JP2018202519A - Driving machine - Google Patents

Abstract

To provide a driving machine which can suppress a change of striking force a striking part applies on a fastener.SOLUTION: A driving machine includes: a striking part 12 which can reciprocate between a first position and a second position, and strikes a fastener in moving in a first direction from the first position to the second position; a first biasing mechanism which moves the striking part 12 in the first direction; first positioning members 29, 32A, 32B which contact with the striking part 12 and position the striking part 12 in a direction intersecting a moving direction and in a direction rotating around the moving direction in both cases of when the striking part 12 is in a predetermined range including the first position and when the striking part 12 is out of the predetermined range between the first position and the second position; and a second positioning member 81 which contacts with the striking part 12 and positions the striking part 12 in the direction intersecting the moving direction when the striking part 12 is in the predetermined range, and separates from the striking part when the striking part 12 is out of the predetermined range.SELECTED DRAWING: Figure 9

Description

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

  A driving machine including a striking portion movable in a first direction and a second direction is described in Patent Document 1. The driving machine described in Patent Document 1 includes a housing, a motor, a compression mechanism section, a striking section, a shaft, and a bumper. The compression mechanism unit includes a final gear, a pin provided in the final gear, and a roller rotatably attached to the pin. The striking part has a plunger and a driver blade. The shaft and the bumper are provided in the housing. The plunger has a through hole, and the shaft is disposed in the through hole. A protrusion is provided on the plunger. The housing has a groove, and the plunger is provided with a rib. The rib is disposed in the groove. The plunger is movable along the shaft and the groove.

  When the final gear is rotated by the rotational force of the motor and the roller is engaged with the protrusion, the striking portion moves in the direction away from the bumper against the force of the spring, that is, in the second direction. When the striking portion moves in the second direction, the spring is compressed and the spring accumulates elastic energy. The roller is released from the protrusion as the final gear rotates, and the striking portion moves toward the bumper by the elastic energy of the spring, that is, in the first direction, and the driver blade strikes the stopper. The striking portion is positioned with respect to the housing by the shaft and the groove while moving in the first direction and the second direction.

Japanese Patent No. 5376398

  However, in order to realize a smooth movement of the striking part, the driving machine described in Patent Document 1 has a rib between the plunger and the shaft, and ribs throughout the movement in the first direction and the second direction. A large gap is formed between the groove and the inner surface of the groove. For this reason, the gap described above causes variations in the injection, that is, the timing at which the roller is released from the projection, and the position at which the roller is released from the projection fluctuates in the moving direction of the impact portion. The striking force applied to the tool could vary.

  An object of the present invention is to provide a driving machine capable of suppressing a change in hitting force applied by a hitting unit to a stopper by controlling the timing of injection with sufficient accuracy.

  The driving machine of one embodiment is capable of reciprocating between a first position and a second position, and hits a stopper when moving in the first direction from the first position toward the second position. And a first urging mechanism that moves the striking part in the first direction, the striking part being within a predetermined range including the first position; and When the striking part is outside the predetermined range between the first position and the second position, the striking part is in contact with the striking part in any direction and intersects the striking part with respect to the moving direction. And a first positioning member for positioning in a direction rotating around the moving direction, and the striking portion in contact with the striking portion when the striking portion is within the predetermined range, and intersecting the striking portion with respect to the moving direction. Before positioning in the direction and the striking part is outside the predetermined range It has a second positioning member away from the striking portion.

  In the driving machine according to an embodiment, the hitting unit is stopped by suppressing variation between the timing at which the hitting unit moves in the first direction to hit the stopper and the timing at which the weight moves in the second direction. It is possible to suppress a change in the striking force applied to the tool.

It is front sectional drawing of the driving machine which is one Embodiment of this invention. It is a partial expanded sectional view of a driving machine. It is a front view which shows the specific example 1 of the positioning mechanism provided in the driving machine. It is a figure which shows the action | operation of the striking part and weight provided in the driving machine. It is plane sectional drawing which shows the specific example 1 of a positioning mechanism. It is a figure which shows the action | operation of a striking part and a weight. It is plane sectional drawing which shows the specific example 1 of a positioning mechanism. It is a figure which shows the action | operation of a striking part and a weight. It is plane sectional drawing which shows the specific example 1 of a positioning mechanism. It is a figure which shows the action | operation of a striking part and a weight. It is a block diagram which shows the control system of a driving machine. It is a front view which shows the specific example 2 of a positioning mechanism. It is a figure which shows the action | operation of a striking part and a weight shown in FIG. It is a figure which shows the action | operation of a striking part and a weight shown in FIG. It is a top sectional view showing specific example 2 of the positioning mechanism. It is a perspective view which shows the other example of the drive mechanism provided in a driving machine. It is side surface sectional drawing which shows the drive mechanism of FIG. It is sectional drawing which shows the other example of the drive mechanism provided in a driving machine, and the specific example 3 of a positioning mechanism. It is sectional drawing which shows the other example of the drive mechanism provided in a driving machine, and the specific example 3 of a positioning mechanism.

  Hereinafter, an embodiment of a driving machine according to the present invention will be described with reference to the drawings. In the drawings, the same elements are denoted by the same reference numerals.

  A driving machine 10 illustrated in FIG. 1 includes a housing 11, a striking unit 12, a magazine 13, an electric motor 14, a drive mechanism 15, a control board 16, a battery pack 17, and a weight 18. The housing 11 includes a cylindrical main body 19, a handle 20 connected to the main body 19, and a motor case 21 connected to the main body 19. The mounting portion 22 is connected to the handle 20 and the motor case 21.

  As shown in FIG. 2, the injection part 23 is provided outside the main body part 19, and the injection part 23 is fixed to the main body part 19. A contact member 24 is attached to the injection portion 23. An injection path 25 is provided across the injection portion 23 and the contact member 24. The user presses the tip of the contact member 24 against the workpiece W1.

  The magazine 13 is supported by the housing 11 and the injection unit 23. The magazine 13 accommodates a plurality of stoppers 26. The stopper 26 includes a nail, and the material of the stopper 26 includes metal, non-ferrous metal, and steel. The stops 26 are connected to each other by a connecting element. The connecting element may be a wire, an adhesive, or a resin. The stop 26 is rod-shaped. The magazine 13 has a feeder. The feeder sends the stopper 26 accommodated in the magazine 13 to the injection path 25. The contact member 24 guides the driving position of the stopper 26, the posture of the stopper 26, and the driving direction of the stopper 26.

  The striking portion 12 is provided over the inside and outside of the main body portion 19. The striking portion 12 includes a metal or synthetic resin plunger 27 disposed in the main body portion 19, and a metal driver blade 28 fixed to the plunger 27. A plunger shaft 29 is provided in the main body 19. A top holder 30 and a bottom holder 31 shown in FIGS. 2 and 3 are fixedly provided in the housing 11. The plunger shaft 29 is fixed to the top holder 30 and the bottom holder 31. As shown in FIGS. 4 to 10, two guide bars 32A and 32B are provided. The guide bars 32 </ b> A and 32 </ b> B are disposed in the main body 19 and are fixed to the top holder 30 and the bottom holder 31. The guide bars 32 </ b> A and 32 </ b> B are both plate-shaped and are arranged in parallel with the axis A <b> 1 of the plunger shaft 29.

  As shown in FIGS. 5, 7, and 9, the guide bar 32A is provided with a guide hole 77, and the guide bar 32B is provided with a guide hole 78. The guide holes 77 and 78 are disposed in parallel with the axis A1. When the guide bars 32A and 32B are viewed in a plane cross section, the axis A1 is positioned on the axis A3 in the width direction of the guide holes 77 and 78.

  As shown in FIG. 9, the guide bar 32 </ b> A has a contact portion 81, and the guide bar 32 </ b> B has a contact portion 82. As shown in FIGS. 3, 6, 8, and 10, the contact portions 81 and 82 are disposed between the top holder 30 and the bottom holder 31 in the direction of the axis A1. The contact parts 81 and 82 are arranged at different positions in the direction of the axis A1. The contact portion 82 is disposed between the top holder 30 and the contact portion 81 in the direction of the axis A1. As shown in FIG. 9, the contact portion 81 protrudes from the guide bar 32A in the direction of the axis E1, and the contact portion 82 protrudes from the guide bar 32B in the direction of the axis E1. The axis E1 passes through the axis A1 and intersects the axis A3 at a right angle. The axis E1 is located between the contact part 81 and the contact part 82.

  The contact portion 81 has a protrusion 81A, and the contact portion 82 has a protrusion 82A. The protrusion 81A protrudes from the contact portion 81 in a direction approaching the contact portion 82 in the direction of the axis A3. The protrusion 82A protrudes from the contact portion 82 in a direction approaching the contact portion 81 in the direction of the axis A3. In the direction of the axis A3, the distance between the protrusion 81A and the protrusion 82A is smaller than the distance between the guide bar 32A and the guide bar 32B. The protrusion 81A and the protrusion 82A may be provided on the weight 18 and the plunger 27.

  The contact portions 81 and 82 and the protrusions 81A and 82A are preferably made of a low friction material having a friction coefficient smaller than that of the metal material. The low friction material includes, for example, a self-lubricating resin, a metal material subjected to a coating process, and a metal material impregnated with a lubricant. The self-lubricating resin includes polyacetal (Polyoxymethylene: POM) resin and fluororesin. The coating process applied to the metal material includes a coating process of a self-lubricating resin or a solid lubricating film. Further, the coating process includes a coating process and a plating process.

  The plunger 27 has a through hole 27A, and the plunger shaft 29 is disposed in the through hole 27A. The plunger 27 is movable along the plunger shaft 29 in the direction of the axis A1. The plunger 27 is disposed between the guide bar 32A and the guide bar 32B in the direction of the axis A3. The plunger 27 has protrusions 79 and 80. The protrusion 79 is disposed in the guide hole 77, and the protrusion 80 is disposed in the guide hole 78. When the plunger 27 moves in the direction of the axis A <b> 1, the protrusion 79 moves in the guide hole 77, and the protrusion 80 moves in the guide hole 78.

  The plunger shaft 29 has a function of positioning the plunger 27 in the radial direction around the axis A1 and moving the plunger 27 in a straight line. As shown in FIGS. 5, 7, and 9, the guide bars 32 </ b> A and 32 </ b> B have a function of positioning the plunger 27 in the rotational direction about the axis A <b> 1 and the plunger 27 in the plane cross section perpendicular to the axis A <b> 1. And a function of positioning in the direction of the axis A3.

  The driver blade 28 can move in parallel with the axis A <b> 1 together with the plunger 27, and moves in the main body 19 and the injection path 25.

  The weight 18 suppresses the reaction that the housing 11 receives. The material of the weight 18 may be any of metal, non-ferrous metal, steel, and ceramic. The weight 18 has a through hole 83, and the plunger shaft 29 is disposed in the through hole 83. The plunger shaft 29 supports the weight 18 so as to be movable in the direction of the axis A1. The plunger shaft 29 has a function of positioning the weight 18 in the radial direction with respect to the axis A1. The weight 18 has two protrusions 84. FIG. 3 shows only one protrusion 84 for convenience. The two protrusions 84 are disposed in the guide holes 77 and 78, respectively. When the weight 18 moves along the plunger shaft 29 in the direction of the axis A1, the two protrusions 84 move in the guide holes 77 and 78 in the direction of the axis A1.

  As shown in FIG. 9, the guide bars 32A and 32B have a function of positioning the weight 18 in the rotational direction around the axis A1 and a weight 18 in the direction of the axis A3 in a plane cross section perpendicular to the axis A1. And having a function.

  A spring 33 is disposed in the main body 19, and the spring 33 is disposed between the plunger 27 and the weight 18 in the direction of the axis A <b> 1. The spring 33 is a metal compression coil spring and can expand and contract in the direction of the axis A1. As the material of the spring 33, metal, non-ferrous metal, or ceramic can be used. The spring 33 receives the compressive force in the direction of the axis A1 and accumulates elastic energy. The spring 33 is a specific example of a first urging mechanism and a third urging mechanism provided in the driving machine 10.

  As shown in FIG. 2, a weight bumper 34 and a plunger bumper 35 are provided in the main body 19. The weight bumper 34 is disposed between the top holder 30 and the weight 18, and the plunger bumper 35 is disposed between the bottom holder 31 and the plunger 27. Both the weight bumper 34 and the plunger bumper 35 are made of synthetic rubber.

  The plunger 27 receives an urging force in the first direction D1 approaching the bottom holder 31 in the direction of the axis A1 from the spring 33. The weight 18 receives an urging force in the second direction D2 approaching the top holder 30 in the direction along the axis A1 from the spring 33. The first direction D1 and the second direction D2 are opposite to each other, and the first direction D1 and the second direction D2 are parallel to the axis A1. The plunger 27 and the weight 18 receive a biasing force from a common spring 33.

  The driving machine 10 shown in FIGS. 1 and 2 shows an example in which the axis A1 is parallel to the vertical line. The movement of the striking portion 12 or the plunger 27 or the weight 18 in the first direction D1 is referred to as lowering. In FIG. 1, the movement of the striking portion 12 or the plunger 27 or the weight 18 in the second direction D2 is called ascending. The striking portion 12 and the weight 18 can reciprocate in the direction of the axis A1.

  The battery pack 17 shown in FIG. 1 can be attached to and detached from the mounting portion 22. The battery pack 17 has a storage case and a plurality of battery cells stored in the storage 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 battery pack 17 is a DC power source, and the electric power of the battery pack 17 can be supplied to the electric motor 14.

  The control board 16 shown in FIG. 1 is provided in the mounting portion 22, and the controller 37 and the inverter circuit 38 shown in FIG. 11 are provided on the control board 16. The controller 37 is a microcomputer having an input port, an output port, and a storage unit. The inverter circuit 38 has a switching element. The inverter circuit 38 connects and disconnects an electric circuit formed between the battery pack 17 and the electric motor 14.

  As shown in FIG. 1, a trigger 39 and a trigger switch 40 are provided on the handle 20. The trigger switch 40 is turned on when the user applies an operating force to the trigger 39, and the trigger switch is released when the operating force applied to the trigger 39 is released. 40 turns off. A position detection sensor 41 is provided in the main body 19. The position detection sensor 41 detects the position of the weight 18 in the direction of the axis A1 and outputs a signal. The controller 37 receives the signal of the trigger switch 40 and the signal of the position detection sensor 41 and controls the inverter circuit 38.

  The electric motor 14 has a rotor and a stator, and a motor shaft 42 is connected to the rotor. When electric power is supplied from the battery pack 17 to the electric motor 14, the motor shaft 42 rotates. A reduction gear 43 is disposed in the motor case 21. As shown in FIG. 2, the speed reducer 43 includes a sun gear 44, a ring gear 45, and a carrier 46. The ring gear 45 is provided so as not to rotate, and the sun gear 44 rotates together with the motor shaft 42. A pinion gear 47 that meshes with the sun gear 44 and the ring gear 45 is provided, and the carrier 46 supports the pinion gear 47 so that it can rotate and revolve. The carrier 46 can rotate integrally with the drive shaft 48 about the axis A2. A drive gear 49 is provided on the outer peripheral surface of the drive shaft 48.

  The drive mechanism 15 shown in FIG. 2 converts the rotational force of the drive shaft 48 into the moving force of the striking portion 12 and the moving force of the weight 18. The drive mechanism 15 includes a first gear 50, a second gear 51, and a third gear 52 as shown in FIGS. The first gear 50 is engaged with the drive gear 49. The first gear 50 is rotatably supported by the first support shaft 53. The second gear 51 is rotatably supported by the second support shaft 54. The third gear 52 is rotatably supported by the third support shaft 55. A gear holder 56 is fixedly provided in the housing 11, and the first support shaft 53, the second support shaft 54, and the third support shaft 55 are attached to the gear holder 56. The first gear 50 rotates about the axis B1, the second gear 51 rotates about the axis B2, and the third gear 52 rotates about the axis B3.

  As shown in FIG. 4, the axes B1, B2, and B3 are arranged side by side in the direction of the axis A1. The axis B2 is disposed between the axis B1 and the axis B3. The outer diameter of the first gear 50 and the outer diameter of the third gear 52 are the same, and the outer diameter of the second gear 51 is smaller than the outer diameter of the first gear 50 and the outer diameter of the third gear 52. The second gear 51 meshes with the first gear 50 and the third gear 52.

  Cam rollers 57 and 58 are provided on the first gear 50, and a cam roller 59 is provided on the third gear 52. The cam rollers 57 and 58 protrude from the first gear 50 in the direction of the axis B1. The cam roller 59 protrudes from the third gear 52 in the direction of the axis B3. The cam rollers 57 and 58 are arranged on the same circumference around the axis B1. The diameters of the cam rollers 57, 58, 59 are all the same.

  Cam rollers 57, 58 provided on the first gear 50 can rotate with respect to the first gear 50, and the cam rollers 57, 58 are arranged at an interval of 90 degrees in the rotation direction of the first gear 50. . The cam roller 59 provided on the third gear 52 can rotate with respect to the third gear 52.

  When the electric power of the battery pack 17 is supplied to the electric motor 14 and the motor shaft 42 rotates forward, the rotational force of the motor shaft 42 is transmitted to the first gear 50 via the speed reducer 43. When the rotational force of the electric motor 14 is transmitted to the first gear 50, the first gear 50 rotates clockwise in FIG. The second gear 51 rotates counterclockwise, and the third gear 52 rotates clockwise.

  As shown in FIG. 3, the plunger arm portion 61 is provided on the plunger 27. The plunger arm portion 61 is movable together with the plunger 27 in the direction of the axis A1. The plunger arm portion 61 is made of metal, and the plunger arm portion 61 has engaging portions 62 and 63. The engaging portions 62 and 63 protrude from the plunger arm portion 61 in the direction of the axis E1. The engaging portions 62 and 63 are arranged at different positions in the direction of the axis A1. Regardless of the position of the plunger 27 in the direction of the axis A1, the engaging portion 63 is disposed between the engaging portion 62 and the top holder 30 in the direction of the axis A1. When the first gear 50 rotates, the cam roller 57 can be engaged with and released from the engaging portion 63. When the first gear 50 rotates, the cam roller 58 can be engaged with and released from the engaging portion 63.

  A weight arm portion 65 is provided on the weight 18. The weight arm portion 65 protrudes from the weight 18 in the direction of the axis E1. When the third gear 52 rotates, the cam roller 59 can be engaged with and released from the weight arm portion 65.

  As shown in FIG. 1, a rotation restricting mechanism 66 is provided in the motor case 21. When the counterclockwise rotational force of the first gear 50 shown in FIG. 4 is transmitted to the drive gear 49, the rotation restricting mechanism 66 prevents the motor shaft 42 from rotating reversely by the rotational force.

  Next, a usage example of the driving machine 10 will be described. When the controller 37 detects that the trigger switch 40 is turned off, the controller 37 supplies power to the electric motor 14 and stops the motor shaft 42. Here, in the drive mechanism 15, as shown in FIG. 6, the cam roller 58 is engaged with the engaging portion 62, and the cam roller 57 is released from the engaging portion 63. The cam roller 59 is engaged with the weight arm portion 65.

  The controller 37 processes the signal from the position detection sensor 41 to estimate the positions of the plunger 27 and the weight 18 in the direction of the axis A1. The controller 37 stops the electric motor 14 in a state where the plunger 27 is separated from the plunger bumper 35 and the weight 18 is separated from the weight bumper 34.

  When the plunger 27 is separated from the plunger bumper 35, the plunger 27 receives a biasing force in the first direction D <b> 1 from the spring 33. Part of the urging force in the first direction D1 received by the plunger 27 is transmitted to the first gear 50 via the engaging portion 62 and the cam roller 58, and the first gear 50 receives the counterclockwise rotational force in FIG. . Part of the urging force in the first direction D <b> 1 received by the plunger 27 is transmitted to the third gear 52 via the weight arm portion 65 and the cam roller 59. The third gear 52 receives a counterclockwise rotational force in FIG. The rotational force received by the third gear 52 is transmitted to the first gear 50 via the second gear 51, and the first gear 50 receives the counterclockwise rotational force in FIG.

  The rotation restricting mechanism 66 prevents the motor shaft 42 of the electric motor 14 from rotating in the reverse direction. For this reason, the first gear 50 and the third gear 52 are maintained in a stopped state. In this way, the plunger 27 is held at a position away from the plunger bumper 35, that is, at a standby position. Further, the weight 18 is stopped at a position away from the weight bumper 34, that is, at a standby position.

  Further, when the plunger 27 is stopped at the standby position, the contact portion 81 is separated from the plunger arm portion 61. When the weight 18 is stopped at the standby position, the contact portion 82 is separated from the weight arm portion 65.

  When the user presses the tip of the contact member 24 against the workpiece W1 and the controller 37 detects that the trigger switch 40 is turned on, the controller 37 supplies power to the electric motor 14 and rotates the motor shaft 42 in the forward direction. The rotational force of the motor shaft 42 is amplified by the speed reducer 43 and transmitted to the drive gear 49, and the first gear 50 rotates clockwise in FIG.

  When the first gear 50 rotates clockwise, the second gear 51 rotates counterclockwise, and the third gear 52 rotates clockwise. For this reason, the plunger 27 moves in the second direction D <b> 2 against the urging force of the spring 33. That is, the striking part 12 rises. Further, the weight 18 moves in the first direction D1. That is, the weight 18 is lowered.

  Then, as shown in FIG. 9, after the protrusion 81 </ b> A of the contact portion 81 contacts the plunger arm portion 61, the striking portion 12 reaches the top dead center as shown in FIG. 8. Of the plunger arm portion 61 shown in FIG. 9, the portion 61A where the projection 81A contacts is parallel to the axis E1. Further, as shown in FIG. 9, after the contact portion 82 comes into contact with the weight arm portion 65, the weight 18 reaches the bottom dead center as shown in FIG. As shown in FIG. 9, in the weight arm portion 65, the portion 65A where the protrusion 82A contacts is parallel to the axis E1. The top dead center of the hitting portion 12 is a position where the hitting portion 12 is farthest from the plunger bumper 35. The bottom dead center of the weight 18 is a position where the weight 18 is farthest from the weight bumper 34.

  When the first gear 50 further rotates clockwise in FIG. 8, the cam roller 58 is released from the engaging portion 62, and the striking portion 12 is lowered by the urging force of the spring 33 as shown in FIG. Further, when the third gear 52 further rotates clockwise in FIG. 8, the cam roller 59 is released from the weight arm portion 65, and the weight 18 is lifted by the urging force of the spring 33 as shown in FIG. Here, after the cam roller 58 is released from the engaging portion 62, the contact portion 81 is separated from the plunger arm portion 61. Further, after the cam roller 59 is separated from the weight arm portion 65, the contact portion 82 is separated from the weight arm portion 65.

  When the striking portion 12 is lowered in this manner, the driver blade 28 strikes the stopper 26, and the stopper 26 is driven into the workpiece W1. Further, the plunger 27 collides with the plunger bumper 35 as shown in FIGS. 2 and 4, and the striking portion 12 stops at the bottom dead center. The weight 18 collides with the weight bumper 34 as shown in FIGS. 2 and 4, and the weight 18 stops at the top dead center. Specifically, after the hitting unit 12 reaches the bottom dead center, the weight 18 reaches the bottom dead center. Thus, since the weight 18 moves in the direction opposite to the striking portion 12 when the striking portion 12 descends, vibration and reaction of the housing 11 can be reduced. That is, the weight 18 is a reaction reduction mechanism. When the striking portion 12 stops at the bottom dead center, the contact portion 81 is separated from the plunger arm portion 61. Further, when the weight 18 stops at the top dead center, the contact portion 82 is separated from the weight arm portion 65.

  After the stop 26 is driven into the driven material W1, the controller 37 rotates the electric motor 14 forward even after the user moves the contact member 24 away from the driven material W1 and the trigger switch 40 is turned off. . When the cam roller 57 engages with the engaging portion 63, the striking portion 12 rises from the bottom dead center against the urging force of the spring 33, and the plunger 27 moves away from the plunger bumper 35.

  Further, when the first gear 50 rotates, the cam roller 58 is engaged with the engaging portion 62 while the cam roller 57 is engaged with the engaging portion 63. Next, the cam roller 57 is released from the engaging portion 63, and the striking portion 12 is raised by the force transmitted to the plunger 27 via the cam roller 58. Further, the rotation of the third gear 52 causes the cam roller 58 to engage with the weight arm portion 65, and the weight 18 descends from the top dead center. When the controller 37 detects that the plunger 27 has reached the standby position as shown in FIG. 6, the controller 37 stops the electric motor 14.

  In the present embodiment, the plunger shaft 29 and the guide bars 32A and 32B position the striking portion 12 in the radial direction with respect to the axis A1 regardless of the position of the striking portion 12 in the direction of the axis A1. In particular, the positioning is performed in the directions of the axes E1 and A3. Further, the guide bars 32A and 32B position the striking portion 12 in the rotation direction about the axis A1, regardless of the position of the striking portion 12 in the direction of the axis A1. That is, the guide bars 32 </ b> A and 32 </ b> B have a function of preventing the hitting portion 12 from rotating.

  Further, when the striking portion 12 is in a predetermined range including the top dead center as shown in FIG. 8, the contact portion 81 contacts the plunger arm portion 61 as shown in FIG. 9, and the striking portion 12 is centered on the axis A1. Prevents rotating around. Further, when the striking portion 12 is within a predetermined range including the top dead center, the contact portion 81 contacts the plunger arm portion 61 and positions the striking portion 12 in the direction of the axis A3. For this reason, when the cam roller 58 moves away from the engaging portion 62, the striking portion 12 rotates clockwise about the axis A1 in FIG. 9 due to the reaction force of the contact portion between the cam roller 58 and the engaging portion 62. It can suppress and it can suppress that the striking part 12 moves to an axis line A3 direction.

  Furthermore, since the contact part 81 is comprised with a material with a small friction coefficient, the contact resistance at the time of the contact part 81 being pressed on the plunger arm part 61 can be reduced. Therefore, when the cam roller 58 is released from the engaging portion 62, the striking portion 12 can move smoothly in the direction of the axis A1.

  That is, when the cam roller 58 is released from the engaging portion 62, it is possible to suppress the change of the position of the striking portion 12 in the direction of the axis A1. Therefore, regardless of the conditions for positioning the striking portion 12, it is possible to suppress the striking force applied from the striking portion 12 to the stopper 26 from changing each time a striking is performed. Conditions for positioning the striking portion 12 include variations in the dimensions of parts, assembly errors between parts, and the like. The conditions for positioning the striking portion 12 include the inner diameter of the through-hole 27A, the outer diameter of the plunger shaft 29, the distance between the guide bar 32A and the guide bar 32B in the direction of the axis A3, the width of the guide holes 77 and 78 in the direction of the axis E1, and the axis The positional relationship between the guide hole 77 and the guide hole 78 in the E1 direction, the width of the projections 79 and 80 in the axis E1 direction, the positional relationship between the projection 79 and the projection 80 in the axis E1 direction, and the width of the plunger 27 in the axis A3 direction are included. .

  The predetermined range of the hitting unit 12 includes the following meanings, for example. The predetermined range example 1 of the striking portion 12 is that the striking portion 12 is in the axial line in FIG. 8 while the load F1 in the direction of the axis A3 is applied to the striking portion 12 by the engagement of the cam roller 58 and the engaging portion 62 shown in FIG. This is the range that moves in the A1 direction. The predetermined range example 2 of the hitting portion 12 is shown in FIG. 8 while a counterclockwise load F2 centering on the axis A1 is applied to the hitting portion 12 by the engagement of the cam roller 58 and the engaging portion 62 shown in FIG. In this range, the striking portion 12 moves in the direction of the axis A1. The loads F1 and F2 include component forces.

  Further, when the striking portion 12 is outside the predetermined range, the contact portion 81 is separated from the plunger arm portion 61. For this reason, it can suppress that the movement resistance at the time of the striking part 12 moving in the 2nd direction D2 increases. Moreover, it can suppress that the movement resistance at the time of the striking part 12 moving in the 1st direction D1 increases. Accordingly, it is possible to suppress a decrease in the striking energy that the striking portion 12 applies to the stopper.

  Further, the plunger shaft 29 positions the weight 18 in the radial direction around the axis A1 regardless of the position of the weight 18 in the direction of the axis A1. In particular, the weight 18 is positioned in the directions of the axes E1 and A3 in FIG. The guide bars 32A and 32B position the weight 18 in the rotational direction about the axis A1 regardless of the position of the weight 18 in the direction of the axis A1. That is, the guide bars 32A and 32B have a function of preventing the weight 18 from rotating.

  On the other hand, when the weight 18 is within a predetermined range including the bottom dead center, the contact portion 82 contacts the weight arm portion 65 as shown in FIG. 9, and the weight 18 rotates counterclockwise about the axis A1. Prevents rotation. Further, when the weight 18 is out of the predetermined range, the contact portion 82 contacts the weight arm portion 65 as shown in FIG. 9, and positions the weight 18 in the direction of the axis A3. For this reason, when the cam roller 59 is released from the weight arm portion 65, the weight 18 rotates counterclockwise about the axis A1 in FIG. 9 by the reaction force at the contact portion between the cam roller 59 and the weight arm portion 65. This can be suppressed, and the movement of the weight 18 in the direction of the axis A3 can be suppressed.

  If the contact part 82 is comprised with a low friction material, the contact resistance at the time of the contact part 82 being pressed on the weight arm part 65 can be reduced. Therefore, when the cam roller 59 is released from the weight arm portion 65, the weight 18 can be smoothly moved in the direction of the axis A1.

  That is, it is possible to suppress the fluctuation of the position of the weight 18 in the direction of the axis A1 when the cam roller 59 is separated from the weight arm portion 65. That is, regardless of the conditions for positioning the striking portion 12 and the conditions for positioning the weight 18, the timing at which the striking portion 12 moves from the top dead center toward the bottom dead center and the weight 18 from the bottom dead center to the top dead center. It is possible to suppress a change in the timing of moving toward the head. Therefore, it is possible to suppress a decrease in the recoil reduction function of the weight 18.

  The predetermined range of the weight 18 includes the following meanings, for example. The predetermined range example 1 of the weight 18 is a range in which the weight 18 moves in the direction of the axis A1 in FIG. 8 while the load F3 in the direction of the axis A3 is applied to the weight 18 due to the engagement of the cam roller 59 and the weight arm portion 65. is there. In the predetermined range example 2, the weight 18 moves in the direction of the axis A1 in FIG. 8 while the clockwise load F4 centered on the axis A1 is applied to the weight 18 by the engagement of the cam roller 59 and the weight arm 65. It is a range. The loads F3 and F4 include a component force.

  Conditions for positioning the weight 18 include variations in the dimensions of parts, assembly errors between parts, and the like. The conditions for positioning the weight 18 include the inner diameter of the through hole 83, the outer diameter of the plunger shaft 29, the distance between the guide bar 32A and the guide bar 32B in the direction of the axis A3, the width of the guide holes 77 and 78 in the direction of the axis E1, and the axis E1. The positional relationship between the guide hole 77 and the guide hole 78 in the direction, the width of the protrusion 84 in the direction of the axis E1, the positional relationship of the protrusions 80 in the direction of the axis E1, and the width of the weight 18 in the direction of the axis A3.

  Further, when the weight 18 is outside the predetermined range, the contact portion 82 is released from the weight arm portion 65. For this reason, it can suppress that the movement resistance at the time of the weight 18 moving in the 1st direction D1 and the 2nd direction D2 increases.

  Next, another example of a mechanism for positioning the striking portion 12 and the weight 18 will be described with reference to FIGS. In the elements shown in FIGS. 12 to 15, the same elements as those in FIGS. 1 to 10 are denoted by the same reference numerals as those in FIGS. The elements and mechanisms shown in FIGS. 12 to 15 can be provided in the housing 11 of FIGS. 1 and 2. The guide bar 32A has a wide portion 86 in which the width in the direction of the axis E1 is wider than other portions. An opening 87 that penetrates the wide portion 86 in the direction of the axis A3 is provided. The opening 87 is disposed between the guide bar 32A and the first gear 50 in the direction of the axis E1.

  Arms 88 are connected to both ends of the wide portion 86 in the direction of the axis E1. The arm portion 88 supports the shaft 89. In the plan sectional view of the plunger 27 shown in FIG. 15, the axis B4 of the shaft 89 is parallel to the axis E1. A roller 90 is attached to the shaft 89. The roller 90 can rotate around the axis B4. The roller 90 is disposed between the arm portion 88 and the arm portion 88 in the direction of the axis E1. A part of the roller 90 is disposed in the opening 87, and a part of the outer peripheral surface of the roller 90 protrudes from the surface of the wide part 86.

  The guide bar 32B has a wide portion 91 whose width in the direction of the axis E1 is wider than other portions. As shown in FIG. 12, the wide portion 91 is disposed at a position different from the wide portion 86 in the direction of the axis A1. The wide portion 91 is disposed between the wide portion 86 and the top holder 30 in the direction of the axis A1. An opening 92 that penetrates the wide portion 91 in the direction of the axis A3 is provided. The opening 92 is disposed between the guide bar 32B and the first gear 50 in the direction of the axis E1.

  Arms 93 are connected to both ends of the wide portion 91 in the direction of the axis E1. The arm portion 93 supports the shaft 94. In the plan sectional view of the plunger 27 shown in FIG. 15, the axis B5 of the shaft 94 is parallel to the axis E1. A roller 95 is attached to the shaft 94. The roller 95 can rotate around the axis B5. The roller 95 is disposed between the arm portion 93 and the arm portion 93 in the direction of the axis E1. A part of the roller 95 is disposed in the opening 92, and a part of the outer peripheral surface of the roller 95 protrudes from the surface of the wide part 91.

  In FIG. 13, when the first gear 50 rotates clockwise, the cam roller 57 is engaged with and released from the engaging portion 62 and the cam roller 58 is engaged according to the same principle as described with reference to FIGS. The portion 63 is engaged and released. The striking unit 12 moves in the second direction D2 and the first direction D1, and the striking unit 12 stops at the standby position and the bottom dead center. When the striking portion 12 moves in the first direction D1, the driver blade 28 strikes the stopper 26. The weight 18 moves in the first direction D1 and the second direction D2, and stops at the standby position and the top dead center. The weight 18 moves in the opposite direction to the striking portion 12 and suppresses the reaction of the housing 11.

  In the example shown in FIGS. 12 to 15, when the striking portion 12 moves in the first direction D1 and the second direction D2, if the striking portion 12 is within a predetermined range including the top dead center, a roller as shown in FIG. The outer peripheral surface of 90 contacts the location 61A of the plunger arm portion 61, and prevents the striking portion 12 from rotating clockwise about the axis A1. Further, the roller 90 contacts the location 61A of the plunger arm portion 61, and positions the striking portion 12 in the direction of the axis A3. For this reason, when the cam roller 58 is released from the engaging portion 62, the striking portion 12 rotates clockwise around the axis A1 in FIG. 15 by the reaction force of the contact portion between the cam roller 58 and the engaging portion 62. This can be suppressed, and the striking part 12 can be prevented from moving in the direction of the axis A3.

  Furthermore, the striking portion 12 comes into contact with the roller 90 to be in a rolling friction state, and the frictional resistance at the contact portion between the striking portion 12 and the roller 90 can be suppressed. For this reason, when the hit | damage part 12 moves within the predetermined range containing a top dead center, it can suppress that the movement resistance of the hit | damage part 12 increases. Therefore, it is possible to suppress the impact force applied from the impact portion 12 to the stopper 26 from being changed for each impact based on the same principle as that described with reference to FIGS.

  Further, when the striking portion 12 is outside the predetermined range, the roller 90 is released from the plunger arm portion 61. For this reason, it can suppress that the movement resistance at the time of the striking part 12 moving in the 2nd direction D2 increases. Moreover, it can suppress that the movement resistance at the time of the striking part 12 moving in the 1st direction D1 increases. Accordingly, it is possible to suppress a decrease in the striking energy that the striking portion 12 applies to the stopper.

  When the weight 18 is within a predetermined range including the bottom dead center, the roller 95 comes into contact with the portion 65A of the weight arm portion 65 as shown in FIG. 15, and the weight 18 rotates counterclockwise about the axis A1. Prevents rotation. Therefore, when the cam roller 59 is released from the weight arm portion 65, the weight 18 rotates counterclockwise about the axis A1 in FIG. 15 by the reaction force at the contact portion between the cam roller 59 and the weight arm portion 65. It is possible to prevent the weight 18 from moving in the direction of the axis A3.

  Further, the weight 18 comes into contact with the roller 95 to be in a rolling friction state, and the frictional resistance at the contact point between the weight 18 and the roller 95 can be suppressed. Therefore, when the weight 18 moves within a predetermined range including the bottom dead center, an increase in the movement resistance of the weight 18 can be suppressed.

  That is, when the cam roller 59 is released from the weight arm portion 65, it is possible to suppress the change in the position of the weight 18 in the direction of the axis A1. That is, regardless of the conditions for positioning the striking portion 12 and the conditions for positioning the weight 18, the timing at which the striking portion 12 moves from the top dead center toward the bottom dead center and the weight 18 from the bottom dead center to the top dead center. It is possible to suppress a change in the timing of moving toward the head. Therefore, it is possible to suppress a decrease in the recoil reduction function of the weight 18.

  When the weight 18 is out of the predetermined range, the roller 95 is released from the weight arm portion 65. For this reason, it can suppress that the movement resistance at the time of the weight 18 moving in the 1st direction D1 and the 2nd direction D2 increases.

  In the examples shown in FIGS. 12 to 15, the meaning of the predetermined range of the hitting portion 12 and the meaning of the predetermined range of the weight 18 are the meaning of the predetermined range of the hitting portion 12 and the predetermined range of the weight 18 described in FIGS. 2 to 10. The meaning of the range is the same.

  16 and 17 show another example of the drive mechanism. The drive mechanism 70 includes a first pulley 71, a second pulley 72, and a belt 73. The first pulley 71 is supported by a support shaft 74, and the second pulley 72 is supported by a support shaft 75. The support shafts 74 and 75 are attached to the holder 76. The holder 76 is provided in the housing 11. The first pulley 71 can rotate about the axis B4, and the second pulley 72 can rotate about the axis B5. The axes B4 and B5 are disposed on the axis A1. The axis B4 and the axis B5 are parallel.

  Cam rollers 57 and 58 are provided on the first pulley 71, and cam rollers 59 and 60 are provided on the second pulley 72. The cam rollers 57 and 58 are arranged on an imaginary circle C1 centered on the axis B4. The cam rollers 59 and 60 are disposed on an imaginary circle C2 centered on the axis B5. The belt 73 is annular, and the belt 73 is wound around the first pulley 71 and the second pulley 72. The first pulley 71 can be rotated clockwise by the rotational force of the drive shaft 48. When the first pulley 71 rotates clockwise in FIG. 17, the rotational force is transmitted to the second pulley 72 via the belt 73, and the second pulley 72 rotates clockwise.

  When the first pulley 71 rotates clockwise in FIG. 17, the cam roller 57 is engaged and released with the engaging portion 63, and the cam roller 58 is engaged and released with the engaging portion 62. When the second pulley 72 rotates clockwise in FIG. 17, the cam roller 60 is engaged and released with the engaging portion 64, and the cam roller 59 is engaged and released with the weight arm portion 65. For this reason, when the drive mechanism 70 is provided in place of the drive mechanism 15 of FIGS. 1 and 2, the striking portion 12 is raised and lowered, and the weight 18 is lowered and raised. Even when the drive mechanism 70 is used, the same effect as when the drive mechanism 15 is used can be obtained.

  Then, when the striking portion 12 shown in FIG. 17 is within a predetermined range including the top dead center, the protrusion 81 </ b> A of the contact portion 81 contacts the location 61 </ b> A of the plunger arm portion 61 as shown in FIGS. 8 and 9. Therefore, the striking part 12 can be positioned on the same principle as the embodiment of FIGS. When the striking portion 12 is outside the predetermined range, the protrusion 81A of the contact portion 81 is separated from the plunger arm portion 61.

  Further, when the weight 18 shown in FIG. 17 is within a predetermined range including the bottom dead center, the protrusion 82A of the contact portion 82 contacts the portion 65A of the weight arm portion 65 as shown in FIGS. Therefore, the weight 18 can be positioned based on the same principle as that of the embodiment shown in FIGS. Further, when the weight 18 shown in FIG. 17 is outside the predetermined range, the protrusion 82 </ b> A of the contact portion 82 is separated from the weight arm portion 65.

  18 and 19 are cross-sectional views showing other structural examples of the driving machine. The driving machine 190 shown in FIGS. 18 and 19 includes a housing, a cylinder 191, an injection unit 192, a hitting unit 193, a driving mechanism 200, and a pressure chamber 195. The cylinder 191, the drive mechanism 200, and the pressure chamber 195 are provided in the housing. The cylinder 191 is made of metal, and the cylinder 191 is fixed to the injection unit 192.

  The striking part 193 has a piston 194 and a driver blade 196. A plurality of protrusions 195A, in the embodiment, eight are provided on the edge 195B of the driver blade 196. The edge 195B is linear and parallel to the axis A4 of the cylinder 191. The protrusion 195A protrudes from the edge 195B in the direction of the straight line E2. The straight line E2 is the width direction of the driver blade 196 and is perpendicular to the axis A4. In a plan view perpendicular to the axis A4, the axis E3 and the axis E4 are arranged at a right angle.

  In the driver blade 196, a protrusion 195D is provided on an edge 195C located opposite to the edge 195B. The protrusion 195D protrudes from the edge 195C in the direction of the straight line E2. Edge 195C is parallel to edge 195B. The direction in which the protrusion 195D protrudes from the edge 195C is opposite to the direction in which the protrusion 195A protrudes from the edge 195B. The arrangement position of the protrusion 195D in the direction of the axis A4 is the same as the arrangement position of the protrusion 195A closest to the tip 195E of the driver blade 196 in the protrusion 195A.

  A seal member 201 and a positioning member 197 are attached to the piston 194. The seal member 201 is a synthetic rubber ring, and the seal member 201 contacts the inner peripheral surface of the cylinder 191 to seal the pressure chamber 195. The pressure chamber 195 is filled with a compressible gas. As the gas, air or an inert gas can be used. The inert gas includes nitrogen gas and noble gas. The positioning member 197 is a synthetic resin ring, and the positioning member 197 contacts the inner peripheral surface of the cylinder 191 to position the piston 194 in the radial direction. The striking portion 193 is movable in the direction of the axis A4 of the cylinder 191.

  The injection part 192 is fixed to the housing, and the injection part 192 includes a cylindrical part 198, a nose part 199 connected to the cylindrical part 198, and a load receiving part 100 connected to the cylindrical part 198. A part of the cylinder 191 is disposed in the cylindrical portion 198, and the cylinder 191 is fixed to the cylindrical portion 198. A bumper 101 is provided between the piston 194 and the load receiving portion 100 in the cylinder 191. The bumper 101 is made of synthetic rubber, and the bumper 101 has a shaft hole 102.

  A guide hole 103 is provided in the load receiving portion 100. The nose portion 199 has a guide plate 104, and an injection path 105 is formed by the guide plate 104. The driver blade 196 is movable in the direction of the axis A4 in the shaft hole 102, the guide hole 103, and the injection path 105. The guide plate 104 has a contact portion 108 protruding in the direction of the straight line E2. The contact portion 108 protrudes from the guide plate 104 toward the injection path 105. In a plan view perpendicular to the axis A4, the injection path 105 is a quadrangle. In plan view perpendicular to the axis A4, the guide plate 104 prevents the driver blade 196 from rotating about the axis A4.

  The drive mechanism 200 includes a pin wheel 106 that rotates counterclockwise by the rotational force of the electric motor, and a plurality of pinion pins 107 provided on the pin wheel 106. A plurality of, for example, eight pinion pins 107 are arranged at intervals in the rotation direction of the pin wheel 106. 18 and 19, the axis E3 that is the rotation center of the pin wheel 106 does not intersect the axis A4. In a plan view parallel to the axis E3, the axis A4 and the axis E3 intersect at a right angle.

  18 and 19 includes the trigger switch, the controller, the rotation restriction mechanism, the battery pack, the phase detection sensor that detects the phase in the rotation direction of the pin wheel 106, and the like. A controller processes the signal of a phase detection sensor, and estimates the position of the hit | damage part 193 in an axis line A4 direction.

  In the driving machine 190 of FIGS. 18 and 19, the pin wheel 106 is stopped when the trigger switch is turned off and the electric motor is stopped. Here, at least one pinion pin 107 is engaged with the protrusion 195A, the striking portion 193 is urged in the first direction D1 by the pressure of the pressure chamber 195, and the striking portion 193 is stopped at the standby position. . When the hitting portion 193 is stopped at the standby position, the contact portion 108 is separated from the driver blade 196.

  When the trigger switch is turned on and the electric motor rotates and the pin wheel 106 rotates counterclockwise, the rotational force of the pin wheel 106 is transmitted to the driver blade 196, and the striking portion 193 moves in the second direction D2, that is, To rise. When the striking part 193 rises, the pressure in the pressure chamber 195 rises. In the process in which the hitting portion 193 moves in the second direction D2, the contact portion 108 contacts the protrusion 195D. As shown in FIG. 19, when the hitting portion 193 reaches the top dead center, all the pinion pins 107 are separated from the projections 195A, and the hitting portion 193 moves in the first direction D1 by the urging force of the pressure chamber 195, that is, descends. To do. For this reason, the contact part 108 leaves | separates from protrusion 195D. Then, the driver blade 196 strikes the stopper, and the stopper is driven into the workpiece. The contact portion 108 and the protrusion 195D are preferably made of a low friction material such as a self-lubricating resin or a tetrafluoroethylene resin. The self-lubricating resin includes polyacetal (Polyoxymethylene: POM) resin and fluororesin. Further, the contact portion 108 and the protrusion 195D may be made of a low friction material. Furthermore, the protrusion 195D may be configured by a roller.

  Further, the piston 194 collides with the bumper 101, and the bumper 101 absorbs a part of the kinetic energy of the hitting portion 193. When the piston 194 collides with the bumper 101, the position of the hitting portion 193 is the bottom dead center. The electric motor is rotating even after the striking portion 193 reaches the bottom dead center. When the at least one pinion pin 107 engages with the protrusion 195A, the hitting portion 193 rises from the bottom dead center. The controller stops the electric motor when the hitting unit 193 reaches the standby position.

  In the driving machine 190 shown in FIGS. 18 and 19, when the hitting unit 193 moves between the top dead center and the bottom dead center, the cylinder 191 positions the hitting unit 193 in the direction of the straight line E2 and the direction of the axis E3. . The guide plate 104 positions the striking portion 193 in the rotational direction about the axis A4.

  When the hitting portion 193 is within a predetermined range including the top dead center in the direction of the axis A4, the contact portion 108 comes into contact with the protrusion 195D. For this reason, it is prevented that the hit | damage part 193 moves to the direction of the straight line E2 in the direction which leaves | separates from the pin wheel 106 with the reaction force of the contact location of the pinion pin 107 and protrusion 195A. That is, the contact part 108 positions the striking part 193 in the straight line E2 direction. Therefore, it is possible to suppress the top dead center of the hitting part 193 from changing in the direction of the axis A4, and it is possible to suppress a change in hitting force applied to the stopper by the hitting part 193. That is, variation in the striking force applied by the striking portion 193 to the stopper can be suppressed, and the driving feeling can be improved.

  Furthermore, if the contact portion 108 is made of a low friction material, the contact resistance when the contact portion 108 is pressed against the protrusion 195D can be reduced. Therefore, when the protrusion 195A is released from the pinion pin 107, the weight 18 can be moved smoothly in the direction of the axis A1.

  The predetermined range of the hitting portion 193 includes the following technical meaning. As shown in FIG. 19, the predetermined range example 1 of the striking portion 193 is a striking portion 193 while the projection 195A located at a location closest to the tip 195E is engaged with the pinion pin 107 among the plurality of projections 195A. This is the movement range. The predetermined range example 2 of the hitting portion 193 is that the load in the direction of the straight line E2 is applied to the hitting portion 193 while the projection 195A located closest to the tip 195E among the plurality of projections 195A is engaged with the pinion pin 107. This is the movement range of the hitting portion 193 in which F5 acts. The load F5 is generated in a direction in which the driver blade 196 is pressed against the contact portion. The load F5 includes a component force.

  Further, when the hitting portion 193 is outside the predetermined range, the contact portion 108 is separated from the protrusion 195D. Therefore, an increase in resistance when the striking portion 193 is moved in the first direction D1 can be suppressed, and a decrease in striking force can be suppressed. Moreover, when moving the hit | damage part 193 in the 2nd direction D2, it can suppress that the load of the electric motor which rotates the pinwheel 106 increases.

  Either the protrusion 195D or the contact portion 108 may be provided. When only the protrusion 195D is provided, the protrusion 195D is brought into contact with the guide plate 104, or a very small gap is provided between the protrusion 195D and the guide plate 104.

  When only the contact portion 108 is provided, the contact portion 108 is brought into contact with the edge 195C, or a very small gap is provided between the contact portion 108 and the edge 195C. In either case, the striking portion 193 is prevented from moving in the direction of the straight line E2 in the direction away from the pin wheel 106 due to the reaction force at the contact point between the pinion pin 107 and the protrusion 195A. Therefore, it is possible to suppress the top dead center of the hitting part 193 from changing in the direction of the axis A4, and it is possible to suppress a change in hitting force applied to the stopper by the hitting part 193.

  For example, JP-A-2006-209941 and JP-A-2006-221610 and JP-A-2006-216610 disclose a driving machine that urges the hitting portion with the pressure of the pressure chamber filled with gas to hit the stopper. Since it is known as described in Japanese Patent Application Publication No. 2017-064864, description of other structures and elements of the driving machine 190 is omitted.

  The meanings of the items described in the present embodiment are as follows. The top dead center of the hitting part 12 is an example of a first position, and the bottom dead center of the hitting part 12 is an example of a second position. The bottom dead center of the weight 18 is an example of a third position, and the top dead center of the weight 18 is an example of a fourth position. The spring 33 and the pressure chamber 195 are an example of a first urging mechanism. The electric motor 14, the first gear 50, the first pulley 71, and the pin wheel 106 are an example of a second urging mechanism. The spring 33 is an example of a third urging mechanism. The movement range of the striking part including the first position is the first predetermined range. The moving range of the weight including the fourth position is the second predetermined range.

  The direction of the axis A1 and the direction of the axis A4 are examples of the moving direction of the hitting portion. The direction of the axis A3, the direction of the axis E1, and the direction of the straight line E2 are examples of directions that intersect the moving direction. The direction of rotation about the axis A1 and the axis A4 is an example of the direction of rotation about the moving direction. The guide bars 32A and 32B and the plunger shaft 29 are examples of a first positioning member. The cylinder 191 and the guide plate 104 are an example of a first positioning member.

  The contact portions 81 and 108 and the roller 90 are an example of a second positioning member. The contact portion 82 and the roller 95 are an example of a third positioning member. The cam rollers 57 and 58 and the pinion pin 107 are an example of a first engagement portion. The cam roller 59 is an example of a second engagement portion.

  The driving machine is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the driving machine. For example, the first urging mechanism or the third urging mechanism can use a synthetic rubber instead of the metal spring. When a spring is used as the first urging mechanism or the third urging mechanism, either a compression spring or a tension spring may be used.

  Furthermore, in the embodiment of FIGS. 1 to 17, it is possible to form an auxiliary pressure chamber between the striking portion and the weight, and to fill the auxiliary pressure chamber with a compressible gas. In this case, the auxiliary pressure chamber also serves as the first urging mechanism and the second urging mechanism. The 2nd positioning member and the 3rd positioning member should just be the structure which can contact and detach | leave from the other member, such as protrusion, a rib, and a pin. Further, the second positioning member and the third positioning member may be either a structure connected to the first positioning member or a structure independent of the first positioning member. The structure in which the second positioning member and the third positioning member are provided independently from the first positioning member includes a structure in which the second positioning member or the third positioning member is provided on the inner surface of the housing.

  The standby position of the hitting unit may be a bottom dead center. Motors that transmit rotational force to the drive mechanism include hydraulic motors, pneumatic motors, and engines in addition to electric motors. The power source that supplies power to the electric motor may be either a DC power source or an AC power source. The mechanism for converting the rotational force of the motor into the moving force of the weight includes a sprocket and a chain in addition to a gear, a pulley, and a belt.

  DESCRIPTION OF SYMBOLS 10,190 ... Driving machine, 11 ... Housing, 12, 193 ... Impacting part, 14 ... Electric motor, 18 ... Weight, 26 ... Stopper, 29 ... Plunger shaft, 32A, 32B ... Guide bar, 33 ... Spring, 50 ... 1st gear, 57, 58, 59 ... Cam roller, 71 ... 1st pulley, 81, 82, 108 ... Contact part, 90, 95 ... Roller, 104 ... Guide plate, 106 ... Pin wheel, 107 ... Pinion pin, 191 ... Cylinder, 192 ... Injection part, 194 ... Piston, 195 ... Pressure chamber, 196 ... Driver blade, A1, A3, A4, E1 ... Axis, D1 ... First direction, D2 ... Second direction, E2 ... Straight line.

Claims (12)

A striking portion that is capable of reciprocating between a first position and a second position, and that strikes a stop when moving in the first direction from the first position toward the second position;
A first urging mechanism for moving the striking portion in the first direction;
A driving machine having
The striking part when the striking part is within a predetermined range including the first position and when the striking part is outside the predetermined range between the first position and the second position. A first positioning member for positioning the striking portion in a direction intersecting the moving direction and a direction rotating around the moving direction;
When the hitting portion is within the predetermined range, the hitting portion is contacted, the hitting portion is positioned in a direction crossing the moving direction, and the hitting portion is outside the predetermined range. A second positioning member away from the portion;
Having a driving machine. A first engaging portion that is engageable and releasable with respect to the striking portion is provided;
When the first engaging portion is engaged with the striking portion, the striking portion is prevented from moving in the first direction by the force of the first biasing mechanism,
2. The driving machine according to claim 1, wherein when the first engagement portion is released from the hitting portion, the hitting portion is moved in the first direction from the first position by the force of the first biasing mechanism. . A second urging mechanism is provided for moving the striking portion in the second direction from the second position toward the first position against the force of the first urging mechanism;
When the first engaging portion is engaged with the striking portion, the striking portion moves in the second direction by the force of the second urging mechanism,
3. The driving machine according to claim 2, wherein when the first engaging portion is released from the hitting portion, the hitting portion moves in the first direction by the force of the first biasing mechanism. The first urging mechanism includes a spring that can expand and contract in the first direction and the second direction,
4. The driving machine according to claim 3, wherein the spring accumulates elastic energy when the striking portion moves in the second direction. The first urging mechanism includes a pressure chamber filled with a compressible gas,
The driving machine according to claim 3 or 4, wherein the pressure in the pressure chamber increases when the striking portion moves in the second direction. A housing that supports the striking portion;
When reciprocating between the third position and the fourth position is supported by the housing so as to be movable in the first direction and the second direction, and the striking portion moves in the first direction. And a weight that moves in the second direction from the fourth position toward the third position;
A third urging mechanism for moving the weight in the second direction;
The driving machine according to claim 3, wherein a driving machine is provided. When the weight is within a second predetermined range including the fourth position, the weight contacts the weight, positions the weight in a direction intersecting the moving direction, and the weight is in the second predetermined range. A third positioning member that is away from the weight when outside,
The driving machine according to claim 6, comprising: A second engagement portion that is engageable and releasable with respect to the weight is provided;
When the second engagement portion is engaged with the weight, the weight is prevented from moving in the second direction by the force of the third urging mechanism,
The driving machine according to claim 6, wherein when the second engagement portion is released from the weight, the weight moves in the second direction by the force of the third urging mechanism.   The driving device according to claim 8, wherein the first biasing mechanism and the third biasing mechanism include a common spring disposed between the hitting portion and the weight.   The driving device according to any one of claims 1 to 9, wherein the second positioning member is connected to the first positioning member.   The driving device according to any one of claims 1 to 10, wherein the second positioning member includes a roller that is rotatable in contact with the hitting portion. The striking part is
A piston receiving the pressure in the pressure chamber;
A driver blade provided on the piston;
Have
The first positioning member is
A cylinder for movably supporting the piston;
An injection unit that movably supports the driver blade and is supplied with the stopper;
Have
The driving machine according to claim 5, wherein the second positioning member is provided in the injection portion.

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