TW202100311A - Pneumatic tool - Google Patents

Abstract

This pneumatic tool (1A) is provided with: a chamber (70) having a predetermined volume in which compressed air is supplied; a control valve (8) that is connected to the chamber (70) and switches the actuation and non-actuation of an object to be controlled (3); and an adjustment mechanism that switches the operation of the control valve (8).

Description

Pneumatic tools

The invention relates to a pneumatic tool that uses compressed air as a power source to actuate.

The compressed air is used as the power source to move the percussion piston back and forth to drive the driver combined with the percussion piston to drive the nail body supplied to the nose. The pneumatic tool called the nailing machine is well known. In this type of nailing machine, its structure is operated by pulling one of the triggers provided in the grip portion, and pressing against the contact arm provided to protrude to the tip of the nose so as to be reciprocally movable, to be driven in The other operation of the material is two operations, and the head valve is activated to drive the nail body.

In the following description, the state after the trigger is pulled by an operation is called trigger ON, and the state when an operation is released but the trigger is not pulled is called trigger OFF. In addition, the state where the contact arm is pressed by another operation is called ON of the contact arm, and the state where the other operation is released but the contact arm is not pressed is called OFF of the contact arm.

In the nailing machine, for example, after the contact arm is turned ON, in the state after the contact arm is turned ON, if the trigger is turned ON and the head valve is actuated, the nail body is driven.

There is a proposal that after driving the nail body, when the trigger is turned on, the contact arm is turned off, and when the trigger is turned on, the contact arm is turned on again, whereby the head valve is actuated to perform The next nail-in technology. In this way, the ON and OFF of the contact arm will be repeated while the trigger is ON, thereby performing continuous nail penetration, which is called contact percussion.

In contact knocking, after driving the nail body, with the trigger turned on, the nail body is continuously driven every time the contact arm is turned on, so it is very suitable for rapid operation. In contrast to this, in order to limit careless movements, after the trigger is turned ON, after a predetermined time has elapsed without the contact arm being turned ON, a technique has been proposed to deactivate the head valve (see Patent Document 1). [Patent Literature]

[Patent Document 1] Japanese Jikhokai No. 6-32308

When the trigger is turned on, the head valve does not operate after a predetermined time has passed without turning the contact arm on. If the predetermined time elapses, it can be stably measured by an electrical timer. . However, nailing machines driven by compressed air do not include electrical supply sources. Therefore, in order to use an electrical timer, a power supply and a circuit are required.

In contrast, Patent Document 1 proposes a timing mechanism that utilizes the pressure of compressed air in the main cavity for storing compressed air used to actuate the nailing machine. The structure of the timing mechanism using air pressure is, for example, an autonomous cavity supplies compressed air to a space of a predetermined volume, and when the space becomes a predetermined pressure, the valve body is actuated by the air pressure.

In this kind of timing mechanism, no power supply and loop are needed. However, the pressure of compressed air supplied from an unillustrated air compressor is not always constant, or the compressed air in the main cavity is consumed due to the action of driving the nail body, etc., thereby, The pressure in the main cavity fluctuates, so the time until the space becomes the predetermined pressure for the actuating valve body is not constant. Therefore, it is difficult for a nailing machine with a timing mechanism that uses air pressure to perform timing stably. The time from pulling the trigger to stopping the head valve is not constant.

The object of the present invention is to provide a pneumatic tool that is not affected by variable factors such as air pressure, and can stably and stably perform timing so as to steadily switch between contact and knocking.

The invention is a pneumatic tool, which includes: a cavity with a predetermined volume supplied with compressed air; a control valve connected with the cavity to switch whether the controlled object is operated; and an adjustment mechanism that switches the operation of the control valve. [Invention Effect]

In the present invention, it is possible to provide a pneumatic tool that is not affected by variable factors such as air pressure, and can stably and stably perform timing, so as to stably switch whether to perform contact percussion.

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

＜Structure example of nailing machine＞ Fig. 1 is a side sectional view showing an example of the nailing machine. In Figure 1, it shows the state where the knocking piston is at the top dead center.

The nailing machine 1 includes a percussion cylinder 2 inside the body 10. The percussion cylinder 2 is provided so that the percussion piston 20 can slide inside. The percussion piston 20 is in a form protruding from the lower side, and a percussion driver 21 as a nail body driving member is fixed, and the percussion piston 20 and the percussion driver 21 move integrally. In addition, the percussion piston 20 is provided with an O-ring 20a as a sealing member on the outer periphery.

The nailing machine 1 is attached to the lower end of the main body 10 and includes a nose 11. The nose body 11 guides the injection hole 11a of the percussion driver 21 and is set coaxially with the percussion cylinder 2.

The nailing machine 1 includes a main cavity 13 for storing compressed air supplied to the inside of the grip 12 of the main body 10 and the periphery of the striking cylinder 2. By the compressed air supplied to the striking cylinder 2, the striking piston 20 of the nailing machine 1 is driven. The compressed air used to drive the knocking piston 20 is supplied to the knocking cylinder 2 through the main cavity 13.

The nailing machine 1 is attached to the outer peripheral side of the percussion cylinder 2 and includes a return air cavity 14 independent of the main cavity 13. The percussion cylinder 2 is located slightly in the middle of the axial direction, and a plurality of small holes 14a are formed in the radial direction. The small holes 14a and the return air chamber 14 communicate with each other through a check valve 14b.

The knock cylinder 2 is attached to the upper end and includes a knock piston stopper 22. The percussion piston stopper 22 protrudes from the upper end of the percussion cylinder 2 toward the inner circumference, and contacts the percussion piston 20 after returning to the top dead center. In addition, the knocking piston stopper 22 is an opening in the center of the upper end of the knocking cylinder 2. Thereby, the percussion cylinder 2 is located at the center of the upper end, and an air supply and exhaust port 22a through which the compressed air supplied from the main cavity 13 passes is formed.

The percussion cylinder 2 is in a state where the percussion piston 20 is located at the top dead center, and includes a recess 22b on the inner peripheral surface near the upper end opposite to the O-ring 20a of the percussion piston 20. When the knocking piston 20 returns to the top dead center, the O-ring 20a of the knocking piston 20 enters the recess 22b of the knocking cylinder 2, thereby creating a gap between the O-ring 20a and the recess 22b, and returning to the knocking The air of the piston 20 is discharged from this gap, and the driving force for striking the piston 20 is lost. Thereby, the knocking piston 20 is stopped at the top dead center.

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

The head valve 3 is attached to the upper part of the head valve piston 31 and includes a head valve piston stopper 32. The head valve piston 31 is arranged between the head valve piston stopper 32 and the knocking piston stopper 22, and is pressed by the spring 33 in the direction of the knocking piston stopper 22 which is the direction of the bottom dead center.

The head valve piston 31 is in contact with the knocking piston stopper 22, thereby forming a shape that blocks the main cavity 13 and the air supply and exhaust port 22a of the knocking piston stopper 22. In addition, the head valve piston 31 is in contact with the knocking piston stopper 22, thereby including an exhaust port opening and closing portion 31a having an opening communicating with the supply and exhaust port 22a of the knocking piston stopper 22.

The head valve piston 31 is an opening where the exhaust port opening and closing portion 31a enters the center of the head valve piston stopper 32, opens and closes the exhaust port 15 provided on the upper end side of the main body 10, and the supply and discharge of the knock piston stopper 22 Between the air ports 22a.

The head valve 3 is connected between the head valve piston 31 and the head valve piston stopper 32, and a head valve upper chamber 34 is formed. The head valve upper chamber 34 is communicated with the trigger valve 5 or the main chamber 13 through the control valve 8 described later. Moreover, the head valve upper chamber 34 is connected to the main chamber 13 or the atmosphere through the trigger valve 5.

In the head valve 3. The state where the head valve piston 31 moves to the bottom dead center as the standby position is shown in FIG. 2A. In the state after the head valve piston 31 moves to the bottom dead center, the head valve piston 31 is in contact with the knocking piston stopper 22, whereby the main cavity 13 and the supply and exhaust of the knocking piston stopper 22 The tie between the ports 22a is closed. Thereby, the involuntary cavity 13 supplies compressed air to the knock cylinder 2.

In addition, a head valve upper chamber 34 is formed between the head valve piston 31 and the head valve piston stopper 32. Furthermore, the exhaust port opening/closing portion 31a of the head valve piston 31 is lowered in the central opening of the head valve piston stopper 32, opening the exhaust port 15 and the air supply and exhaust port 22a of the knocking piston stopper 22 between. Thereby, in the percussion cylinder 2, the space on the upper side than the percussion piston 20 communicates with the atmosphere.

In the head valve 3, the head valve piston 31 is moved to the state after the dead center above the operating position, as shown in FIG. 2B. When the head valve piston 31 moves to the top dead center, the head valve piston 31 is in contact with the head valve piston stopper 32, thereby opening the supply and discharge of the main chamber 13 and the knocking piston stopper 22 Between the air ports 22a. Thereby, the compressed air is supplied to the knock cylinder 2 through the main cavity 13 through the supply and exhaust port 22a.

In addition, the exhaust port opening and closing portion 31a of the head valve piston 31 protrudes from the opening in the center of the head valve piston stopper 32 toward the exhaust port 15. The tip of the exhaust port opening and closing portion 31a is provided in The head valve seal 35 of the sealing member above the head valve 3 contacts, thereby closing the exhaust port 15 and the air supply and exhaust port 22a of the knock piston stopper 22. In this way, the compressed air is supplied to the knock cylinder 2 from the main cavity 13 but is not discharged from the exhaust port 15.

As shown in FIG. 1, the nailing machine 1 includes a trigger link 4 and a contact arm 40. The trigger link 41 includes: a dalian rod 42 rotatably installed on the main body 10 through a shaft 41; and a small link 44 that is rotatably installed on the dalian rod 42 through a shaft 43.

The contact arm 40 is connected to the pressing member 40a. The pressing member 40a abuts against the small link, while the contact arm 40 is installed to pass through the compression spring 40b to be able to reciprocate along the axial direction (up and down direction) of the nose 11. In addition, the structure of the contact arm 40 is pushed by the compression spring 40b so as to protrude more than the tip of the nose body 11. By pressing the tip of the contact arm 40 against the object, the small link 44 is rotated upward.

3A, 3B, 3C, and 3D are cross-sectional views showing examples of trigger valves and on-off valves. The nailing machine 1 includes a trigger valve 5 inside the base end of the grip 12. The trigger valve 5 is used to be pressed by the small connecting rod 44 to transmit the actuation signal to the head valve 3.

The trigger valve 5 includes a housing 51 formed with a passage 50 that communicates with a head valve upper chamber 34 through a control valve 8 described later, and a pilot valve 52 that is mounted to the housing 51 so as to move up and down. In addition, the trigger valve 5 series includes: a trigger valve stem 54 installed so as to come and go from the pilot valve 52 relative to the cover 53; and a spring 55, which is arranged between the pilot valve 52 and the trigger valve stem 54, Press the trigger valve stem 54 downward. Moreover, the trigger valve 5 includes a passage 56 communicating with the atmosphere.

The trigger valve 5 is connected between the pilot valve 52 and the housing 51 to form a gap S1, between the pilot valve 52 and the trigger valve stem 54, a gap S2 is formed, and between the trigger valve stem 54 and the cover 53, a gap S2 is formed. There is a gap S3. In addition, a cavity 53 a is formed between the pilot valve 52 and the cover 53.

The pilot valve 52 corresponds to the position of the pilot valve 52 relative to the housing 51, and includes: an O-ring 52a, with respect to the main cavity 13, an opening and closing gap S1; and an O-ring 52b, which opens and closes the passage 50 and the passage 56 In between, the passage 56 communicates with the passage 50 and the atmosphere. In addition, the pilot valve 52 includes an O-ring 52c that seals the cavity 53a and the passage 56. In addition, the pilot valve 52 includes a passage 52d communicating with the main chamber 13.

The trigger valve stem 54 corresponds to the position of the pilot valve 52 and the trigger valve stem 54 relative to the housing 51 and the cover 53, including: an O-ring 54a, relative to the main cavity 13, the opening and closing gap S2; and an O-shaped The ring 54b opens and closes the gap S3 with respect to the atmosphere.

In the trigger valve 5, the pilot valve 52 moves to the standby position, and the state after the trigger valve stem 54 moves to the standby position is shown in FIGS. 3A and 3B. The trigger valve 5 is in a state after 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. In contrast, the O-ring 52a of the pilot valve 52 is away from the housing 51 to open the gap S1, and the passage 50 passes through the gap S1 to communicate with the main cavity 13.

In addition, the trigger valve 5 is in a state after the trigger valve stem 54 is moved to the standby position, the O-ring 54b of the trigger valve stem 54 is in contact with the cover 53, and the gap S3 is closed. In contrast, the O-ring 54a of the trigger valve stem 54 is away from the pilot valve 52 to open the gap S2, and the cavity 53a passes through the passage 52d and the gap S2 to communicate with the main cavity 13.

In the trigger valve 5, the pilot valve 52 moves to the standby position, and the trigger valve stem 54 moves to the actuated position, as shown in FIG. 3C. The trigger valve 5 is in the state after the trigger valve stem 54 is moved to the actuating position, the O-ring 54a of the trigger valve stem 54 is in contact with the pilot valve 52, and the gap S2 is closed. In contrast, the O-ring 54b of the trigger valve stem 54 is away from the cover body 53, and opens the gap S3, and the cavity 53a penetrates the gap S3 to communicate with the atmosphere.

In the trigger valve 5, the pilot valve 52 moves to the actuated position, and the state after the trigger valve stem 54 moves to the actuated position is shown in FIG. 3D. The trigger valve 5 is in the state after the pilot valve 52 is moved to the actuating position, the pilot valve 52 is in contact with the cover 53 and the cavity 53a is not formed. In addition, the O-ring 52a of the pilot valve 52 is in contact with the housing 51, and the gap S1 is closed. In contrast, the O-ring 52b of the pilot valve 52 is away from the housing 51, the passage 50 and the passage 56 are opened, and the passage 50 penetrates the passage 56 to communicate with the atmosphere.

The nailing machine 1 includes a switch valve 6 in parallel with the trigger valve 5. The switch valve 6 series includes: a pressure cylinder 60; a switch valve stem 61 that reciprocates in the pressure cylinder 60; and a spring 62 that pushes the switch valve stem 61 downward. The on-off valve 6 is pushed by the spring 62, and the lower end of the on-off valve rod 61 is abutted against the Dalian rod 42, and actuated by the pulling action of the Dalian rod 42.

The on-off valve 6 is connected between the pressure cylinder 60 and the on-off valve stem 61, and passages 63 and 64 are formed. The on-off valve 6 is a passage 63 that passes through the orifice 63a to communicate with the main cavity 13, and the passage 64 is a passage 64a to communicate with the atmosphere. In addition, the on-off valve 6 has a passage 63 or a passage 64 through the passage 65 to communicate with the timing chamber 7 described later.

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

In the on-off valve 6, the state after the on-off valve stem 61 has moved to the standby position is shown in FIG. 3A described above. The on-off valve 6 is in the state after the on-off valve stem 61 is moved to the standby position, and the O-ring 61a closes the passage 63 and the passage 65. The main cavity 13 does not penetrate the passage 65 to communicate with the timing chamber 7. In contrast, the O-ring 61b opens the passage 64a, and the timing chamber 7 passes through the passage 64a, the passage 64, and the passage 65 to communicate with the atmosphere.

In the on-off valve 6, the state after the on-off valve stem 61 is moved to the actuated position is shown in FIGS. 3B to 3D described above. The on-off valve 6 closes the passage 64a with an O-ring 61b when the on-off valve stem 61 is moved to the actuating position, and the timing chamber 7 does not penetrate the passage 64 and the passage 65 to communicate with the atmosphere. In contrast, the O-ring 61a opens the passage 63 and the passage 65, and the main cavity 13 passes through the orifice 63a, the passage 63, and the passage 65 to communicate with the timing chamber 7.

4A and 4B are cross-sectional views showing an example of a timing chamber. The nailing machine 1 includes a timing cavity 7. The timing chamber 7 includes: a chamber 70; a reset valve 71 to open the chamber 70 to the atmosphere; and a spring 72 to push the reset valve 71.

The cavity 70 has a predetermined volume, the air intake 70a is connected to the passage 65 of the switch valve 6, and the air intake 70b is connected to the control valve 8 described later.

The reset valve 71 includes: a cylinder 71a; and a piston 71b, which reciprocates in the cylinder 71a. The reset valve 71 connects the pressure cylinder 71a with the return air chamber 14 to press the piston 71b with 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 communicating with the exhaust port 70c of the cavity 70.

In the timing chamber 7, the state after the reset valve 71 is moved to the standby position is shown in FIG. 4A. After the reset valve 71 is moved to the standby position, the timing chamber 7 closes the passage 70d with an O-ring 71c, and the chamber 70 does not pass through the exhaust port 70c to communicate with the atmosphere.

In the timing chamber 7, the state after the reset valve 71 is moved to the active position is shown in FIG. 4B. The timing chamber 7 is in the state after the reset valve 71 is moved to the active position, the O-ring 71c opens the passage 70d, and the chamber 70 passes through the passage 70d and the exhaust port 70c to communicate with the atmosphere.

5A and 5B are cross-sectional views showing an example of a control valve. The nailing machine 1 series includes a control valve 8. The control valve 8 includes: a pressure cylinder 80; a piston 81 as an actuating member that reciprocates in the pressure cylinder 80; and a spring 82 that pushes the piston 81. In addition, the control valve 8 includes: a pressure cylinder 83; a control valve rod 84, which is pressed by the piston 81 and reciprocates in the pressure cylinder 83; and a spring 85, which pushes the control valve rod 84 in the direction of the piston 81.

The control valve 8 is a cylinder 80 that communicates with the take-out port 70 b of the timing chamber 7, and presses the piston 81 with the air supplied from the timing chamber 7.

The control valve 8 is connected between the pressure cylinder 83 and the control valve stem 84, and passages 86 and 87 are formed. The passage 86 of the control valve 8 communicates with the passage 50 of the trigger valve 5, and the passage 87 communicates with the main cavity 13.

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

In the control valve 8, the state after the piston 81 and the control valve rod 84 have moved to the standby position is shown in FIG. 5A. The control valve 8 moves the control valve rod 84 to the standby position when the piston 81 moves to the standby position. The control valve 8 is in the state after 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 passes through the passage 86 to communicate with the passage 50 of the trigger valve 5. In contrast, the passage 87 is closed by an O-ring 84b, and the head valve upper chamber 34 is impermeable to the passage 87 so as to communicate with the main cavity 13.

In the control valve 8, the state after the piston 81 and the control valve rod 84 have moved to the actuated position is shown in FIG. 5B. The control valve 8 is in a state after the piston 81 has moved to the actuating position, and the control valve rod 84 is moved to the actuating position. The control valve 8 closes the passage 86 with an O-ring 84a after the control valve stem 84 is moved to the actuated position, and the head valve upper chamber 34 is impermeable to the passage 86 to communicate with the passage 50 of the trigger valve 5. In contrast, the O-ring 84b opens the passage 87, and the head valve upper chamber 34 penetrates the passage 07 to communicate with the main chamber 13.

＜Action example of nailing machine＞ 6A to 6D are cross-sectional views showing an example of the operation of the nailing machine. Next, the operation of the nailing machine 1 will be described. In the following actions, the action of pressing the contact arm 40 against the object in the state after the trigger link 4 is pulled is described as a contact knocking action.

When an unshown air hose is connected, air is filled into the main cavity 13. However, as shown in FIG. 6A, in the OFF state where the trigger link 4 is not operated, until the trigger link 4 is operated to become the ON state, the pilot valve 52 of the trigger valve 5 and the trigger valve stem 54 are in the figure In the standby position described in 3A, the on-off valve stem 61 of the on-off valve 6 is in the standby position. In addition, the reset valve 71 of the timing 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. Moreover, the head valve piston 31 of the head valve 3 is in the standby position described in FIG. 2A.

When the trigger valve stem 54 of the trigger valve 5 is in the standby position described in FIG. 3A, the compressed air is supplied to the cavity 53a of the trigger valve 5 from the main cavity 13, and the pilot valve 52 is moving to The state after the standby position is maintained. Thereby, the gap S1 of the trigger valve 5 is opened, and the passage 50 is in communication with the main cavity 13. In contrast, the passage 50 does not pass through the passage 56 to communicate with the atmosphere.

Furthermore, when the on-off valve stem 61 of the on-off valve 6 is in the standby position shown in FIG. 3A, the passage 64 is opened. Thereby, the cavity 70 of the timing cavity 7 passes through the passage 64 of the on-off valve 6 to communicate with the atmosphere. When the cavity 70 becomes atmospheric pressure, the piston 81 and the control valve stem 84 of the control valve 8 are moved to the standby position described in FIG. 5A and held.

When the piston 81 and the control valve rod 84 of the control valve 8 are in the standby position, the passage 86 of the control valve 8 is opened. Thereby, compressed air is supplied to the head valve upper chamber 34 from the main cavity 13 through the passage 50 of the trigger valve 5 and the passage 86 of the control valve 8. The pressure of the compressed air and the pressure of the spring 33 make the head valve piston The 31 series moves to the bottom dead center as the standby position. Therefore, the compressed air is supplied to the knock cylinder 2 involuntarily from the cavity 13.

As shown in FIG. 6B, when the trigger link 4 is pulled to be in the ON state, the on-off valve stem 61 of the on-off valve 6 moves from the standby position to the actuating position described in FIG. 3B.

When the on-off valve 6 is moved to the actuating position, the passage 64 is closed, and the timing chamber 7 does not pass through the passage 64 to communicate with the atmosphere. In contrast, the passage 63 is opened, and the main cavity 13 passes through the orifice 63a and the passage 63 to communicate with the timing cavity 7.

Thereby, the compressed air whose flow rate is restricted by the orifice 63a flows into the cavity 70 of the timing cavity 7 through the passage 63. Therefore, the pressure in the cavity 70 of the timing cavity 7 starts to rise.

As shown in FIG. 6C, in the ON state after the trigger link 4 is pulled, the tip of the contact arm 40 is pressed against the object to become the ON state, the small link 44 is rotated to the upper side, triggering The trigger valve stem 54 of the valve 5 is pushed, and the trigger valve stem 54 moves from the standby position to the actuating position described in FIG. 3C.

The trigger valve 5 is in the state after the trigger valve stem 54 is moved to the actuating position, and the gap S2 is closed. Thereby, the compressed air flows into the cavity 53a involuntarily from the cavity 13.

In contrast, the empty chamber 53a penetrates the gap S3 to communicate with the atmosphere. Thereby, the inside of the cavity 53a becomes atmospheric pressure, and the pilot valve 52 is pushed by the pressure in the main cavity 13, whereby the pilot valve 52 moves from the standby position to the actuating position described in FIG. 3D.

The trigger valve 5 is in the state after the pilot valve 52 is moved to the actuating position, and the gap S1 is closed. In contrast, the passage 50 and the passage 56 are open, and the passage 50 passes through the passage 56 to communicate with the atmosphere.

In the control valve 8, the piston 81 and the control valve rod 84 are in the standby position described in FIG. 5A, and the head valve upper chamber 34 is through the passage 86 to communicate with the passage 50 of the trigger valve 5. In contrast, the passage 87 is closed, and the head valve upper chamber 34 does not penetrate the passage 87 to communicate with the main chamber 13.

Thereby, when the pilot valve 52 moves to the actuating position, the head valve upper chamber 34 becomes atmospheric pressure, and the head valve piston 31 is pushed by the pressure in the main cavity 13, whereby the head valve piston 31 is moved from the standby position , Move to the upper dead center as described in Figure 2B as the actuation position.

When the head valve piston 31 moves to the top dead center, the head valve piston 31 is in contact with the head valve piston stopper 32, thereby opening the main cavity 13 and the air supply and exhaust port 22a of the knocking piston stopper 22 between. Thereby, the compressed air is supplied to the knock cylinder 2 through the main cavity 13 through the supply and exhaust port 22a.

In addition, the exhaust port opening and closing portion 31a of the head valve piston 31 is an opening at the center of the head valve piston stopper 32 and protrudes toward the exhaust port 15 to close the exhaust port 15 and the blower piston stopper 22. Between the exhaust ports 22a. Thereby, the compressed air supplied to the percussion cylinder 2 from the main cavity 13 is not discharged from the exhaust port 15. Therefore, the knocking piston 20 is lowered, and the not-shown nail body is knocked out by the knocking driver 21.

In addition, when the trigger link 4 is pulled, the switch valve rod 61 is moved to the actuated position, whereby the compressed air is supplied from the main cavity 13 to the cavity 70 of the timing cavity 7 and the cavity 70 The pressure began to rise. However, until the pressure in the cavity 70 reaches the pressure at which the control valve 8 is actuated, the piston 81 of the control valve 8 is in the standby position. Thereby, the control valve rod 84 is in the standby position, and the head valve upper chamber 34 is maintained in the permeable passage 86 and communicated with the passage 50 of the trigger valve 5.

Moreover, with the trigger link 4 being pulled, the pressure in the cavity 70 of the timing chamber 7 starts to rise, the pressure in the cavity 70 reaches the pressure of the actuation control valve 8, and the piston 81 of the control valve 8 moves It takes a predetermined amount of time to reach the actuation position.

Therefore, after the trigger link 4 is pulled, the pressure in the cavity 70 reaches the pressure of the actuation control valve 8, and the piston 81 of the control valve 8 moves to the actuation position within a predetermined time. When the contact arm 40 is actuated, as described above As mentioned, the head valve 3 is actuated, the knocking piston 20 is lowered, and the knocking driver 21 is used to drive a nail body not shown.

As shown in Fig. 6D, when the knocking piston 20 descends to the position through the small hole 14a, a part of the compressed air supplied to the knocking cylinder 2 from the main cavity 13 flows in through the small hole 14a Air cavity 14 for return. A part of the compressed air flowing into the return air chamber 14 is supplied to the pressure cylinder 71 a of the reset valve 71.

Thereby, the piston 71b is pushed, and the reset valve 71 is moved from the standby position to the actuating position shown in FIG. 4B. The timing chamber 7 opens the passage 70d when the reset valve 71 moves to the active position, and the chamber 70 passes through the passage 70d and the exhaust port 70c to communicate with the atmosphere.

Therefore, during the time when the trigger link 4 is pulled, the pressure in the cavity 70 of the timing cavity 7 that rises with the passage of time becomes atmospheric pressure. Moreover, when the pressure in the return air cavity 14 decreases, the reset valve 71 is automatically moved to the standby position described in FIG. 4A. When the trigger link 4 continues to be pulled, the timer cavity 7 The pressure in the cavity 70 starts to rise.

Therefore, after the trigger link 4 is pulled and the pressure in the cavity 70 reaches the pressure of the actuation control valve 8, the head valve 3 is actuated when the contact arm 40 is actuated. In addition, the inside of the chamber 70 of the timing chamber 7 becomes atmospheric pressure, and the control valve 8 does not operate. Therefore, after the trigger link 4 is pulled, if the contact arm 40 moves within a predetermined time, it is possible to continuously strike the nail body. Moreover, by pulling the trigger link 4, after the pressure in the cavity 70 of the timing cavity 7 starts to rise, if the action of striking the nail body is executed, the pressure in the cavity 70 becomes atmospheric pressure. Therefore, use the timing The timing value after cavity 7 becomes cleared.

7A and 7B are cross-sectional views showing an example of the operation of the nailing machine after the control valve is actuated. The pressure in the cavity 70 of the timer cavity 7 is increased with the passage of time during the period when the trigger link 4 is pulled. Moreover, as shown in FIG. 7A, when the pressure in the cavity 70 reaches the pressure to actuate the control valve 8, the piston 81 of the control valve 8 moves from the standby position to the actuated position described in FIG. 5B, and the control valve The rod 84 is pushed by the piston 81 to move to the actuating position. When the control valve 8 is moved to the actuated position, the passage 86 is closed, and the upper chamber 34 of the head valve does not penetrate the passage 86 to communicate with the passage 50 of the trigger valve 5. In contrast, the passage 87 is opened, and the head valve upper chamber 34 passes through the passage 87 to communicate with the main chamber 13.

As a result, as shown in FIG. 7B, even when the trigger valve stem 54 of the trigger valve 5 and the pilot valve 52 are actuated by the action of the contact arm 40, the head valve upper chamber 34 becomes the same pressure as the main chamber 13, and the head valve piston The 31 series does not move from the standby position. In this way, after the trigger link 4 is pulled, when the pressure in the cavity 70 reaches the pressure of the control valve 8 for a predetermined time, when the contact arm 40 does not move, after a predetermined time, even if the contact arm 40 moves, and the head valve 3 does not move.

In the timing mechanism using the timing chamber 7 described above, the time until the pressure in the chamber 70 reaches the pressure of the actuation control valve 8 depends on the pressure in the main chamber 13. In addition, the time until the piston 81 of the control valve 8 moves from the standby position to the actuated position is not only the pressure in the main chamber 13, but also depends on the amount of movement of the piston 81 and the load on which the piston 81 acts. The load of the spring 82. Therefore, the time from when the trigger link 4 is pulled to the ON state, the pressure in the cavity 70 starts to rise, and the control valve rod 84 of the control valve 8 moves to the actuated position so that the head valve 3 is not actuated, It depends on the pressure in the main cavity 13, the momentum of the piston 81, and the load.

Here, in the nailing machine 1A of the first embodiment shown below, it is controlled so that the flow rate of the compressed air supplied to the timing chamber 7 is changed according to the pressure in the main chamber 13, so that the chamber The time until the pressure in 70 reaches the pressure of actuating the control valve 8 is not affected by the pressure in the main chamber 13, but becomes constant.

In the nailing machine 1B of the second embodiment, it is controlled so that the volume of the cavity 70 of the timing cavity 7B corresponds to the pressure in the main cavity 13 so that the pressure in the cavity 70 reaches the actuation control valve The time until the pressure of 8 is not affected by the pressure in the main cavity 13, but becomes constant.

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 controlled to correspond to the pressure in the main chamber 13 and the time until the control valve 8C moves to the actuated position. The system is not affected by the pressure in the main cavity 13, but becomes constant.

In the nailing machine 1D of the fourth embodiment, the force of the spring 82D that pushes the piston 81D of the control valve 8D is changed in accordance with the pressure in the main chamber 13, and the control valve 8D is moved to the actuated position. The time is not affected by the pressure in the main cavity 13, but becomes constant.

Moreover, the load when the piston 81 of the control valve 8 and the control valve rod 84 move are also changed due to temperature. For example, when the hardness of the O-ring changes due to the temperature, the sliding resistance changes.

Here, in the nailing machine 1E of the fifth embodiment, it is controlled so that the flow rate of the compressed air supplied to the timing chamber 7 changes according to the temperature, and the time until the control valve 8 moves to the actuating position is not Affected by temperature, it becomes constant.

<The structure example of the nailing machine in the first embodiment> 8A and 8B are sectional views showing an example of the nailing machine of the first embodiment. In addition, in the nailing machine 1A of the first embodiment, the same configuration as that of the nailing machine 1 described with reference to FIG. 1 and the like is given the same reference numerals, and detailed descriptions thereof are omitted.

The nailing machine 1A includes a flow control valve 9A that controls the flow of compressed air supplied to the timing chamber 7 through an on-off valve 6A. The flow control valve 9A is an example of a flow control mechanism, which is provided in the grip 12 The inner main cavity 13 includes: a pressure cylinder 90; a flow control valve stem 91 that reciprocates in the pressure cylinder 90; and a spring 92 that pushes the flow control valve stem 91.

The flow control valve 9A includes: a first orifice 90a and a second orifice 90b that communicate with the passage 63 of the on-off valve 6A; and a passage 90c that communicates with the main chamber 13. In addition, the flow control valve stem 91 includes an O-ring 91a for opening and closing the second orifice 90b.

The flow control valve 9A is the compressed air in the main chamber 13 and is supplied to the pressure cylinder 90 through the passage 90c, corresponding to the pressure in the main chamber 13, and the flow control valve rod 91 is actuated. The flow control valve rod 91 is moved to the first position shown in FIG. 8A by the spring 92 when the pressure in the main cavity 13 is the first pressure. In contrast, 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 greater than the first pressure.

In the state after the flow control valve rod 91 is moved to the first position, the first orifice 90a is opened, and at the same time, the second orifice 90b is opened by the O-ring 91a. Thereby, the passage 63 of the on-off valve 6A penetrates the first orifice 90a and the second orifice 90b to communicate with the main chamber 13.

When the flow control valve rod 91 is moved to the second position, the first orifice 90a is opened, and the O-ring 91a is used to close the second orifice 90b. Thereby, the passage 63 of the on-off valve 6A penetrates the first orifice 90a to communicate with the main chamber 13.

When the on-off valve 6A is moved to the actuating position shown in FIG. 3B and the like, the passage 63 is opened. Thereby, in the state after the flow control valve rod 91 is moved to the first position, the main chamber 13 passes through the first orifice 90a and the second orifice 90b and the passage 63 to communicate with the timing chamber 7 . In addition, in the state after the flow control valve rod 91 is moved to the second position, the main chamber 13 communicates with the timing chamber 7 through the first orifice 90a and the passage 63.

Therefore, when the pressure in the main chamber 13 is a second pressure greater than the first pressure, the flow rate of the compressed air supplied to the chamber 70 of the timing chamber 7 is the pressure in the main chamber 13, It is even less than the first pressure situation. Therefore, it can be controlled so that the flow rate of the compressed air supplied to the timing chamber 7 is changed in accordance with the pressure in the main chamber 13. The time until the pressure in the chamber 70 reaches the pressure of the actuation control valve 8 is not Affected by the pressure in the main cavity 13, it becomes constant. Thereby, when the contact tapping is performed, the time for the continuous tapping action can be made constant.

<The structure example of the nailing machine in the second embodiment> 9A and 9B are sectional views showing an example of the nailing machine of the second embodiment. In addition, in the nailing machine 1B of the second embodiment, the same reference numerals are assigned to the same structures as those of the nailing machine 1 described in FIG. 1 and the like, and detailed descriptions thereof are omitted.

The nailing machine 1B is attached to the timing chamber 7B, and includes an auxiliary chamber 73 and an auxiliary chamber opening and closing valve 74 as an adjustment mechanism. The sub-chamber opening and closing valve 74 includes: a pressure cylinder 75; a sub-chamber opening and closing valve stem 76 that reciprocates in the pressure cylinder 75; and a spring 77 that pushes the sub-chamber opening and closing valve stem 76.

The timing chamber 7B includes a passage 73a connecting the chamber 70 and the auxiliary chamber 73. In addition, the pressure cylinder 75 includes a passage 75 a communicating with the main chamber 13. Furthermore, the sub-chamber opening and closing valve stem 76 is an O-ring 76a including an opening and closing passage 73a.

The timing chamber 7B is the compressed air in the main chamber 13, and is supplied to the pressure cylinder 75 through the passage 75a, corresponding to the pressure in the main chamber 13, and the auxiliary chamber opening and closing valve stem 76 is actuated. The secondary cavity opening and closing valve rod 76 is moved to the first position shown in FIG. 9A by the spring 77 when the pressure in the main cavity 13 is the first pressure. In contrast, the secondary cavity opening and closing valve rod 76 moves to the second position shown in FIG. 9B when the pressure in the main cavity 13 is a second pressure greater than the first pressure.

In the state after the secondary chamber opening/closing valve rod 76 is moved to the first position, the passage 73a is closed by the O-ring 76a. Thereby, the cavity 70 and the auxiliary cavity 73 are not connected. In the state after the sub-chamber opening/closing valve rod 76 is moved to the second position, the passage 73a is opened by the O-ring 76a. Thereby, the cavity 70 and the auxiliary cavity 73 are connected.

When the on-off valve 6 is moved to the actuating position shown in FIG. 3B etc., the passage 63 is opened, and the main chamber 13 penetrates the passage 63 to communicate with the cavity 70 of the timing chamber 7B.

In the state after the secondary cavity opening/closing valve rod 76 is moved to the first position, the compressed air flows from the main cavity 13 only into the cavity 70, and the pressure in the cavity 70 starts to rise. After the secondary cavity opening and closing valve rod 76 is moved to the second position, the compressed air flows from the main cavity 13 through the cavity 70 and the cavity 70 to the secondary cavity 73, the cavity 70 and the secondary cavity The pressure system began to rise.

Therefore, when the pressure in the main chamber 13 is a second pressure greater than the first pressure, the volume of the timing chamber 7B becomes the size of the chamber 70 plus the auxiliary chamber 73, and the main chamber 13 The pressure is higher than the first pressure. Therefore, it can be controlled so that the volume of the timing chamber 7B is changed according to the pressure in the main chamber 13, and the time until the pressure in the timing chamber 7B reaches the pressure of the control valve 8 is not affected by the main chamber 13 Affected by the internal pressure, it becomes certain. Thereby, when the contact tapping is performed, the time for the continuous tapping action can be made constant.

<Example of the structure of the nailing machine in the third embodiment> 10A and 10B show cross-sectional views of an example of the nailing machine according to the third embodiment. In addition, in the nailing machine 1C of the third embodiment, the same reference numerals are assigned to the same structure as the nailing machine 1 described in FIG. 1 and the like, and detailed descriptions thereof are omitted.

The nailing machine 1C is connected to the control valve 8C, including: a pressure cylinder 88C, which serves as an adjustment mechanism; a secondary piston 89C, which is connected to the piston 81 and reciprocates in the pressure cylinder 88C; and a spring 89Ca, which pushes the secondary piston 89C to the piston 81 The direction. The sub-piston 89C is an example of the sub-actuating member, which is provided coaxially with the piston 81 and controls the standby position of the piston 81.

The pressure cylinder 88C includes a passage 88Ca communicating with the main cavity 13. The pressure cylinder 88C is compressed air flowing in from the passage 88Ca to press the secondary piston 89C to a position away from the control valve stem 84, and a passage 88Ca is provided.

The control valve 8C is the compressed air in the main chamber 13 and is supplied to the pressure cylinder 88C through the passage 88Ca, and the auxiliary piston 89C acts in response to the pressure in the main chamber 13. The secondary piston 89C is moved to the first position shown in FIG. 10A by the spring 89Ca when the pressure in the main cavity 13 is the first pressure. In contrast, the secondary piston 89C moves to the second position shown in FIG. 10B when the pressure in the main chamber 13 is a second pressure greater than the first pressure.

In the state after the secondary piston 89C has moved to the first position, the standby position of the piston 81 is close to the control valve rod 84. As a result, the stroke of the control valve rod 84 moved to the standby position and the piston 81 moved to the actuated position is shortened. In the state after the secondary piston 89C has moved to the second position, the standby position of the piston 81 is away from the control valve rod 84. Thereby, the stroke of the control valve rod 84 moved to the standby position and the piston 81 moved to the actuated position becomes longer.

Therefore, when the pressure in the main cavity 13 is at a second pressure greater than the first pressure, the stroke of the piston 81 becomes longer. Therefore, the stroke of the piston 81 can be controlled to change according to the pressure in the main cavity 13, and the time until the control valve rod 84 reaches the actuating position is not affected by the pressure in the main cavity 13, but becomes constant. Thereby, when the contact tapping is performed, the time for the continuous tapping action can be made constant.

<The structure example of the nailing machine of the fourth embodiment> 11A and 11B are sectional views showing an example of the nailing machine according to the fourth embodiment. In addition, in the nailing machine 1D of the fourth embodiment, the same configuration as that of the nailing machine 1 described in FIG. 1 and the like is given the same reference numerals, and detailed descriptions thereof are omitted.

The nailing machine 1D is connected to the control valve 8D, and as an adjustment mechanism, it includes: a pressure cylinder 88D; and a spring load control piston 89D, which reciprocates in the pressure cylinder 88D. The spring load control piston 89D is an example of a load control member. It is arranged coaxially with the piston 81 and controls the length of the spring 82 that pushes the piston 81 in the expansion and contraction direction.

The pressure cylinder 88D includes a passage 88Da communicating with the main cavity 13. The pressure cylinder 88D is at a position where the compressed air flowing in from the passage 88Da presses the spring load control piston 89D in the direction of the compression spring 82, and a passage 88Da is provided.

The control valve 8D is the compressed air in the main cavity 13 and is supplied to the pressure cylinder 88D through the passage 88Da, corresponding to the pressure in the main cavity 13, and the spring load controls the actuation of the piston 89D. The spring load control piston 89D is moved to the first position shown in FIG. 11A by the spring 82 when the pressure in the main cavity 13 is the first pressure. In contrast, the spring load control piston 89D moves to the second position shown in FIG. 11B when the pressure in the main cavity 13 is a second pressure greater than the first pressure.

In the state after the spring load control piston 89D has moved to the first position, the spring load control piston 89D is separated from the piston 81. Thereby, the load of the spring 82 hung on the piston 81 in the standby position becomes weak. In the state after the spring load control piston 89D has moved to the second position, the spring load control piston 89D approaches the piston 81. Thereby, the load of the spring 82 hung on the piston 81 in the standby position becomes stronger.

Therefore, when the pressure in the main chamber 13 is a second pressure greater than the first pressure, the load of the spring 82 hung on the piston 81 in the standby position becomes stronger. Therefore, it can be controlled so that the load of the spring 82 hung on the piston 81 in the standby position can be changed according to the pressure in the main cavity 13, and the time until the control valve rod 84 reaches the actuating position is not affected by the main cavity 13 Affected by the size of the pressure, it becomes certain. Thereby, when the contact tapping is performed, the time for the continuous tapping action can be made constant.

<The structure example of the nailing machine in the fifth embodiment> 12A and 12B are sectional views showing an example of the nailing machine of the fifth embodiment. In addition, in the nailing machine 1E of the fifth embodiment, the same reference numerals are assigned to the same structures as those of the nailing machine 1 described in FIG. 1 and the like, and detailed descriptions thereof are omitted.

The nailing machine 1E includes a flow control member 93 that controls the flow of compressed air supplied to the timing chamber 7 through the on-off valve 6E. The flow control member 93 is an example of an adjustment mechanism. The thermal expansion coefficient is different from the on-off valve. The passage 63 of 6E is connected by the material of the passage 63b. The passage 63b is made of metal (aluminum). Furthermore, the passage 63b may also be made of the same material as the main body 10 and the gripping portion 12. In addition, the flow control member 93 is made of resin.

The flow control member 93 is installed inside the passage 63b, and a gap S5 through which air passes is formed between the outer circumference of the flow control member 93 and the inner circumference of the passage 63b. The flow control member 93 functions as an orifice for restricting the flow in the passage 63b. In addition, the expansion and contraction rates of the passage 63b and the flow control member 93 caused by the temperature change are different. Therefore, the size of the gap S5 between the outer circumference of the flow control member 93 and the inner circumference of the passage 63b changes due to temperature.

Therefore, the size of the gap S5 between the outer circumference of the flow control member 93 and the inner circumference of the passage 63b is increased, so that the temperature at which the sliding resistance of the piston 81 of the control valve 8 and the control valve stem 84 increases is supplied to the cavity of the timing chamber 7 The flow rate of the compressed air in the body 70 increases. In addition, the size of the gap S5 between the outer circumference of the flow control member 93 and the inner circumference of the passage 63b is reduced, so that at the temperature at which the sliding resistance of the piston 81 of the control valve 8 and the control valve stem 84 is reduced, it is supplied to the cavity of the timing chamber 7 The flow rate of the compressed air in the body 70 decreases. In this example, the structure is a combination of materials that expand the gap S5 between the passage 63b and the flow control member 93 as the temperature decreases.

Therefore, it can be controlled so that the flow rate of the compressed air supplied to the timing chamber 7 changes according to the temperature, and the time until the control valve stem 84 reaches the actuating position is not affected by the temperature, but becomes constant. Thereby, when the contact tapping is performed, the time for the continuous tapping action can be made constant.

Furthermore, in each of the above-mentioned embodiments, although the structure in which the control valve 8 is arranged between the overhead valve 3 and the trigger valve 5 has been described, the control valve 8 may be provided in other places to control the supply to the head valve The compressed air in the upper chamber 34 is discharged. For example, the control valve may not be provided on the upstream side of the trigger valve, but on the downstream side, and the trigger valve may be arranged between the head valve and the control valve to form a self-head valve upper chamber through the trigger valve and communicate with the control valve The passage is opened and closed by the control valve to switch the compressed air discharged from the upper chamber of the head valve to the atmosphere.

In the pneumatic tool in this disclosure, the actuation timing and amount of the control valve are switched in accordance with the fluctuation factors of the compressed air supplied to the cavity, such as the air pressure and temperature, and the timing of whether the controlled object is actuated or not is switched. Corresponding to the change factor to be controlled. In the pneumatic tools of this disclosure, it is possible to not be affected by variable factors such as the air pressure of the compressed air and the temperature. The timing of switching whether the controlled object is activated or not is fixed.

This application is based on the Japanese patent application 2019-086668 filed on April 26, 2019, the content of which is incorporated herein as a reference.

1,1A,1B,1C,1D,1E: nailing machine (pneumatic tool) 10: body 11: Nose 11a: Injection hole 12: Grip 13: Main cavity 14: Return air cavity 14a: small hole 14b: Check valve 15: exhaust port 2: Knock the cylinder 20: Knock the piston 20a: O-ring 21: Knock the drive 22: Knock the piston stopper 22a: To exhaust port 22b: recess 3: Head valve (controlled object) 30: Head valve pressure cylinder 31: Head valve piston 31a: Exhaust opening and closing part 32: Head valve piston stopper 33: Spring 34: Head valve upper chamber 35: Head valve seal 4: trigger link 40: contact arm 40a: pressing member 40b: Compression spring 41: axis 42: Dalian Rod 43: axis 44: small connecting rod 5: Trigger valve 50: Access 51: Shell 52: Pilot valve 52a, 52b, 52c: O-ring 52d: access 53: Lid 53a: empty room 54: trigger valve stem 54a, 54b: O-ring 55: spring 56: Access S1, S2, S3: clearance 6: On-off valve 60: Cylinder 61: switch stem 61a, 61b: O-ring 62: Spring 63, 63b, 64: access 63a: Orifice 64a: access 65: Access 7: Timing chamber 70: Cavity 70a: Take the entrance 70b: Take the exit 70c: exhaust port 70d: access 71: Reset valve 71a: Cylinder 71b: Piston 71c: O-ring 72: spring 73: auxiliary cavity (adjustment mechanism) 73a: access 74: Secondary cavity opening and closing valve (adjustment mechanism) 75: Cylinder 75a: access 76: Secondary cavity opening and closing valve stem 76a: O-ring 77: Spring 8: Control valve 80: Cylinder 81: Piston (acting member) 82: Spring 83: Cylinder 84: control stem 84a, 84b: O-ring 85: spring 86, 87: access 88C: Cylinder 88Ca: access 89C: Vice piston (auxiliary actuating member) 89Ca: Spring 88D: Cylinder 88Da: access 89D: Spring load control piston (load control member) 9A: Flow control valve (flow control mechanism) 90: Cylinder 90a: No. 1 orifice 90b: 2nd orifice 90c: access 91: Flow control valve stem 91a: O-ring 92: spring 93: Flow control component (adjustment mechanism)

[Figure 1] is a side sectional view showing an example of the nailing machine. [Figure 2A] is a cross-sectional view showing an example of the head valve. [Figure 2B] is a cross-sectional view showing an example of the head valve. [Figure 3A] is a cross-sectional view showing an example of a trigger valve and an on-off valve. [Figure 3B] is a cross-sectional view showing an example of a trigger valve and an on-off valve. [Figure 3C] is a cross-sectional view showing an example of a trigger valve and an on-off valve. [Figure 3D] is a cross-sectional view showing an example of a trigger valve and an on-off valve. [Fig. 4A] is a cross-sectional view showing an example of the timing chamber. [Fig. 4B] is a cross-sectional view showing an example of a timing chamber. [Figure 5A] is a cross-sectional view showing an example of a control valve. [Figure 5B] is a cross-sectional view showing an example of a control valve. [Figure 6A] is a cross-sectional view showing an example of the action of the nailing machine. [Figure 6B] is a cross-sectional view showing an example of the action of the nailing machine. [Figure 6C] is a cross-sectional view showing an example of the action of the nailing machine. [Figure 6D] is a cross-sectional view showing an example of the action of the nailing machine. [Figure 7A] is a cross-sectional view showing an example of the action of the nailing machine after the control valve is actuated. [Figure 7B] is a cross-sectional view showing an example of the action of the nailing machine after the control valve is actuated. [Fig. 8A] is a cross-sectional view showing an example of the nailing machine of the first embodiment. [Fig. 8B] is a cross-sectional view showing an example of the nailing machine of the first embodiment. [Fig. 9A] is a cross-sectional view showing an example of the nailing machine of the second embodiment. [Fig. 9B] is a cross-sectional view showing an example of the nailing machine of the second embodiment. [Fig. 10A] is a cross-sectional view showing an example of the nailing machine of the third embodiment. [Fig. 10B] is a cross-sectional view showing an example of the nailing machine of the third embodiment. [Fig. 11A] is a cross-sectional view showing an example of the nailing machine of the fourth embodiment. [Fig. 11B] is a cross-sectional view showing an example of the nailing machine of the fourth embodiment. [Fig. 12A] is a cross-sectional view showing an example of the nailing machine of the fifth embodiment. [Fig. 12B] is a cross-sectional view showing an example of the nailing machine of the fifth embodiment.

1A: Nailer (pneumatic tool)

3: Head valve (controlled object)

4: trigger link

5: Trigger valve

6A: On-off valve

7: Timing chamber

8: Control valve

9A: Flow control valve (flow control mechanism)

10: body

11: Nose

11a: Injection hole

13: Main cavity

14: Return air cavity

14a: small hole

14b: Check valve

15: exhaust port

20: Knock the piston

20a: O-ring

21: Knock the drive

22a: To exhaust port

22b: recess

30: Head valve pressure cylinder

31: Head valve piston

31a: Exhaust opening and closing part

32: Head valve piston stopper

33: Spring

34: Head valve upper chamber

40: contact arm

40a: pressing member

40b: Compression spring

41: axis

42: Dalian Rod

43: axis

44: small connecting rod

50: Access

52: Pilot valve

53a: empty room

54: trigger valve stem

56: Access

61: switch stem

63: Access

64: Access

70: Cavity

70a: Take the entrance

70b: Take the exit

70c: exhaust port

71: Reset valve

71b: Piston

72: spring

81: Piston (actuating member)

84: control stem

86: Access

90: Cylinder

90a: No. 1 orifice

90b: 2nd orifice

90c: access

91: Flow control valve stem

91a: O-ring

92: spring

S1: gap

Claims (13)

A pneumatic tool, which includes: The cavity has a predetermined volume supplied with compressed air; The control valve is connected to the cavity to switch whether the controlled object is activated or not; and Adjust the mechanism to switch the actuation of the control valve. Such as the pneumatic tool of claim 1, wherein the control valve includes an actuating member that is actuated by air pressure in the cavity, The adjustment mechanism switches the action of the actuating member corresponding to the air pressure of the compressed air supplied to the cavity. The pneumatic tool of claim 1, wherein the adjustment mechanism includes a flow control mechanism corresponding to the air pressure of the compressed air supplied to the cavity to control the flow of the compressed air supplied to the cavity. Such as the pneumatic tool of claim 1, wherein the adjustment mechanism corresponds to the air pressure of the compressed air supplied to the cavity to increase or decrease the volume of the cavity. Such as the pneumatic tool of claim 4, where the adjustment mechanism includes: The auxiliary cavity is connected with the cavity; A passage connecting the cavity and the auxiliary cavity; and The auxiliary cavity opening and closing valve corresponds to the air pressure of the compressed air supplied to the cavity to open and close the passage. Such as the pneumatic tool of claim 2, wherein the adjustment mechanism includes an auxiliary actuating member corresponding to the air pressure of the compressed air supplied to the cavity to control the actuation amount of the actuating member of the control valve. The pneumatic tool of claim 2, wherein the adjusting mechanism includes a load control member corresponding to the air pressure of the compressed air supplied to the cavity to control the load of the actuating member of the control valve. Such as the pneumatic tool of claim 1, wherein the adjustment mechanism corresponds to the temperature to switch the operation of the control valve. Such as the pneumatic tool of claim 8, wherein the adjustment mechanism includes: A passage through which compressed air passes; and The flow control member is made of a material different from the thermal expansion coefficient of the passage. The pneumatic tool of claim 9, wherein the passage and the flow control member are composed of a combination of materials in which the gap between the passage and the flow control member expands as the temperature decreases. The pneumatic tool of claim 9, wherein the passage and the flow control member constitute an orifice that restricts the flow of compressed air passing through the passage. Such as the pneumatic tools of any one of claim 1 to claim 11, which include: The knocking piston is connected with the knocking driver that knocks out the nail body supplied into the nose; When the cylinder is knocked, the knocking piston moves back and forth; The head valve communicates and blocks the main cavity supplied with compressed air and the percussion cylinder; The trigger connecting rod bears the operation of actuating the head valve; The contact arm can reciprocate in the axial direction of the nose; Trigger the valve to actuate the head valve by the action of the trigger link and the contact arm; and The on-off valve, by the action of the trigger link, supplies compressed air from the main cavity to the cavity, The control valve switches the opening and closing of the passage connecting the trigger valve and the head valve. Such as the pneumatic tools of any one of claim 1 to claim 11, which include: The knocking piston is connected with the knocking driver that knocks out the nail body supplied into the nose; When the cylinder is knocked, the knocking piston moves back and forth; The head valve communicates and blocks the main cavity supplied with compressed air and the percussion cylinder; The trigger connecting rod bears the operation of actuating the head valve; The contact arm can move back and forth in the axial direction of the nose; Trigger the valve to actuate the head valve by the action of the trigger link and the contact arm; and The on-off valve, by the action of the trigger link, supplies compressed air from the main cavity to the cavity, The control valve switches the opening and closing of the passage of the upper chamber of the head valve for storing the compressed air that actuates the head valve and discharges the compressed air to the atmosphere.

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