JP6464930B2 - Driving machine - Google Patents

Description

  The present invention relates to a structure of a driving machine for driving a stopper member using compressed air (high pressure air).

  2. Description of the Related Art A driving machine for driving a stopper member (nail, screw, etc.) engaged with a plate material, for example, wood, gypsum board, steel plate, etc. (fastened member) using compressed air (high pressure gas) as a power source is known. . In the nailing machine, the nail is driven in one direction with a strong driving force. In the screw driving machine, the screw is similarly driven by a distance shorter than the entire length of the screw, and then rotated and tightened. Operation is performed.

  As the compressed air, for example, one generated by a compressor or the like and stored in a tank can be used. For this reason, in such a driving machine, an air plug to which an air hose for supplying compressed air is detachably attached is provided, and the driving machine is used with the hose attached to the air plug. In a screwdriver, a driver bit is attached to a piston that is moved by the pressure of compressed air, and when a trigger or the like attached to the screwdriver is operated, the piston and the driver bit are lowered, and the lower end of the screw and a screw An operation for driving in the length (a driving operation) is performed. Thereafter, the screw is further rotated by further rotating the driver bit, and the tightening operation (tightening operation) is performed. In the tightening operation, the driver bit is rotated by an air motor that operates by supplying compressed air.

  In such a screwdriver, the operation of the piston and the air motor is performed by the supplied compressed air, and this compressed air is temporarily stored in a pressure accumulating chamber provided inside the screwdriver, and then It is sent to each part to perform the operation. Here, a plurality of valves for controlling the flow of compressed air are also used in order to control the operation of the piston and the air motor inside the screwdriver. In such a screwdriver, a power source (for example, a power source) other than compressed air is not used, so this compressed air is also used in controlling this valve.

  In such a screwdriver, first, the compressed air pushes down the piston, and after the driver bit is lowered to a predetermined position by the driving operation, a part of the compressed air that pushed down the piston flows to the air motor side. A rotation operation (tightening operation) is performed. For this reason, the driver bit automatically rotates when the driver bit is lowered by a predetermined length. The compressed air that has driven the air motor is then exhausted. With such a configuration, a stable screwing operation can be performed.

  At this time, even if the hardness of the wood or the like to which the screw is fastened and the thickness of the screw are various, it is required to stably perform the driving operation and the tightening operation. In order to cope with such various situations, Patent Document 1 includes a pressure regulator for adjusting the pressure of compressed air supplied from the outside via an air hose (air plug). A screwdriver is described in which the pressure of the stored compressed air is adjustable. In this pressure regulator, pressure adjustment (switching) is particularly easily performed, so that the force in the driving operation and the tightening operation can be easily adjusted. In addition, since the pressure regulator is small and light, the increase in the weight of the screwdriver due to this is small.

JP 2008-188741 A

  In the above screwdriver, the pressure of the compressed air used for the operation can be adjusted. However, for example, depending on the type of member to be fastened and the combination of the fastened member and the fastener member, when it is desired to increase the force in the driving operation and reduce the force in the tightening operation, or vice versa, There are also cases where it is desired to increase the force in the tightening operation by reducing it. In the screw driving machine described in Patent Document 1, it is impossible to cope with such a case.

  That is, in a screw driving machine using compressed air as a power source, it is desired to independently control the force in the driving operation and the force in the tightening operation.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
The driving machine according to the present invention includes a driving operation for driving a stopper member into a member to be fastened along a driving direction, and a tightening operation for rotating and tightening the stopper member to drive compressed air supplied from the outside. And a first pressure adjusting means for adjusting a pressure of compressed air used for the driving operation, and a pressure of the compressed air used for the tightening operation to adjust the first pressure. And a second pressure adjusting means that is separate from the adjusting means.
The driving machine according to the present invention is equipped with a driver bit that performs the driving operation and the tightening operation by coming into contact with the stopper member, and the driver bit is mounted, and moves along the driving direction during the driving operation. And a piston that rotates around the driving direction during the tightening operation, a spindle in which the piston is housed, and an air motor that rotates the piston by being supplied with compressed air, The driving operation is performed by introducing compressed air into the spindle, and the tightening operation is performed by supplying compressed air to the air motor after the driving operation.
The driving machine of the present invention is a path through which compressed air introduced into the spindle during the driving operation is discharged after the driving operation, and is used for tightening operation control provided outside the spindle. An air passage is provided.
The driving machine of the present invention includes a pressure accumulating chamber for storing compressed air supplied from the outside and adjusted in pressure by the first pressure adjusting means, and introduces the compressed air in the pressure accumulating chamber into the spindle. The driving operation is performed by the following.
The driving machine of the present invention supplies the compressed air in the air passage for tightening operation control to the second pressure adjusting means, and supplies the compressed air whose pressure is adjusted by the second pressure adjusting means to the air motor. Thus, the tightening operation is performed.
The driving machine of the present invention includes a pilot valve that performs the tightening operation by supplying compressed air to the air motor side when the pressure of the air in the air passage for tightening operation control is high. Features.
The driving machine according to the present invention supplies compressed air from the pressure accumulating chamber to the second pressure adjusting means via the pilot valve, and supplies the compressed air whose pressure is adjusted by the second pressure adjusting means to the air motor. Thus, the tightening operation is performed.
The driving machine according to the present invention supplies compressed air supplied from the outside via the pilot valve to the second pressure adjusting means without going through the accumulator, and the pressure is adjusted by the second pressure adjusting means. The tightening operation is performed by supplying the compressed air to the air motor.

  Since the present invention is configured as described above, in the screw driving machine using compressed air as a power source, the force in the driving operation and the force in the tightening operation can be controlled independently.

It is sectional drawing which shows the whole structure of the screwdriver which becomes embodiment of this invention. It is sectional drawing which shows the structure of the 2nd pressure regulator in the screwdriver which becomes embodiment of this invention. It is a figure (the 1) which shows sequentially the operation | movement in the screwdriver which becomes embodiment of this invention. It is FIG. (The 2) which shows sequentially the operation | movement in the screwdriver which becomes embodiment of this invention. It is FIG. (The 3) which shows sequentially the operation | movement in the screwdriver which becomes embodiment of this invention. It is sectional drawing which shows the structure of the 1st modification of the screwdriver which becomes embodiment of this invention. It is sectional drawing which shows the structure of the 2nd modification of the screwdriver which becomes embodiment of this invention.

(First embodiment)
The configuration of the screw driving machine (driving machine) according to the first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing the configuration of the screwdriver 1. By this screw driving machine 1, the screw (fastening member) P is driven into a plate material or the like (fastened member S) placed on the lower side, and in FIG. 1, the axial direction (drive-in direction) in which the screw P is driven. FIG. Here, the driving direction is the vertical direction.

  In this screw driving machine 1, a driving force is applied to the screw P in the substantially cylindrical housing 10 with the driving direction as a central axis to apply a driving force downward, and then the screw P is moved. A mechanism for performing a rotating tightening operation is provided. Compressed air supplied from the outside is used as a power source for these operations. In addition, a plurality of valves for controlling the flow of compressed air are provided to perform each operation, and compressed air is also used for controlling the operation of these valves.

  In FIG. 1, a handle 50 that extends in a direction (front-rear direction) intersecting the housing 10 and is gripped by an operator is fixed behind the housing 10. An air plug 51 to which an air hose (not shown) for supplying compressed air from the outside is attached is provided at the rear end (right end in FIG. 1) of the handle 50. The compressed air is stored in the pressure accumulating chamber 52 provided in the handle 50 from the air plug 51 and supplied to the housing 10 side. A first pressure regulator (first pressure regulator) 53 is provided in the air path between the air plug 51 and the pressure accumulating chamber 52, and the first pressure regulator 53 regulates the pressure of the compressed air supplied from the air hose. (Reduced pressure) and accumulated in the pressure accumulating chamber 52. The structure of the first pressure regulator 53 is the same as the pressure regulator described in Patent Document 1. In addition, it is necessary to discharge the compressed air after being used for the operation in the housing 10 to the outside. Is provided. In FIG. 1, strictly speaking, a form different from that in use is shown, and a cap 51 a is attached to the air plug 51. In actual use, the cap 51a is removed and an air hose is attached to the air plug 51 for use. The same applies to FIGS. 3 to 7 described below.

  The operation of driving and rotating the screw P downward is performed by a driver bit 11 provided so as to extend vertically on the central axis of the housing 10. The driver bit 11 moves up and down in FIG. 1 and rotates, so that one end (lower end) of the driver bit 11 drives and rotates the screw P. FIG. 1 shows a state (initial state) immediately before this operation is performed. An injection part 12 extending in the vertical direction is provided below the housing 10, and the lower end of the driver bit 11 moves in the vertical direction inside the injection part 12. A push lever 13 slidable in the vertical direction along the injection portion 12 and biased downward is attached to the lowermost end of the injection portion 12. Further, a magazine 60 that accommodates a plurality of screws P is provided on the right side of the injection unit 12 (on the same side as the handle 50). For each operation, the screw feeder 61 automatically loads one screw P into the injection unit 12. The driver bit 11 is used to perform a tightening operation for tightening by applying a rotational force after a driving operation is performed in which the loaded screw P is driven downward by a length less than the entire length thereof.

  Further, a trigger lever 14 that can be rotated in the vertical direction is provided below the connection portion between the handle 50 and the housing 10, and an operation valve 15 that is connected to the trigger lever 14 is provided above the trigger lever 14. By setting the operation valve 15 to the operated (opened) state, the above-described driving operation is first performed. However, the operation valve 15 is set to be opened when the trigger lever 14 is pulled upward and the push lever 13 is moved upward. As for the structure, a known trigger lever or push lever structure can be employed. The push lever 13 moves upward when the operator causes the lower end side of the injection portion 12 to contact the fastened member S. For this reason, when the operator pulls the trigger lever 14 upward in a state where the lower end side of the injection portion 12 is brought into contact with the place (fastened member S) where the screw P is to be driven, the screw P driving operation is started. The

  Next, a mechanism related to the operation of the driver bit 11 in the housing 10 and an operation in the housing 10 when the operation valve 15 is opened will be described.

  In the housing 10, a spindle 20 that is closed on the upper side, opened on the lower side, and rotatable is provided. The spindle 20 is provided on the upper side of the housing 10, and is further connected to an air motor 21 provided on the upper part via a planetary gear mechanism 22. The air motor 21 rotates by being supplied with compressed air. Specifically, the sun shaft in the planetary gear mechanism 22 is fixed to the output shaft (rotary shaft) of the air motor 21, and the shaft portion of the revolving gear that meshes with the sun shaft is fixed to the spindle 20. For this reason, the spindle 20 rotates within the housing 10 with an appropriate reduction ratio as the air motor 21 rotates.

  Inside the spindle 20, a slider (piston) 23 is provided so as to be movable in the vertical direction with respect to the spindle 20. However, the outer periphery of the slider 23 and the inner surface of the spindle 20 are formed so as to engage with convex portions and concave portions, respectively, and when the spindle 20 rotates, the slider 23 also rotates. That is, the slider 23 cannot rotate with respect to the spindle 20 and can move in the vertical direction. Although the slider 23 is described as being divided in the vertical direction in FIG. 1, these are actually integrated outside the range shown in the drawing.

  A sub piston portion (piston) 24 is fixed to the slider 23. The upper end (the other end) of the driver bit 11 is fixed to the sub piston portion 24. For this reason, the movement of the driver bit 11 reflects the movement of the slider 23 and the auxiliary piston part 24.

  A cylindrical cylinder 30 is fixed to the housing 10 on the lower side of the spindle 20 with the rotation axis of the spindle 20 as the central axis. On the lower side of the spindle 20, a plate portion 31 is provided on the upper portion of the cylinder 30 to lock the air blocking surface 23 </ b> A formed as a downward surface in the slider 23 when the slider 23 is lowered. .

  In addition, a main piston portion 25 is mounted inside the spindle 20 so as to surround the sub piston portion 24 on the lower side of the slider 23. However, the main piston portion 25 is not fixed to the sub piston portion 24 and the slider 23, but is movable in the vertical direction with respect to them. The outer diameter of the main piston portion 25 is smaller than the inner diameter of the cylinder 30. Further, the inner diameter of the main piston portion 25 in the portion through which the sub piston portion 24 penetrates is smaller than the outer diameter of the sub piston portion 24 on the lower side. For this reason, when the main piston part 25 descend | falls, the subpiston part 24, the driver bit 11 fixed to this, and the slider 23 can be lowered | hung.

  The slider 23, the sub piston part 24, and the main piston part 25 function as a piston that causes the driver bit 11 to move up and down by compressed air when combined. At this time, the downward movement of the slider 23 is restricted by the contact between the air blocking surface 23A and the plate portion 31, and the portion of the slider 23 above the air blocking surface 23A is lowered to the cylinder 30 side. There is no. On the other hand, the main piston portion 25 and the auxiliary piston portion 24 provided inside thereof can be lowered to the inside of the cylinder 30 during the tightening operation. A bumper 32 made of an elastic body that abuts against the sub-piston portion 24 and the like and absorbs an impact when the sub-piston portion 24 descends is provided at the lowermost end side of the cylinder 30 so as to surround the driver bit 11. When the sub-piston part 24 is lowered, a portion that spreads outward on the lower end side of the sub-piston comes into contact with the bumper 32.

  In the housing 10, a first air passage 10 a connected to the operation valve 15, a second air passage 10 b that surrounds the spindle 20 in a state of being isolated from the spindle 20 outside the spindle 20, and a cylinder 30. A return air chamber 10c is formed. The second air passage 10b is always in communication with the pressure accumulating chamber 52, and the compressed air is always stored therein, and this compressed air is used for the driving operation. The first air passage 10a is a passage for controlling the opening / closing operation of the main valve 26 described later with compressed air.

  Further, the slider chamber is formed on the upper side in the cylinder 30 and the cylinder chamber 30a is formed on the lower side by the above configuration. However, since the slider chamber is configured by connecting the space above the slider 23, the space between the side surface of the main piston portion 25 and the inner surface of the spindle 20, etc., the slider 23 is particularly at the top dead center side. In FIG. 1, the slider chamber is not clear. Near the lower side of the cylinder 30, there is a compressed air outflow hole 30b connected to a return air chamber 10c formed around the check valve. By this check valve, the flow of air from the cylinder chamber 30a to the return air chamber 10c is allowed, and the flow of air from the return air chamber 10c side to the cylinder chamber 30a side is suppressed. A compressed air inflow hole 30c that allows air flow from the return air chamber 10c side to the cylinder chamber 30a is formed further below the compressed air outflow hole 30b in the cylinder 30.

  In the above configuration, the driving operation is started by introducing the compressed air in the second air passage 10b into the slider chamber. In order to perform this operation, the above-described components are appropriately provided with a vent hole through which air passes and an O-ring. Hereinafter, this point will be described in accordance with the operations of the slider 23, the sub piston portion 24, the main piston portion 25, and the like.

  A cylinder intake port 20b is provided on the side surface of the spindle 20, and a cylinder exhaust port 20c is provided below the cylinder intake port 20b. The main valve 26 controls the introduction of compressed air into the slider chamber via the cylinder intake port 20b. The main valve 26 is movable in the vertical direction. When the main valve 26 is located on the lower side, compressed air is introduced into the slider chamber (open state). When the main valve 26 is located on the upper side, this The flow of compressed air is interrupted. In FIG. 1, the main valve 26 is closed, and this opening / closing is controlled by the operation valve 15. When the operation valve is closed, the main valve 26 is closed by storing compressed air in the main valve chamber that controls the operation of the main valve 26, and when the operation valve 15 is opened, the main valve chamber is closed. When the compressed air is extracted from the first air passage 10a through the first air passage 10a, the main valve 26 is opened.

  When the main valve 26 is opened and compressed air is introduced into the slider chamber, the slider 23, the sub piston portion 24, and the main piston portion 25 are pushed down to perform a driving operation. O-rings are appropriately attached to the outer periphery of the main piston portion 25 and the sub piston portion 24 so that the operation at this time is performed efficiently and smoothly.

  In addition, a third air passage (tightening control air passage) 10 d through which compressed air for driving the air motor 21 flows around the cylinder 30 is formed in the housing 10. The plate portion 31 is provided with a vent hole 31a that allows the inside of the cylinder 30 to communicate with the third air passage 10d. When the main piston portion 25 is lowered and the O-ring attached to the main piston portion 25 is below the vent hole 31a, a part of the compressed air on the slider chamber side passes through the vent hole 31a. 3 It flows into the air passage 10d. For this reason, in a state where the driving operation is finished and the main piston portion 25 is lowered, the compressed air is supplied to the third air passage 10d, whereby the air motor 21 can be driven to perform the tightening operation.

  Here, the third air passage 10d is connected to the air motor 21 via the second pressure regulator (second pressure adjusting means) 33 and the fourth air passage 10e. Since the compressed air supplied to the third air passage 10d is supplied from the slider chamber as described above, the pressure is a value adjusted by the first pressure regulator 53 (first set pressure). Here, the pressure of the compressed air supplied to the air motor 21 is set to a value (second set pressure) further adjusted by the second pressure regulator 33. In FIG. 1, the fourth air passage 10e is shown as being separated from the housing 10, but actually, like the second air passage 10b and the like, the fourth air passage 10e also has the housing. 10 is formed.

  FIG. 2 is an enlarged cross-sectional view showing the structure in the vicinity of the second pressure regulator 33 in FIG. The second pressure regulator 33 is configured by combining a case 331 and a cap 332 with a separator 333 interposed therebetween. When these are combined, the input side compressed air (compressed air before pressure adjustment by the second pressure regulator 33) flows on the cap 332 side (right side in FIG. 2) across the separator 333. A valve chamber 332A is formed. Here, the input side of the second pressure regulator 33 is the third air passage 10d. The pressure of the compressed air in the third air passage 10d is equal to the pressure of the compressed air stored in the pressure accumulating chamber 52 (the first set pressure set by the first pressure regulator 53).

  The valve chamber 332A is provided with a valve body 335 that is biased to the left side (separator 333 side) in the drawing by a spring 334. Further, on the left side of the separator 333, the piston 336 is formed such that a piston chamber 331A is formed between the piston 336 and the separator 333, and a spring chamber 331B is formed between the left side of the piston 336 and the left side surface of the case 331. Provided. In the spring chamber 331B, a spring 337 having one end locked to the left side surface of the case 331 and the other end locked by the piston 336 is provided, so that the piston 336 is moved to the right side (separator 333 side) by the spring 337. Be energized. Both the valve body 335 and the piston 336 are provided so as to be movable in the left-right direction in the figure with respect to the case 331 and the like.

  The separator 333 is provided with a through hole 333A that penetrates the separator 333 in the left-right direction in the drawing. On the right side of the piston 336, a piston shaft portion 336A that is elongated and protrudes toward the right side is provided so as to penetrate the through hole 333A. The clearance between the piston shaft portion 336A and the inner surface of the through hole 333A is set wide enough so that the compressed air flows between the valve chamber 332A and the piston chamber 331A without any obstacle. Further, the right end portion of the piston shaft portion 336A is fitted in a recess formed on the left surface of the valve body 335 in the drawing. Therefore, the piston 336 and the valve body 335 are integrally movable in the left-right direction in FIG.

  FIG. 2 shows a state where the piston 336 is in contact with the separator 333 in the piston chamber 331A. On the other hand, since the valve body 335 is separated from the separator 333, in FIG. 2, the compressed air that has flowed into the valve chamber 332A through the top and bottom of the valve body 335 and through the through hole 333A flows into the piston chamber 331A. The piston chamber 331A is a space on the output side of the second pressure regulator 33 and communicates with the fourth air passage 10e. For this reason, in the state shown in FIG. 2, the compressed air flows from the upstream valve chamber 332A to the fourth air passage 10e via the downstream piston chamber 331A (fourth air passage 10e). However, when the piston 336 and the valve body 335 move to the left side of the state of FIG. 2, the valve body 335 contacts the separator 333 from the right side. In this case, since the through hole 333A is closed by the valve body 335, the flow of air from the valve chamber 332A to the piston chamber 331A is blocked.

  The positions of the piston 336 and the valve body 335 in the left-right direction are determined by the balance between the force received by the valve body 335 and the force received by the piston 336. As a whole, when these resultant forces are directed to the right side, the through hole 333A is not closed by the valve body 335, and air flows from the valve chamber 332A to the piston chamber 331A. When the resultant force is directed to the left as a whole, the through hole 333A is closed by the valve body 335. Here, the force received by the valve body 335 is determined by the pressure of the compressed air supplied from the spring 334 and the pressure accumulating chamber 52 side. On the other hand, the force received by the piston 336 is also determined by the force received by the spring 337 and the compressed air by the piston 336. For this reason, the pressure (second set pressure) on the output side (piston chamber 331A) side when the through hole 333A is closed can be set by setting the springs 334 and 337.

  Therefore, in the screw driving machine 1, the pressure of the compressed air used in the driving operation is the first set pressure, and the pressure of the compressed air used in the tightening operation is the second set pressure (second set pressure ≦ first set). Pressure). In the second pressure regulator 33, the second set pressure is set by the springs 334 and 337. However, the pressure regulator described in Patent Document 1 may be used as the second pressure regulator. . In this case, even when the springs 334 and 337 are fixed, the second set pressure can be switched to a plurality by operating the knob.

  3A, 3B, 4C, 4D, and 5E are cross-sectional views sequentially showing the operation of the screw driving machine 1. FIG. Here, the flow of the compressed air and the movement of the slider 23 and the like are indicated by arrows.

  3A, from the state shown in FIG. 1 (the state where the slider 23 is located on the top dead center side and the main valve 26 is closed), the lower end side of the injection portion 12 is the member to be fastened. By being pressed against S, the push lever 13 moves relatively upward. The trigger lever 14 is pulled upward. As a result, the operation valve 15 is opened, the compressed air is extracted from the main valve chamber via the first air passage 10a, and the main valve 26 is shifted to the open state. As a result, compressed air is introduced into the cylinder chamber through the cylinder intake port 20b. As a result, as shown in FIG. 3 (b), first, a force is generated to push down the main piston portion 25, the main piston portion 25 starts to descend, and comes into contact with the sub piston portion 24 on the lower side. The sub-piston part 24, the slider 23, and the driver bit 11 are pushed down and a driving operation is performed. The pressure of the compressed air used for this driving operation is the first set pressure set by the first pressure regulator 53.

  As a result, as shown in FIG. 4C, the slider 23 and the like are lowered, and the lower end of the screw P is slightly driven into the fastened member S. In this state, the O-ring attached to the main piston portion 25 is below the vent hole 31a. Thereby, a part of the compressed air on the slider chamber side flows into the third air passage 10d through the vent hole 31a. This compressed air is supplied to the air motor 21 via the first pressure regulator 33 and the fourth air passage 10e, and drives it. Thereafter, the compressed air is discharged through the exhaust passage 54. As a result, a tightening operation is performed on the screw P.

  Here, the pressure of the compressed air that drives the air motor 21 is set to the second set pressure by the second pressure regulator 33. That is, the pressure of the compressed air used for the tightening operation is the second set pressure (≦ first set pressure). As a result, as shown in FIG. 4D, the screw P is fastened to the fastened member S, and the driver bit 11, the slider 23, and the auxiliary piston portion 24 are further lowered.

  As shown in FIG. 5 (e), these are lowered until the sub piston portion 24 comes into contact with the bumper 32. When the sub-piston portion 24 and the like are lowered to this position, the flow of compressed air to the third air passage 10d through the vent hole 31a stops. As a result, the air motor 21 stops and the tightening operation ends.

  Thereafter, when the operation valve 15 is closed and the main valve 26 is shifted to the closed state, the slider 23 and the like are pushed up again to the top dead center by the compressed air in the return air chamber 10c, and the state shown in FIG. 1 is obtained. Thus, the above operation can be performed again. The mechanism for this is the same as the technique described in Patent Document 1.

  Thus, in the screw driving machine 1, the first set pressure and the second set pressure can be set to different values, and the force in the driving operation and the force in the tightening operation can be individually adjusted. As described above, by using the pressure regulator described in Patent Document 1 (one that can change the set pressure by an operation of a knob or the like as in the first pressure regulator 53) as the second pressure regulator, It is also possible to change both the set pressure and the second set pressure stepwise. In this case, the force in the driving operation and the force in the tightening operation can be changed in finer steps.

  In said structure, a 2nd pressure regulator can be provided in various places according to a structure. FIG. 6 is a diagram showing a configuration of a screw driving machine (driving machine) 2 as such a modified example (first modified example) corresponding to FIG.

  The mechanical configuration for lowering and rotating the driver bit 11 in this screw driving machine 2 is the same as that of the screw driving machine 1, and the flow of compressed air for driving the air motor 21 is the same as that of the screw driving machine. 1 and different.

  Also in this screw driving machine 2, as with the screw driving machine 1, a main piston portion 25, a vent hole 31a, a third air passage (tightening operation control air passage) 10d and the like are provided. For this reason, when the driving operation is finished and the O-ring attached to the main piston portion 25 is below the vent hole 31a, a part of the compressed air on the slider chamber side passes through the vent hole 31a. It flows into the air passage 10d. In the screw driving machine 1, the compressed air directly flows into the second pressure regulator 33, whereas in the screw driving machine 2, the third air passage 10d is connected via the pilot valve control passage 10f. It communicates with the pilot valve 70.

  The pilot valve 70 opens and closes according to the pressure of air in the pilot valve control passage 10f, and when the pressure of the air in the pilot valve control passage 10f is high (when compressed air is supplied to the third air passage 10d) ), The pressure accumulation chamber 52 is communicated with one end of the fifth air passage 10g. The other end of the fifth air passage 10g communicates with the input side (the valve chamber 332A in FIG. 2) of the second pressure regulator 33 provided adjacent to the upper portion of the air motor 21. The output side (piston chamber 331 </ b> A side in FIG. 2) of the second pressure regulator 33 is directly connected to the air motor 21.

  Therefore, in this screw driving machine 2, the compressed air in the third air passage 10d used for the driving operation is used only for the opening / closing operation of the pilot valve 70, and this compressed air directly drives the air motor 21. Never do. The air motor 21 is driven by compressed air in the pressure accumulating chamber 52 connected via the second pressure regulator 33, the fifth air passage 10 g and the pilot valve 70. Even in this configuration, the air motor 21 is driven by the compressed air adjusted to the second set pressure by the second pressure regulator 33. Also in this case, since the pressure of the compressed air in the pressure accumulating chamber 52 is adjusted to the first set pressure by the first pressure regulator 53, the second set pressure ≦ the first set pressure.

  Even in this configuration, as described above, the pressure of the compressed air used for the driving operation and the pressure of the compressed air used for the tightening operation can be set to different values. However, in the screwing machine 2, the compressed air path from the pressure accumulating chamber 52 (air plug 51) to the air motor 21 in the tightening operation is greatly different from that of the screwing machine 1. This path length in the screwdriver 2 is significantly shorter than this path length in the screwdriver 1. For example, when the first set pressure is low, the flow rate of the compressed air is slow, and therefore the start timing of the tightening operation may be delayed. However, in this screwing machine 2, this path length becomes short. Therefore, this delay can be reduced. That is, the controllability of the start timing of the tightening operation is enhanced by the above configuration.

  In the screwing machine 2, the second pressure regulator 33 is provided on the handle 50 side near the upper surface of the housing 10. At this time, a pressure regulator capable of switching the set pressure (second set pressure) by operating the knob as described in Patent Document 1 is used as the second pressure regulator, as in the screw driver 1 described above. be able to. In this case, the knob can be provided on the handle 50 side of the upper surface of the housing 10, and the operator can easily operate the knob during the operation. That is, the operator can easily switch the force in the tightening operation during the work.

  In the screw driving machine (driving machine) 3 as the second modified example, the flow of compressed air for controlling the pilot valve 70 is the same as that of the screw driving machine 2 described above, but for driving the air motor 21. The path of the compressed air differs greatly. FIG. 7 is a view showing the configuration of the screw driving machine 3 corresponding to FIGS. Also in this screwing machine 3, the start of the tightening operation is controlled by the pilot valve 70.

  In the screwing machine 3, a branch chamber 55 directly connected to the air plug 51 is provided at the rear end portion of the handle 50, and the branch chamber 55 and the pressure accumulation chamber 52 are connected via a first pressure regulator 53. . For this reason, the pressure of the compressed air in the pressure accumulating chamber 52 becomes the first set pressure, and this compressed air is used for the driving operation similarly to the screw driving machines 1 and 2 described above. On the other hand, the pilot valve 70 similar to the above is connected to the branch chamber 55 via the branch passage 10h instead of being connected to the pressure accumulating chamber 52 in the screw driving machine 2. The compressed air supplied to the pilot valve 70 via the branch path 10h is supplied to the air motor 21 via the fifth air passage 10g and the second pressure regulator 33 when the pilot valve 70 is opened. By this, the tightening operation is performed. The pilot valve 70 is the same as the screwdriver 2 in that the compressed air is introduced into the third air passage 10d (the driving operation is completed) and the pilot valve 70 changes from the closed state to the open state. In FIG. 7, the branch path 10 h is shown separated from the handle 50 and the housing 10, but the branch path 10 h is actually set from the handle 50 to the inside of the housing 10.

  Also in the screw driving machine 3, the compressed air used for the driving operation is the compressed air in the pressure accumulating chamber 52, and the pressure thereof is the first set pressure set by the first pressure regulator 53. On the other hand, the point that the pressure of the compressed air used for the tightening operation is set to the second set pressure by the second pressure regulator 33 is the same as that of the screwing machines 1 and 2, but the second pressure regulator Since the compressed air in the branch chamber 55 before being depressurized by the first pressure regulator 53 is input to 33, the second set pressure can be set independently of the first set pressure. For this reason, it is also possible to set it as 2nd setting pressure> 1st setting pressure, for example. In this case, the force in the driving operation can be made very weak, while the force in the tightening operation can be made very strong. Further, since the path length of the compressed air from the branch chamber 55 (air plug 51) to the air motor 21 when performing the tightening operation is shortened, the controllability of the start timing of the tightening operation is improved. This is the same as the screwing machine 2 in FIG.

  For this reason, in this screwing machine 3, the controllability of the start timing of the tightening operation is enhanced, and the force in each of the driving operation and the tightening operation can be individually adjusted, and the degree of freedom of adjustment is increased. Especially high. In addition, when a switch capable of switching the set pressure (second set pressure) is used as the second pressure regulator, the above-described screw driving can also be performed particularly easily. Similar to machine 2.

  In addition to the above configuration, the first pressure adjusting means for controlling the force in the driving operation and the second pressure adjusting means for controlling the force in the tightening operation are provided at different locations in the screw driving machine (driving machine). Can be installed. Further, as the first pressure adjusting means and the second pressure adjusting means, those other than the above configuration can be used as appropriate. In addition, even if the mechanism for performing the driving operation and the tightening operation is different, as long as compressed air supplied from the outside is used as a power source for performing these operations, as described above It is obvious that the configuration in which the first pressure adjusting means and the second pressure adjusting means are provided independently is effective.

1, 2, 3 Screwing machine
10 Housing 10a First air passage 10b Second air passage 10c Return air chamber 10d Third air passage (tightening operation control air passage)
10e Fourth air passage 10f Pilot valve control passage 10g Fifth air passage 10h Branch passage 11 Driver bit 12 Injection portion 13 Push lever 14 Trigger lever 15 Operation valve 20 Spindle 20b Cylinder intake port 20c Cylinder exhaust port 21 Air motor 22 Planetary gear mechanism 23 Slider (piston)
23A Air blocking surface 24 Sub piston part (piston)
25 Main piston part (piston)
26 Main valve 30 Cylinder 30a Cylinder chamber 30b Compressed air outflow hole 30c Compressed air inflow hole 31 Plate portion 31a Vent hole 32 Bumper 33 Second pressure regulator (second pressure adjustment means)
50 Handle 51 Air plug 51a Cap 52 Accumulation chamber 53 First pressure regulator (first pressure regulating means)
54 Exhaust passage 55 Branch chamber 60 Magazine 61 Screw feed portion 70 Pilot valve 331 Case 331A Piston chamber 331B Spring chamber 332 Cap 332A Valve chamber 333 Separator 333A Through hole 334, 337 Spring 335 Valve body 336 Piston 336A Piston shaft portion P Screw (stop) Ingredients)
S Fastened member

Claims (8)

A driving machine that performs a driving operation for driving a stopper member into a member to be fastened along a driving direction and a tightening operation for rotating and tightening the stopper member using compressed air supplied from the outside as a power source. And
First pressure adjusting means for adjusting the pressure of compressed air used for the driving operation;
Second pressure adjusting means that adjusts the pressure of the compressed air used for the tightening operation and is separate from the first pressure adjusting means;
A driving machine characterized by comprising: A driver bit that performs the driving operation and the tightening operation by abutting the stopper member;
A piston that is mounted with the driver bit, moves along the driving direction during the driving operation, and rotates around the driving direction during the driving operation;
A spindle in which the piston is housed;
An air motor that rotates the piston by being supplied with compressed air;
Comprising
Performing the driving action by introducing compressed air into the spindle;
2. The driving machine according to claim 1, wherein the tightening operation is performed by supplying compressed air to the air motor after the driving operation.   It is a path through which compressed air introduced into the spindle during the driving operation is discharged after the driving operation, and includes a tightening operation control air passage provided outside the spindle. The driving machine according to claim 2. A pressure accumulating chamber for storing compressed air supplied from the outside and adjusted in pressure by the first pressure adjusting means;
4. The driving machine according to claim 3, wherein the driving operation is performed by introducing compressed air in the pressure accumulating chamber into the spindle.   The compressed air in the air passage for tightening operation control is supplied to the second pressure adjusting unit, and the compressed air whose pressure is adjusted by the second pressure adjusting unit is supplied to the air motor to perform the tightening operation. The driving machine according to claim 4, wherein the driving machine is performed.   5. The pilot valve according to claim 4, further comprising: a pilot valve configured to perform the tightening operation by supplying compressed air to the air motor when the air pressure in the air passage for tightening operation control is high. Machine.   The tightening operation is performed by supplying compressed air from the pressure accumulating chamber to the second pressure adjusting means via the pilot valve and supplying compressed air whose pressure is adjusted by the second pressure adjusting means to the air motor. The driving machine according to claim 6, wherein the driving machine is performed.   Compressed air supplied from outside without passing through the accumulator chamber is supplied to the second pressure adjusting means via the pilot valve, and compressed air whose pressure is adjusted by the second pressure adjusting means is supplied to the air motor. 7. The driving machine according to claim 6, wherein the tightening operation is performed.

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