JPWO2020184218A1 - Driving machine - Google Patents

Abstract

Provided is a driving machine capable of improving the operability of operating members. A trigger (14) provided on the housing (11) that operates in the addition direction (E1) and the release direction (E2), and a blow that is supported by the housing (11) and can be operated in the first direction in which the fastener is driven. When the unit and the trigger (14) operate in the additional direction (E1), the drive unit that operates the striking unit in the first direction, and the partner that is operably provided with respect to the housing (11) and for driving the fastener. An auxiliary mechanism (85) that is a driving machine (10) provided with a contact member capable of contacting or separating the material, and capable of adding or not adding an urging force in the release direction (E2) to the trigger (14). Is provided, and the auxiliary mechanism (85) has a first state in which when the trigger (14) operates in the addition direction (E1), the urging force in the release direction (E2) with respect to the trigger (14) is not added. When the trigger (14) operates in the release direction (E2), it has a second state in which an urging force in the release direction (E2) is applied.

Description

The present invention relates to a driving machine having a striking portion for striking a fastener and a driving portion for operating the striking portion.

Patent Document 1 describes an example of a driving machine having a striking portion for striking a fastener and a driving portion for operating the striking portion. The driving machine described in Patent Document 1 includes a housing, a cylinder, a valve, a pressure chamber as a drive unit, an exhaust valve chamber, an auxiliary pressure chamber, an accumulator chamber, a striking unit, an exhaust valve, a trigger as an operating member, and a push lever. It has a return air chamber, an injection part, and a magazine. Further, a mechanism for transmitting the operation of the trigger and the push lever to the valve is provided. The magazine houses the fasteners, which are supplied to the ejection 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 from the top dead center to the bottom dead center, and the striking portion strikes the fastener and reaches the bottom dead center. While the striking part is operating from the top dead center to the bottom dead center, the air pressure in the lower chamber of the piston rises.

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

Japanese Unexamined Patent Publication No. 2015-58486

The inventor of the present application has recognized that when switching the valve from the operating state to the initial state, it is necessary to perform an operation of releasing the operating force applied to the operating member, which reduces the operability.

An object of the present invention is to provide a driving machine capable of improving the operability of an operating member.

The driving machine of one embodiment is provided in a housing and operates in an additional direction when the user applies an operating force, and operates in a release direction opposite to the additional direction when the user releases the operating force. When the operating member, the striking portion supported by the housing and capable of operating in the first direction in which the fastener is driven, and the second direction opposite to the first direction, and the operating member operating in the additional direction, A driving unit including a driving unit that operates the striking portion in the first direction and a contact member that is operably provided with respect to the housing and that can contact or separate the mating material into which the fastener is driven. The machine is provided with an auxiliary mechanism capable of switching between application and non-addition of urging force in the release direction to the operation member, and the auxiliary mechanism is said when the operation member operates in the addition direction. It has a first state in which the urging force in the release direction is not applied to the operating member, and a second state in which the urging force in the release direction is applied when the operating member operates in the release direction.

The driving machine of one embodiment can improve the operability of the operating member.

It is an overall cross-sectional view which shows Embodiment 1 of the driving machine included in this invention. It is a partial cross-sectional view which shows the housing, the cylinder and the head valve of the driving machine shown in FIG. It is an example of a return mechanism provided in the driving machine of FIG. 1, and is a cross-sectional view showing a state in which a movable member is stopped at an initial position. FIG. 3 is a cross-sectional view of the return mechanism shown in FIG. 3 in a state where the movable member is in the operating position. FIG. 3 is a cross-sectional view of the return mechanism shown in FIG. 3 in a state in which an operating force is applied to the trigger. Another example of the return mechanism provided in the driving machine of FIG. 1, is a cross-sectional view showing a state in which a movable member is stopped at an initial position. FIG. 6 is a cross-sectional view of the return mechanism shown in FIG. 6 in a state where the movable member is in the operating position. FIG. 3 is a cross-sectional view of the return mechanism shown in FIG. 3 in a state in which an operating force is applied to the trigger. It is an overall cross-sectional view which shows Embodiment 2 of a driving machine. 9 is a cross-sectional view showing a state in which a movable member is stopped at an initial position, which is a return mechanism provided in the driving machine of FIG. FIG. 9 is a cross-sectional view of the return mechanism shown in FIG. 9 in a state where the movable member is in the operating position. FIG. 9 is a cross-sectional view of the return mechanism shown in FIG. 9 in a state in which an operating force is applied to the trigger.

Next, among some embodiments included in the driving machine of the present invention, a typical driving machine will be described with reference to the drawings.

(Embodiment 1) Embodiment 1 of the driving machine will be described with reference to FIG. The driving machine 10 includes a housing 11, a cylinder 12, a striking portion 13, an injection portion 15, a trigger valve 51, a trigger 14, and a push lever 16. Further, the magazine 17 is attached to the driving machine 10. The housing 11 has a tubular body portion 18, a head cover 21 fixed to the body portion 18, and a handle 19 connected to the body portion 18. The handle 19 projects from the outer surface of the body portion 18.

As shown in FIGS. 1 and 2, the accumulator chamber 20 is formed over the inside of the handle 19, the inside of the body portion 18, and the inside of the head cover 21. The air hose is connected to the handle 19. Compressed air as a compressed gas is supplied into the accumulator chamber 20 via an air hose. The cylinder 12 is provided in the body portion 18.

The head valve 31 is provided in the head cover 21. The head valve 31 can move in the direction of the center line A1 of the cylinder 12. The control chamber 27 is formed between the head cover 21 and the head valve 31. The urging member 28 is provided in the control chamber 27. The urging member 28 is, for example, a metal compression coil spring. The urging member 28 urges the head valve 31 in the direction closer to the cylinder 12 in the center line A1 direction. The head valve 31 is constantly urged away from the cylinder 12 by the pressure of the accumulator chamber 20.

A stopper 29 is provided in the head cover 21. The stopper 29 is made of synthetic rubber as an example. The head cover 21 has an exhaust passage 24. The exhaust passage 24 is connected to the outer B1 of the housing 11.

The cylinder 12 is positioned and fixed with respect to the body portion 18 in the direction along the center line A1. A valve seat 32 is attached to the end of the cylinder 12 at a position closest to the head valve 31 in the direction along the center line A1. The valve seat 32 is annular and is made of synthetic rubber.

The striking portion 13 has a piston 34 and a driver blade 35 fixed to the piston 34. The piston 34 is arranged in the cylinder 12, and the striking portion 13 can move linearly along the center line A1. That is, the striking portion 13 can reciprocate along the first direction D1 and the second direction D2. The first direction D1 can be defined as descending in FIGS. 1 and 2, and the second direction D2 can be defined as ascending. The first direction D1 and the second direction D2 are opposite directions. A seal member 99 is attached to the outer peripheral surface of the piston 34. The piston upper chamber 36 is formed between the stopper 29 and the piston 34.

The injection portion 15 is fixed to the body portion 18 at an end portion opposite to the portion where the head cover 21 is provided in the direction along the center line A1. The bumper 37 is provided in the cylinder 12. The bumper 37 is arranged in the cylinder 12 at a position closest to the injection portion 15 in the center line A1 direction. The bumper 37 is made of synthetic rubber or silicon rubber. The bumper 37 has a shaft hole 38, and the driver blade 35 can move in the shaft hole 38 in the direction of the center line A1. In the cylinder 12, a piston lower chamber 39 is formed between the piston 34 and the bumper 37. The lower chamber of the piston is connected to the shaft hole. The seal member 99 airtightly shuts off the piston lower chamber 39 and the piston upper chamber 36.

An annular partition wall 40 is provided in the body portion 18. The partition wall 40 is arranged so as to surround the outer periphery of the cylinder 12, and positions the cylinder 12 with respect to the housing in a direction intersecting the center line A1. The return air chamber 43 is formed between the outer surface of the cylinder 12 and the body portion 18. The partition wall 40 separates the accumulator chamber 20 and the return air chamber 43.

Passages 41 and 42 that penetrate the cylinder 12 in the radial direction are provided. The passage 42 is arranged between the passage 41 and the injection portion 15 in the direction of the center line A1. The passage 41 connects the piston lower chamber 39 and the return air chamber 43. The check valve 44 shown in FIG. 3 is attached to the outer surface of the cylinder 12. The check valve 44 opens the passage 41 by the air pressure in the cylinder 12. The check valve 44 closes the passage 41 with the air pressure of the return air chamber 43. The passage 42 always connects the return air chamber 43 and the piston lower chamber 39. Air is present in the piston lower chamber 39 and the return air chamber 43.

As shown in FIG. 1, a trigger valve 51 is provided at a connection point between the body portion 18 and the handle 19. The trigger valve 51 has a plunger 52, a body 53, a valve body 55, and a spring 69, as shown in FIGS. 3, 4, and 5. Both the body 53 and the valve body 55 have a tubular shape, and both the body 53 and the valve body 55 are arranged concentrically with the center line A2 as the center. FIG. 1 shows an example in which the center line A1 and the center line A2 are parallel to each other. The body 53 is fixed to the housing 11. The valve body 55 can operate in the body 53 in the direction along the center line A2. The body 53 has a passage 56, an exhaust passage 61, and a shaft hole 62. The passage 56 is connected to the control room 27 via the passage 57. The passage 57 is provided in the housing 11.

Further, the handle 19 has a passage 58, and the passage 58 connects the accumulator chamber 20 and the inside of the body 53. The exhaust passage 61 is connected to the outer B1 of the housing 11. The plunger 52 is arranged in the shaft hole 62 and the valve body 55. The plunger 52 can move in the direction along the center line A2. In the plunger 52, the end portion in the direction along the center line A2 is arranged on the outer B1 of the housing 11. The spring 69 is made of metal as an example. The spring 69 urges the plunger 52 in a direction along the center line A2 so as to approach the trigger 14. The spring 69 is urging the valve body 55 in a direction along the center line A2 so as to approach the passage 58.

The injection portion 15 shown in FIG. 1 is made of metal or non-ferrous metal as an example. The injection portion 15 has a tubular portion 70 and a flange 71 connected to the outer peripheral surface of the tubular portion 70. The flange 71 is fixed to the body portion 18. The tubular portion 70 projects from the flange 71 in the direction along the center line A1, and the tubular portion 70 has an injection path 72. The exit path 72 is a hole or space, and the center line A1 is located in the exit path 72. The driver blade 35 can operate in the injection path 72 in the direction along the center line A1. The magazine 17 is attached to the injection portion 15. The magazine 17 accommodates the nail 73. The magazine 17 has a feeder 74, and the feeder 74 sends the nail 73 in the magazine 17 to the injection path 72.

The push lever 16 is attached to the injection portion 15. The push lever 16 can operate in the direction along the center line A1 with respect to the injection portion 15. The guide member 63 and the holder 64 are attached to the outer surface of the housing 11, for example, the body portion 18. The guide member 63 and the holder 64 are arranged between the trigger valve 51 and the injection portion 15 in the direction along the center line A2. The holder 64 has a tubular shape, and the holder 64 movably supports the transmission member 65. The transmission member 65 can move in the direction along the center line A3 together with the push lever 16. The center line A3 is parallel to the center line A2.

The guide member 63 movably supports the transmission member 67. The moving direction of the transmission member 67 and the transmission member 65 is a direction along the center line A3. The transmission member 67 has a shaft shape, and a plate 68 is provided at an end portion of the transmission member 67. A spring 45 is arranged between the guide member 63 and the plate 68. The spring 45 urges the transmission member 67 in a direction that separates it from the trigger valve 51. The transmission member 67 stops at the initial position when the plate 68 is pressed against the holder 64. The spring 45 is made of metal as an example. The guide member 63 moves the transmission member 67 in the direction along the center line A3. The transmission member 67 has a protrusion 80. The protrusion 80 is provided at a position located between the guide member 63 and the trigger valve 51 in the direction along the center line A3 of the transmission member 67. The protrusion 80 projects from the transmission member 67 in a direction intersecting the center line A3.

As shown in FIGS. 3, 4 and 5, the trigger 14 is arranged on the outer B1 of the housing 11. The trigger 14 is arranged between the trigger valve 51 and the guide member 63 in the direction along the center line A2. The trigger 14 is attached to the body portion 18 via the support shaft 81. The trigger 14 can rotate about the support shaft 81.

The direction in which the trigger 14 operates counterclockwise in FIG. 3 can be defined as the additional direction E1. The direction in which the trigger 14 operates clockwise in FIG. 3 can be defined as the release direction E2. The addition direction E1 is a direction in which the trigger 14 approaches the trigger valve 51. The release direction E2 is a direction in which the trigger 14 is separated from the trigger valve 51. The addition direction E1 and the release direction E2 are opposite directions. When the trigger 14 comes into contact with the body 53 or the guide member 63, the operating range of the trigger 14 is limited.

The trigger 14 has an arm 82 and a boss portion 83. The protrusion 80, the arm 82, and the spring 45 form an auxiliary mechanism 85. A spring 84 is provided between the boss portion 83 and the body 53. The trigger 14 is urged by the spring 84 clockwise around the support shaft 81 in FIG. The spring 84 is, for example, a metal spring. The protrusion 80 of the transmission member 67 is located between the arm 82 and the boss 83 in a direction intersecting the center line A3.

Next, an example of driving the nail 73 into the mating material W1 using the driving machine 10 will be described. The mating material W1 includes wood, gypsum board, concrete and the like. First, when the user separates the push lever 16 shown in FIG. 1 from the mating material W1, the plate 68 is pressed against the holder 64 and the transmission member 67 is stopped at the initial position. 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 member 63 as shown in FIG. The position of the protrusion 80 in the direction along the center line A3 is the same as the tip of the arm 82.

When the trigger 14 is stopped at the initial position, the trigger valve 51 holds the initial state shown in FIG. When the trigger valve 51 is in the initial state, the plunger 52 is stopped at the initial position pressed against the body 53 by the urging force of the spring 69. The valve body 55 is stopped at the initial position pressed against the body 53 by the spring 69. The valve body 55 connects the accumulator chamber 20 and the passage 56, and shuts off the passage 56 and the exhaust passage 61.

The compressed air in the accumulator chamber 20 is supplied to the control chamber 27, and the head valve 31 is pressed against the valve seat 32 and stopped as shown in FIG. The head valve 31 shuts off the accumulator chamber 20 and the piston upper chamber 36, and connects the piston upper chamber 36 and the exhaust passage 24. The pressure in the piston upper chamber 36 is the same as the atmospheric pressure. The striking portion 13 is stopped at the position where the piston 34 is closest to the stopper 29, that is, at the top dead center. The striking portion 13 is stopped at the top dead center due to the frictional force between the seal member 99 and the cylinder 12 or the engaging force between the seal member 99 and the cylinder 12.

Next, when the user presses the push lever 16 against the mating material W1, the operating force of the push lever 16 is transmitted to the transmission member 67 via the transmission member 65. The transmission member 67 operates in the third direction D3 that approaches the trigger valve 51 against the force of the spring 45, and the transmission member 67 stops at the operating position shown in FIG. The third direction D3 is a direction along the center line A3. When the transmission member 67 stops at the operating position, the protrusion 80 is located between the tip of the arm 82 and the body 53 in the direction along the center line A3.

When the user presses a finger against the trigger 14 to apply an operating force and rotates the trigger 14 counterclockwise against the force of the spring 84, the trigger 14 is the body 53 or the handle as shown in FIG. It stops at the operating position in contact with 19. The operating force of the trigger 14 is transmitted to the plunger 52 via the boss portion 83. Therefore, the plunger 52 operates from the initial position toward the passage 58 against the force of the spring 69, and the plunger 52 stops at the operating position. Further, in the process in which the trigger 14 operates in the addition direction E1 from the initial position, the protrusion 80 is separated from the arm 82. Therefore, the protrusion 80 does not prevent the trigger 14 from operating in the addition direction E1.

When the plunger 52 moves from the initial position to the operating position, the trigger valve 51 switches from the initial state to the operating state. When the trigger valve 51 is in the operating state shown in FIG. 5, the valve body 55 operates in a direction away from the passage 58 by the pressure of the accumulator chamber 20, and the valve body 55 stops at the operating position pressed against the body 53. do. The valve body 55 stopped at the operating position shuts off the accumulator chamber 20 and the passage 56, and connects the passage 56 to the exhaust passage 61. Therefore, the compressed air in the control chamber 27 is discharged to the outside B1 through the passage 57, the passage 56, and the exhaust passage 60, and the pressure in the control chamber 27 becomes the same as the atmospheric pressure.

When the pressure in the control chamber 27 becomes the same as the atmospheric pressure, the head valve 31 operates against the urging force of the urging member 28 by the pressure of the accumulator chamber 20 and stops at the operating position in contact with the stopper 29. do. The head valve 31 stopped at the operating position connects the accumulator chamber 20 and the piston upper chamber 36, and shuts off the piston upper chamber 36 and the exhaust passage 24. The pressure of the piston upper chamber 36 rises, the striking portion 13 operates from the top dead center to the bottom dead center, and the driver blade 35 strikes the nail 73 in the injection path 72. The hit nail 73 is driven into the mating material W1. While the striking portion 13 is operating from the top dead center to the bottom dead center, the pressures in the piston lower chamber 39 and the return air chamber 43 increase. Further, the check valve 44 opens, and the air in the piston upper chamber 36 returns through the passage 41 and flows into the air chamber 43.

After the striking portion 13 drives the nail 73 into the mating material W1, the piston 34 collides with the bumper 37, and the bumper 37 absorbs a part of the kinetic energy of the striking portion 13. The position of the striking portion 13 at the time when the piston 34 collides with the bumper 37 is the bottom dead center. When the striking portion 13 reaches the bottom dead center, the check valve 44 closes the passage 41. When the piston 34 is pressed against the bumper, the piston 34 shuts off the piston lower chamber 39 and the shaft hole 38.

The push lever 16 separates the nail 73 from the mating material W1 due to the reaction of the nail 73 being driven into the mating material W1. Then, the transmission member 67 operates in the fourth direction D4 in FIG. 5 by the force of the spring 45. The fourth direction D4 is a direction along the center line A3. Then, when the plate 68 is pressed against the holder 64 as shown in FIG. 3, the transmission member 67 and the push lever 16 stop at the initial positions. While the transmission member 67 is operating along the center line A3 in a direction away from the trigger valve 51, the protrusion 80 is pressed against the arm 82. A part of the operating force of the transmission member 67 is converted into a force for operating the trigger 14 clockwise in FIG. 5, and the trigger 14 returns to the initial position shown in FIG. 3 and stops.

That is, the trigger 14 can be returned from the operating position of FIG. 5 to the initial position of FIG. 3 by utilizing the force of the spring 45, which is a power source for returning the transmission member 67 and the push lever 16 from the operating position to the initial position. Therefore, the user does not have to intentionally perform the operation of releasing the operating force applied to the trigger 14 or separating the finger from the trigger 14. Therefore, the operability for the trigger 14 is improved.

As described above, the spring 45 serves as a return mechanism for operating the trigger 14 from the operating position to the initial position. When the trigger 14 is operated from the initial position to the operating position, the urging force of the spring 45 is not transmitted in the direction in which the trigger 14 is operated clockwise in FIG. Therefore, it is possible to suppress an increase in the operating force required to operate the trigger 14 from the initial position to the operating position. The operating force required to operate the trigger 14 from the initial position to the operating position is determined according to the urging force of the springs 45 and 84.

Further, in the process in which the trigger 14 operates in the addition direction E1 to the operating position, the protrusion 80 is separated from the arm 82. Therefore, in the stroke in which the trigger 14 operates in the addition direction E1 from the initial position to the operation position, the urging force of the spring 45 is not applied in the release direction E2 of the trigger 14.

When the user applies an operating force to the trigger 14 shown in FIG. 3 while the push lever 16 is separated from the mating material W1, the arm 82 comes into contact with the protrusion 80. Therefore, the trigger 14 is prevented from rotating counterclockwise, and the trigger valve 51 holds the initial state.

Further, when the push lever 16 separates from the mating material W1 or the operating force on the trigger 14 is released after the striking portion 13 reaches the bottom dead center, the trigger valve 51 switches from the operating state to the initial state. .. Therefore, the striking portion 13 operates in the first direction D1 under the pressure of the piston lower chamber 39, and the striking portion 13 stops at the top dead center. Further, when the piston 34 is separated from the bumper 37, the air in the piston lower chamber 39 is discharged from the shaft hole 38 to the outside B1. After the striking portion 13 reaches the top dead center, the pressures of the piston lower chamber 39 and the return air chamber 43 become substantially the same as the atmospheric pressure.

6, 7 and 8 are cross-sectional views showing another specific example of the return mechanism. A valve 90 is provided on the housing 11, the handle 19 as an example. The trigger valve 51 is located between the valve 90 and the body 18 in the direction in which the handle 19 protrudes from the body 18, that is, in the direction intersecting the center line A2. The valve 90 has a support hole 91, a plunger 92 and an urging member 93.

The support hole 91 connects the accumulator chamber 20 and the external B1. The plunger 92 is arranged in the support hole 91, and the plunger 92 can move in the direction along the center line A4 with respect to the handle 19. The center line A4 is parallel to the center line A2. An annular sealing member 94 is attached to the outer peripheral surface of the plunger 92.

A part of the plunger 92 in the length direction is arranged on the outer B1, and a plate 95 is provided at a position arranged on the outer B1 of the plunger 92. The urging member 93 is, for example, a metal spring, and the urging member 93 urges the plunger 92 toward the trigger 14. The trigger 14 has a contact portion 96. The boss portion 83 is located between the contact portion 96 and the support shaft 81 in the length direction of the trigger 14. The plate 95 is arranged in the working region of the contact portion 96.

When the trigger 14 is stopped at the initial position as shown in FIG. 6, the contact portion 96 is separated from the plate 95. The plunger 92 is stopped at the initial position with the seal member 94 pressed against the inner surface of the support hole 91. The seal member 94 airtightly shields the accumulator chamber 20 from the external B1. When the push lever 16 is pressed against the mating material W1, the transmission member 67 moves from the initial position to the operating position as shown in FIG. 7 and stops. The contact portion 96 is separated from the plate 95.

When the user presses the push lever 16 against the mating material W1 and applies an operating force to the trigger 14 to operate the trigger 14 in the addition direction E1 shown in FIG. 7, the contact portion 96 presses against the plate 95. Be done. The plunger 92 operates in a direction approaching the accumulator chamber 20 against the force of the urging member 93. When the trigger 14 stops at the operating position as shown in FIG. 8, the plunger 92 stops at the operating position. When the plunger 92 stops at the operating position, the seal member 94 is separated from the inner surface of the support hole 91, and the support hole 91 connects the accumulator chamber 20 and the outer B1. The compressed air in the accumulator chamber 20 is blown to the trigger 14 through the support hole 91. When the user releases the operating force on the trigger 14, the trigger 14 is urged in the release direction E2 by the kinetic energy of the compressed air blown from the support hole 91 to the trigger 14. Therefore, the operability when returning the trigger 14 from the operating position to the initial position is improved.

Further, when the operating force applied to the trigger 14 is released, the plunger 92 operates by the urging force of the urging member 93, the seal member 94 is pressed against the inner surface of the support hole 91, and the plunger 92 stops at the initial position. .. That is, the valve 90 returns to the initial state.

In this way, the valve 90 serves as a return mechanism for operating the trigger 14 from the operating position to the initial position. During the operation of the trigger 14 from the initial position to the operating position, the valve 90 closes the support hole 91, and the compressed air in the accumulator chamber 20 is not exhausted from the support hole 91 to the outside B1. That is, in FIG. 7, no force is generated in the direction in which the trigger 14 is operated clockwise. Therefore, it is possible to suppress an increase in the operating force required to operate the trigger 14 from the initial position to the operating position.

If the contact portion 96 is separated from the plate 95 in the process of operating the trigger 14 in the addition direction E1, the compressed air in the accumulator chamber 20 is not discharged from the support hole 91 to the outside B1. That is, in the process in which the trigger 14 operates in the addition direction E1, the kinetic energy of the compressed air is not added to the release direction E2 of the trigger 14.

Further, other structures and functions of the driving machine 10 shown in FIGS. 6, 7 and 8 are the same as those of the driving machine 10 shown in FIGS. 1, 2, 3, 4, and 5. In addition, in FIG. 6, FIG. 7 and FIG. 8, the protrusion 80 and the arm 82 may not be provided.

(Embodiment 2) FIG. 9 shows the second embodiment of the driving machine. The driving machine 100 includes a housing 111, an electric motor 112, a striking unit 113, an injection unit 114, and a power supply 115. The housing 111 includes a cylinder case 116, a motor case 117, a handle 118, a head cover 119, and a mounting portion 120. The cylinder case 116 has a tubular shape, and the motor case 117 is connected to the cylinder case 116. The handle 118 is provided so as to project from the cylinder case 116. The mounting portion 120 connects the handle 118 and the motor case 117.

The power supply 115 is a battery that can be attached to and detached from the mounting portion 120. The power supply 115 includes a storage case and a battery cell housed in the storage case. Battery cells include lithium ion batteries, nickel metal hydride batteries, lithium ion polymer batteries and nickel cadmium batteries. A battery cell is a secondary battery capable of repeating charging and discharging.

The cylinder 121 is fixedly provided in the cylinder case 116. The striking portion 113 can operate in the first direction D1 and the second direction D2 along the center line A5 of the cylinder 121. The striking portion 113 has a piston 122 and a driver blade 123. The piston 122 is housed in the cylinder 121. The driver blade 123 has a shaft shape, and the driver blade 123 has a rack along the center line A5. ..

The accumulator container 124 is provided in the head cover 119, and the accumulator container 124 is fixed to the cylinder 121. The pressure chamber 125 is formed from the inside of the accumulator container 124 to the inside of the cylinder 121. The pressure chamber 125 is filled with gas. The gas may be a compressible gas, and the gas may be an inert gas such as nitrogen gas or a rare gas in addition to air. In the present disclosure, an example in which the pressure chamber 125 is filled with air will be described.

The bumper 126 is provided in the cylinder case 116. A part of the bumper 126 is arranged in the cylinder 121. The bumper 126 is made of rubber or urethane. The bumper 126 is annular. The injection portion 114 is fixed to the cylinder case 116. The injection section 114 has an injection path 127. The magazine 135 is attached to the injection section 114. The magazine 135 accommodates the nail 131. A feeder 132 is provided in the magazine 135, which feeds the nail 131 to the ejection path 127.

The push lever 128 is attached to the injection portion 114, and the push lever 128 can move in the center line A5 direction with respect to the injection portion 114. The trigger 14 and the guide member 63 are provided in the cylinder case 116. Further, the guide member 63 operably supports the transmission member 67 along the center line A3. The center line A3 is parallel to the center line A5. The spring 45 urges the transmission member 67 in a direction away from the handle 118. The transmission member 67 has a protrusion 80.

The transmission member 67 has a plate 68, and the operating force of the push lever 128 is transmitted to the plate 68. The trigger 14 is arranged between the guide member 63 and the handle 118 in the direction along the center line A3. The trigger 14 has an arm 82 and a boss portion 83. A spring 84 is provided between the handle 118 and the boss portion 83. The spring 84 is made of metal, and the spring 84 urges the trigger 14 toward the guide member 63.

A trigger switch 129 is provided on the handle 118. The trigger switch 129 has a contact 130, which is exposed to the outer B1 of the housing 111. When the trigger 14 operates around the support shaft 81, the contact 130 is arranged in the operating region of the boss portion 83.

The control unit 136 is provided in the mounting unit 120, and the signal of the trigger switch 129 is input to the control unit 136. The control unit 136 is composed of a microcomputer having an input port, an output port, an arithmetic processing unit, a storage unit, and the like. A push switch for detecting whether the push lever 128 is pressed against or separated from the mating material W1 is provided in the injection unit 114, and the signal of the push switch is input to the control unit 136. The control unit 136 controls the supply and stop of electric power from the power supply 115 to the electric motor 112.

The electric motor 112 is arranged in the motor case 117. A speed reducer 133 and a wheel 134 are provided. The speed reducer 133 is a mechanism for transmitting the rotational force of the electric motor 112 to the wheel 134. The speed reducer 133 has a plurality of planetary gear mechanisms, and the speed reducer 133 reduces the rotation speed of the wheel 134 with respect to the rotation speed of the electric motor 112. A pinion is provided on the outer peripheral surface of the wheel 134. The pinion can engage and disengage the rack of driver blades 123.

Next, an example of using the driving machine 100 will be described. When the user separates the push lever 128 from the mating material W1 and releases the operating force on the trigger 14, the transmission member 67 stops at the initial position and the trigger 14 is initially set, as shown in FIG. It is stopped at the position. When the trigger 14 is stopped at the initial position, the boss portion 83 is separated from the contact 130 and the trigger switch 129 is turned off. The control unit 136 stops the supply of electric power from the power supply 115 to the electric motor 112 when the trigger switch 129 is turned off and the push switch is turned off. The striking portion 113 is stopped at the standby position. The standby position of the striking portion 113 is a position in the direction along the center line A5.

When the push lever 128 is pressed against the mating material W1 with the operating force on the trigger 14 released, the operating force of the push lever 128 is transmitted to the transmission member 67. The transmission member 67 operates from the initial position of FIG. 10 in the third direction D3 as shown in FIG. 11 and stops at the operating position. The trigger switch 129 is off, and the control unit 136 stops supplying electric power from the power supply 115 to the electric motor 112.

With the push lever 128 pressed against the mating material W1, an operating force is applied to the trigger 14 to operate the trigger 14 in the addition direction E1 shown in FIG. Then, as shown in FIG. 12, the trigger 14 stops at the operating position in contact with the handle 118. When the trigger 14 is in the operating position, the boss portion 83 pushes the contact 130 and the trigger switch 129 is turned on.

When the control unit 136 detects that the push switch is on and the trigger switch 129 is on, the power supply 115 supplies electric power to the electric motor 112. The rotational force of the electric motor 112 is transmitted to the wheel 134 via the speed reducer 133. When the pinion of the wheel and the rack of the driver blade 123 are engaged with each other, the rotational force of the wheel 134 causes the striking portion 113 to operate in the second direction D2 from the standby position toward the top dead center, that is, to rise. When the striking portion 113 rises, the pressure in the pressure chamber 125 rises. When the pinion of the wheel and the rack of the driver blade 123 are released, the striking portion 113 operates in the first direction D1 under the pressure of the pressure chamber 125, that is, descends, and the driver blade 123 strikes the nail 131. The piston 122 collides with the bumper 126. The position of the striking portion 113 in the state where the piston 122 collides with the bumper 126 is the bottom dead center. After the driver blade 123 hits the nail 131, the control unit 136 stops the supply of electric power to the electric motor 112. Therefore, the striking portion 113 stops at the standby position.

When the push lever 128 is separated from the mating material W1 by the reaction of the striking portion 113 driving the nail 131 into the mating material W1, the transmission member 67 is actuated in the fourth direction D4 from the operating position of FIG. 12 by the urging force of the spring 45. Then, it stops at the initial position shown in FIG. While the transmission member 67 is operating from the operating position to the initial position, the protrusion 80 is pressed against the arm 82. A part of the operating force of the transmission member 67 is converted into a force for operating the trigger 14 in the release direction E2 in FIG. 12, and the trigger 14 returns to the initial position shown in FIG. 10 and stops.

That is, a part of the force of the spring 45 that operates the transmission member 67 from the operating position in the fourth direction D4 is converted into a force for the trigger 14 from the operating position of FIG. 12 to the initial position of FIG. Therefore, the user does not have to intentionally perform the operation of releasing the operating force applied to the trigger 14 or separating the finger from the trigger 14. Therefore, the operability for the trigger 14 is improved.

As described above, the spring 45 serves as a return mechanism for operating the trigger 14 from the operating position to the initial position. Further, the urging force of the spring 45 is not transmitted in the direction in which the trigger 14 is operated clockwise in FIG. Therefore, it is possible to suppress an increase in the operating force required to operate the trigger 14 from the initial position to the operating position.

When the user applies an operating force to the trigger 14 shown in FIG. 10 while the push lever 128 is separated from the mating material W1, the arm 82 comes into contact with the protrusion 80. Therefore, the trigger 14 is prevented from rotating counterclockwise in FIG. 10, and the trigger switch 129 is kept off.

An example of the meaning of the technical matters disclosed in the embodiment is as follows. The driving machines 10 and 100 are examples of driving machines. Housings 11 and 111 are examples of housings. The addition direction E1 is an example of the addition direction. The release direction E2 is an example of the release direction. The addition direction E1 and the release direction E2 are opposite to each other. The addition direction can be defined as the going direction. The release direction can be defined as the return direction. The trigger 14 is an example of an operating member. The striking portions 13 and 113 are examples of striking portions. The first direction D1 is an example of the first direction. The first direction can be defined as the striking direction. The second direction D2 is an example of the second direction. The second direction can be defined as the return direction. The piston upper chamber 36, the pressure chamber 125, the speed reducer 133, and the electric motor 112 are examples of the drive unit.

The push levers 16 and 128 are examples of contact members. The auxiliary mechanism 85 and the valve 90 are examples of the auxiliary mechanism, respectively. As shown in FIGS. 4, 7 and 11, respectively, the state in which the protrusion 80 is separated from the arm 82 is an example of the first state of the auxiliary mechanism. As shown in FIGS. 5, 8 and 12, the state in which the protrusion 80 contacts the arm 82 and the urging force of the spring 45 can be applied to the trigger 14 as the urging force in the release direction E2 is the state of the auxiliary mechanism. This is an example of two states. As shown in FIG. 7, the state in which the valve 90 closes the support hole 91 is an example of the first state of the auxiliary mechanism. As shown in FIG. 8, the state in which the valve 90 opens the support hole 91 is an example of the second state of the auxiliary mechanism.

The piston upper chamber 36 is an example of a pressure chamber. The trigger valve 51 is an example of a switching mechanism. The operating state of the trigger valve 51 is an example of a striking state. The initial state of the trigger valve 51 is an example of a non-striking state. The pressure chamber 125 is an example of a gas spring. The pressure of the compressed gas in the pressure chamber 125 is an example of elastic energy. The electric motor 112 is an example of an electric motor. The nails 73 and 131 are examples of fasteners. The fastener may be in the shape of a rod or an arch.

The driving machine is not limited to the disclosed embodiment, and can be variously changed without departing from the gist thereof. For example, the operating member and the contact member include a lever, a button, an arm, and the like, respectively. The operation of the operating member may be either a rotary operation within a predetermined angle range or a linear reciprocating operation. The "driving unit that operates the striking unit in the first direction" may be either the first driving unit or the second driving unit. The first drive unit operates the striking unit in the first direction and does not operate the striking unit in the second direction. The second drive unit operates the striking unit in the second direction and then operates the striking unit in the first direction.

Further, the element that applies the operating force in the fourth direction D4 to the transmission member 67, that is, the return mechanism that applies the operating force in the release direction to the trigger 14, is a gas spring or synthetic rubber instead of the metal spring 45. It is also possible to use a permanent magnet. For example, it is also possible to attach permanent magnets having opposite polarities to the plate 68 and the guide member 63, and to apply the operating force in the fourth direction D4 to the transmission member 67 by the repulsive force between the permanent magnets. The housing is an element that constitutes a part of the main body of the driving machine, and the housing includes a casing, a shell, and the like.

In the driving machine 100 shown in FIG. 9, as the spring for operating the striking portion 113 in the first direction D1, a metal spring can be used instead of the pressure chamber 125 constituting the gas spring. When the striking portion operates in the second direction, the metal spring elastically deforms and stores elastic energy. The striking portion can be operated in the first direction by the elastic energy of the metal spring.

10,100 ... Driving machine, 11,111 ... Housing, 13,113 ... Strike part, 14 ... Trigger, 16,128 ... Push lever, 36 ... Piston upper chamber, 45 ... Spring, 51 ... Trigger valve, 67 ... Transmission Member, 80 ... protrusion, 82 ... arm, 85 ... auxiliary mechanism, 90 ... valve, 96 ... contact part, 112 ... electric motor, 125 ... pressure chamber, 133 ... reducer, D1 ... first direction, D2 ... second Direction, E1 ... Addition direction, E2 ... Release direction

Claims (6)

An operating member provided on the housing that operates in the additional direction when the user applies an operating force, and operates in the release direction opposite to the additional direction when the user releases the operating force.
A striking portion that is supported by the housing and can operate in the first direction in which the fastener is driven and in the second direction opposite to the first direction.
When the operating member operates in the additional direction, a driving unit that operates the striking unit in the first direction and a driving unit that operates the striking unit in the first direction.
A contact member that is operably provided with respect to the housing and is capable of contacting or separating from the mating material into which the fastener is driven.
It is a driving machine equipped with
An auxiliary mechanism is provided that can switch between the addition and non-addition of the urging force in the release direction to the operating member.
The auxiliary mechanism
When the operating member operates in the additional direction, the first state in which the urging force in the releasing direction is not applied to the operating member, and
A second state in which an urging force in the release direction is applied when the operating member operates in the release direction, and
Has a driving machine. When the contact member is separated from the mating material, a return mechanism is provided to apply an operating force to the contact member to actuate the contact member with respect to the housing.
The second state of the auxiliary mechanism is a state in which an urging force in the release direction is applied to the operating member by utilizing a part of the operating force applied to the contact member from the returning mechanism. Driving machine. The auxiliary mechanism enables the operating member to operate in the additional direction while the contact member is in contact with the mating material, and the operating member is added while the contact member is separated from the mating material. The driving machine according to claim 1 or 2, which prevents the machine from operating in a direction. The drive unit has a pressure chamber formed inside the housing to supply and discharge compressed gas.
The striking portion operates in the first direction when the compressed gas is supplied to the pressure chamber, and operates in the second direction when the compressed gas is discharged from the pressure chamber.
A switching mechanism having a striking state in which the compressed gas is supplied to the pressure chamber and a non-impacting state in which the compressed gas is discharged from the pressure chamber is provided.
The driving machine according to any one of claims 1 to 3, wherein the switching mechanism switches from the non-striking state to the striking state when the operating member is operated in the additional direction. The operating member is arranged outside the housing.
The second state of the auxiliary mechanism is a state in which the compressed gas is discharged from the inside of the housing to the outside, and the kinetic energy of the compressed gas is used to apply an urging force in the release direction to the operating member. The described driving machine. The drive unit
A spring that applies elastic energy to the striking portion to operate the striking portion in the first direction,
An electric motor that stores elastic energy in the spring by operating the striking portion in the second direction, and
With
When the operating member operates in the additional direction, the electric motor operates the striking portion in the second direction.
The spring stores elastic energy when the striking portion operates in the second direction.
The driving machine according to any one of claims 1 to 3, wherein the striking portion operates in the first direction by elastic energy applied from the spring.

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