thermal expansion different from that of the material constituting the passage 63b communicating with. The passage 63b is made of metal (aluminum). The passage 63b may be made of the same material as the main body 10 and the grip portion 12. Further, the flow rate control member 93 is made of resin.

The flow rate control member 93 is attached to the inside of the passage 63b, and a gap S5 through which air passes is formed between the outer circumference of the flow rate control member 93 and the inner circumference of the passage 63b. The flow rate control member 93 functions as a throttle that regulates the flow rate in the passage 63b. Further, since the expansion / contraction ratio between the passage 63b and the flow control member 93 due to the temperature change is different, the dimension of the gap S5 between the outer circumference of the flow control member 93 and the inner circumference of the passage 63b changes depending on the temperature.

Therefore, at a temperature at which the sliding resistance of the piston 81 of the control valve 8 and the control valve stem 84 increases, the flow rate control member 93 increases the flow rate of the compressed air supplied to the chamber 70 of the timer chamber 7. The size of the gap S5 between the outer circumference and the inner circumference of the passage 63b is increased. Further, at a temperature at which the sliding resistance of the piston 81 of the control valve 8 and the control valve stem 84 decreases, the flow rate control member 93 reduces the flow rate of the compressed air supplied to the chamber 70 of the timer chamber 7. The size of the gap S5 between the outer circumference and the inner circumference of the passage 63b is reduced. In this example, the gap S5 between the passage 63b and the flow rate control member 93 expands as the temperature decreases.

Therefore, the flow rate of the compressed air supplied to the timer chamber 7 changes according to the temperature, and the time required for the control valve stem 84 to reach the operating position can be controlled to be constant regardless of the temperature. .. As a result, when performing contact striking, the time during which continuous striking operation is possible can be made constant.

In each of the above-described embodiments, the configuration in which the control valve 8 is arranged between the head valve 3 and the trigger valve 5 has been described, but the control valve 8 is provided at another location and supplied to the head valve upper chamber 34. The discharge of the compressed air may be controlled. For example, the control valve is provided not on the upstream side of the trigger valve but on the downstream side, the trigger valve is arranged between the head valve and the control valve, and a passage that communicates from the head valve upper chamber through the trigger valve to the control valve. May be formed so that the control valve can switch the opening and closing of the passage for discharging the compressed air in the upper chamber of the head valve to the atmosphere.

1, 1A, 1B, 1C, 1D, 1E ... O-ring machine, 10 ... Main body, 11 ... Nose, 11a ... Injection hole, 12 ... Grip part, 13 ... Main chamber (Chamber), 14 ... Return air chamber, 14a ... Small hole, 14b ... Check valve, 15 ... Exhaust port, 2 ... Blow cylinder, 20 ... Blow piston, 20a ... O-ring, 21 ... Strike driver, 22 ... Strike piston stopper, 22a ... Supply / exhaust port, 22b ... Recess, 3 ... Head valve (controlled object), 30 ... -Head valve cylinder, 31 ... Head valve piston, 31a ... Exhaust port opening / closing part, 32 ... Head valve piston stopper, 33 ... Spring, 34 ... Head valve upper chamber, 35 ... Head valve seal, 4 ... trigger lever, 40 ... contact arm, 40a ... pressing member, 40b ... compression spring, 41 ... shaft, 42 ... large lever, 43 ... shaft , 44 ... Small lever, 5 ... Trigger valve, 50 ... Passage, 51 ... Housing, 52 ... Pilot valve, 52a, 52b, 52c ... O-ring, 52d ... Passage , 53 ... Cap, 53a ... Vacancy, 54 ... Trigger valve stem, 54a, 54b ... O-ring, 55 ... Spring, 56 ... Passage, S1, S2, S3 ... Gap, 6 ... switch valve, 60 ... cylinder, 61 ... switch valve stem, 61a, 61b ... O-ring, 62 ... spring, 63, 63b, 64 ... passage, 63a ... O-ring, 64a ... passage, 65 ... passage, 7 ... timer chamber, 70 ... chamber, 70a ... intake, 70b ... outlet, 70c ... exhaust port , 70d ... passage, 71 ... reset valve, 71a ... cylinder, 71b ... piston, 71c ... O-ring, 72 ... spring, 73 ... sub-chamber (adjustment mechanism), 73a ... passage, 74 ... sub-chamber opening / closing valve (adjustment mechanism), 75 ... cylinder, 75a ... passage, 76 ... sub-chamber opening / closing valve stem, 76a ... O-ring, 77. ... Spring, 8 ... Control valve, 80 ... Cylinder, 81 ... Piston (acting member), 82 ... Spring, 83 ... Cylinder, 84 ... Control valve stem, 84a, 84b ... O-ring, 85 ... spring, 86, 87 ... passage, 88C ... cylinder, 88Ca ... Passage, 89C ... Sub-piston (secondary operating member), 89Ca ... Spring, 88D ... Cylinder, 88Da ... Passage, 89D ... Spring load control piston (load control member), 9A ... Flow control valve (flow control mechanism), 90 ... cylinder, 90a ... first throttle, 90b ... second throttle, 90c ... passage, 91 ... flow control valve stem, 91a ...・ ・ O-ring, 92 ・ ・ ・ Spring, 93 ・ ・ ・ Flow control member (adjustment mechanism)

Claims (13)

A chamber with a predetermined volume to which compressed air is supplied, and
A control valve that is connected to the chamber and switches the operation of the controlled object,
A pneumatic tool equipped with an adjustment mechanism for switching the operation of the control valve. The control valve comprises a pneumatically operated actuating member in the chamber.
The pneumatic tool according to claim 1, wherein the adjusting mechanism switches the operation of the operating member according to the air pressure of the compressed air supplied to the chamber. The pneumatic tool according to claim 1 or 2, wherein the adjusting mechanism includes a flow rate control mechanism that controls the flow rate of the compressed air supplied to the chamber according to the air pressure of the compressed air supplied to the chamber. .. The pneumatic tool according to claim 1 or 2, wherein the adjusting mechanism increases or decreases the volume of the chamber according to the air pressure of the compressed air supplied to the chamber. The adjusting mechanism includes a sub-chamber connected to the chamber and
A passage that communicates between the chamber and the sub-chamber,
The pneumatic tool according to claim 4, further comprising an auxiliary chamber opening / closing valve that opens / closes the passage according to the air pressure of compressed air supplied to the chamber. The pneumatic tool according to claim 2, wherein the adjusting mechanism includes an auxiliary operating member that controls an operating amount of the operating member of the control valve according to the air pressure of compressed air supplied to the chamber. The pneumatic tool according to claim 2, wherein the adjusting mechanism includes a load control member that controls a load of the operating member of the control valve according to the air pressure of compressed air supplied to the chamber. The pneumatic tool according to claim 1, wherein the adjusting mechanism switches the operation of the control valve according to the temperature. The adjustment mechanism includes a passage through which compressed air passes and
The pneumatic tool according to claim 8, further comprising the passage and a flow control member made of a material having a different coefficient of thermal expansion. The pneumatic tool according to claim 9, wherein the passage and the flow rate control member are made of a combination of materials in which the gap between the passage and the flow rate control member expands as the temperature decreases. The pneumatic tool according to claim 9 or 10, wherein the passage and the flow rate control member constitute a throttle that regulates the flow rate of compressed air passing through the passage. A striking piston connected to a striking driver that launches a nail supplied in the nose,
A striking cylinder in which the striking piston reciprocates and
A head valve that communicates with and shuts off the inside of the main chamber to which compressed air is supplied and the striking cylinder.
A trigger lever that receives an operation to operate the head valve,
A contact arm that can reciprocate in the axial direction of the nose,
A trigger valve that operates the head valve by the operation of the trigger lever and the contact arm, and
A switch valve for supplying compressed air from the main chamber to the chamber by the operation of the trigger lever is provided.
The control valve is
The pneumatic tool according to any one of claims 1 to 11, which switches the opening and closing of a passage that communicates the trigger valve and the head valve. A striking piston connected to a striking driver that launches a nail supplied in the nose,
A striking cylinder in which the striking piston reciprocates and
A head valve that communicates with and shuts off the inside of the main chamber to which compressed air is supplied and the striking cylinder.
A trigger lever that receives an operation to operate the head valve,
A contact arm that can reciprocate in the axial direction of the nose,
A trigger valve that operates the head valve by the operation of the trigger lever and the contact arm, and
A switch valve for supplying compressed air from the main chamber to the chamber by the operation of the trigger lever is provided.
The control valve is
The pneumatic tool according to any one of claims 1 to 11, wherein the opening and closing of a passage for discharging the compressed air in the upper chamber of the head valve for storing the compressed air for operating the head valve is switched.

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