JP2015039763A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving machine capable of preventing driving failure occurring when a supply pressure becomes lower than a predetermined pressure.SOLUTION: A driving machine 1 includes: a pressure accumulation chamber 400 which accumulates compressed-air; a cylinder 110 where a piston 120, which drives a fastener 2 by using the compressed-air supplied from the pressure accumulation chamber 400, is housed; a main valve which selectively allows the pressure accumulation chamber 400 and the cylinder 110 to communicate and blocks the communication; and a trigger valve which controls the main valve. The driving machine 1 is provided with a control valve 600 which limits the operation of the main valve even if the trigger valve is in an open state when a pressure of the compressed-air in the pressure accumulation chamber 400 is lower than a predetermined pressure.

Description

  The present invention relates to a driving machine, and more particularly to a driving machine for driving a stopper such as a nail or a staple.

  As a driving machine, for example, a driving machine such as a nail driver using compressed air as a power source is known (see, for example, Patent Document 1).

  Such a driving machine is connected to a compressed air supply source such as a compressor via an air hose. The compressed air supplied from the compressor is used after being adjusted within a predetermined pressure range of the main body of the driving machine according to the use and the material of the driven material into which the stopper is driven. In this case, the pressure is generally adjusted on the compressor side or with a pressure regulator or the like installed at the air intake of the driving machine.

  In addition, there is a driving machine provided with a relief valve that discharges compressed air to the outside and decompresses the inside of the main body in preparation for unexpectedly supplying compressed air of a predetermined pressure or higher.

JP 2012-139779 A

  In a conventional driving machine, when the supply pressure and the pressure inside the main body exceed a predetermined pressure, the load on the driving machine main body increases, so the structure is such that the pressure is released to the atmosphere and reduced to a predetermined pressure range. Proposed.

  However, the conventional driving machine has a problem that, even when the supply pressure is less than the predetermined pressure, driving defects such as nail lifting occur due to insufficient driving energy. When the driving failure occurs, extra work such as re-nailing of the nail occurs. Therefore, when the pressure is lower than the predetermined pressure, it is desirable to adjust the work within the predetermined pressure range without performing the driving operation.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a driving machine capable of preventing a driving failure that occurs when a supply pressure becomes less than a predetermined pressure.

  The present invention provides a pressure accumulating chamber for storing compressed air, a cylinder housing a piston for driving a stopper with compressed air supplied from the pressure accumulating chamber, and the pressure accumulating chamber and the inside of the cylinder are selectively communicated and blocked. A driving machine comprising a main valve and a trigger valve that controls the main valve, wherein the trigger valve is open when the pressure of the compressed air in the pressure accumulating chamber is less than a predetermined pressure. A control valve for limiting the operation of the main valve is provided.

  The main valve chamber communicates with the trigger valve and operates the main valve when pressure fluctuation occurs according to the operation of the trigger valve. The control valve has a pressure in the pressure accumulating chamber lower than a predetermined pressure. Is lower, it is preferable to suppress the pressure change in the main valve chamber even if the trigger valve operates.

  The control valve is slidable between a valve bush having a vent hole communicating the accumulator chamber and the trigger valve, a first position for opening the vent hole, and a second position for closing the vent hole. A valve sleeve, and a spring for holding the valve sleeve in the second position. When the pressure of the compressed air supplied from the pressure accumulating chamber becomes equal to or higher than the predetermined pressure, the valve sleeve It is preferable to displace from the second position to the first position against an urging force.

  Preferably, the vent hole is formed on an outer peripheral surface of the valve bush, and the valve sleeve is slidably provided on the outer peripheral surface of the valve bush.

  It is preferable to have an opening valve for opening the compressed air remaining in the valve bush into the pressure accumulating chamber when the compressed air in the pressure accumulating chamber is opened to the atmosphere.

  The valve for control has a vent hole communicating with the pressure accumulating chamber and the trigger valve, and the valve sleeve is provided slidably on the outer peripheral surface of the valve bush and opens and closes the vent hole; And a spring for urging the valve sleeve against the pressure of the compressed air supplied from the pressure accumulating chamber in a direction to close the vent hole.

  It is preferable that the control valve is a sleeve valve provided in an air passage formed in the main body.

  ADVANTAGE OF THE INVENTION According to this invention, the driving device which can prevent the driving failure which generate | occur | produces when supply pressure becomes less than predetermined pressure can be provided.

It is a partial cross section side view which shows the driving machine which is 1st Embodiment of this invention. It is an expanded sectional view of the A section of Drawing 1, and is a principal part expanded sectional view showing a case where the pressure of compressed air in a pressure accumulation room is lower than a predetermined pressure. It is an expanded sectional view of the A section of Drawing 1, and is a principal part expanded sectional view showing a case where the pressure of compressed air in a pressure accumulation room is higher than a predetermined pressure. It is sectional drawing which shows the state which nailed the nail. It is a partial cross section side view which shows the state before nailing of the conventional driving machine as a comparative example with the driving machine of this Embodiment. It is a partial cross section side view which shows the state after nail driving | running | working of the conventional driving machine as a comparative example with the driving machine of this Embodiment. It is a partial cross section side view which shows the driving machine which is 2nd Embodiment of this invention. It is a principal part expanded sectional view which shows the modification of the driving device which changed arrangement | positioning of a control valve. It is a principal part expanded sectional view which shows the state at the time of valve closing of the control valve. It is a partial cross section side view which shows the driving machine which is 3rd Embodiment of this invention. It is a principal part expanded sectional view which shows the valve opening state of the control valve in the driving device. It is a principal part expanded sectional view which shows the valve closing state of the control valve in the driving device.

  Hereinafter, a nailing machine which is a driving machine according to an embodiment of the present invention will be described with reference to the drawings. A nailing machine 1 according to the first embodiment shown in FIGS. 1 to 4 is a tool for driving a nail 2 as a stopper, and compressed air is used as its power.

  The nailing machine 1 is integrally provided with a main body (housing) 100 extending in the vertical direction, a handle portion 200 extending in a direction substantially orthogonal to the vertical direction, and a nose portion 300 positioned at the lower end of the main body 100. ing. In order to accumulate compressed air supplied from a compressor (not shown), a pressure accumulating chamber 400 is formed in the handle portion 200 and the main body 100 of the nail driver 1.

  The pressure accumulating chamber 400 is connected at its connection port 401 to a compressor (not shown) via an air hose (not shown). A connection port 401 is provided at the rear end of the handle portion 200, and an air hose is connected to the connection port 401 when the nail driving operation is started. When the nail driving operation is finished, the air hose is removed from the connection port 401. As a result, the pressure accumulation chamber 400 is opened to the atmosphere.

  The main body 100 has a cylindrical shape which is long in the vertical direction and is provided so as to be movable in the vertical direction, and a piston 120 which is fitted in the cylinder 110 so as to be slidable (reciprocating) in the vertical direction. And a driver blade 130 formed integrally with the piston 120.

  The cylinder 110 slidably supports the piston 120 on its inner peripheral surface. A return air chamber 140 for storing compressed air for returning the driver blade 130 to the top dead center is formed on the outer periphery on the lower side of the cylinder 110. A first air passage 112 having a check valve 111 is provided in the central portion of the cylinder 110 in the axial direction. The check valve 111 allows compressed air to flow from the inside of the cylinder 110 to the return air chamber 140 outside the cylinder 110 only in one direction. Spills are allowed.

  A second air passage 113 that is always open to the return air chamber 140 is formed below the cylinder 110. A piston bumper 150 made of an elastic body such as rubber is provided at the lower end of the cylinder 110 in order to absorb surplus energy after nail driving due to the rapid downward movement of the piston 120. A through hole 151 through which the driver blade 130 is inserted is formed at the center of the piston bumper 150.

  The driver blade 130 is formed integrally and axially with the piston 120 so as to extend downward from the approximate center of the lower surface of the piston 120. The cylinder 110 is partitioned by a piston 120 into a piston upper chamber 110a and a piston lower chamber 110b. The piston upper chamber 110a is formed on the lower surface of the cylinder head portion 110h with which the upper end portion of the cylinder 110 abuts. The cylinder head part 110 h is provided in the main body 100.

  When the compressed air flows into the piston upper chamber 110a when the nail 2 is driven, the driver blade 130 is rapidly lowered together with the piston 120 and slides in the injection passage 311 to apply a driving force to the nail 2. It is like that.

  A cylinder head portion 110 h is located above the cylinder 110. When the cylinder 110 is located at the top dead center (first position), the upper end of the cylinder 110 and the lower surface of the cylinder head portion 110h come into contact with each other, and the piston upper chamber 110a and the pressure accumulating chamber 400 are shut off. When the cylinder 110 is located at the bottom dead center (second position), the upper end of the cylinder 110 is separated from the lower surface of the cylinder head portion 110h, and the piston upper chamber 110a and the pressure accumulating chamber 400 communicate with each other. The upper end of the cylinder 110 and the lower surface of the cylinder head portion 110h correspond to the “main valve” in the present embodiment. That is, the main valve selectively communicates and blocks the pressure accumulation chamber 400 and the inside of the cylinder 110. On the upper outer periphery of the cylinder 110, there are a main valve chamber 161, a first spring 162 that urges the cylinder 110 upward, a third air passage 163 that connects the piston upper chamber 110a and the atmosphere, and a third air passage 163. An exhaust valve 164 that opens and closes is provided.

  The handle part 200 is a part held by an operator. As shown in an enlarged view in FIG. 2, the connection portion of the handle portion 200 with the main body 100 communicates with a trigger 210 operated by an operator against the urging force of the second spring 212 and the pressure accumulating chamber 400. A trigger valve (second valve) 220 that is a switching valve for sending and discharging compressed air, a trigger plunger 230 for switching opening and closing of the trigger valve 220 by operating the trigger 210, and a main valve chamber 161 (see FIG. 1). A push lever valve 240 that is a switching valve that sends and discharges compressed air, a push lever plunger portion 250 that switches opening and closing of the push lever valve 240, a fourth air passage 260 that connects the trigger valve 220 and the push lever valve 240, The push lever valve 240, the main valve chamber 161 and the exhaust valve 164; And a fifth air passage 270 that connects (see Fig. 1).

  The trigger valve 220 includes a substantially spherical first valve member 221 and a first locking portion 222 that locks the first valve member 221. The first locking portion 222 forms a valve seat on which the first valve member 221 is seated. The 1st valve member 221 is accommodated in the trigger valve chamber 223 which connects the pressure accumulation chamber 400 and the 4th air passage 260 mentioned later. The first locking portion 222 is an edge portion of the first opening 224 that opens downward from the trigger valve chamber 223. The diameter of the first opening 224 is set smaller than the diameter of the first valve member 221.

  Therefore, when the first valve member 221 receives downward pressure due to the pressure of the compressed air in the pressure accumulating chamber 400, the first valve member 221 is seated on the first locking portion 222, and the first opening 224 is closed. The That is, the trigger valve 220 is closed. When the first valve member 221 is moved upward against the pressure of the compressed air in the pressure accumulating chamber 400 by the trigger plunger 230, the first valve member 221 is separated from the first locking portion 222, and the first opening is opened. Part 224 is opened. That is, the trigger valve 220 is opened.

  The trigger plunger 230 is provided below the first valve member 221 so as to be movable up and down. When the lower end portion of the trigger plunger 230 is pressed upward by the trigger 210, the first valve member 221 of the trigger valve 220 is pushed upward against the pressure of compressed air, and the trigger valve 220 is opened. Become.

  The push lever valve 240 is a valve that switches inflow of compressed air into the fifth air passage 270 by the push lever 320. The push lever valve 240 includes a bush 241 extending substantially in the vertical direction, a second valve member 242 in contact with the upper end of the bush 241, and a third valve urging the second valve member 242 in the valve closing direction (downward). And a spring 243.

  The bush 241 is formed in a tubular shape having a passage 241 a extending substantially in the vertical direction, and is fixed to the main body 100. The passage 241a guides when a plunger 251 described later slides in the vertical direction. A second locking portion 241 c that locks the second valve member 242 is formed at the open end 241 b formed at the upper end of the bush 241. The second locking portion 241c forms a valve seat on which the second valve member 242 is seated.

  The bush 241 is formed with a recess 241d into which the operation rod 254 of the push lever 320 and the ratchet spring 255 for urging the push lever valve 240 in the valve opening direction are fitted. Further, the bush 241 is formed with a second opening 241e that allows the fifth air passage 270 and the passage 241a to communicate with each other. An exhaust port 241f is formed on the push lever 320 side of the passage 241a.

  The second valve member 242 moves in the vertical direction, and opens or closes the open end 241 b at the upper end of the bush 241. In a state where the second valve member 242 is locked to the second locking portion 241c of the bush 241, the open end 241b is closed, and the push lever valve 240 is closed. Further, the second valve member 242 opens the open end 241b in a state where it is not locked to the second locking portion 241c, and the push lever valve 240 is opened. Further, the second valve member 242 is urged downward (in the valve closing direction) by the third spring 243.

  The push lever main body 321 is connected to the main body 100 via a push lever spring 322 as shown in FIG. When waiting for the driving operation, as shown in FIG. 1, the lower end portion of the push lever main body portion 321 protrudes from the lower end of the injection portion 310. Further, at the time of driving operation to the workpiece 3, the main body 100 is pressed toward the workpiece 3, so that the push lever body 321 receives a drag from the workpiece 3, The push lever spring 322 moves upward relative to the main body 100 and the handle portion 200 against the urging force of the push lever spring 322.

  The nailer 1 is provided with a control valve (third valve) 600 that disables the operation of the push lever valve 240 when the pressure of the compressed air in the pressure accumulating chamber 400 is less than a predetermined pressure. As shown in FIG. 2, the control valve 600 is provided with a control valve chamber 601 disposed above the trigger valve 220, and standing upright in the control valve chamber 601. The upper end is closed and the lower end has an outward flange. A cylindrical valve bushing 602 that is long in the vertical direction, a valve sleeve 603 that is slidable in the longitudinal direction on the outer peripheral surface of the valve bushing 602, and biases the valve sleeve 603 downward. The fourth spring 604 is mainly configured.

  The control valve chamber 601 communicates with the pressure accumulating chamber 400 through the side fourth opening 601a, and communicates with the atmosphere through the upper fifth opening 601b. The valve bush 602 is provided with a vent hole 602a that communicates between the inner peripheral surface and the outer peripheral surface thereof.

  The valve sleeve 603 is slidably disposed on the outer peripheral surface of the valve bush 602, includes a seal member 603a on the inner peripheral surface, and seals the lower outer peripheral surface including the vent hole 602a in the initial state.

  In the initial state, the load (biasing force) of the fourth spring 604 is set to be equal to the load generated when the lower limit pressure in the predetermined pressure range is applied to the end surface 603b of the valve sleeve 603. Therefore, when the pressure of the compressed air in the pressure accumulating chamber 400 becomes less than a predetermined pressure, the valve sleeve 603 is pushed downward by the urging force of the fourth spring 604, closes the vent hole 602a, and the compressed air remaining in the pressure accumulating chamber is The supply to the push lever valve 240 side can be prevented.

  Next, the operation of the nailing machine 1 configured as described above will be described. First, an operation when compressed air within a predetermined pressure range is supplied to the nailing machine 1 will be described.

  When compressed air within a predetermined pressure range is supplied to the pressure accumulating chamber 400, the compressed air flows from the fourth opening 601a of the control valve chamber 601 and the pressure applied to the end surface 603b of the valve sleeve 603 as shown in FIG. As a result, the valve sleeve 603 moves upward. At this time, since the seal position of the seal member 603a of the valve sleeve 603 moves upward from below the vent hole 602a, the accumulator chamber 400 and the trigger valve chamber 223 communicate with each other through the vent hole 602a as usual. Become.

  In this state, when the driving operation, that is, the pushing operation of the push lever 320 and the pulling operation of the trigger 210 are both performed, and the trigger valve 220 and the push lever valve 240 are released, as shown in FIG. The compressed air flows into the main valve chamber 161, the cylinder 110 is moved downward, and the compressed air is introduced into the cylinder 110 from the upper end of the cylinder 110, so that the nail 2 can be driven.

  When the air hose is removed after the driving machine is used and the compressed air in the pressure accumulating chamber 400 is discharged, the compressed air remaining in the valve bushing 602 is released from the release valve 602c and the fourth valve 602c provided in the sixth opening 602b. It passes through the opening 601a and the pressure accumulating chamber 400 and is discharged to the outside.

  Next, an operation when compressed air having a pressure less than a predetermined pressure is supplied to the nailing machine according to the present embodiment will be described.

  When compressed air having a pressure lower than a predetermined pressure is supplied to the pressure accumulating chamber 400, the compressed air flows from the fourth opening 601a of the control valve chamber 601, and pressure is applied to the end surface 603b of the valve sleeve 603 to move it upward. However, since the load of the fourth spring 604 that biases the valve sleeve 603 downward is larger, the valve sleeve 603 does not move. At this time, the vent hole 602a is shielded by the seal member 603a of the valve sleeve 603, and the communication between the pressure accumulating chamber 400 and the trigger valve 220 is blocked.

  In this state, even if the driving operation, that is, the pushing operation of the push lever 320 and the pulling operation of the trigger 210 are both performed and the trigger valve 220 and the push lever valve 240 are released, the compressed air in the pressure accumulating chamber 400 is controlled. The main valve is not actuated and the nail 2 cannot be driven because it is blocked by the valve 600 and does not flow into the main valve chamber 161. That is, when the pressure in the pressure accumulating chamber 400 is lower than a predetermined pressure, even if the trigger valve 220 is operated, the control valve 600 suppresses the pressure change in the main valve chamber 161 and is not driven. Therefore, when the supply pressure is less than the predetermined pressure, the nail 2 can not be driven, so that it is possible to prevent nail floating and deterioration of the driving finish.

  Further, the control valve 600 is provided with a valve bush 602 having a vent hole 602a communicating with the pressure accumulating chamber 400 and the trigger valve 220, and a valve sleeve slidably provided on the outer peripheral surface of the valve bush to open and close the vent hole 602a. 603 and a spring that urges the valve sleeve 603 in a direction to close the vent hole against the pressure of the compressed air supplied from the pressure accumulating chamber 400, and therefore between the pressure accumulating chamber 400 and the trigger valve 220. The control valve 600 can be incorporated in a compact manner, and the nailing machine 1 can be made compact.

  Further, the valve bush 602 has an open valve 602c for releasing the compressed air remaining in the valve bush 602 into the pressure accumulating chamber 400 when the compressed air in the pressure accumulating chamber 400 is released to the atmosphere. After use, the compressed air remaining in the valve bushing 602 can be released to the atmosphere from the connection port 401 via the pressure accumulating chamber 400, and when a failure such as the trigger 210 is pulled due to the compressed air remaining in the valve bushing 602. It is possible to eliminate the occurrence of abnormal noise from the air.

  5 and 6 are diagrams showing a conventional driving machine as a comparative example with the driving machine according to the present embodiment. FIG. 5 shows a state before driving and FIG. 6 shows a state after driving. . In the driving machine shown in FIG. 5, when the pressure of the supplied compressed air is within a predetermined range, the driving operation is normally performed, but when the pressure of the compressed air is low, the force of driving the nail May become insufficient and nail lift may occur as described in FIG. 5 and 6, the same parts as those of the embodiment of FIG. 1 are denoted by the same reference numerals.

  7-9 is a figure which shows 2nd Embodiment of the driving machine 1. FIG. In the driving machine 1, the control valve 600 is provided not at the vicinity of the second valve 220 but at the top of the main body 100 away from the second valve 220. In this case, the fifth air passage 270 extends to the top of the main body 100, and a control valve chamber 601 is formed at the top of the main body 100. The top of the main body 100 is provided with a fifth opening 601b that is open to the atmosphere.

  The control valve 600 is a cylindrical part 612 formed at the front end of the fifth air passage 270 and closed at the front end. The control valve 600 is formed on the outer periphery of the cylindrical part 612 and is connected to the fifth air passage 270 and the control valve. A hole 612a that communicates with the chamber 611, a sleeve valve 613 that is slidably mounted in the axial direction on the outer periphery of the cylindrical portion 612, and opens and closes the hole 612a, and the hole 612a opens the sleeve valve 613. It is mainly composed of a spring 614 that is biased in the direction to be moved. When the control valve 600 is at a low pressure (below the specification pressure range), the fifth air passage 270 communicates with the atmosphere through the hole 612a as shown in FIG. The pressure does not increase, and the push lever valve 240 is not activated. That is, also in the second embodiment, when the pressure in the pressure accumulating chamber 400 is lower than a predetermined pressure, the control valve 600 is driven in to suppress the pressure change in the main valve chamber 161 even if the trigger valve 220 is operated. Is not done. Within the specified pressure range, as shown in FIG. 9, the spring 614 is compressed via the sleeve valve 613 by the pressure of the compressed air, and the sleeve valve 613 is held in the closed position, so that the compressed air passes through the hole 612a. Thus, the push lever valve 240 can be activated without flowing out to the atmosphere from the fifth opening 601b.

  10 to 12 are views showing a third embodiment of the driving machine 1. As shown in FIGS. 10 to 12, in the driving machine 1, the trigger valve 220 is a single valve, and is provided in the fifth air passage 270 between the head valve chamber 605 and the trigger valve 220 corresponding to the main valve chamber. A control valve 600 is provided. The head valve chamber 605 is provided with a head valve 606 that is detachably brought into contact with the upper end of the cylinder 110. In the initial state, compressed air is supplied to the head valve chamber 605, and the head valve 606 is kept at the bottom dead center due to the difference in pressure receiving area from the force received by the lower surface of the head valve 606 from the pressure accumulating chamber and the spring force. I'm leaning. When the pressure in the head valve chamber 605 decreases to about atmospheric pressure, the head valve 606 moves to the top dead center by the force received from the pressure accumulating chamber.

  As shown in FIGS. 11 to 12, the control valve 600 includes a sleeve valve 703 provided in a fifth air passage 270 formed in the main body 100. A valve chamber 701 for providing a control valve 600 is formed in the main body 100, a communication pipe 702 communicating with the fifth air passage 270 is provided in the valve chamber 701, and a sleeve valve 703 is provided on the outer periphery of the communication pipe 702. Is slidably provided. In the main body 100, an inlet hole 704 communicating with the pressure accumulating chamber 400 and an outlet hole 705 communicating with the atmosphere are formed. A spring 706 is provided in the valve chamber 701 to urge the sleeve valve 703 in the valve opening direction when the pressure in the pressure accumulating chamber 400 is equal to or lower than the set pressure. In this case, as shown in FIG. 11, the first ventilation hole 707 provided in the communication pipe 702 and the second ventilation hole 708 provided in the sleeve valve 703 communicate with each other, and compressed air flows into the head valve chamber 605. Driving is inhibited by continuing. Also in the third embodiment, when the pressure in the pressure accumulating chamber 400 is lower than a predetermined pressure, the control valve 600 is driven to suppress the pressure change in the main valve chamber even if the trigger valve 220 is operated. Absent.

  According to the driving machine 1 of this embodiment, unlike the driving machines of the first and second embodiments, driving is performed by reducing the pressure in the head valve chamber 605. Therefore, the operation and action is that the driving is inhibited by the continued flow of compressed air into the head valve chamber 605.

  The present invention is not limited to the embodiment described above, and various design changes can be made within the scope of the gist of the present invention. For example, in the second embodiment, the pressure in the main valve chamber 161 is not increased by blocking the air passage between the push lever valve 240 and the trigger valve 220 when the pressure of the compressed air becomes a predetermined value or less. The control valve 600 may be configured as described above. Further, in the third embodiment, when the pressure of the compressed air becomes equal to or lower than a predetermined value, the air passage between the push lever valve 240 and the trigger valve 220 is blocked so as not to reduce the pressure in the main valve chamber. Alternatively, the control valve 600 may be configured.

1 Nailer (driving machine)
2 Nail (stopper)
3 Target material 100 Main body 110 Cylinder 111 Check valve 112 First air passage 113 Second air passage 120 Piston 130 Driver blade 140 Return air chamber 150 Piston bumper 161 Main valve chamber 162 First spring 163 Third air passage 164 Exhaust Valve 200 Handle portion 210 Trigger 212 Second spring 220 Trigger valve (second valve)
221 First valve member 222 First locking portion 223 Trigger valve chamber 224 First opening portion 230 Trigger plunger 240 Push lever valve 241 Bush 241a Passage 241b Open end 241c Second locking portion 241e Second opening 241f Exhaust port 242 Second Two valve member 243 Third spring 250 Push lever plunger 251 Plunger 260 Fourth air passage 270 Fifth air passage 300 Nose portion 310 Injection portion 311 Injection passage 320 Push lever 321 Push lever main body portion 322 Push lever spring 400 Pressure accumulating chamber 401 Connection Port 500 Magazine 600 Control valve (third valve)
601 Control valve chamber 601a Fourth opening 601b Fifth opening 602 Valve bush 602a Vent hole 602b Sixth opening 602c Open valve 602d Outward flange 603 Valve sleeve 603a Seal member 603b End face 604 Fourth spring 605 Head valve chamber 606 Head valve 701 Valve chamber 702 Communication pipe 703 Sleeve valve 704 Inlet hole 705 Outlet hole 706 Spring 707 First vent hole 708 Second vent hole

Claims (7)

  A pressure accumulating chamber for storing compressed air; a cylinder housing a piston for striking a stopper with compressed air supplied from the pressure accumulating chamber; a main valve for selectively communicating and shutting off the pressure accumulating chamber and the inside of the cylinder; And a trigger valve for controlling the main valve, wherein the main valve is open even when the pressure of the compressed air in the pressure accumulating chamber is less than a predetermined pressure. A driving machine equipped with a control valve that restricts the operation of the machine. Communicating with the trigger valve, and having a main valve chamber for operating the main valve by causing pressure fluctuations according to the operation of the trigger valve;
2. The driving machine according to claim 1, wherein the control valve suppresses a pressure change in the main valve chamber even when the trigger valve operates when a pressure in the pressure accumulating chamber is lower than a predetermined pressure. The control valve is slidable between a valve bush having a vent hole communicating the accumulator chamber and the trigger valve, a first position for opening the vent hole, and a second position for closing the vent hole. A valve sleeve, and a spring for holding the valve sleeve in the second position,
The valve sleeve is displaced from the second position to the first position against the biasing force of the spring when the pressure of the compressed air supplied from the pressure accumulating chamber becomes equal to or higher than the predetermined pressure. The driving machine according to claim 2.   4. The driving machine according to claim 3, wherein the vent hole is formed on an outer peripheral surface of the valve bush, and the valve sleeve is slidably provided on the outer peripheral surface of the valve bush.   4. The driving machine according to claim 3, further comprising an opening valve for opening the compressed air remaining in the valve bush into the pressure accumulating chamber when the compressed air in the pressure accumulating chamber is opened to the atmosphere.   The valve for control has a vent hole communicating with the pressure accumulating chamber and the trigger valve, and the valve sleeve is provided slidably on the outer peripheral surface of the valve bush and opens and closes the vent hole; The driving machine according to claim 3, further comprising: a spring that urges the valve sleeve in a direction to close the vent hole against a pressure of compressed air supplied from the pressure accumulating chamber.   4. The driving machine according to claim 3, wherein the control valve comprises a sleeve valve provided in an air passage formed in the main body.

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