JP2019198943A - Driving machine - Google Patents

Abstract

To provide a driving machine in which replacement of the whole striking part is not required when a first engaging part is deformed.SOLUTION: A driving machine comprises: a striking part 12 which is operable in a first direction and a second direction; a first energization mechanism which operates the striking part 12 in the first direction in which the striking part can strike a fastener; and a wheel 52 which operates the striking part 12 in the second direction against energization force of the first energization mechanism. The driving machine has a rack 28 provided on the striking part 12, and a pinion 53 which is provided on the wheel 52 and is engaged with the rack 28, thereby energizing the striking part 12 in the second direction. The rack 28 can be separated from the striking part 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a driving machine including a striking portion operable in a first direction and a second direction.

  2. Description of the Related Art Conventionally, a driving machine including a driving unit operable in a first direction and a second direction is known, and the driving machine is described in Patent Document 1. The driving machine described in Patent Document 1 includes a cylinder housing, a handle, a pressure accumulating container, a cylinder, a striking part, a nose part, an electric motor, a wheel, a trigger, a battery, and a magazine. The cylinder is provided in the cylinder housing, and a pressure accumulation chamber is formed over the inside of the cylinder and the pressure accumulation container. The accumulator is filled with a compressible gas.

  The striking part has a piston and a driver blade. A first engagement portion is provided on the driver blade. The wheel has a plurality of second engaging portions arranged at intervals in the rotation direction. The first engagement portion and the second engagement portion can be engaged and released. The nose portion is fixed to the cylinder case, and the nose portion has an injection path. The magazine is attached to the nose portion and accommodates nails. The nail in the magazine is sent to the ejection path. The handle is connected to the cylinder housing, and the trigger is provided on the handle.

  In the driving machine described in Patent Document 1, when an operating force is applied to the trigger, the electric motor rotates. When the rotational force of the electric motor is transmitted to the wheel and the wheel rotates and the second engagement portion engages with the first engagement portion, the striking portion operates in the second direction against the pressure in the pressure accumulation chamber, The pressure in the accumulator rises. When the wheel further rotates and the second engaging part is released from the first engaging part, the striking part operates in the first direction by the pressure in the pressure accumulating chamber, and the striking part strikes the nail of the injection path. In the driving machine described in Patent Document 1, the first engaging portion and the second engaging portion convert the rotational force of the wheel into the operating force of the striking portion.

JP 2018-34258 A

  The inventor of the present application has recognized the problem that when the first engaging portion provided in the hitting portion is deformed, the entire hitting portion must be replaced.

  An object of the present invention is to provide a driving machine that does not require replacement of the entire striking part when the first engaging part is deformed.

  The driving machine according to an embodiment includes a striking unit operable in a first direction and a second direction opposite to the first direction, and a first striking unit that operates the striking unit in the first direction capable of striking a stopper. 1. A driving machine comprising: 1 biasing mechanism; and a second biasing mechanism that operates the striking part in the second direction against a biasing force of the first biasing mechanism, wherein the striking part A first engagement portion provided on the second urging mechanism and a second engagement for urging the striking portion in the second direction by engaging with the first engagement portion. A first engaging portion is separable from the striking portion.

  In the driving machine according to the embodiment, the first engaging portion can be removed from the striking portion.

It is the whole sectional view which looked at the driving machine which is one embodiment of the present invention from the front. It is side surface sectional drawing of the state which has the striking part provided in the driving machine in a bottom dead center. It is side surface sectional drawing of the state which has the striking part provided in the driving machine in a top dead center. It is a back sectional view showing the 2nd energizing mechanism provided in the driving machine. It is a bottom sectional view showing the 2nd energizing mechanism and reduction gear provided in the driving machine. It is a front view which shows the rack of a striking part. It is bottom sectional drawing of the nose provided in the driving machine. It is a nose provided in a driving machine, and is a front view of a state where a guide plate is in contact with a blade guide. FIG. 9 is a front view showing a state where the guide plate shown in FIG. 8 is separated from the blade guide. It is a figure which shows the other example of the driver blade and rack which comprise a striking part.

  An embodiment of a driving machine according to the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  A driving machine 10 shown in FIG. 1 includes a housing 11, a striking unit 12, a pressure accumulating chamber 13 as a first biasing mechanism, a second biasing mechanism 14, an injection unit 101, and an electric motor 15. The striking portion 12 is disposed from the inside of the housing 11 to the outside. The pressure accumulating chamber 13 operates the striking unit 12 in the first direction B1. The second urging mechanism 14 operates the striking portion 12 in the second direction B2 opposite to the first direction. It can be defined that the striking portion 12 is lowered when the striking portion 12 operates in the first direction B1. It can be defined that the hitting part 12 moves up is that the hitting part 12 operates in the second direction B2.

  The housing 11 includes a main body 16, a head cover 17, a handle 18, a motor case 19, and a connection portion 20. The head cover 17 covers the opening of the main body 16. The handle 18 and the motor case 19 are connected to the main body 16. The handle 18 and the motor case 19 are connected to the connection portion 20. An accumulator vessel 21 and a cylinder 22 are provided in the housing 11, and an annular connector 23 connects the accumulator vessel 21 and the cylinder 22. The pressure accumulation chamber 13 is formed across the pressure accumulation container 21 and the cylinder 22.

  The striking portion 12 has a piston 24, a driver blade 25, and a rack 28. The piston 24 is operable within the cylinder 22 in the direction of the center line A1 of the cylinder 22. The direction of the center line A1 is parallel to the first direction B1 and the second direction B2. The electric motor 15 is disposed around the center line A2. In FIG. 1 when the driving machine 10 is viewed from the front, the center line A1 and the center line A2 intersect at a predetermined angle, for example, intersect at an angle of 90 degrees. Further, when the driving machine 10 is viewed from the side, the center line A1 and the center line A2 do not intersect as shown in FIG. As shown in FIG. 2, a seal member 26 is attached to the outer periphery of the piston 24, and the seal member 26 contacts the inner surface of the cylinder 22 to form a seal surface. The seal member 26 hermetically seals the pressure accumulation chamber 13.

  The driver blade 25 is fixed to the piston 24. The driver blade 25 is made of metal. The driver blade 25 is operable in the direction of the center line A1. The driver blade 25 has an axial shape or a plate shape. The driver blade 25 has an engaging portion 25A. The engaging portion 25A protrudes from the driver blade 25 in a direction intersecting the center line A1.

  The rack 28 is provided separately from the driver blade 25. The rack 28 is operable in the direction of the center line A1. The rack 28 has a main body portion 28A, a convex portion 28B, a concave portion 28D, and a rib 28C.

  The main body 28A has a plate shape and is disposed in the direction of the center line A1. The main body portion 28A has a plurality of convex portions 28B and a plurality of concave portions 28D. The convex portions 28 </ b> B and the concave portions 28 </ b> D are alternately arranged in the operation direction of the rack 28. The convex portion 28B protrudes from the edge of the main body portion 28A in a direction intersecting the center line A1. The ribs 28C are provided so as to intersect the main body 28A as shown in FIG. The rib 28C is provided in the longitudinal direction of the main body portion 28A, and the notch 28G is provided in the rib 28C.

  A compressible gas is enclosed in the pressure accumulation chamber 13. The compressible gas sealed in the pressure accumulating chamber 13 can enclose an inert gas such as nitrogen gas or a rare gas in addition to air. In the present embodiment, an example in which air is sealed in the pressure accumulation chamber 13 will be described.

  1, 2, and 3 includes a nose cover 30 and a nose 31. The injection unit 101 is fixed to the main body 16. The nose cover 30 is made of an aluminum alloy or a synthetic resin. The nose cover 30 includes a bumper housing portion 32 and a wheel case 33. The bumper accommodating portion 32 and the wheel case 33 are integrated without using a connecting tool or a fixing tool. The bumper housing part 32 includes a cylinder part 34 and a load receiving part 35 connected to the cylinder part 34. The cylinder part 34 is provided surrounding the center line A1. The load receiving portion 35 protrudes from the cylindrical portion 34 so as to approach the center line A1. The load receiving portion 35 forms a shaft hole 36. The center line A1 is located in the shaft hole 36.

  The wheel case 33 has an arc shape, and the wheel case 33 is connected to the load receiving portion 35. As shown in FIG. 1, the electric motor 15 and the wheel case 33 are arranged at different positions in the direction of the center line A1. The wheel case 33 has an opening 93 shown in FIG. 5 at a position opposite to the place where the electric motor 15 is disposed in the direction of the center line A2.

  As shown in FIGS. 7, 8 and 9, the nose 31 includes a blade guide 85 and a guide plate 86. As shown in FIG. 2, the blade guide 85 is fixed to the nose cover 30 by a fixing element 37. The blade guide 85 includes an injection path 39, a guide groove 99, and a partition 87. The injection path 39 is a groove provided in parallel with the center line A1, and has a depth in the direction of the center line A2. The guide groove 99 is a groove provided in parallel with the center line A1, and has a depth in the direction of the center line A2. The injection path 39 and the guide groove 99 are arranged at an interval in a direction intersecting the center line A1.

  As shown in FIG. 7, a regulation groove 99 </ b> A is provided in the guide groove 99. The partition 87 is a wall that separates the injection path 39 and the guide groove 99. The blade guide 85 has an opening 97 connected to the injection path 39. A rack bumper 100 shown in FIG. 2 is provided in the guide groove 99. The rack bumper 100 is disposed at a position farthest from the bumper 40 in the direction of the center line A1. The rack bumper 100 is made of synthetic rubber as an example.

  The blade guide 85 and the guide plate 86 are both made of metal as an example. The blade guide 85 and the guide plate 86 are arranged side by side in the direction of the center line A2, specifically, are arranged so as to overlap in the direction of the center line A2. The guide plate 86 is attached to the blade guide 85 via the roll pin 103. The guide plate 86 is operable within a predetermined angle range with respect to the blade guide 85 with the roll pin 103 as the center. A lock lever 88 is attached to the guide plate 86 via a support shaft 89.

  The lock lever 88 is operable with respect to the guide plate 86 around the support shaft 89, that is, can be opened and closed. A locking tool 90 is provided on the lock lever 88. Further, the blade guide 85 has a hook 91, and the locking tool 90 can be engaged with and released from the hook 91. The locking tool 90 is made of metal.

  As shown in FIG. 9, a state where the locking tool 90 is released from the hook 91 and the guide plate 86 is separated from the blade guide 85 can be defined as a state where the guide plate 86 is opened.

  On the other hand, the locking tool 90 is engaged with the hook 91 at a position where the locking tool 90 is engaged with the hook 91 and the lock lever 88 is operated in a direction away from the hook, and the locking is performed. When the lock lever 88 is stopped as shown in FIG. 8 at a position where the lever 88 is moved away from the hook, the lock lever 88 is fixed by the elastic force of the locking tool 90. When the lock lever 88 is fixed, the guide plate 86 overlaps the blade guide 85 and the guide plate 86 is fixed to the blade guide 85. The state in which the guide plate 86 is fixed to the blade guide 85 can be defined as a state in which the guide plate 86 is closed.

  In the state where the guide plate 86 is closed, the driver blade 25 is disposed in the injection path 39. The driver blade 25 is prevented from moving in the third direction C1 and the fourth direction C2 by the blade guide 85 and the guide plate 86 in the bottom cross-sectional view of the nose 31 shown in FIG. In the state where the guide plate 86 is closed, the ribs 28C of the rack 28 are disposed in the restriction grooves 99A as shown in FIG.

  The rack 28 is prevented from moving in the third direction C1 and the fourth direction C2 by the blade guide 85 and the guide plate 86 in the bottom cross-sectional view of the nose 31 shown in FIG. As an example, the third direction C1 is a direction parallel to the center line A2. The fourth direction C2 is a direction that intersects the third direction C1. As an example, the fourth direction C2 is a direction that intersects the third direction C1 at an angle of 90 degrees. The driver blade 25 and the rack 28 are also prevented from moving in a direction corresponding to the third direction C1 and the fourth direction C2 in the bottom cross-sectional view of the nose 31 shown in FIG. Yes.

  A bumper 40 is provided in the load receiving portion 35. The bumper 40 can be integrally formed of a rubber elastic material, for example, a synthetic rubber such as urethane rubber or silicone rubber. The bumper 40 is an annular body having a guide hole 41. The shaft hole 36 and the guide hole 41 are connected to the injection path 39. A part of the blade guide 85 is disposed in the shaft hole 36 and the guide hole 41 as shown in FIGS.

  The driver blade 25 is operable in the direction of the center line A1 within the shaft hole 36, the guide hole 41, and the injection path 39. The bumper 40 is a mechanism that absorbs the kinetic energy of the striking portion 12 and determines the bottom dead center of the striking portion 12. When the hitting portion 12 is located at the bottom dead center, the piston 24 is in contact with the bumper 40.

  A part of the cylinder 22 in the direction of the center line A <b> 1 is disposed in the cylindrical portion 34. A female screw is provided on the inner surface of the cylindrical portion 34, and a male screw is provided on the outer surface of the cylinder 22. The cylinder portion 34 and the cylinder 22 are screwed together. A part of the bumper 40 is disposed in the cylinder 22, and the bumper 40 is sandwiched between the cylinder 22 and the load receiving portion 35 and positioned in the direction of the center line A1.

  As shown in FIG. 1, the electric motor 15 is provided in a motor case 19. The electric motor 15 includes a rotor 42 and a stator 43, and the rotor 42 is fixed to the motor shaft 44. The motor shaft 44 is rotatably supported by a bearing 84. The motor shaft 44 can rotate around the center line A2. A storage battery 45 detachably attached to the connection unit 20 is provided, and the storage battery 45 supplies power to the electric motor 15.

  The storage battery 45 accommodates a battery cell in a housing case. The battery cell is a secondary battery that can be charged and discharged, and a lithium ion battery, a nickel hydride battery, a lithium ion polymer battery, or a nickel cadmium battery can be used as the battery cell. The storage battery 45 is a DC power source. The storage case is provided with a first terminal, and the first terminal is connected to the battery cell. If a 2nd terminal is fixed to the connection part 20 and the storage battery 45 is attached to the connection part 20, a 1st terminal and a 2nd terminal will be connected so that electricity supply is possible.

  As shown in FIG. 1, a gear box 46 is provided in the housing 11. As shown in FIG. 5, the speed reducer 47 is provided in the gear box 46. The speed reducer 47 includes an input member 48, an output member 49, and three sets of planetary gear mechanisms. The input member 48 is fixed to the motor shaft 44. The input member 48 is rotatably supported by a bearing 84. The input member 48 and the output member 49 can rotate around the center line A2. The rotational force of the motor shaft 44 is transmitted to the output member 49 via the input member 48. The speed reducer 47 reduces the rotation speed of the output member 49 relative to the rotation speed of the input member 48.

  The second urging mechanism 14 converts the rotational force of the output member 49 into the operating force of the striking unit 12. The second urging mechanism 14 includes a rotation shaft 51, a wheel 52, and a conversion unit 55. The wheel 52 is attached to the rotating shaft 51. The wheel 52 can rotate together with the rotating shaft 51.

  A pinion 53 is provided on the wheel 52. The pinion 53 has a plurality of pins 80. The plurality of pins 80 are arranged at intervals in the rotation direction of the wheel 52. A gap 80 </ b> A is formed between the pins 80. The pin 80 can be engaged with and released from the convex portion 28B. The pinion 53 and the rack 28 constitute a conversion unit 55.

  A material having higher wear resistance of the material of the rack 28 than that of the material of the driver blade 25 may be used. Since a high surface pressure is generated at the engaging portion between the rack 28 and the pin 80, it is desirable to use a material with higher quenching hardness. However, since the driver blade 25 has a long overall length with respect to the rack 28, the material of the driver blade 25 can be a material with less heat treatment deformation than the material of the rack 28.

  An example of the material of the rack 28 and the driver blade 25 is tool steel. The tool steel contains at least one component of chromium, manganese, molybdenum, carbon, silicon and the like. The material of the rack 28 and the material of the pins 80 are different. For example, the pin 80 is made of a material having a quenching hardness, that is, a mechanical strength higher than that of the rack 28.

  The rotating shaft 51 is rotatably supported by bearings 56A and 56B. The rotation shaft 51 can rotate around the center line A2. The bearings 56A and 56B are arranged at an interval in the direction of the center line A2. The bearing 56 </ b> A is supported by the gear box 46, and the bearing 56 </ b> B is supported by the wheel case 33 via the holder 92.

  A rotating element 95 is attached to the rotating shaft 51. The rotating element 95 rotates integrally with the rotating shaft 51. Further, the rotating element 95 is movable together with the rotating shaft 51 in the direction of the center line A2.

  A magnet 96 is attached to the rotating element 95. In the direction of the center line A1, the bearing 56A, the rotating element 95, and the wheel 52 are disposed between the speed reducer 47 and the bearing 56B. The rotating element 95 and the wheel 52 are disposed between the bearing 56A and the bearing 56B in the direction of the center line A2. The rotation element 95 is disposed between the bearing 56A and the wheel 52 in the direction of the center line A2.

  As shown in FIG. 5, a torsion coil spring 98 is attached to the rotating element 95. The torsion coil spring 98 is made of metal as an example. The torsion coil spring 98 generates an urging force in the rotation direction of the wheel 52. As shown in FIG. 4, the end 98 </ b> A of the torsion coil spring 98 is disposed outside the wheel 52 in the radial direction of the wheel 52. The torsion coil spring 98 rotates and stops together with the rotating element 95. In FIG. 4, the rotating element 95 is omitted.

  The holder 92 is a cover that closes the opening 93 of the wheel case 33, and the holder 92 can be attached to and detached from the wheel case 33. A retaining ring 94 is attached to the wheel case 33, and the retaining ring 94 fixes the holder 92 to the wheel case 33.

  A rotation restricting mechanism 57 is provided in the gear box 46. The rotation restricting mechanism 57 is disposed in the power transmission path between the input member 48 and the output member 49. When torque is transmitted from the electric motor 15 to the input member 48, the rotation restricting mechanism 57 enables the wheel 52 to rotate counterclockwise in FIG. The rotation restricting mechanism 57 prevents the wheel 52 from rotating clockwise in FIG. 3 when the force in the first direction B1 applied to the driver blade 25 is transmitted to the wheel 52 via the rack 28.

  Further, as shown in FIG. 1, the magazine 50 is supported by the nose 31 and the housing 11. A nail 82 is accommodated in the magazine 50. The plurality of nails 82 are connected by a connecting element such as a wire or an adhesive. The magazine 50 has a feeding mechanism, and the feeding mechanism feeds the nail 82 in the magazine 50 to the injection path 39 through the opening 97.

  A control unit 83 is provided in the housing 11, for example, in the connection unit 20 and the motor case 19. The control unit 83 includes an inverter circuit and a controller. The controller is a microcomputer having an input port, an output port, an arithmetic processing unit, and a storage device. As shown in FIG. 1, a trigger 79 is provided on the handle 18. A trigger switch 54 is provided in the handle 18, and the trigger switch 54 is turned on when an operating force is applied to the trigger 79, and turned off when the operating force is released.

  As shown in FIG. 1, a push lever 81 is attached to the nose 31. The push lever 81 is operable with respect to the nose 31 in the direction of the center line A1. A push lever arm 104 is connected to the push lever 81. The push lever arm 104 is integrated with the push lever 81 and is operable in the direction of the center line A1. A magnet 105 is attached to the push lever arm 104. A position detection sensor is provided in the wheel case 33. The position detection sensor detects the magnetic field of the magnet 105 and outputs a signal when the push lever 81 is pressed against the workpiece W1 and moves a predetermined distance in the direction of the center line A1. A phase detection sensor is provided in the vicinity of the wheel case 33. The phase detection sensor detects a magnetic field formed by the magnet 96 and outputs a signal.

  The trigger switch signal, the position detection sensor signal, and the phase detection sensor signal are input to the control unit 83. The control unit 83 processes signals of the position detection sensor and the phase detection sensor to indirectly detect the movement amount of the push lever 81 and the rotation angle of the wheel 52, that is, the phase.

  Furthermore, an operation unit 106 is provided in the housing 11, and a signal from the operation unit 106 is input to the control unit 83. The operation unit 106 includes a maintenance switch and an operation mode switching switch.

  An example of an operation in which an operator uses the driving machine 10 is as follows. The operator turns on the power switch, and then selects the driving operation mode with the operation mode changeover switch. At this time, the striking part 12 is stopped at the standby position, and the piston 24 is separated from the bumper 40. Further, the pinion 53 and the rack 28 are engaged, and the end portion 28E and the engaging portion 25A are engaged. The urging force applied to the driver blade 25 from the pressure accumulation chamber 13 via the piston 24 is transmitted to the wheel 52 via the rack 28. Since the rotation restricting mechanism 57 prevents the wheel 52 from rotating, the striking portion 12 is stopped at the standby position. When the striking portion 12 is stopped at the standby position, the end portion 98 </ b> A of the torsion coil spring 98 is in contact with the inner peripheral surface of the wheel case 33.

  When the controller 83 detects that the trigger switch 54 is turned on and the push lever 81 has moved a predetermined distance, the controller 83 rotates the motor shaft 44 of the electric motor 15 forward. The torque of the motor shaft 44 is transmitted to the rotating shaft 51 via the speed reducer 47. When the wheel 52 together with the rotating shaft 51 rotates in the clockwise direction in FIG. 4, the striking unit 12 operates against the pressure in the pressure accumulating chamber 13 in the second direction B <b> 2 in FIG. .

  As shown in FIG. 3, when the pinion 53 is released from the rack 28, the striking unit 12 operates in the first direction B <b> 1 with the pressure in the pressure accumulating chamber 13. The driver blade 25 can hit the nail 82 in the injection path 39. The nail 82 is driven into the workpiece W1. The position where the piston 24 is farthest from the bumper 40 is the top dead center of the striking portion 12.

  When the driver blade 25 collides with the nail 82, the speed at which the driver blade 25 operates in the first direction B1 decreases. The rack 28 moves in the first direction B <b> 1 by inertial force after the driver blade 25 collides with the nail 82. For this reason, the end portion 28E of the rack 28 is separated from the engaging portion 25A.

  When the entire nail 82 bites into the workpiece W1 and stops, the tip of the driver blade 25 is separated from the nail 82 by the reaction force. Further, the piston 24 collides with the bumper 40 and the hitting portion 12 reaches the bottom dead center. The load receiving portion 35 receives a load applied to the bumper 40 from the striking portion 12. The bumper 40 is elastically deformed and absorbs a part of the kinetic energy of the hitting portion 12.

  Furthermore, the rack 28 that moves by inertial force collides with the rack bumper 100 before the hitting portion 12 reaches the bottom dead center, and the rack bumper 100 absorbs a part of the kinetic energy of the rack 28. Since there is a gap between the end portion 28E of the rack 28 and the engaging portion 25A, the kinetic energy of the piston 24 and the driver blade 25 is not applied to the rack bumper 100 when the rack 28 collides with the rack bumper 100. .

  The wheel 52 also rotates after the driver blade 25 hits the nail 82. The end 98A of the torsion coil spring 98 is separated from the inner peripheral surface of the wheel case 33 and enters the notch 28G as shown in FIG. At this time, there is a gap in the direction of the center line A1 between the end portion 28E of the rack 28 and the engaging portion 25A. The pinion 53 is released from the rack 28. For this reason, the rack 28 is operated in the second direction B2 by the engaging force between the end 98A of the torsion coil spring 98 and the rack 28.

  When the wheel 52 further rotates clockwise in FIG. 4, the end portion 28E of the rack 28 contacts the engaging portion 25A before the pinion 53 engages with the rack 28. Since the engagement force between the end portion 98A of the torsion coil spring 98 and the rack 28 is small, the rack 28 stops in a state where the end portion 28E of the rack 28 contacts the engagement portion 25A. Then, after the pinion 53 is engaged with the rack 28, the end portion 98 </ b> A of the torsion coil spring 98 is released from the rack 28, and the end portion 98 </ b> A contacts the inner peripheral surface of the wheel case 33. When the control unit 83 detects that the hitting unit 12 has reached the standby position based on the signal output from the phase detection sensor, the control unit 83 stops the electric motor 15.

  The operator operates the maintenance switch when replacing the rack 28. When the maintenance switch is operated, the control unit 83 causes the motor shaft 44 of the electric motor 15 to rotate forward by a predetermined number of rotations. Then, the wheel 52 rotates counterclockwise by a certain amount in FIG. 3, and the striking portion 12 slightly operates in the second direction B <b> 2 from the standby position against the pressure in the pressure accumulating chamber 13. By repeating the operation of the maintenance switch, the striking portion 12 is gradually moved in the second direction B2. When the pinion 53 is released from the rack 28, the striking unit 12 operates in the first direction B1 with the pressure of the pressure accumulating chamber 13, and the striking unit 12 stops at the bottom dead center.

  An example of an operation in which an operator takes out the rack 28 from the guide groove 99 in a state where the striking unit 12 is stopped at the bottom dead center will be described. First, the lock lever 88 shown in FIG. 8 is operated clockwise with the support shaft 89 as a fulcrum, and the locking tool 90 is released from the hook 91. Then, the guide plate 86 is operated counterclockwise with the roll pin 103 as a fulcrum, and the guide plate 86 is opened as shown in FIG.

  When the guide plate 86 is opened, a space 102 is formed between the blade guide 85 and the guide plate 86. When the guide plate 86 is open, the guide groove 99 and the space 102 are connected. An operator can take out the rack 28 from the guide groove 99.

  The operator inserts the rack 28 into the guide groove 99 after the replacement and maintenance of the rack 28 are completed. Then, the guide plate 86 is operated clockwise with the roll pin 103 as a fulcrum, and the guide plate 86 is brought into contact with the blade guide 85. Further, after the locking tool 90 is hooked on the hook 91, the lock lever 88 is operated counterclockwise with the support shaft 89 as a fulcrum, and the lock lever 88 is fixed.

  As described above, the driving machine 10 can remove the rack 28 from the injection unit 101 alone without removing the entire striking unit 12 from the injection unit 101. Further, it is not necessary to disassemble the entire injection unit 101. Therefore, when the rack 28 is deformed, the operation of replacing the rack 28 or the maintenance operation of the rack 28 can be performed in a short time and with a small number of man-hours.

  Further, the operator can remove the retaining ring 94 and the holder 92 from the wheel case 33, and then move the wheel 52 and the rotating element 95 together with the rotating shaft 51 in the direction of the center line A <b> 2 and take it out from the wheel case 33. it can. Accordingly, the wheel 52 and the rotating element 95 can be replaced and maintained.

  FIG. 10 is a diagram illustrating another example of the driver blade 25 and the rack 28 that constitute the striking unit 12. The driver blade 25 has a groove 25B. The rack 28 has an engaging portion 28F. The engaging portion 28F can enter and leave the groove 25B. The driver blade 25 and the rack 28 are provided so as to be separable.

  With the guide plate 86 closed, the driver blade 25 in FIG. 10 is located in the injection path 39 and the rack 28 is located in the guide groove 99. The engaging portion 28F is located in the groove 25B. When the driver blade 25 is operated in the direction of the center line A1, the driver blade 25 and the rack 28 are integrally operated in the direction of the center line A1 due to the engaging force between the engaging portion 28F and the driver blade 25.

  The operator can open the guide plate 86 with the striking portion 12 stopped at the bottom dead center, and remove the rack 28 from the driver blade 25. Therefore, the driving machine 10 having the driver blade 25 and the rack 28 shown in FIG. 10 can obtain the same effect as the driving machine 10 having the driver blade 25 and the rack 28 shown in FIGS. .

  An example of the technical meaning of the matters described in the present disclosure is as follows. The driving machine 10 is an example of a driving machine. The first direction B1 is an example of the first direction. The second direction B2 is an example of the second direction. The hitting unit 12 is an example of a hitting unit. The nail 82 is an example of a stopper. The pressure accumulation chamber 13 and the pressure accumulation container 21 are an example of a first urging mechanism. The rotating shaft 51 and the wheel 52 are an example of a second urging mechanism. The convex portion 28B and the concave portion 28D are examples of the first engaging portion. The pin 80 and the gap 80A are an example of a second engagement portion. The convex portion 28B and the pin 80 are an example of a convex portion. The recess 28D and the gap 80A are an example of a recess. The injection unit 101 is an example of a storage unit. The injection path 39 is an example of a first area and a second area. The guide groove 99 is an example of a third region. The blade guide 85 is an example of a main body. The guide plate 86 is an example of a movable part. The bumper 40 is an example of a first bumper. The rack bumper 100 is an example of a second bumper. The rotating shaft 51 is an example of a drive unit. The opening 93 is an example of an opening. The wheel case 33 is an example of a casing. The holder 92 is an example of a cover. Center line A2 is an example of a rotation center line.

  The driving machine is not limited to the above embodiment, and various changes can be made without departing from the scope of the driving machine. For example, the first urging mechanism can use a solid spring instead of a gas spring using a compressible gas. The solid spring includes a metal spring and a synthetic rubber spring.

  The motor that operates the striking portion in the second direction includes a hydraulic motor and a pneumatic motor in addition to the electric motor. The electric motor may be either a brush motor or a brushless motor. The power source of the electric motor may be either a DC power source or an AC power source. The rotating member includes a gear and a rotating shaft in addition to a wheel and a pulley. The standby position of the hitting unit may be any of a state where the piston is between the top dead center and the bottom dead center, a state where the piston is at the bottom dead center, and a state where the piston is at the top dead center. The deformation of the first engaging portion means that the shape is different from the original shape. The deformation of the first engagement portion includes, for example, wear, bending, bending, breakage, and cracking of the first engagement portion.

DESCRIPTION OF SYMBOLS 10 Driving machine 12 Impacting part 13 Pressure accumulating chamber 21 Pressure accumulating vessel 28A Main part 28B Convex part 28D Concave 33 Wheel case 39 Injection path 40 Bumper 51 Rotating shaft 52 Wheel 80 Pin 80A Clearance 82 Nail 85 Blade guide 86 Guide plate 92 Holder 93 Opening Part 99 Guide groove 100 Rack bumper 101 Injection part B1 1st direction B2 2nd direction

Claims (11)

A striking part operable in a first direction and a second direction opposite to the first direction, a first urging mechanism for actuating the striking part in the first direction capable of striking a stopper, and the striking part A second urging mechanism that operates in the second direction against the urging force of the first urging mechanism,
A first engagement portion provided in the striking portion;
A second engagement portion that is provided in the second urging mechanism and that engages the first engagement portion to urge the striking portion in the second direction;
Have
The first engaging portion is a driving machine that is separable from the striking portion. The second urging mechanism has a rotating element,
A plurality of the second engaging portions are provided in the rotation direction of the rotating element,
The driving device according to claim 1, wherein a plurality of the first engaging portions are provided in an operation direction of the hitting portion.   The driving machine according to claim 1, wherein at least one of the first engaging portion or the second engaging portion has a concave portion and a convex portion. An accommodating portion for accommodating the second urging mechanism is provided,
The accommodating portion is
A first region through which the stopper hit by the hitting portion passes;
A second region that operably accommodates the striking portion;
A third region that operably accommodates the first engagement portion;
The driving machine according to any one of claims 1 to 3, comprising: The accommodating portion is
The body,
A movable part that can be opened and closed with respect to the main body;
Have
The said 1st area | region, the said 2nd area | region, and the said 3rd area | region are formed between the said main body and the said movable part in the state in which the said movable part was closed with respect to the said main body. Driving machine. In a state where the movable part is opened with respect to the main body, a space is formed between the movable part and the main body,
In a state where the movable part is opened with respect to the main body, the space is connected to the third region,
The driving device according to claim 5, wherein the first engagement portion is located in the third region in a state where the movable portion is opened with respect to the main body. A first bumper that absorbs part of the kinetic energy when the striking portion is actuated in the first direction;
A second bumper that absorbs part of the kinetic energy when the first engagement portion operates in the first direction;
Are each provided, The driving machine in any one of Claims 1 thru | or 6 provided. The second urging mechanism includes a drive unit that rotates the rotating element and that is detachable from the rotating element.
The driving device according to claim 2, wherein the rotating element is detachable from the driving unit when the first engaging unit is separated from the hitting unit. A motor for rotating the drive unit;
A casing that houses the second biasing mechanism;
Is provided,
The motor and the casing are arranged at different positions in the rotation center line direction of the motor,
The second urging mechanism operates the striking portion in the second direction when a rotational force is transmitted from the motor,
The casing has an opening located opposite to the motor in the direction of the rotation center line;
A cover for opening and closing the opening is provided;
The driving machine according to claim 8, wherein when the cover closes the opening, attachment / detachment of the rotating element to / from the driving unit is restricted.   The driving machine according to any one of claims 1 to 9, wherein a strength of the first engaging portion is different from a strength of the second engaging portion.   The driving machine according to any one of claims 1 to 10, wherein a material of the first engaging portion is different from a material of the second engaging portion.

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