JP2020146821A - Driving machine - Google Patents

Abstract

To provide a driving machine capable of preventing a striking part from operating in a first direction without the intention of a user.SOLUTION: Provided is a driving machine 10 including: a trigger 14 to/from which operation force is added/removed; a push lever 15 capable of contacting and separating from an opposite material W1; a striking part 13 capable of operating in a first direction C1 for striking a nail 52 to be hammered into the opposite material W1, and a second direction C2 that is reverse to the first direction C1; and a piston upper chamber 29 which is supplied with gas when the push lever 15 contacts the opposite material W1 in a state that operation force is added to the trigger 14, and which operates the striking part 13 in the first direction C1 according to pressure of the gas. The striking part 13 strikes the nail 52, and when the push lever 15 contacts the opposite material W1 within a predetermined time from a point of time at which the push lever 15 separates from the opposite material W1, a stopper 75 is provided for preventing gas from being supplied to the piston upper chamber 29.SELECTED DRAWING: Figure 1

Description

The present invention relates to a driving machine including an operating member to which an operating force is added and released, a contact member capable of contacting and separating from a mating material, and a striking portion capable of operating in a direction of striking a fastener. ..

An example of a driving machine including an operating member to which an operating force is added and released, a contact member capable of contacting and separating from a mating material, and a striking portion that can operate in a direction of striking a fastener is patented. It is described in Document 1. The driving machine described in Patent Document 1 includes a housing, a cylinder, a valve, a pressure chamber, an exhaust valve chamber, an exhaust valve, an auxiliary pressure chamber, an accumulator chamber, a striking part, a trigger as an operating member, and a push lever as a contact member. It has a return air chamber, an injection part, and a magazine. Further, a mechanism for transmitting the operating force of the trigger and the push lever to the valve is provided. The magazine houses the fasteners, which are supplied to the injection section.

When the user releases the operating force on the trigger and push lever, the valve retains its initial state. The valve in the initial state connects the accumulator chamber and the auxiliary pressure chamber, and also connects the accumulator chamber and the exhaust valve chamber. Therefore, the cylinder is pressed against the valve seat and stops, and the cylinder shuts off the accumulator chamber and the pressure chamber. Further, the exhaust valve connects the outside of the housing to the pressure chamber. Therefore, the striking portion stops at top dead center in contact with the valve seat.

When the user applies an operating force to the trigger and presses the push lever against the mating material, the valve switches from the initial state to the operating state. The operating valve shuts off the accumulator chamber and the auxiliary pressure chamber, and also shuts off the accumulator chamber and the exhaust valve chamber. Therefore, the cylinder is pressed against the valve seat and stops, and the cylinder connects the accumulator chamber and the pressure chamber. The exhaust valve also shuts off the outside of the housing from the pressure chamber. Then, the compressed air in the accumulator chamber is supplied to the pressure chamber, the striking portion operates in the first direction from the top dead center, and the striking portion strikes the fastener.

When the user separates the push lever from the mating material and releases the operating force on the trigger, the valve returns from the operating state to the initial state. The striking part operates in the second direction by the pressure of the lower chamber of the piston, and the striking part stops at the top dead center.

Japanese Unexamined Patent Publication No. 2015-58486

According to the inventor of the present application, after the striking portion is operated in the first direction, the contact member is separated from the mating material in a state where the operating force is applied to the operating member, and the contact portion is operated unintentionally by the user. Then, he recognized the problem that the striking portion operates in the first direction.

An object of the present invention is to provide a driving machine capable of suppressing the striking portion from operating in the first direction unintentionally by the user.

In the present invention, the operating member to which the operating force is added and released, the contact member capable of contacting and separating from the mating material, and the first direction for striking the fastener to be driven into the mating material, which is opposite to the first direction. When the striking portion that can be operated in the second direction and the contact member come into contact with the mating material while the operating force is applied to the operating member, gas is supplied and the striking portion is pressed by the pressure of the gas. A driving machine provided with a pressure chamber that operates in one direction, and the contact member is within a predetermined time from the time when the contact member is separated from the mating material after the striking portion hits the fastener. A blocking mechanism is provided to prevent the gas from being supplied to the pressure chamber when the gas comes into contact with the mating material.

According to the present invention, it is possible to prevent the striking portion from operating in the first direction unintentionally by the user.

It is an overall sectional view of the driving machine of this invention. It is sectional drawing of the sleeve valve and the cylinder provided in the driving machine of FIG. It is sectional drawing of the trigger valve, the cylinder and the return chamber provided in the driving machine of FIG. It is sectional drawing of the state in which the stopper provided in the driving machine of FIG. 1 is stopped at a standby position, and the trigger is stopped at an initial position. FIG. 5 is a cross-sectional view of a state in which the stopper is stopped at the standby position and an operating force is applied to the trigger. FIG. 5 is a cross-sectional view in which the stopper is stopped at the standby position and the trigger valve is in the operating state. FIG. 5 is a cross-sectional view in which the stopper is operated from the standby position and the trigger valve is in the operating state. FIG. 5 is a cross-sectional view in which the stopper is stopped at the blocking position and the trigger valve is in the initial state. FIG. 5 is a cross-sectional view of a state in which the stopper is stopped at the blocking position and an operating force is applied to the trigger. It is another example of the stopper provided in the driving machine of FIG. 1, and is the cross-sectional view of the state where the trigger is stopped at the initial position. FIG. 10 is a cross-sectional view of a state in which the stopper shown in FIG. 10 is stopped at a standby position and an operating force is applied to the trigger. FIG. 10 is a cross-sectional view of a state in which the stopper shown in FIG. 10 is stopped at a blocking position and an operating force is applied to the trigger. This is an example of a time chart showing the state of the driving machine.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The driving machine 10 shown in FIG. 1 includes a housing 11, an injection unit 12, a striking unit 13, a trigger 14, a push lever 15, and a trigger valve 16. The housing 11 has a tubular body 17, a handle 18 connected to the body 17, and a head cover 19 that closes the opening of the body 17. The injection portion 12 is fixed to the body 17. Further, the magazine 20 is supported by the injection portion 12 and the handle 18. The trigger valve 16 is provided at a connection point between the body 17 and the handle 18.

The accumulator chamber 21 is formed in the body 17, the handle 18, and the head cover 19. The accumulator chamber 21 is a space for accommodating a gas. Further, a plug is provided at the end of the handle 18. When the air hose is connected to the plug, compressed air as a gas is supplied to the accumulator chamber 21 through the air hose.

As shown in FIG. 2, the cylinder 22 and the cylindrical sleeve valve 23 are arranged in the housing 11. The cylinder 22 and the sleeve valve 23 are arranged concentrically with the center line A1 as the center. The center line A1 is the center of the cylinder 22. The cylinder 22 is supported so as not to move in the housing 11. The sleeve valve 23 is arranged outside the cylinder 22 in the radial direction of the cylinder 22. The sleeve valve 23 can operate in the direction along the center line A1 with respect to the cylinder 22. A seal member 81 is attached to the outer peripheral surface of the sleeve valve 23.

A part of the striking portion 13 is arranged in the cylinder 22, and the striking portion 13 can operate in the direction along the center line A1 with respect to the cylinder 22. The striking portion 13 has a piston 24 and a driver blade 25, and is attached to the outer peripheral surface of the seal member 26 piston 24. The seal member 26 comes into contact with the inner surface of the cylinder 22.

The upper cover 27 is fixed to the inside of the head cover 19. A stopper 28 is provided between the upper cover 27 and the cylinder 22. The stopper 28 is made of synthetic rubber. A piston upper chamber 29 is formed between the stopper 28 and the piston 24. A sleeve valve chamber 31 is formed inside the housing 11 and outside the cylinder 22. A passage 32 is provided in the housing 11, and the sleeve valve chamber 31 is connected to the passage 32. The spring 30 is provided in the sleeve valve chamber 31.

The sleeve valve 23 is urged in a direction approaching the upper cover 27 by the urging force of the spring 30 and the urging force according to the air pressure of the sleeve valve chamber 31. Further, the sleeve valve 23 is urged in a direction away from the upper cover 27 by an urging force corresponding to the pressure of the accumulator chamber 21. A space 33 is formed between the sleeve valve 23 and the cylinder 22. The sleeve valve 23 has a passage 90. The passage 90 connects the space 33 and the outer B1 of the housing 11.

As shown in FIG. 3, a bumper 34 is provided in the housing 11. The bumper 34 is made of synthetic rubber. The bumper 34 has a shaft hole 35, and a part of the bumper 34 is arranged in the cylinder 22. The bumper 34 is supported by the injection portion 12. The driver blade 25 can move in the shaft hole 35 in the direction along the center line A1. In the cylinder 22, a piston lower chamber 36 is formed between the piston 24 and the bumper 34.

A return chamber 37 is formed in the body 17 and outside in the radial direction of the cylinder 22. A partition wall 38 is provided in the body 17, and the partition wall 38 positions the cylinder 22 in the radial direction. Further, the partition wall 38 separates the accumulator chamber 21 and the return chamber 37. Passages 39 and 40 that penetrate the cylinder 22 in the radial direction are provided. The passage 40 connects the piston lower chamber 36 and the return chamber 37 regardless of the position of the piston 24 in the direction along the center line A1.

A check valve 41 is attached to the outer surface of the cylinder 22. The check valve 41 is made of synthetic rubber and has an annular shape. The check valve 41 operates by the air pressure in the cylinder 22 to open the passage 39. The check valve 41 closes the passage 39 by the air pressure or contraction force of the return chamber 37. When the check valve 41 opens the passage 39, the air in the cylinder 22 can flow out to the return chamber 37 through the passage 39. When the check valve 41 closes the passage 39, the air in the return chamber 37 cannot flow into the cylinder 22 from the passage 39.

The injection portion 12 has a base portion 42 and a tubular portion 43, and the base portion 42 is fixed to the body 17. The base portion 42 has a shaft hole 44. The tubular portion 43 is connected to the base portion 42, and the tubular portion 43 projects from the base portion 42 in the direction along the center line A1. The tubular portion 43 has an injection path 45. The driver blade 25 can move in the shaft hole 44 and the injection path 45 in the direction along the center line A1.

The push lever 15 is attached to the injection portion 12. The push lever 15 can be operated in the direction along the center line A1 with respect to the injection portion 12. The guide portion 46 and the holder 47 are provided on the outer surface of the housing 11, for example, the body 17. The guide portion 46 and the holder 47 are arranged between the trigger valve 16 and the injection portion 12 in the direction along the center line A1. The holder 47 has a tubular shape, and the holder 47 movably supports the transmission member 48.

The guide portion 46 movably supports the contact shaft 49. The contact shaft 49 is connected to the transmission member 48. The contact shaft 49 and the transmission member 48 can move in the direction along the center line A2 together with the push lever 15. The center line A2 is parallel to the center line A1. The guide portion 46 has a stopper 56. The contact shaft 49 has a plate 50. The spring 51 is arranged between the guide portion 46 and the plate 50. The spring 51 urges the transmission member 48 in a direction that separates it from the trigger valve 16. The push lever 15 and the contact shaft 49 stop at the initial positions when the plate 50 is pressed against the holder 47.

The magazine 20 accommodates the nail 52. A plurality of nails 52 are housed in the magazine 20 in a state of being connected to each other and arranged in a spiral shape. A feed mechanism 53 is provided in the magazine 20, and the feed mechanism 53 feeds the nail 52 in the magazine 20 to the injection path 45.

As shown in FIG. 4, the trigger 14 is attached to the housing 11, the body 17 as an example. The trigger 14 can be operated around the support shaft 54. A spring 55 is provided outside the body 17, which urges the trigger 14 clockwise in FIG. The trigger 14 urged by the spring 55 stops at the initial position in contact with the guide portion 46. A trigger arm 57 is attached to the trigger 14. The trigger arm 57 can be operated around the support shaft 58. A spring 59 is provided. The spring 59 urges the trigger arm 57 counterclockwise in FIG. The trigger arm 57 urged by the spring 59 comes into contact with the stopper 56 and stops at the initial position.

The trigger valve 16 has an accommodating portion 68, a plunger 60, a first bush 61, a second bush 62, a valve body 63, and a spring 73. The accommodating portion 68 is a casing formed by the housing 11. The first bush 61 and the second bush 62 are provided in the accommodating portion 68. Both the first bush 61 and the second bush 62 have a tubular shape. The first bush 61 and the second bush 62 are arranged concentrically with the center line A3 as the center. The center line A3 is parallel to the center line A2. The valve body 63 has a tubular shape, and the valve body 63 is arranged in the first bush 61 and in the second bush 62. The valve body 63 can operate with respect to the first bush 61 and the second bush 62 along the center line A3. The valve body 63 has a protrusion 82. The protrusion 82 protrudes from the valve body 63 in a direction approaching the trigger 14.

An air chamber 64 is formed between the valve body 63 and the second bush 62 in the second bush 62. The second bush 62 has a passage 65, and the accommodating portion 68 has a passage 66. The second bush 62 has a shaft hole 67, and a part of the plunger 60 is arranged in the shaft hole 67. The accumulator chamber 21 is connected to the accumulator chamber 21 by a passage 65, a passage 66, and a shaft hole 67.

The second bush 62 has a passage 69. An air chamber 80 is formed between the first bush 61 and the valve body 63 in the second bush 62. Further, an air chamber 70 is formed between the first bush 61 and the valve body 63. The accumulator chamber 21 is connected to the air chamber 70 by the passage 66, the passage 69, and the air chamber 80. The first bush 61 has a passage 71, and the air chamber 70 is always connected to the passage 32 by the passage 71.

The plunger 60 is arranged in the valve body 63 and in the shaft hole 67. The plunger 60 can operate with respect to the valve body 63 and the second bush 62 along the center line A3. The plunger 60 has a flange 72, and the spring 73 is provided in the valve body 63. The spring 73 is pressed against the flange 72 and the valve body 63. The valve body 63 is urged by the spring 73 in a direction away from the trigger 14. The plunger 60 is urged by the spring 73 in a direction approaching the trigger 14. An exhaust chamber 74 is formed in the accommodating portion 68 and in the valve body 63. A passage 84 is provided in the housing 11, and the passage 84 connects the exhaust chamber 74 and the external B1.

The stopper 75 is attached to the housing 11, the body 17 as an example. The stopper 75 is an element that prevents the valve body 63 from operating in the direction along the center line A3. The stopper 75 can be operated in a direction intersecting the center line A3. A sleeve 76 is provided on the body 17. A shaft hole 77 is provided in the second bush 62.

The stopper 75 is a shaft and is arranged in the sleeve 76 and the shaft hole 77. The stopper 75 can enter the second bush 62 through the shaft hole 77, and can enter and exit the operating range of the valve body 63. A spring 78 is provided outside the body 17. The spring 78 is made of metal as an example. The stopper 75 is urged toward the outside of the second bush 62 by the urging force of the spring 78. The stopper 75 has a flange 79, and the flange 79 is pressed against the sleeve 76 to stop the stopper 75. The end portion of the stopper 75 in the operating direction is arranged in the return chamber 37. The stopper 75 is urged into the second bush 62 against the urging force of the spring 78 by the air pressure of the return chamber 37.

The user can select the first mode and the second mode as the usage pattern of the driving machine 10. In the first mode, the operation of pressing the push lever 15 against the mating material W1 and the operation of separating the push lever 15 from the mating material W1 are alternately repeated with the operating force applied to the trigger 14, and the striking portion 13 is pressed. It is a continuous striking mode that operates reciprocating.

In the second mode, after pressing the push lever 15 against the mating material W1, an operating force is applied to the trigger 14 to operate the striking portion 13 from the top dead center, and then the push lever 15 is separated from the mating material W1. In addition, it is a single-shot mode in which the operating force on the trigger 14 is released.

Here, an example in which the user selects the first mode will be described. First, when the user separates the push lever 15 from the mating material W1, the plate 50 is pressed against the holder 47, and the contact shaft 49 and the push lever 15 are stopped at the initial positions. The contact shaft 49 stopped at the initial position is separated from the trigger arm 57. Further, when the user releases the operating force on the trigger 14, the trigger 14 is stopped at the initial position in contact with the guide portion 46. Then, the trigger arm 57 is stopped at the initial position in contact with the stopper 56 as shown in FIG.

The trigger arm 57 stopped at the initial position is separated from the plunger 60. The plunger 60 urged by the spring 73 is stopped at the initial position where the flange 72 is pressed against the second bush 62. When the plunger 60 is stopped at the initial position, the accumulator chamber 21 is connected to the air chamber 64 by the passage 65 and the shaft hole 67. Further, the plunger 60 stopped at the initial position shuts off the air chamber 64 and the exhaust chamber 74. Further, the valve body 63 urged by the spring 73 is stopped at the initial position pressed against the first bush 61. When the valve body 63 is stopped at the initial position, the accumulator chamber 21 is connected to the passage 71 by the passage 69, the air chamber 80 and the air chamber 70. Further, the valve body 63 shuts off the exhaust chamber 74 and the air chamber 70.

As described above, the state in which the plunger 60 is stopped at the initial position and the valve body 63 is stopped at the initial position is the initial state of the trigger valve 16. When the trigger valve 16 is in the initial state, the compressed air in the accumulator chamber 21 is supplied to the sleeve valve chamber 31 through the passage 69, the air chambers 80 and 70, the passage 71 and the passage 90.

As shown in FIG. 2, the sleeve valve 23 is stopped at the initial position where it is pressed against the upper cover 27 by the urging force of the spring 30. The sleeve valve 23 stopped at the initial position shuts off the accumulator chamber 21 and the piston upper chamber 29. Further, the sleeve valve 23 is separated from the seal member 81, and the piston upper chamber 29 is connected to the external B1 by the space 33 and the passage 90. The state in which the sleeve valve 23 is stopped at the initial position is the initial state of the sleeve valve 23. When the sleeve valve 23 is in the initial state, the piston upper chamber 29 is at atmospheric pressure. Further, the piston 24 comes into contact with the stopper 28 as shown in FIG. 2, and the striking portion 13 is caused by the engaging force between the seal member 26 and the inner surface of the cylinder 22 or the frictional force between the seal member 26 and the inner surface of the cylinder 22. Has stopped at top dead center.

Further, a part of the driver blade 25 is located in the shaft hole 44. The piston lower chamber 36 is connected to the outer surface B1 by a gap between the outer surface of the driver blade 25 and the inner surface of the shaft hole 44. That is, the piston lower chamber 36 and the return chamber 37 have substantially atmospheric pressure. Further, the stopper 75 is stopped at a standby position where the flange 79 comes into contact with the sleeve 76 as shown in FIG. The tip of the stopper 75 stopped at the standby position is located outside the operating range of the valve body 63.

When the user applies an operating force to the trigger 14, the trigger 14 operates counterclockwise in FIG. 4, and the trigger 14 stops at an operating position in contact with the second bush 62 as shown in FIG. Further, since the push lever 15 is separated from the mating material W1, the contact shaft 49 stops at the initial position, and the trigger valve 16 holds the initial state. Further, the stopper 75 is stopped at the standby position.

When the user presses the push lever 15 against the mating material W1 with the operating force applied to the trigger 14, the push lever 15 operates in a direction approaching the bumper 34. The operating force of the push lever 15 is transmitted to the contact shaft 49 via the transmission member 48, and the contact shaft 49 operates in a direction approaching the trigger valve 16 against the urging force of the spring 51. When the plate 50 comes into contact with the guide portion 46, the contact shaft 49 stops at the operating position and the push lever 15 stops at the operating position.

While the contact shaft 49 is operating from the initial position to the operating position, the contact shaft 49 is pressed against the trigger arm 57. The trigger arm 57 operates clockwise in FIG. 4, and the trigger arm 57 is pressed against the plunger 60 as shown in FIG. The plunger 60 operates against the urging force of the spring 73 from the initial position. When the trigger arm 57 stops, the plunger 60 stops at the operating position.

When the plunger 60 is stopped at the operating position, the air chamber 64 and the passage 65 are cut off, and the air chamber 64 is connected to the external B1 by the exhaust chamber 74. Further, the air chamber 70 and the air chamber 80 are shut off. Therefore, the valve body 63 operates in a direction approaching the trigger 14 against the urging force of the spring 73 by the air pressure of the air chamber 80, and the valve body 63 stops at the operating position in contact with the second bush 62. In this way, when the valve body 63 stops at the operating position, that is, when the trigger valve 16 stops in the operating state, the air chamber 70 and the exhaust chamber 74 are connected. Therefore, the air in the sleeve valve chamber 31 is discharged to the outside B1 through the passage 32, the passage 71, and the exhaust chamber 74.

Then, the sleeve valve 23 operates in a direction away from the upper cover 27 by the air pressure of the accumulator chamber 21, and the sleeve valve 23 stops at the operating position. The sleeve valve 23 stopped at the operating position is pressed against the seal member 81 and shuts off the piston upper chamber 29 and the external B1. Further, the piston upper chamber 29 and the accumulator chamber 21 are connected, and the air pressure in the piston upper chamber 29 rises. Therefore, the striking portion 13 operates in the first direction C1 from the top dead center by the air pressure of the piston upper chamber 29, that is, descends. When the striking portion 13 descends, the driver blade 25 strikes the nail 52 of the injection path 45, and the nail 52 is driven into the mating material W1.

When the sealing member 26 is located between the passage 39 and the bumper 34 while the striking portion 13 is descending, the check valve 41 opens the passage 39 due to the air pressure of the piston upper chamber 29, and the air in the piston upper chamber 29 is released. , Passes through the passage 39 and flows into the return chamber 37. The air pressure in the return chamber 37 rises.

Then, when the air pressure in the piston upper chamber 29 and the air pressure in the return chamber 37 become equal, the air in the piston upper chamber 29 does not flow into the return chamber 37. Further, the check valve 41 closes the passage 39, and the check valve 41 prevents the air in the return chamber 37 from flowing back into the piston upper chamber 29.

Further, after the nail 52 is completely driven into the mating material W1, the piston 24 collides with the bumper 34 as shown by the alternate long and short dash line in FIG. The bumper 34 absorbs the kinetic energy of the striking portion 13, and the striking portion 13 stops. The state in which the piston 24 is in contact with the bumper 34 is the bottom dead center of the striking portion 13. When the striking portion 13 stops at bottom dead center, the piston 24 closes the shaft hole 35. Therefore, the air pressure of the return chamber 37 and the piston lower chamber 36 is maintained substantially the same as the air pressure of the accumulator chamber 21. In the process of increasing the air pressure in the return chamber 37, the stopper 75 operates from the standby position against the urging force of the spring 78. As shown in FIG. 7, the stopper 75 stops at an intermediate position in contact with the protrusion 82.

When the push lever 15 is separated from the mating material W1 by the reaction of driving the nail 52 into the mating material W1 or by the operation of the user while the operating force is applied to the trigger 14, the push lever 15 and the contact shaft 49 move. , It operates from the operating position by the urging force of the spring 51. When the plate 50 comes into contact with the holder 47, the push lever 15 and the contact shaft 49 stop at their initial positions. In the process of operating the contact shaft 49 from the operating position to the initial position, the trigger arm 57 operates counterclockwise in FIG. 7 by the urging force of the spring 59 and stops.

Therefore, the plunger 60 operates from the operating position to the initial position and stops. Then, the air chamber 64 is connected to the accumulator chamber 21 by the passage 65. Further, the air chamber 64 and the exhaust chamber 74 are shut off. As a result, the valve body 63 operates from the operating position to the initial position by the air pressure of the accumulator chamber 21, and the valve body 63 stops at the initial position shown in FIG. In this way, the trigger valve 16 switches from the operating state to the initial state.

Further, when the valve body 63 moves from the operating position to the initial position, the stopper 75 operates in a direction approaching the plunger 60 by the air pressure of the return chamber 37, and the tip of the stopper 75 contacts the second bush 62 as shown in FIG. The stopper 75 stops at the blocking position. A part of the stopper 75 stopped at the blocking position is located in the operating range of the protrusion 82.

On the other hand, the trigger valve 16 in the initial state connects the passage 32 and the accumulator chamber 21 and shuts off the passage 32 and the exhaust chamber 74. Therefore, the sleeve valve 23 operates in a direction approaching the upper cover 27, and stops at the initial position where the sleeve valve 23 comes into contact with the upper cover 27. That is, the sleeve valve 23 switches from the operating state to the initial state. Therefore, the air pressure in the piston upper chamber 29 decreases, and the air pressure in the piston upper chamber 29 becomes substantially the same as the atmospheric pressure. Then, the striking portion 13 operates in the second direction C2 from the bottom dead center to the top dead center by the air pressure of the piston lower chamber 36, that is, rises, and the striking portion 13 stops at the top dead center.

When the striking portion 13 starts to rise from the bottom dead center, the piston 24 is separated from the bumper 34, and the air in the return chamber 37 is the gap between the piston lower chamber 36, the shaft hole 35 and the driver blade 25 and the inner surface of the shaft hole 44. It is discharged to the outside B1 through the passage. Therefore, the air pressure in the return chamber 37 decreases. After the striking portion 13 stops at top dead center, the air pressure in the return chamber 37 becomes substantially the same as the atmospheric pressure. When the air pressure in the return chamber 37 drops, the stopper 75 operates from the blocking position to the standby position by the urging force of the spring 78, and the stopper 75 stops at the standby position shown in FIG. That is, all of the stoppers 75 are located outside the operating range of the protrusions 82. The time at which the stopper 75 stops at the standby position may be either after the time when the striking portion 13 reaches the top dead center or at the same time as the time when the striking portion 13 reaches the top dead center.

After that, with the operating force applied to the trigger 14, the operation of bringing the push lever 15 into contact with the mating material W1 and the operation of separating the push lever 15 from the mating material W1 are repeated, and the plurality of nails 52 are sequentially moved to the mating material W1. It is possible to drive into W1.

On the other hand, within a predetermined time from the time when the push lever 15 is separated from the mating material W1, the stopper 75 is stopped at the blocking position shown in FIG. That is, a part of the stopper 75 is located in the operating range of the protrusion 82. Then, the case where the push lever 15 comes into contact with the mating material W1 again within a predetermined time from the time when the push lever 15 is separated from the mating material W1 will be described.

In this case, the contact shaft 49 operates from the initial position shown in FIG. 8 to the moving position, and the contact shaft 49 stops at the operating position shown in FIG. The operating force of the contact shaft 49 moves the plunger 60 from the initial position to the operating position, and the plunger 60 stops at the operating position. Then, the valve body 63 receives an urging force from the initial position to the operating position by the pressure of the air chamber 80. However, the stopper 75 engages the protrusion 82. That is, the stopper 75 prevents the valve body 63 from operating from the initial position to the operating position.

As described above, even if the push lever 15 comes into contact with the mating material W1 again within a predetermined time from the time when the push lever 15 is separated from the mating material W1, the compressed air is not supplied to the piston upper chamber 29. The predetermined time means, for example, the time from the time when the push lever 15 is separated from the mating material W1 until the stopper 75 returns to the standby position and stops. That is, before the striking portion 13 reaches the top dead center, the operating direction of the striking portion 13 is switched and the striking portion 13 does not operate toward the bottom dead center. Therefore, it is possible to prevent the striking portion 13 from descending against the intention of the user. For example, it is possible to prevent another nail 52 from being driven onto the nail 52 driven into the mating material W1. In other words, when the push lever 15 comes into contact with the mating material W1 after a predetermined time has passed from the time when the push lever 15 is separated from the mating material W1, the striking portion 13 operates from the top dead center to the bottom dead center. ..

Next, an example in which the user selects the second mode will be described. When the user presses the push lever 15 against the mating material W1, the contact shaft 49 operates from the initial position to the operating position and stops. Since the operating force on the trigger 14 is released, the operating force of the contact shaft 49 is not transmitted to the plunger 60, and the trigger valve 16 holds the initial state.

When an operating force is applied to the trigger 14 while the push lever 15 is pressed against the mating material W1, the trigger arm 57 operates with the tip of the contact shaft 49 as a fulcrum. The operating force of the trigger arm 57 is transmitted to the plunger 60, and the trigger valve 16 switches from the initial state shown in FIG. 4 to the operating state shown in FIG. Therefore, the striking portion 13 operates from the top dead center to the bottom dead center. The driver blade 25 drives the nail 52 into the mating material W1.

When the user selects the second mode, the stopper 75 operates in the same manner as when the user selects the first mode. However, when the user selects the second mode and the push lever 15 is separated from the mating material W1 while the operating force is applied to the trigger 14, the trigger arm 57 moves out of the operating range of the contact shaft 49. ..

Here, even if the push lever 15 comes into contact with the mating material W1 again, the contact shaft 49 does not transmit the operating force to the trigger arm 57. That is, the trigger valve 16 is held in the initial state, and the striking portion 13 is stopped at the top dead center. Therefore, in order to operate the striking portion 13 from the top dead center, it is necessary to release the operating force of the trigger 14 once and apply the operating force to the trigger 14 again. That is, a certain time interval occurs between the time when the operating force is applied to the trigger 14 last time and the time when the operating force is applied to the trigger 14 this time. Therefore, when the user selects the second mode, the stopper 75 operates from the standby position each time the striking portion 13 strikes the nail 52, but the stopper 75 does not block the operation of the valve body 63.

Next, when the push lever 15 is pressed against the mating material W1 within a predetermined time from the time when the push lever 15 is separated from the mating material W1, the striking portion 13 is prevented from operating toward the bottom dead center. Other examples of the stopper 75 will be described with reference to FIGS. 10, 11 and 12. Another example of the stopper 75 is provided in the driving machine 10 of FIG. FIG. 10 Another example of the stopper 75 prevents the operating force of the push lever 15 from being transmitted to the plunger 60 of the trigger valve 16.

The stopper 75 is operably provided with respect to the guide portion 46. When the stopper 75 operates in the direction intersecting the center line A3, a part of the stopper 75 enters and exits the operating range of the contact shaft 49. The spring 78 urges the stopper 75 in a direction away from the contact shaft 49. The contact shaft 49 has an engaging portion 83. The valve body 63 does not include the protrusion 82 shown in FIG.

An example will be described in which the user uses the driving machine 10 having the stopper 75 of FIG. 10 and the user selects the first mode. When the user releases the operating force on the trigger 14 and separates the push lever 15 from the mating material W1, the contact shaft 49 and the push lever 15 are stopped at the initial positions. Further, the trigger valve 16 holds the initial state as shown in FIG. Further, the stopper 75 is stopped at the standby position. All of the stoppers 75 stopped at the standby position are located outside the operating range of the contact shaft 49.

Next, the user applies an operating force to the trigger 14 and presses the push lever 15 against the mating material W1. Then, the contact shaft 49 operates from the initial position as shown in FIG. 11, and the operating force of the contact shaft 49 is transmitted to the plunger 60 via the trigger arm 57. Therefore, the trigger valve 16 switches from the initial state to the operating state. Therefore, the striking portion 13 operates from the top dead center to the bottom dead center, and the striking portion 13 drives the nail 52 into the mating material W1. When the striking portion 13 operates from the top dead center to the bottom dead center, the pressure in the return chamber 37 rises. The stopper 75 is urged by the air pressure of the return chamber 37 in a direction in which the stopper 75 is attached to the contact shaft 49 against the urging force of the spring 78. However, since the contact shaft 49 is within the operating range of the stopper 75, the stopper 75 does not move to the blocking position. Further, the striking portion 13 reaches the bottom dead center shown in FIG.

When the push lever 15 is separated from the mating material W1, the contact shaft 49 moves from the operating position to the initial position as shown in FIG. 12, and the contact shaft 49 stops outside the operating range of the stopper 75. Further, the trigger valve 16 is switched from the operating state to the initial state, and the striking portion 13 operates from the bottom dead center to the top dead center. Further, the contact shaft 49 has moved out of the operating range of the stopper 75. Therefore, the stopper 75 operates from the standby position against the urging force of the spring 78 by the air pressure of the return chamber 37. The stopper 75 stops at the blocking position shown in FIG.

A part of the stopper 75 stopped at the blocking position is located within the operating range of the contact shaft 49. When the striking portion 13 operates from the bottom dead center to the top dead center, the piston 24 is separated from the bumper 34, and the air in the return chamber 37 gradually decreases. Therefore, the stopper 75 operates from the blocking position to the operating position. When the push lever 15 is separated from the mating material W1 within a predetermined time, a part of the stopper 75 is located within the operating range of the contact shaft 49. The meaning of the predetermined time is the same as described above.

When the predetermined time exceeds a predetermined time from the time when the push lever 15 is separated from the mating material W1, the stopper 75 returns to the standby position and stops. Therefore, when the push lever 15 is pressed against the mating material W1 after a predetermined time has passed from the time when the push lever 15 is separated from the mating material W1, the contact shaft 49 can be operated from the initial position and the trigger valve 16 is initially operated. It switches from the state to the operating state. Then, the striking portion 13 operates from the top dead center to the bottom dead center. Further, the operation of pressing the push lever 15 against the mating material W1 and the operation of separating the push lever 15 from the mating material W1 are repeated with the user applying an operating force to the trigger 14, and a plurality of nails 52 are sequentially pressed. , It is possible to drive into the mating material W1.

On the other hand, when the push lever 15 comes into contact with the mating material W1 within a predetermined time from the time when the push lever 15 is separated from the mating material W1, the stopper 75 engages with the engaging portion 83. Therefore, the operating force of the contact shaft 49 is not transmitted to the trigger arm 57, or the contact shaft 49 cannot operate from the initial position. That is, the trigger valve 16 is held in the initial state. Therefore, it is possible to avoid driving another nail 52 onto the nail 52 driven into the mating material W1.

Next, an example in which the user selects the second mode when using the driving machine 10 having the stopper 75 of FIG. 10 will be described. When an operating force is applied to the trigger 14 while the push lever 15 is pressed against the mating material W1, the trigger valve 16 switches from the initial state shown in FIG. 10 to the operating state shown in FIG. Therefore, the striking portion 13 operates from the top dead center to the bottom dead center, and the driver blade 25 drives the nail 52 into the mating material W1.

When the user selects the second mode, the stopper 75 operates in the same manner as when the user selects the first mode. The operation of the stopper 75 is different from the operation of the stopper 75 when the user selects the second mode when using the driving machine 10 having the stopper 75 of FIG. That is, if the push lever 15 comes into contact with the mating material W1 within a predetermined time from the time when the push lever 15 is separated from the mating material W1, the stopper 75 blocks the operation of the push lever 15.

However, after the striking portion 13 hits the nail 52 last time, in order for the striking portion 13 to hit the nail 52 this time, the operating force of the trigger 14 must be released once. Therefore, blocking the operation of the push lever 15 does not play a role in preventing unintended driving. Further, when the user selects the second mode, the operation of pressing and separating the push lever 15 against the mating material W1 and the operation of adding and releasing the operating force to the trigger 14 are repeatedly performed. Therefore, even if the stopper 75 blocks the operation of the push lever 15, the work of the user is not hindered.

FIG. 13 is an example of a time chart showing the state of the driving machine 10. FIG. 13 shows the position of the striking portion 13, the position of the stopper 75, the position of the plunger 60, the pressure of the accumulator chamber 21, and the pressure of the return chamber 37. The blocking position and the standby position shown in FIG. 13 are the positions of the stopper 75.

The push lever 15 is separated from the mating material W1 before the time T1. The plunger 60 is stopped at the initial position before the time T1. The striking portion 13 is stopped at top dead center before the time T1. The pressure in the return chamber 37 is atmospheric pressure before time T1. The stopper 75 is stopped at the standby position before the time T1.

When the push lever 15 is pressed against the mating material W1 at time T1 with the operating force applied to the trigger 14, the plunger 60 operates from the initial position to the operating position. That is, the trigger valve 16 switches from the initial state to the operating state. Then, the striking portion 13 operates from the top dead center to the bottom dead center, and the pressure in the accumulator chamber 21 decreases. Further, the check valve 41 is opened by the operation of the striking portion 13, and the compressed air in the accumulator chamber 21 flows into the return chamber 37, so that the pressure in the return chamber 37 rises. Therefore, the stopper 75 operates from the standby position to the blocking position.

The striking portion 13 strikes the nail 52 and reaches the bottom dead center at time T2. Further, the pressure in the accumulator chamber 21 and the air pressure in the return chamber 37 are both increased by the supply of air from the compressed air supply device. The compressed air supply device is, for example, a compressor. Next, when the push lever 15 separates from the mating material W1 at time T3, the plunger 60 operates from the operating position to the initial position. The plunger 60 stops at the initial position at time T4. That is, the trigger valve 16 switches from the operating state to the initial state, and the piston upper chamber 29 becomes atmospheric pressure. Then, the piston 24 is separated from the bumper 34 at time T5, and the striking portion 13 operates toward the top dead center. When the piston 24 is separated from the bumper 34, the pressure in the return chamber 37 decreases, and the pressure in the accumulator chamber 21 continues to increase.

After the striking portion 13 reaches the top dead center at time T6, the stopper 75 operates from the blocking position to the operating position. After the stopper 75 stops at the standby position at time T7, the pressure in the return chamber 37 drops to atmospheric pressure. The time from time T3 to time T7 shown in FIG. 13 is an example of the predetermined time described in the embodiment. Further, the striking unit 13 starts operating from the bottom dead center to the top dead center at a time T5 after the time T3, and the striking unit 13 reaches the top dead center at a time T6 before the time T7. To do.

Then, when the push lever 15 comes into contact with the mating material W1 between the time T3 and the time T7, that is, within a predetermined time from the time T3, a part of the stopper 75 is in the operating region of the protrusion 82 of the valve body 63 or the contact shaft. Since it is located in the operating region of the engaging portion 83 of 49, the striking portion 13 does not operate in the first direction C1.

In the present embodiment, the predetermined time varies depending on the urging force of the spring that urges the stopper 75. With the stopper 75 stopped in the standby state, the first spring is compared with the second spring having a lower urging force than the first spring. The predetermined time corresponding to the first spring is shorter than the predetermined time corresponding to the second spring. As the urging member for urging the stopper 75, synthetic rubber can be used instead of the metal spring.

Further, it is also possible to provide an actuator that operates the stopper 75 from the standby position to the operating position. The actuator includes a solenoid as an example. The solenoid generates a suction force that activates the stopper 75 when power is supplied. The stopper 75 is made of a magnetic material, for example, iron. Then, a power supply, for example, a DC power supply is provided in the housing 11 or the magazine 20. Further, a sensor for detecting the operation of the push lever 15 and a control unit for supplying or stopping the current of the power supply to the actuator according to the signal of the sensor are provided.

An example of the technical meaning of the matters disclosed in this embodiment is as follows. The driving machine 10 is an example of a driving machine. The trigger 14 is an example of an operating member. The push lever 15 is an example of a contact member. The first direction C1 is an example of the first direction. The second direction C2 is an example of the second direction. The striking portion 13 is an example of a striking portion. The top dead center of the striking portion 13 is an example of the first position of the striking portion. The bottom dead center of the striking portion 13 is an example of the second position of the striking portion.

The piston upper chamber 29 is an example of a pressure chamber. The housing 11 is an example of a housing. The accumulator chamber 21 is an example of the accumulator chamber. The trigger valve 16 and the sleeve valve 23 are examples of a switching mechanism. The sleeve valve 23 is an example of the first valve. The trigger valve 16 is an example of the second valve. The state in which the sleeve valve 23 is pressed against the upper cover 27 is an example of the shutoff state of the first valve. The state in which the sleeve valve 23 is separated from the upper cover 27 is an example of the connected state of the first valve. The initial state of the trigger valve 16 is an example of the first state of the second valve. The operating state of the trigger valve 16 is an example of the second state of the second valve. The return chamber 37 is an example of a return chamber. The stopper 75 is an example of a blocking mechanism. The standby position of the stopper 75 is an example of the standby position of the blocking mechanism. The blocking position of the stopper 75 is an example of the blocking position of the blocking mechanism.

The valve body 63 is an example of an operating member. The initial position of the valve body 63 is an example of the initial state of the second valve. The operating position of the valve body 63 is an example of the operating state of the second valve. The bumper 34 is an example of a bumper. The nail 52 is an example of a fastener.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. The operating member is an element that operates by applying an operating force, and the operating member includes a trigger, an arm, a lever, a button, and the like. The operation of the operating member may be either rotation within a predetermined angle or reciprocating operation within a predetermined range. The contact member is an element that can operate in contact with or away from the mating material, and the contact member includes a push lever, a shaft, an arm, and the like.

The first valve that connects and shuts off the pressure chamber and the accumulator chamber includes a sleeve valve, a head valve, a cylinder valve, and the like. The illustrated sleeve valve 23 is an example of a sleeve valve. The sleeve valve is attached to the outer peripheral surface of the cylinder and can be operated in a direction along the center line of the cylinder.

The head valve is actuable with respect to the housing. The head valve is operable with respect to the housing by the pressure of the gas supplied from the accumulator chamber. When the head valve is activated, the head valve contacts and separates from the open end of the cylinder to connect and disconnect the pressure chamber and the accumulator chamber. Fasteners include axially shaped nails and arched nails.

The cylinder valve is capable of the cylinder operating relative to the housing towards the centerline of the cylinder. The valve seat is fixed to the housing. The cylinder valve is operable with respect to the housing by the pressure of the gas supplied from the accumulator chamber. When the cylinder valve operates with respect to the housing, the cylinder valve contacts and separates from the valve seat to connect and disconnect the pressure chamber and the accumulator chamber.

Includes pressure chamber and return chamber, spaces where gas is supplied and discharged, gaps, passages, etc., respectively. The blocking mechanism is an element that can enter and exit the working range of the working element, and the blocking mechanism includes a shaft, an engaging member, an arm, a pin, and the like. The switching mechanism is a mechanism for switching between supplying and shutting off gas to the pressure chamber. The switching mechanism includes a valve. The accumulator chamber is a space for accommodating gas. The bumper is an element that regulates the operating range of the striking portion and absorbs a part of the kinetic energy of the striking portion that operates in the first direction. The bumper may be either a synthetic rubber bumper or an air bumper. The housing includes a tubular member, a body, and a casing. The gas supplied to the accumulator chamber may be an inert gas, for example, nitrogen gas or a rare gas, instead of the compressed air.

10 ... driving machine, 11 ... housing, 13 ... striking part, 14 ... trigger, 15 ... push lever, 16 ... trigger valve, 21 ... accumulator chamber, 23 ... sleeve valve, 29 ... piston upper chamber, 34 ... bumper, 37 ... return chamber, 63 ... valve body, 75 ... stopper, C1 ... first direction, C2 ... second direction

Claims (11)

The operating members to which the operating force is added and released, and
A contact member that can contact and separate the mating material,
A striking portion that can operate in the first direction for striking the fastener to be driven into the mating material, and a second direction opposite to the first direction.
When the contact member comes into contact with the mating material while the operating force is applied to the operating member, a gas is supplied and the striking portion is operated by the pressure of the gas in the first direction.
It is a driving machine equipped with
When the contact member comes into contact with the mating material within a predetermined time from the time when the contact member separates from the mating material after the striking portion hits the fastener, the gas is prevented from being supplied to the pressure chamber. A driving machine equipped with a blocking mechanism. A housing that operably supports the striking portion and
An accumulator chamber provided in the housing and accommodating gas,
A switching mechanism having a first state for discharging gas from the pressure chamber and a second state for supplying gas from the accumulator chamber to the pressure chamber.
Is provided,
The driving machine according to claim 1, wherein the blocking mechanism prevents gas from being supplied to the pressure chamber by holding the switching mechanism in the first state. A return chamber for operating the striking portion in the second direction by the pressure of gas is provided in the housing.
The blocking mechanism is operably attached to the housing between the standby position and the blocking position, and is actuated from the standby position to the blocking position by the pressure of the gas in the return chamber.
The standby position of the blocking mechanism is a position that enables the switching mechanism to switch from the first state to the second state.
The driving machine according to claim 2, wherein the blocking position of the blocking mechanism is a position for holding the switching mechanism in the first state. The switching mechanism is
A first valve that operates at the pressure of a gas and has a connection state that connects the pressure chamber and the accumulator chamber and a cutoff state that shuts off the pressure chamber and the accumulator chamber.
A second valve that operates in response to the addition and release of operating force to the operating member and the contact and separation of the contact member with respect to the mating material.
Have,
The second valve is
An initial state in which the first valve is shut off, an operating state in which the first valve is connected, and
Can be switched with
The first state of the switching mechanism includes that the first valve is in the shutoff state and the second valve is in the initial state.
The driving machine according to claim 3, wherein the second state of the switching mechanism includes the connected state of the first valve and the operating state of the second valve. The second valve has an operating member that switches between the initial state and the operating state by operating the operating member and operating the contact member.
The first valve holds the cutoff state when the operating member is in the initial state, and when the operating member switches from the initial state to the operating state, the first valve switches from the shutoff state to the connected state.
The driving machine according to claim 4, wherein the blocking mechanism holds the first valve in the shut-off state by holding the operating member in the initial state. The driving machine according to claim 5, wherein the blocking mechanism operates from the blocking position to the standby position when the gas pressure in the return chamber drops. The operating force of the contact member is transmitted to the second valve through the operating member.
The blocking mechanism stopped at the standby position enables the operating force of the contact member to be transmitted to the second valve.
The driving machine according to claim 4, wherein the blocking mechanism stopped at the blocking position prevents the operating force of the contact member from being transmitted to the second valve. The driving machine according to claim 7, wherein when the gas pressure in the return chamber drops, the blocking mechanism operates from the blocking position to the standby position and stops at the standby position. The striking portion can operate between the first position and the second position.
The first direction in which the striking portion operates is a direction in which the striking portion operates from the first position to the second position.
The second direction in which the striking portion operates is a direction in which the striking portion operates from the second position to the first position.
The striking portion is any one of claims 3 to 8, wherein the striking portion starts operation from the second position after the contact member is separated from the mating material, and reaches the first position within the predetermined time. The described driving machine. A bumper for stopping the striking portion at the second position is provided in the housing.
When the striking portion is in contact with the bumper, the return chamber is blocked from the outside of the housing.
The driving machine according to claim 9, wherein the return chamber is connected to the outside of the housing when the striking portion is separated from the bumper. The blocking mechanism makes it possible to supply gas to the pressure chamber when the contact member comes into contact with the mating material after the predetermined time has passed from the time when the contact member is separated from the mating material. Item 4. The driving machine according to any one of Items 1 to 10.

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