JP5741940B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine.

  As shown in FIG. 6, a conventional nailing machine 101 includes a housing 102 in which a pressure accumulating chamber 102a in which compressed air is stored, a cylinder 103, a piston 104 accommodated in the cylinder 103, and a driver for hitting a nail. It has a blade 141, a head valve 105 disposed at the top of the cylinder 103, and a trigger 112. A return air chamber 136 is formed in the housing 102, and the piston returns to the top dead center by the compressed air stored in the return air chamber 136 after being driven. The cylinder 103 is formed with a check valve 103a and an air passage 103b communicating with the return air chamber 136. A head valve chamber 151 in which the head valve 105 is accommodated is formed at the top of the head valve 105. The head valve 105 communicates / blocks the pressure accumulating chamber 102 a and the cylinder 103 based on the pressure in the head valve chamber 151.

  In the nailing machine 101, when the operator pulls the trigger 112, the head valve 105 causes the pressure accumulation chamber 102a and the cylinder 103 to communicate with each other, and the compressed air in the pressure accumulation chamber 102a flows into the cylinder 103. Thereby, the piston 104 is pushed down and a nail (not shown) is driven into the driven material. At this time, as the piston 104 descends, the air in the cylinder lower chamber and the compressed air in the cylinder upper chamber flow into the return air chamber 136 via the check valve 103a and the air passage 103b.

  When the operator returns the trigger 112, the head valve 105 shuts off the pressure accumulation chamber 102a and the cylinder 103, and releases the compressed air in the cylinder upper chamber to the atmosphere from an air passage (not shown).

JP 2003-236768 A

  When driving a stopper in the driving machine described in Patent Document 1, the head valve is raised, and the pressure accumulating chamber and the cylinder communicate with each other. Then, when the compressed air in the pressure accumulating chamber flows into the cylinder, the piston is rapidly lowered to drive the stopper. Immediately after the stopper is driven, the piston is rapidly lowered, so that the pressure on the upper side of the piston is smaller than the pressure in the pressure accumulating chamber. Therefore, the compressed air in the pressure accumulation chamber flows into the cylinder until the pressure on the piston upper side in the cylinder is equal to the pressure in the pressure accumulation chamber. After driving the stop, that is, after the piston reaches bottom dead center, the compressed air flowing into the cylinder is discharged without any work. Further, since the return air chamber and the pressure accumulating chamber communicate with each other while the piston is descending, useless compressed air flows into the return air chamber. Further, since the pressure in the return air chamber rises, it hinders piston lowering and causes a reduction in driving force.

  In view of such circumstances, the present invention intends to provide a driving machine that reduces air consumption and increases the driving force of a piston.

  The present invention relates to a housing in which a first air chamber for storing compressed air is defined, a trigger provided in the housing, and a cylinder accommodated in the housing and movable between a first position and a second position. A piston slidably accommodated in the cylinder, a bumper which is accommodated in the housing and is abuttable with the piston, and defines a cylinder lower chamber together with the cylinder, the cylinder and the cylinder A cylinder upper chamber is defined together with the piston, and a main valve that controls communication between the cylinder upper chamber and the first air chamber in conjunction with the movement of the trigger, and the cylinder is moved in the sliding direction of the piston. A cylinder drive mechanism, wherein the housing defines a second air chamber that can communicate with the cylinder and stores air in the cylinder in conjunction with movement of the piston. The moving mechanism further includes a third air chamber defined in the housing and in communication with the cylinder, and the cylinder is moved from the first position by the communication between the cylinder upper chamber and the third air chamber. A driving machine is provided that moves to the second position.

  According to such a configuration, since the third air chamber intended to move the cylinder is provided, the cylinder can be quickly moved to the second position. Thereby, air consumption can be reduced.

In another aspect of the present invention, a housing in which a first air chamber for storing compressed air is defined, a trigger provided in the housing, and a space between a first position and a second position accommodated in the housing. A movable cylinder, a piston slidably received in the cylinder, a bumper received in the housing and abuttable with the piston, and defining a cylinder lower chamber together with the cylinder; A main valve that defines a cylinder upper chamber together with the cylinder and the piston, and controls communication between the cylinder upper chamber and the first air chamber in conjunction with the movement of the trigger; A cylinder drive mechanism that moves in a direction, and the housing defines a second air chamber that is capable of communicating with the cylinder and stores air in the cylinder in conjunction with movement of the piston. The cylinder drive mechanism moves the cylinder from the first position to the second position after the main valve communicates the cylinder upper chamber and the first air chamber, and the first position is The cylinder upper chamber and the second air chamber are blocked from each other. The second position allows the cylinder upper chamber and the second air chamber to communicate with each other, and the cylinder upper chamber and the first air chamber. The cylinder driving mechanism further includes a third air chamber defined in the housing and communicating with the cylinder, wherein the cylinder upper chamber, the third air chamber, By providing communication, the cylinder moves from the first position to the second position .

  According to such a configuration, when the main valve communicates the cylinder upper chamber and the first air chamber and the compressed air in the first air chamber flows into the cylinder, the cylinder is in the first position and the cylinder upper chamber Since the second air chamber is shut off, the compressed air flowing from the first air chamber into the cylinder upper chamber does not flow into the second air chamber. When the cylinder moves to the second position, the compressed air in the cylinder upper chamber flows into the second air chamber in a state where the communication between the cylinder upper chamber and the first air chamber is interrupted. As a result, only the compressed air existing in the cylinder upper chamber flows into the second air chamber, so that excessive compressed air can be prevented from flowing into the second air chamber, and the air consumption can be reduced. . Further, when the main valve causes the cylinder upper chamber to communicate with the first air chamber and the compressed air in the first air chamber flows into the cylinder, the cylinder is in the first position and the cylinder upper chamber and the second air chamber Is blocked, it is possible to prevent an increase in pressure in the second air chamber. Thereby, driving force can be raised.

  Further, it is preferable that the second air chamber and the cylinder lower chamber always communicate with each other.

  According to such a configuration, the air in the cylinder upper chamber flows into the second air chamber, and the air flows into the cylinder lower chamber. The air flowing into the cylinder lower chamber is effectively used for returning the piston. Thereby, it becomes possible to reduce the air consumption of a driving machine.

  The cylinder driving mechanism further includes a third air chamber defined in the housing and communicating with the cylinder. The cylinder upper chamber and the third air chamber communicate with each other, whereby the cylinder is It is preferable to move from the first position to the second position.

  According to such a configuration, since the cylinder driving mechanism further includes the third air chamber, the cylinder can be quickly moved to the second position. Thereby, air consumption can be reduced.

  The cylinder driving mechanism further includes a fourth air chamber that is defined in the housing and communicates with the first air chamber in conjunction with the movement of the trigger, and the fourth air chamber is connected to the first air chamber. When in communication, the cylinder preferably moves from the second position to the first position.

  According to such a configuration, the cylinder can be moved with a simple structure.

  Further, it is preferable that a biasing member for biasing the cylinder from the second position to the first position is disposed in the fourth air chamber.

  According to such a configuration, it is possible to adjust the movement of the trigger and the timing of the movement of the cylinder by adjusting the biasing force of the biasing member. Thereby, a cylinder can be moved at the timing with the least air loss.

  And a fifth air chamber that is defined in the housing and communicates with the first air chamber in conjunction with the movement of the trigger, and the fifth air chamber communicates with the first air chamber. Preferably, the main valve blocks communication between the first air chamber and the cylinder, and the fourth air chamber and the fifth air chamber are always in communication.

  According to such a configuration, since the fourth air chamber communicates with the first air chamber in conjunction with the movement of the trigger, the movement of the trigger and the movement of the cylinder can be linked with a simple configuration.

  ADVANTAGE OF THE INVENTION According to this invention, the driving device which reduced the air consumption and raised the driving force of the piston can be provided.

Overall view of a nailing machine according to an embodiment of the present invention Partial sectional view of a nail driver according to an embodiment of the present invention The fragmentary sectional view when the head valve of the nailing machine of the embodiment of the present invention is raised Partial sectional view when the piston and the bumper of the nail driver of the embodiment of the present invention abut and the cylinder is located at the top dead center The fragmentary sectional view when the head valve of the nail driver of the embodiment of the present invention pushes down the cylinder Overall view of conventional nailer

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The nail driver 1 which is an example of the driving machine of the present invention is a tool for driving a nail 11 which is a stopper, and uses compressed air as its power.

  As shown in FIG. 1, the nailing machine 1 includes a housing 2, a cylinder 3 accommodated in the housing 2, a piston 4 accommodated in the cylinder 3, and a contact position received in the housing 2 and in contact with the cylinder 3. And a head valve 5 that can move between the cylinder 3 and a separated position separated from the cylinder 3, and a nose portion 6 that extends from the housing 2. The housing 2 includes a handle 2 </ b> A located on one side of the housing 2. In FIG. 1, the direction in which the handle 2 </ b> A extends from the housing 2 is defined as the rear, and the opposite is defined as the front. A direction in which the nose portion 6 extends from the housing 2 is defined as a downward direction, and the opposite direction is defined as an upward direction. Further, a direction orthogonal to the front-rear direction and the up-down direction is defined as a left-right direction (the front side in FIG. 1 is the left direction, and the back side is the right direction).

  A pressure accumulating chamber 2a is formed in the handle 2A and the housing 2 in order to store compressed air from a compressor (not shown). The pressure accumulating chamber 2a is connected to the compressor via an air hose (not shown). An exhaust port 2 b communicating with the outside is formed in the upper part of the housing 2. The pressure accumulating chamber 2a corresponds to the first air chamber of the present invention.

  The base of the handle 2 </ b> A communicates with a trigger 12 operated by an operator, a push lever 13 extending from the lower end of the nose portion 6 to the vicinity of the protrusion trigger 12, and a head valve 5 to be described later to send and exhaust compressed air. A trigger valve portion 14 that is a switching valve and a plunger 15 that transmits the operation of the trigger 12 to the trigger valve portion 14 are provided. The push lever 13 is urged from the housing 2 toward the nose portion 6 and is configured to be movable in the vertical direction along the nose portion 6. A control passage 14a is formed in the housing 2, and the trigger valve portion 14 is connected to a cylinder biasing chamber 33 (described later) and a head valve chamber 51 (described later) via the control passage 14a. The plunger 15 of the trigger valve portion 14 is configured to be pushed up when both the pulling operation of the trigger 12 and the pressing operation of the push lever 13 against the workpiece are performed.

  The cylinder 3 has a substantially cylindrical shape, and is divided into a cylinder upper chamber 37 (FIG. 3) and a cylinder lower chamber 38 by the piston 4. As shown in FIG. 2, a flange portion 31 that protrudes radially outward from the outer peripheral surface of the cylinder 3 is provided at a substantially central portion in the vertical direction of the cylinder 3. The flange portion 31 is provided with an outer peripheral surface 31A that is in sliding contact with the housing 2. A cylinder plate 32 that is annular and is fixed to the housing 2 is provided above the flange portion 31. The cylinder plate 32 is slidably in contact with the outer periphery of the cylinder 3 on the inner peripheral surface. Immediately below the flange portion 31, a wall portion 2 </ b> B that protrudes inward in the radial direction of the cylinder 3 from the housing 2 is provided and is in contact with the outer peripheral surface of the cylinder 3. The cylinder 3 is slidable with respect to the wall 2B.

  Above the flange portion 31, a cylinder biasing chamber 33 is formed by the outer peripheral surface of the cylinder 3, the flange portion 31, the housing 2, and the cylinder plate 32, and below the flange portion 31, the outer peripheral surface of the cylinder 3. A cylinder drive chamber 34 is formed by the flange portion 31 and the wall portion 2B. The cylinder plate 32 is provided with two O-rings 32 </ b> A and 32 </ b> B for blocking communication between the pressure accumulation chamber 2 a and the cylinder biasing chamber 33. An O-ring 31B for blocking communication between the cylinder biasing chamber 33 and the cylinder drive chamber 34 is provided on the outer peripheral surface 31A of the flange portion 31. The wall portion 2B is provided with an O-ring 2C for blocking communication between a cylinder drive chamber 34 and a return air chamber 36 described later. The cylinder biasing chamber 33 is connected to the trigger valve portion 14 via the control passage 14a. The cylinder biasing chamber 33 is provided with a spring 35 that has one end in contact with the cylinder plate 32 and the other end in contact with the flange portion 31 to bias the flange portion 31 downward. In the cylinder 3, an air passage 34 a that communicates the cylinder driving chamber 34 and the cylinder 3 is formed. The flange portion 31, the cylinder biasing chamber 33, the cylinder driving chamber 34, and the spring 35 correspond to the cylinder driving mechanism of the present invention. The cylinder biasing chamber 33 corresponds to the fourth air chamber of the present invention, and the cylinder drive chamber 34 corresponds to the third air chamber of the present invention.

  The cylinder 3 has a top dead center where the upper surface of the flange portion 31 is in contact with the cylinder plate 32 and the upper end of the cylinder 3 is in contact with the head valve 5 in a state where the head valve 5 is located at the separated position (FIG. 4). The lower end of the flange portion 31 and the housing 2 are in contact with each other, and the bottom dead center where the lower end of the cylinder 3 and a bumper 43 described later are in contact (FIG. 3) can be moved in the vertical direction. The top dead center corresponds to the second position of the present invention, and the bottom dead center corresponds to the first position of the present invention.

  A return air chamber 36 for storing compressed air for returning the piston 4 to the initial state (FIG. 1) is formed on the outer periphery of the lower portion of the cylinder 3. An air passage 3a communicating with the return air chamber 36 and an air passage 3b immediately below the air passage 3a are formed in the lower portion of the cylinder 3. Specifically, as shown in FIG. 4, when the piston 4 abuts against a bumper 43 described later and the cylinder 3 moves to the top dead center, the cylinder upper chamber 37 and the return air chamber 36 communicate with each other. The air passage 3a is formed, and the air passage 3b is formed at a position where the cylinder lower chamber 38 and the return air chamber 36 communicate with each other. The volume of the return air chamber 36 is configured to be larger than the cylinder biasing chamber 33. The return air chamber 36 corresponds to the second air chamber of the present invention.

  The piston 4 is slidable in the vertical direction in the cylinder 3, and a driver blade 41 extending downward is fixed. A piston ring 42 that blocks communication between the cylinder upper chamber 37 and the cylinder lower chamber 38 is fitted to the outer periphery of the piston 4. Below the cylinder 3, a bumper 43 for absorbing surplus energy of the piston 4 after the nail 11 is driven is provided. The bumper 43 is an elastic body such as urethane or nitrile rubber (NBR).

  The head valve 5 is disposed on the upper side of the cylinder 3. A head valve chamber 51 in which the head valve 5 is accommodated is formed in the housing 2, and a head valve spring 52 that biases the head valve 5 downward is provided in the head valve chamber 51. A head bumper 53 is provided inside the head valve 5. The head bumper 53 shuts off the pressure accumulating chamber 2a and the outside when the head valve 5 is in the separated position (FIG. 3). The head valve 5 is formed with an air passage 51a that can communicate with the exhaust port 2b. The head valve chamber 51 communicates with the trigger valve portion 14 and the cylinder biasing chamber 33 via the control passage 14a. In the initial state shown in FIG. 1, the head valve chamber 51 is filled with compressed air, and the head valve 5 is biased downward by the compressed air in the head valve chamber 51 and the head valve spring 52. The force with which the head valve spring 52 urges the head valve 5 downward is smaller than the force with which the compressed air in the pressure accumulating chamber 2a pushes the head valve 5 upward. Accordingly, when the compressed air in the head valve chamber 51 is released and the atmospheric pressure is reached, the head valve 5 moves upward against the urging force of the head valve spring 52. The head valve chamber 51 corresponds to the fifth air chamber of the present invention.

  As shown in FIG. 1, the nose portion 6 is located at the lower end of the housing 2, and a guide path 61 for guiding the driver blade 41 and the nail 11 is formed. An injection hole through which the nail 11 is injected is defined at the lowermost position of the guide path 61. Behind the nose portion 6 is provided a magazine device 62 that houses a bundle of nails in which a plurality of nails (not shown) are bundled and connected. The magazine device 62 is provided with a nail feeder that sequentially feeds the nails 11 loaded in the magazine 63 into the guide path 61.

  Next, the operation of the nailing machine 1 will be described.

  When an air hose (not shown) is connected, compressed air is accumulated in the pressure accumulating chamber 2a, and a part thereof flows into the head valve chamber 51 and the cylinder energizing chamber 33 via the trigger valve portion 14 and the control passage 14a. The compressed air sent to the head valve chamber 51 pushes down the head valve 5 to further bring the head valve 5 and the cylinder 3 into close contact with each other, thereby preventing the compressed air from flowing into the cylinder 3. The cylinder 3 is urged downward by the compressed air in the head valve 5, the spring 35, and the cylinder urging chamber 33, and is located at the bottom dead center.

  When the operator pulls the trigger 12 with the push lever 13 pressed against the workpiece, the plunger 15 is pushed up, and the trigger valve section 14 communicates the control passage 14a with the outside air, and the head valve chamber 51 and the cylinder are attached. The chamber 33 is at atmospheric pressure. The head valve 5 moves upward by the differential pressure between the compressed air stored in the pressure accumulating chamber 2 a and the head valve chamber 51. As a result, the compressed air stored in the pressure accumulating chamber 2a flows into the cylinder upper chamber 37, pushes down the piston 4, and changes from the state shown in FIG. 2 to the state shown in FIG. At this time, the cylinder 3 is located at the bottom dead center by the biasing force of the spring 35.

  When the piston 4 passes through the air passage 34a, the compressed air in the cylinder upper chamber 37 flows into the cylinder drive chamber 34 and presses the flange portion 31 upward. Further, the piston 4 descends and comes into contact with the bumper 43, and the air passage 3 a is blocked by the side surface of the piston 4. The cylinder 3 moves to the top dead center against the urging force of the spring 35 by the compressed air in the cylinder drive chamber 34. As shown in FIG. 4, when the cylinder 3 moves to the top dead center, the cylinder upper chamber 37 and the pressure accumulating chamber 2a are shut off, and the cylinder upper chamber 37 and the return air chamber 36 are connected via the air passage 3a. Can communicate. As indicated by the arrow A, the compressed air in the cylinder upper chamber 37 flows into the return air chamber 36. At this time, the outer peripheral surface 31 </ b> A blocks a part of the opening of the control passage 14 a of the cylinder biasing chamber 33. By such movement of the piston 4, the nail 11 is driven into the driven material. In the present embodiment, the flow of compressed air into the return air chamber 36 is started when the piston 4 contacts the bumper 43, and only the compressed air existing in the cylinder upper chamber 37 flows into the return air chamber 36. .

  When the operator returns the trigger 12, the plunger 15 returns to the initial position, and compressed air is supplied to the cylinder urging chamber 33 and the head valve chamber 51 via the control passage 14a. As a result, as shown in FIG. 5, the head valve 5 is pushed downward, and the head valve 5 and the cylinder 3 move together downward. As a result, the cylinder 3 moves to the bottom dead center, and the cylinder upper chamber 37 and the return air chamber 36 are shut off. At substantially the same time or thereafter, the cylinder upper chamber 37 communicates with the exhaust port 2b via the air passage 51a, and the cylinder upper chamber 37 becomes atmospheric pressure. Specifically, the length of the head bumper 53 in the vertical direction is such that the timing of communication between the cylinder upper chamber 37 and the exhaust port 2b is after or substantially at the same time as the timing of shutting off the cylinder upper chamber 37 and the return air chamber 36. It is set slightly shorter than the moving distance of the valve 5. When the cylinder upper chamber 37 becomes atmospheric pressure, the compressed air stored in the return air chamber 36 flows into the cylinder lower chamber 38 through the air passage 3b and pushes the piston 4 upward, and the initial state shown in FIG. It becomes a state.

  In the nailing machine 1, when the head valve chamber 51 is filled with compressed air, if the cylinder biasing chamber 33 is also filled with compressed air, the cylinder 3 moves to the bottom dead center earlier than the head valve 5 is lowered. May end up. Then, the cylinder 3 and the head valve 5 are separated from each other and the cylinder upper chamber 37 and the pressure accumulating chamber 2a communicate with each other, so that compressed air flows into the cylinder upper chamber 37 and the air consumption increases. However, in the present embodiment, as shown in FIG. 4, when the cylinder 3 is located at the top dead center, the outer peripheral portion 31A partially blocks the control passage 14a. Even if compressed air flows into 34, a rapid pressure rise is suppressed. Thereby, it is possible to prevent the compressed air from excessively flowing into the cylinder upper chamber 37 and reliably reduce the air consumption.

  According to such a configuration, when the head valve 5 causes the cylinder upper chamber 37 and the pressure accumulation chamber 2a to communicate with each other and the compressed air in the pressure accumulation chamber 2a flows into the cylinder upper chamber 37, the cylinder 3 is at the bottom dead center. Since the upper chamber 37 and the return air chamber 36 are shut off, the compressed air flowing into the cylinder upper chamber 37 from the pressure accumulation chamber 2 a does not flow into the return air chamber 36. When the cylinder 3 moves to the top dead center, the compressed air in the cylinder upper chamber 37 flows into the return air chamber 36 in a state where the communication between the cylinder upper chamber 37 and the pressure accumulating chamber 2a is cut off. Thereby, since only the compressed air existing in the cylinder upper chamber 37 flows into the return air chamber 36, it is possible to prevent excessive compressed air from flowing into the return air chamber 36 and to reduce air consumption. . Further, since the cylinder upper chamber 37 and the return air chamber 36 do not communicate with each other until the piston 4 comes into contact with the bumper 43, it is possible to prevent an increase in the pressure of the return air chamber 36 when the piston 4 is lowered. Thereby, the driving force of the nail driver 1 can be increased.

  According to such a configuration, the air in the cylinder upper chamber 37 flows into the return air chamber 36, and the air flows into the cylinder lower chamber 38 after being driven. The air flowing into the cylinder lower chamber 38 is effectively used to return the piston 4. Thereby, it becomes possible to reduce the air consumption of the nailing machine 1.

  According to such a configuration, the cylinder 3 can be moved with a simple structure.

  According to such a configuration, the movement of the trigger 12 and the timing of movement of the cylinder 3 can be adjusted by adjusting the biasing force of the spring 35. Thereby, the cylinder 3 can be moved at the timing with the least air loss.

  According to such a configuration, the cylinder urging chamber 33 communicates with the pressure accumulating chamber 2a in conjunction with the movement of the trigger 12, so that the movement of the trigger 12 and the movement of the cylinder 3 can be linked with a simple configuration.

  According to such a configuration, when the piston 4 has driven the nail 11 (when the piston 4 and the bumper 43 are in contact), the cylinder 3 is moved to shut off the cylinder upper chamber 37 and the pressure accumulating chamber 2a. Sufficient energy can be given to the piston 4 until the nail 11 is driven.

  The present invention is not limited to the above-described embodiments, and various improvements and modifications can be made within the scope described in the claims. For example, although a head valve positioned above the cylinder is adopted as an example of the main valve, a structure in which the main valve is disposed on the side surface above the cylinder may be employed.

  In the embodiment described above, the spring 35 is provided in the cylinder biasing chamber 33, but the spring 35 may not be provided.

1 ·· Nailer 2 ·· Housing 3 · Cylinder 4 · Piston 5 · Head valve 6 · Nose portion 11 · Nail 12 · Trigger 14 · Trigger valve portion 14a · · Air passage 31 ··· Flange 33, Cylinder biasing chamber 34, Cylinder drive chamber 35, Spring 36, Return air chamber 37, Cylinder upper chamber 38, Cylinder lower chamber 41, Driver blade 43, Bumper 51, Head Valve chamber

Claims (5)

A housing in which a first air chamber for storing compressed air is defined;
A trigger provided on the housing;
A cylinder housed in the housing and movable between a first position and a second position;
A piston slidably accommodated in the cylinder;
A bumper accommodated in the housing and capable of contacting the piston and defining a cylinder lower chamber together with the cylinder;
A main valve that defines a cylinder upper chamber together with the cylinder and the piston, and controls communication between the cylinder upper chamber and the first air chamber in conjunction with movement of the trigger;
A cylinder drive mechanism for moving the cylinder in the sliding direction of the piston, and the housing is capable of communicating with the cylinder and storing air in the cylinder in conjunction with movement of the piston. 2 air chambers are defined,
The cylinder drive mechanism moves the cylinder from the first position to the second position after the main valve communicates the cylinder upper chamber and the first air chamber, and the first position is The cylinder upper chamber and the second air chamber are blocked from each other. The second position allows the cylinder upper chamber and the second air chamber to communicate with each other, and the cylinder upper chamber and the first air chamber. Where the air chamber is blocked,
The cylinder driving mechanism further includes a third air chamber defined in the housing and communicating with the cylinder, and the cylinder is communicated with the first air chamber by the communication between the cylinder upper chamber and the third air chamber. A driving machine characterized by moving from a position to the second position. 2. The driving machine according to claim 1 , wherein the second air chamber and the cylinder lower chamber are always in communication. The cylinder driving mechanism further includes a fourth air chamber that is defined in the housing and communicates with the first air chamber in conjunction with the movement of the trigger, and the fourth air chamber communicates with the first air chamber. 2. The driving machine according to claim 1 , wherein the cylinder moves from the second position to the first position. 4. The driving machine according to claim 3 , wherein a biasing member for biasing the cylinder from the second position to the first position is disposed in the fourth air chamber. A fifth air chamber defined in the housing and communicating with the first air chamber in conjunction with the movement of the trigger; and when the fifth air chamber and the first air chamber communicate with each other, 5. The driving machine according to claim 4 , wherein the main valve blocks communication between the first air chamber and the cylinder, and the fourth air chamber and the fifth air chamber are always in communication. .

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