JP2017170530A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving machine that can deal with a situation where a stopper gets clogged in an injection part.SOLUTION: The driving machine comprises: a nose portion 35 to which is supplied a nail 58; a driving tool part 12 that is moved from a top dead point toward a bottom dead point to drive the nail 58; a pressure chamber 13 that applies energizing force to the driving tool part 12; a tooth provided at the driving tool part 12; a pin wheel 49 having a pin; an electric motor 15 that rotates the pin wheel 49; a controller that controls the electric motor 15; and a rotation control mechanism 51 arranged at a power transmission passage between the electric motor 15 and the pin wheel 49. The rotation control mechanism 51 has a function of allowing the pin wheel 49 to rotate in a first rotation direction and in a second rotation direction, and a function of suppressing the pin wheel 49 from rotating in the second rotation direction when rotation force in the second rotation direction is applied to the pin wheel 49 by the energizing force applied from the pressure chamber 13 to the driving tool part 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a driving machine that hits a stopper with an impact tool and drives the stopper into a material to be driven.

  2. Description of the Related Art Conventionally, a driving machine that hits a stopper with a striking tool and drives the stopper onto a material to be driven is known. The driving machine described in Patent Document 1 includes a housing, a plunger provided movably in the housing, a blade as an impact tool provided on the plunger, a spring for pressing the plunger, and a motor provided in the housing. And a drum that is rotated by the rotational force of the motor, and a bumper provided in the housing.

  Moreover, the driving machine described in Patent Document 1 includes a one-way clutch between a motor output shaft and a drum, and a wire wound around the drum. The wire is connected to the plunger. Furthermore, the driving machine described in Patent Document 1 has an injection part provided in the housing, and a magazine provided across the housing and the injection part. The magazine accommodates the nail as a stopper and supplies the nail to the injection portion.

  The driving machine has a handle provided continuously in the housing, and a storage battery removable from the handle. A trigger is provided on the handle, and a control unit is provided in the handle. The driving machine has a trigger switch that detects the operation of the trigger, and a push switch that detects that the injection unit has been pressed against the workpiece. The signal output from the trigger switch and the signal output from the push switch are input to the control unit.

  In the initial state of the driving machine, the plunger is located at the bottom dead center. When the operator presses the injection unit against the workpiece and operates the trigger, electric power is supplied from the storage battery to the motor, and the motor rotates forward. When the rotational force of the motor is transmitted to the drum, the wire is wound around the drum and the plunger is raised. The spring is compressed by raising the plunger. When the plunger reaches the top dead center, the rotational force of the motor is not transmitted to the drum, and the plunger moves toward the bottom dead center by the force of the compressed spring. The nail supplied from the magazine to the injection unit is struck by a blade and driven into a material to be driven. Also, the plunger collides with the bumper, and the bumper absorbs the impact. The one-way clutch prevents the rotational force in the direction opposite to the direction in which the motor is reversely rotated to wind the wire from being applied to the drum.

Japanese Unexamined Patent Publication No. 2015-30052

  However, the driving machine described in Patent Document 1 has been difficult to cope with when the stopper is clogged at the injection portion.

  An object of the present invention is to provide a driving machine that can easily cope with a case where a stopper is clogged at an injection portion.

  The driving machine according to an embodiment is operable between an injection unit to which a stopper is supplied and a top dead center and a bottom dead center, and operates from the top dead center toward the bottom dead center. And a striking tool portion that strikes the stopper, a biasing portion that applies a biasing force to the striking tool portion to move the striking tool portion toward the bottom dead center, and a striking tool portion provided with the striking tool portion. A rotating member having a first engaging portion, a second engaging portion engageable and releasable with respect to the first engaging portion, a motor shaft for rotating the rotating member, and the motor shaft By rotating in the first rotation direction, the motor that operates the impact tool unit from the bottom dead center toward the top dead center, a control unit that controls the motor, the motor shaft, and the rotating member A rotation control mechanism disposed in a power transmission path between the rotation control mechanism and the rotation control mechanism. A function of transmitting to a rotating member to allow the rotating member to rotate in the first rotating direction and to rotate in a second rotating direction opposite to the first rotating direction; A function of suppressing rotation of the rotating member in the second rotating direction when a rotating force in the second rotating direction is applied to the rotating member by an urging force applied to the impact tool unit from ing.

  The driving machine according to an embodiment can easily cope with a case where a stopper is clogged at an injection unit.

It is sectional drawing which looked at the driving machine from the side. It is sectional drawing which looked at the driving machine from the front. It is the expanded sectional view which looked at the driving machine from the side. It is sectional drawing of the rotation control mechanism provided in the driving machine. It is a block diagram which shows the control system of a driving machine. It is a flowchart including the usage example and control example of a driving machine. (A) thru | or (C) is a schematic diagram which shows operation | movement of an impact tool. (A) thru | or (D) is a schematic diagram which shows operation | movement of an impact tool.

  An embodiment of a driving machine will be described with reference to the drawings.

  A driving machine 10 shown in FIGS. 1 and 2 includes a cylindrical housing 11, a striking tool portion 12 arranged from the inside of the housing 11 to the outside, and a striking tool portion 12 having a top dead center and a bottom dead center. A pressure chamber 13 that operates along the first direction B1, a hoisting mechanism 14 that moves the striking tool portion 12 along a second direction B2 opposite to the first direction, and a rotational force applied to the hoisting mechanism 14 And an electric motor 15 for transmitting.

  The housing 11 includes a main body 16, a cover 17 in which the opening of the main body 16 is closed, a handle 18 and a motor housing portion 19 that are continuous with the main body 16, and a connection portion 20 that connects the handle 18 and the motor housing portion 19. Have 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 chamber 13 is formed in the pressure accumulation container 21. The striking tool unit 12 includes a piston 24 that is movably disposed in the cylinder 22, and a driver blade 25 that is fixed to the piston 24.

  The piston 24 is movable in the axis A1 direction within the cylinder 22. The direction of the axis A1 is parallel to the first direction B1 and the second direction B2. A seal member 79 is attached to the outer periphery of the piston 24, and the seal member 79 contacts the inner surface of the cylinder 22 to form a seal surface. The seal member 79 hermetically seals the pressure chamber 13. Compressed air is enclosed in the pressure chamber 13.

  The driver blade 25 may be made of metal or resin. As shown in FIG. 2, the driver blade 25 has a narrow plate-shaped portion, and a rack 26 is provided along the longitudinal direction at the edge of the plate-shaped portion. Yes. The rack 26 has a plurality of teeth, specifically eight teeth 27a to 27h. The eight teeth 27a to 27h are arranged at a constant interval in the direction of the axis A1. Of the driver blade 25, the teeth 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h are arranged in this order from the position close to the piston 24 in the direction of the axis A1 toward the tip 25a that is away from the piston 24. Is arranged. The amounts of the eight teeth 27a to 27h protruding from the edge of the driver blade 25 are all the same.

  The holder 28 is disposed from the inside of the main body 16 to the outside. The holder 28 may be made of aluminum alloy or synthetic resin. The holder 28 includes a cylindrical load receiving portion 29, an arc-shaped cover 30 that is continuous with the load receiving portion 29, and a tail portion 31 that is continuous with the load receiving portion 29. As shown in FIG. 3, the tail portion 31 is continuous with the motor housing portion 19.

  As shown in FIG. 2, the load receiving portion 29 is disposed in the main body 16, and the load receiving portion 29 has a shaft hole 32. A bumper 33 is provided in the load receiving portion 29. The bumper 33 is integrally formed of a rubber-like elastic member. The bumper 33 has a shaft hole 34. The shaft holes 32 and 34 are both arranged with the axis A1 as the center, and the driver blade 25 is movable in the direction of the axis A1 within the shaft holes 32 and 34. The cover 30 is disposed in the tail portion 31. A nose portion 35 is fixed to the tail portion 31 using a screw member 78, and the nose portion 35 has an injection path 36. The nose part 35 is assembled by fixing a plurality of elements to each other. The injection path 36 is a space or a passage, and the driver blade 25 can move in the direction of the axis A1 in the injection path 36.

  The electric motor 15 is provided in the motor housing portion 19. The electric motor 15 has a motor shaft 37, and the motor shaft 37 is rotatably supported by bearings 38 and 39. The motor shaft 37 is rotatable about the axis A2. In a side view of the driving machine 10 shown in FIG. 3, the axis A1 and the axis A2 intersect at a right angle. As shown in FIG. 1, a detachable storage battery 40 is provided for the connection unit 20, and the storage battery 40 supplies power to the electric motor 15.

  The storage battery 40 includes a storage case 41 and battery cells stored in the storage case 41. 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 40 is a direct current power source. A first terminal is provided in the housing case 41, 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 40 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. 3, the gear case 42 is provided in the tail portion 31, and the reduction gear 43 is provided in the gear case 42. The reduction gear 43 includes an input member 44, an output member 45, and three sets of planetary gear mechanisms. The input member 44 is fixed to the motor shaft 37. The input member 44 and the output member 45 are rotatable about the axis A2. The rotational force of the motor shaft 37 is transmitted to the output member 45 via the input member 44. The reduction gear 43 reduces the rotation speed of the output member 45 relative to the input member 44.

  The winding mechanism 14 is disposed in the cover 30. The winding mechanism 14 includes a pin wheel shaft 48 rotatably supported by bearings 46 and 47, a pin wheel 49 fixed to the pin wheel shaft 48, and a pinion mechanism 77 provided on the pin wheel 49. The pinion mechanism 77 includes eight pins 50 a to 50 h arranged at intervals in the circumferential direction of the pin wheel 49. The number of teeth 27a to 27h and the number of pins 50a to 50h are the same. The bearing 46 and the bearing 47 are arranged at different positions in the direction of the axis A2, and the bearing 46 is arranged between the speed reducer 43 and the bearing 47. The winding mechanism 14 is disposed between the bearing 46 and the bearing 47 in the direction of the axis A1.

  As shown in FIG. 2, when the driving machine 10 is viewed from the front, the axis A1 and the axis A2 do not intersect. Further, a clearance in the rotational direction of the pin wheel 49 is formed between the pins. In the rotational direction of the pin wheel 49, the gap amount between the pins 50a and 50b, the gap amount between the pins 50b and 50c, the gap amount between the pins 50c and 50d, the gap amount between the pins 50d and 50e, and the pin 50e The gap amount between the pin 50f, the gap amount between the pin 50f and the pin 50g, and the gap amount between the pin 50g and the pin 50h are all the same. The gap amount between the pin 50h and the pin 50a is wider than the gap amount between other pins.

  A rotation control mechanism 51 is provided in the gear case 42. The rotation control mechanism 51 is disposed in a power transmission path between the motor shaft 37 and the pin wheel 49. The rotation control mechanism 51 is disposed between the bearing 46 and the output member 45 in the direction of the axis A2. The rotation control mechanism 51 is a mechanism that transmits the rotational force of the output member 45 to the pinwheel shaft 48. The rotation control mechanism 51 has a function of allowing the rotational force of the output member 45 to be transmitted to the pinwheel shaft 48 regardless of the rotation direction of the output member 45. The rotation control mechanism 51 has a function of preventing the rotation of the pinwheel shaft 48 regardless of the rotation direction of the pinwheel shaft 48. That is, the rotational force of the pin wheel shaft 48 is not transmitted to the output member 45.

  As shown in FIG. 4, the rotation control mechanism 51 includes an annular member 52 fixed to the gear case 42, a lock cam 53 fixed to the pin wheel shaft 48, a protrusion 54 provided on the output member 45, and a plurality of rolling elements. 55b. The annular member 52, the lock cam 53, the output member 45, and the rolling element 55b are all made of metal. A plurality of concave portions 56 are provided on the inner peripheral surface of the gear case 42 at intervals in the circumferential direction, and a plurality of convex portions 57 are provided on the outer peripheral surface of the annular member 52 at intervals. The convex portion 57 is disposed in the concave portion 56, and the annular member 52 does not rotate with respect to the gear case 42. The inner peripheral surface of the annular member 52 is circular with the axis A2 as the center.

  The lock cam 53 is disposed inside the annular member 52, and a protrusion 53 a is provided on the outer peripheral surface of the lock cam 53. The protrusions 53a are provided at a plurality of positions, for example, at three positions at regular intervals in the rotation direction of the lock cam 53. On the outer peripheral surface of the lock cam 53 located between the protrusions 53a, a raised portion 53b is provided at the center in the rotational direction, and a recess 53c is formed on both sides of the raised portion 53b in the rotational direction via slope portions 53e. . The recesses 53c are provided at a plurality of locations, for example, 6 locations in the rotation direction of the lock cam 53.

  The rolling element 55 b is a cylinder or a sphere, and the outer diameter of the rolling element 55 b is larger than the gap amount between the raised portion 53 b and the annular member 52. The gap amount between the raised portion 53 b and the annular member 52 is a value in the radial direction of the annular member 52. The rolling elements 55 b are arranged between the three recesses 53 c and the inner peripheral surface of the annular member 52 in the radial direction of the annular member 52.

  The protrusion 54 protrudes from the end face of the output member 45 toward the bearing 46 in the direction of the axis A2. The protrusions 54 are arranged at a plurality of places, for example, three places at regular intervals in the rotation direction of the output member 45. The protrusion 54 is disposed between the rolling element 55 b and the protrusion 53 a in the rotation direction of the output member 45. The protrusion 54 is disposed between the annular member 52 and the raised portion 53 b in the radial direction of the annular member 52. The protrusion 54 is movable between the rolling element 55 b and the protrusion 53 a in the rotation direction of the output member 45.

  Further, a magazine 59 for accommodating the nail 58 is provided, and the magazine 59 is supported by the nose portion 35 and the connection portion 20. The magazine 59 has a feed mechanism that supplies the nail 58 to the injection path 36.

  A motor board 60 is provided in the motor housing 19, and an inverter circuit 61 is provided on the motor board 60. The inverter circuit 61 has a plurality of switching elements, and all of the plurality of switching elements can be turned on and off.

  A control board 62 is provided in the connection unit 20, and a controller 63 shown in FIG. 5 is provided on the control board 62. The controller 63 is a microcomputer having an input port, an output port, a central processing unit, and a storage device. The controller 63 is connected to the second terminal via the lead wire 64 and is connected to the inverter circuit 61 via the lead wire 65.

  A trigger 66 is provided on the handle 18. The trigger 66 can reciprocate linearly with respect to the handle 18. A trigger switch 67 is provided in the handle 18, and the trigger switch 67 is turned on when an operating force is applied to the trigger 66 and turned off when the operating force of the trigger 66 is released.

  A push lever 68 is attached to the nose portion 35. The push lever 68 is movable with respect to the nose portion 35 in the direction of the axis A1. A push switch 69 is provided, and the push switch 69 is turned on when the push lever 68 is pressed against the driven material 70 and turned off when the push lever 68 is separated from the driven material 70. A position detection sensor 71 for detecting the position of the driver blade 25 in the direction of the axis A1 is provided. The position detection sensor 71 is provided in the nose part 35 or the tail part 31, for example.

  A phase detection sensor 72 that detects the phase in the rotational direction of the pin wheel 49 is provided. The phase detection sensor 72 is provided in the tail part 31, for example. A disengagement switch 73 is provided on the handle 18 or the connecting portion 20. The disengagement switch 73 is operated when an operator releases the engagement between the pinion mechanism 77 and the rack 26 by switching the rotation direction of the motor shaft 37 of the electric motor 15. Further, the disengagement switch 73 may be a reset switch, and the controller 63 stores the previous rotation direction of the motor shaft 37. When the reset switch is operated, the controller 63 rotates the motor shaft 37 in the direction opposite to the previous rotation direction. It should be noted that the switching of the motor shaft 37 of the electric motor 15 can be automatically performed by the controller 63.

  Further, an off switch 74 is provided. The off switch 74 causes the operator to stop the controller 63 by operating the off switch 74 after the work is completed. The stop of the controller 63 includes that the controller 63 enters a sleep state and that power supply to the controller 63 is stopped.

  The current value detection sensor 75 detects the current value of the electric circuit that connects the storage battery 40 and the electric motor 15. The trigger switch 67 signal, push switch 69 signal, position detection sensor 71 signal, phase detection sensor 72 signal, disengagement switch 73 signal, off switch 74 signal, and current value detection sensor 75 signal 63.

  Next, an operation of driving the nail 58 into the driven material 70 with the driving machine 10 will be described. The operator operates the disengagement switch 73 in advance to set the rotation direction of the motor shaft 37 of the electric motor 15 to normal rotation. The controller 63 turns off all the switching elements of the inverter circuit 61 when the trigger switch 67 is turned off and the push switch 69 is turned off. For this reason, the electric power of the storage battery 40 is not supplied to the electric motor 15, and the electric motor 15 is stopped.

  When the electric motor 15 is stopped, the piston 24 is separated from the bumper 33 and stopped. That is, the piston 24 is stopped between the bottom dead center and the top dead center, and the driver blade 25 is stopped at the standby position. The bottom dead center of the piston 24 is a state where the piston 24 is pressed against the bumper 33. The top dead center of the piston 24 is a position where the piston 24 is closest to the pressure chamber 13.

  When the controller 63 detects that the trigger switch 67 is turned on and the push switch 69 is turned on, the controller 63 repeats control to turn on and off the switching element of the inverter circuit 61, and the electric power of the storage battery 40 is supplied to the electric motor 15. Supply. Then, the electric motor 15 stops after the motor shaft 37 rotates in the positive direction. The rotational force of the motor shaft 37 is transmitted to the pin wheel shaft 48 via the speed reducer 43.

  The forward rotation of the motor shaft 37 is assumed to be counterclockwise in FIG. The rotation directions of the motor shaft 37 and the output member 45 are the same. When the output member 45 rotates counterclockwise in FIG. 4, the protrusion 54 is pressed against the protrusion 53a. For this reason, the rotational force of the output member 45 is transmitted to the pin wheel 49 via the protrusion 53a, and the pin wheel 49 rotates counterclockwise in FIG. The rotation direction of the pin wheel shaft 48 is the same as the rotation direction of the pin wheel 49. That is, when the motor shaft 37 rotates forward, the pin wheel shaft 48 and the pin wheel 49 rotate counterclockwise in FIG.

  When the pin wheel 49 rotates counterclockwise in FIG. 2, the pins 50a to 50h and the rack 26 are engaged. Specifically, as the pin wheel 49 rotates, the pin 50a and the tooth 27a, the pin 50b and the tooth 27b, the pin 50c and the tooth 27c, the pin 50d and the tooth 27d, the pin 50e and the tooth 27e, the pin 50f and the tooth 27f, The pin 50g and the tooth 27g, and the pin 50h and the tooth 27h are sequentially engaged and released. The pin 50 a is a first pin located at the head in the rotation direction of the pin wheel 49. The pin 50 h is a final pin located at the rear end in the rotation direction of the pin wheel 49. One pin and one tooth are set as one set, and one set of pins and teeth, or two sets of pins and teeth are engaged at the same time, so that the rotational force of the pin wheel 49 is changed to the axis A1 of the driver blade 25. It is converted into an operating force in the parallel second direction B2.

  In this way, the driver blade 25 operates in a direction approaching the pressure chamber 13 in the direction of the axis A1. That is, the piston 24 moves from the bottom dead center shown in FIG. 2 toward the top dead center, and the air pressure in the pressure chamber 13 increases.

  The piston 24 reaches the top dead center by the engagement force between the pin 50h and the tooth 27f. When the pin 50h is released from the tooth 27h, that is, when all the pins and protrusions are released, the force that moves the piston 24 toward the top dead center is released. For this reason, the piston 24 moves toward the bottom dead center by the air pressure of the pressure chamber 13. Then, the driver blade 25 strikes a nail 58 in the injection path 36, and the nail 58 is driven into the driven material 70.

  Further, in the rotational direction of the pin wheel 49, the gap amount between the pin 50h and the pin 50a is wider than the gap amount between other pins. For this reason, the pin wheel 49 rotates normally while the driver blade 25 moves from the top dead center to the bottom dead center, but the teeth 27a to 27h do not contact any of the pins 50a and 50h.

  The piston 24 collides with the bumper 33 after the nail 58 is driven into the driven material 70. The bumper 33 is elastically deformed to absorb the kinetic energy of the piston 24 and the driver blade 25. Further, the motor shaft 37 of the electric motor 15 rotates forward even after the driver blade 25 hits the nail 58. Then, the pin 50a is engaged with the tooth 27a, the pin 50b is engaged with the tooth 27b, and the driver blade 25 is raised again by the rotational force of the pin wheel 49. When the driver blade 25 reaches the standby position, the controller 63 stops the electric motor 15.

  When the electric motor 15 stops, the rotation control mechanism 51 holds the driver blade 25 at the standby position. The driver blade 25 receives the urging force of the pressure chamber 13, and the urging force received by the driver blade 25 is transmitted to the pin wheel shaft 48 via the pin wheel 49. That is, the pin wheel shaft 48 and the lock cam 53 receive the clockwise rotational force in FIG.

  When the lock cam 53 receives the clockwise rotational force in FIG. 4, the rolling element 55 b rolls between the lock cam 53, the outer peripheral surface and the inner peripheral surface of the annular member 52, and the rolling element 55 b The inclined portion 53e provided between the hollow portion 53c and the inner peripheral surface of the annular member 52 is bitten by the inclined portion 53e. That is, the rotational force received by the lock cam 53 in FIG. 4 is received by the gear case 42 via the annular member 52. Therefore, rotation of the pin wheel shaft 48 is prevented, and the driver blade 25 stops at the standby position. Thus, when the driver blade 25 is held at the standby position, the rotational force of the pin wheel 49 corresponding to the pressure in the pressure chamber 13 is handled by the gear case 42 via the rotation control mechanism 51. No load.

  The operator drives the nail 58 into the workpiece 70 and then moves the push lever 68 away from the workpiece 70 with the trigger switch 67 turned on. When the operator presses the push lever 68 against the workpiece 70 again, the trigger switch 67 is turned on, the push switch 69 is turned on, and the controller 63 performs the same control as described above. Thereafter, when the operator repeats the above operation, the nail 58 can be sequentially driven into the driven material 70.

  An example of use and control of the driving machine 10 will be described with reference to the flowchart of FIG. When the storage battery 40 is attached to the connection unit 20, the flowchart of FIG. 6 is started. When the controller 63 detects that the trigger switch 67 is on and the push switch 69 is on in step S1, the controller 63 performs control to drive the nail 58 with the driver blade 25 in step S2.

  In step S3, the controller 63 determines whether or not the driver blade 25 has reached bottom dead center. The purpose of step S3 is to determine whether or not the nail 58 is clogged in the ejection path 36 from the position of the driver blade 25 in the direction of the axis A1. When the controller 63 makes a positive determination in step S3, that is, when the nail 58 is not clogged, the controller 63 normally rotates the electric motor 15 to rotate the pin wheel 49 and raise the driver blade 25.

  Further, the controller 63 detects the actual current value supplied to the electric motor 15 in step S4 when the pin wheel 49 is rotating forward, and whether or not the actual current value i is less than the threshold value i0. Judging. The threshold value i0 is a value for determining whether or not the driver blade 25 can be raised normally.

  If the actual current value i is less than the threshold value i0, it means that the driver blade 25 can be raised normally. If the actual current value i is greater than or equal to the threshold value i0, it means that there is a factor that hinders the rise of the driver blade 25. The threshold value I0 is a value obtained by experiment or simulation, and the threshold value i0 is stored in advance in the storage device.

  If the controller 63 makes a positive determination in step S4, it stops the electric motor 15 when the driver blade 25 reaches the standby position in step S5, and returns to step S1.

  If the nail 58 is not clogged in the injection path 36, when the pin wheel 49 rotates forward and moves the driver blade 25 toward the top dead center, the pin 50a engages the tooth 27a and the pin 50b engages the tooth 27b. Engaged, pin 50c is engaged with tooth 27c, pin 50d is engaged with tooth 27d, pin 50e is engaged with tooth 27e, pin 50f is engaged with tooth 27f, pin 50g is with tooth 27g The pin 50h engages with the tooth 27h.

  In addition, each of the pins 50a to 50h can be separately engaged and released with respect to each of the teeth 27a to 27h. Each of the pins 50a to 50h and each of the teeth 27a to 27h are not engaged at the same time, and one set of one pin and one projection is used as one set, and one set or two sets are related to each other. Combined.

  If the controller 63 makes a negative determination in step S3, that is, if the nail 58 is clogged with the injection path 36, or if a negative determination is made in step S4, the controller 63 detects the rotational direction phase of the pin wheel 49 in step S6. In addition, the position of the driver blade 25 in the direction of the axis A1 is detected. The controller 63 detects only the pins 50a and 50h by detecting the phase of the pin wheel 49, and detects whether or not the driver blade 25 is located at the bottom dead center by detecting the position of the driver blade 25. 50h is engaged with one of the teeth 27a to 27h of the driver blade 25.

  First, in step S7, the controller 63 rotates the motor in the forward direction, and determines whether or not the pin 50a and any of the teeth 27a to 27h are engaged. For example, as shown in FIG. 7A, when the pin 50a and the tooth 27d are engaged, the controller 63 makes a positive determination in step S7, proceeds to step S8, and stops the electric motor 15. And the pinwheel 49 is stopped. The operator removes the nail 58 from the injection path 36 in step S9. For example, the elements of the nose portion 35 are disassembled, and the nail 58 is removed from the injection path 36. While the operator removes the nail 58 from the injection path 36, the pin 50a and the tooth 27d are engaged.

  That is, the urging force received from the pressure chamber 13 received by the driver blade 25 is transmitted to the pin wheel shaft 48 via the pin wheel 49, and the pin wheel shaft 48 and the lock cam 53 receive the clockwise rotational force in FIG. . The clockwise rotational force received by the lock cam 53 in FIG. 4 is received by the gear case 42 via the annular member 52 as described above. For this reason, rotation of the pin wheel 49 and the pin wheel shaft 48 is prevented, and the driver blade 25 can be prevented from operating by the urging force of the pressure chamber 13. Therefore, the operator can easily remove the nail 58 from the injection path 36.

  After the operator removes the nail 58 from the injection path 36, the elements of the nose portion 35 are assembled. Thereafter, the operator operates the disengagement switch 73 to rotate the electric motor 15 in the direction opposite to the previous rotation direction. Then, the controller 63 reversely rotates the electric motor 15 in step S10, and reversely rotates the pin wheel 49 as shown in FIG. 7B. With the reverse rotation of the pin wheel 49, the pin 50a and the tooth 27d are released, and the driver blade 25 is lowered as shown in FIG. While the driver blade 25 is lowered by the urging force of the pressure chamber 13, any of the pins 50a to 50h and any of the teeth 27a to 27h are not engaged.

  In step S11, the controller 63 stops the electric motor 15 to stop the pin wheel 49, and detects the actual current value i. If the actual current value i is less than the threshold value i2, it means that the pins and teeth are all released. The threshold value i2 is larger than the threshold value i0. The controller 63 proceeds to step S3 after performing the control in step S11.

  At the time of determination in step S7, as shown in FIG. 8A, when the pin 50a and the teeth 27a to 27h are in the disengaged positions, the controller 63 makes a negative determination in step S7, In step S12, the motor shaft 37 of the electric motor 15 is reversely rotated, and the pin wheel 49 is reversely rotated. The controller 63 makes a negative determination in step S7 when the detected value of the current of the electric motor 7 becomes equal to or greater than a certain value. If an angle detection sensor for detecting the rotation angle of the motor shaft 37 is provided, the controller 63 may process the signal output from the angle detection sensor and perform the determination in step S7. The controller 63 may make the determination in step S7 by combining the position of the pin 50a, the detected current value of the electric motor 7, and the signal of the angle detection sensor.

  Note that “the pin 50a is difficult to engage with any of the teeth 27a to 27h” means that the movement of the driver blade 25 is restricted by the pin 50a and the teeth 27a to 27h of the rack 26 of the driver blade 25. Is difficult.

  The principle of reverse rotation of the pin wheel 49 will be described. The reverse rotation of the motor shaft 37 means that the motor shaft 37 rotates clockwise in FIG. When the motor shaft 37 rotates clockwise in FIG. 4, the output member 45 also rotates clockwise in FIG. When the output member 45 rotates clockwise in FIG. 4, the protrusion 54 is pressed against the rolling element 55b, and the rolling element 55b is pressed against the protrusion 53a. Therefore, the lock cam 53 can be rotated in the clockwise direction by moving the rolling element 55b, which has been pressed against the inner peripheral surface of the annular member 52 by the inclined surface portion 53e, to the recess portion 53c. Rotate. The rotation direction of the pin wheel shaft 48 is the same as the rotation direction of the lock cam 53. That is, when the motor shaft 37 rotates in the reverse direction, the pin wheel shaft 48 and the pin wheel 49 rotate in the clockwise direction in FIG.

  Further, the controller 63 detects the actual current value i in step S12. When the actual current value i becomes equal to or greater than the threshold value i1, the controller 63 determines that the pin 50h is pressed against any one of the teeth 27a to 27h as shown in FIG. 8B. The threshold value i1 is larger than the threshold value i0. FIG. 8B illustrates a state where the pin 50h is positioned between the teeth 27b and the teeth 27c, and the pin 50h is pressed against the teeth 27c. When the pin 50h is pressed against the teeth 27c, the position in the rotational direction of the pin wheel 49 is referred to as a support position. When the pin 50h is positioned between the teeth 27b and the teeth 27c, the position in the rotational direction of the pin wheel 49 is referred to as a support position.

  Then, the controller 63 stops the electric motor 15 and stops the pin wheel 49 in step S13. The controller 63 may stop the pin wheel 49 when the pin 50h and the tooth 27c contact each other. Note that “the pin 50h and the tooth 27c abut” is a state where the pin 50h and the tooth 27c are in contact with each other and the movement of the impact tool portion 12 is not suppressed.

  The operator removes the nail 58 from the injection path 36 in step S14 while the pin wheel 49 is stopped. The work in step S14 is the same as the work in step S9. When the operator removes the nail 58 from the injection path 36, the driver blade 25 is lowered by the urging force of the pressure chamber 13. Then, in the driver blade 25, as shown in FIG. 8C, the teeth 27b come into contact with the pins 50h. When the teeth 27b come into contact with the pin 50h, the urging force received by the driver blade 25 is transmitted to the pin wheel shaft 48 via the pin wheel 49.

  4 is transmitted to the lock cam 53 via the rotation control mechanism 51 to rotate the lock cam 53, and the rolling element 55b and the annular member 52 cause the pin wheel 49 to rotate. Be blocked. For this reason, the driver blade 25 stops when the tooth 27b contacts the pin 50h. That is, the amount L1 by which the driver blade 25 is lowered is a value corresponding to the amount of the gap formed between the pin 50h and the teeth 27b located above the pin 50h.

  For this reason, when the operator removes the nail 58 from the injection path 36, the driver blade 25 can be prevented from descending beyond the amount L1. Therefore, the operator can easily remove the nail 58 from the injection path 36.

  After the operator removes the nail 58 from the injection path 36, the nose portion 35 is assembled. Then, the operator operates the disengagement switch 73 to select the normal rotation of the electric motor 15. Then, the controller 63 rotates the electric motor 15 forward in step S15, and the pinwheel 49 rotates forward, that is, counterclockwise in FIG. 8C.

  When the pin wheel 49 rotates counterclockwise in FIG. 8C, the driver blade 25 is lifted by a small amount, and then the pin 50h and the teeth 27b are released. The driver blade 25 is driven by the urging force of the pressure chamber 13. It descends like 8 (D). While the driver blade 25 is lowered by the urging force of the pressure chamber 13, any of the pins 50a to 50h and any of the teeth 27a to 27h are not engaged. The controller 63 proceeds to step S3 after performing the control in step S15.

  As described above, when the pin wheel 49 is stopped and the nail 58 is removed from the injection path 36 and then the pin wheel 49 is rotated forward or backward and the driver blade 25 descends, any of the teeth 27a to 27h is detected. It is possible to avoid a collision between the pin 50a and any of the pins 50a to 50h. Therefore, deformation or breakage of the teeth 27a to 27h and the pins 50a to 50h can be prevented. Further, there is no need to increase the rigidity of the teeth 27a to 27h and the pins 50a to 50h, and the teeth 27a to 27h and the pins 50a to 50h can be reduced in size or weight.

  When the nail 58 is clogged with the injection path 36, the driving machine 10 removes the nail 58 depending on whether either the pin 50a or the pin 50h and any of the teeth 27a to 27h are engaged. By rotating the electric motor 15 forward or backward, it is possible to avoid any of the pins 50a to 50h colliding with any of the teeth 27a to 27h when the driver blade 25 is lowered. Therefore, it is easy to cope with the case where the nail 58 is clogged in the injection path 36.

  Furthermore, when removing the nail 58 from the injection path 36, if a force is applied to move the driver blade 25 toward the top dead center, the pin wheel shaft 48 receives a counterclockwise rotational force in FIG. . However, when the lock cam 53 receives the counterclockwise rotational force in FIG. 4, the rolling element 55 a rolls between the lock cam 53, the outer peripheral surface and the inner peripheral surface of the annular member 52, and the rolling element 55 a is raised. It bites between the portion 53b and the inner peripheral surface of the annular member 52. That is, the rotational force received by the lock cam 53 in FIG. 4 is received by the gear case 42 via the annular member 52. For this reason, the rotational force of the pin wheel shaft 48 is not transmitted to the output member 45. Therefore, the electric motor 15 is not loaded even if a force is applied to move the driver blade 25 toward the top dead center during the removal of the nail 58.

  The meaning of the matters described in the embodiment will be described. The nail 58 corresponds to a stopper, the pressure chamber 13 corresponds to an urging portion, the pin wheel 49 corresponds to a rotating member, and the teeth 27a to 27h are the first. Corresponding to the engaging part, the pins 50a to 50h correspond to the second engaging part, the electric motor 15 corresponds to the motor, and the nose part 35 corresponds to the injection part. The inverter circuit 61 and the controller 63 correspond to a control unit, the controller 63, the position detection sensor 71 and the phase detection sensor 72 correspond to a state determination unit, the lock cam 53 corresponds to an intermediate member, and the projection 54 8 corresponds to one protrusion, the protrusion 53a corresponds to the second protrusion, the tooth 27c shown in FIG. 8 corresponds to the expected engaging portion, and the tooth 27b corresponds to the upper engaging portion. The counterclockwise direction described in FIGS. 2, 4, 7, and 8 is the first rotation direction, and the clockwise direction is the second rotation direction. The teeth 27b shown in FIG. 8B are planned engagement portions, and the teeth 27 are lower engagement portions.

  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, it is possible to connect a bellows and a piston to form a pressure chamber in the bellows. Further, the striking force applying mechanism that applies a biasing force to the striking tool may be either a structure that operates the striking tool with air pressure or a structure that operates the striking tool with the force of an elastic member. The elastic member may be either a synthetic rubber or a metal compression spring. That is, the structure includes a structure in which the elastic force of the metal spring is applied to the striking tool to strike the stopper. When using a bellows or using a metal spring, the guide member for guiding the operation of the impact tool may be a rail instead of a cylinder.

  Further, the impact tool may be any of a narrow plate shape, a rod shape, and an axial shape. Further, a plurality of pins in which a plurality of first engagement elements are arranged at intervals in the longitudinal direction of the impact tool may be used. In this case, the plurality of second engagement elements are a plurality of teeth provided on the outer peripheral surface of the rotating member and arranged at intervals in the rotation direction.

  The control unit, the motor control unit, the stopper detection unit, and the state determination unit are configured by a single electronic component or a plurality of electronic components. The control unit, the motor control unit, the stop detection unit, and the state determination unit include a processor, a control circuit, a storage device, a module, and a unit.

  Motors that move the striking mechanism away from the bumper include an electric motor, a hydraulic motor, and a pneumatic 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.

  When an AC power source is used as a power source, the driving machine and an AC power source outlet are connected by a power cable. The stopper driven into the workpiece by the driving machine includes a U-shaped stopper in addition to the shaft-shaped nail. The nail includes a nail having a head and a nail having no head. The injection part to which the stopper is supplied has an injection path through which the stopper and the impact tool move. The injection path includes a space, a hole, a groove, and a recess.

  In the description referring to FIG. 2, FIG. 4, FIG. 7 and FIG. 8, the counterclockwise rotation is the forward rotation and the clockwise rotation is the reverse rotation. This is a definition made for the sake of convenience in order to explain the rotation direction of the motor shaft 37 and the pin wheel 49 in a state in which the driving machine 10 is viewed from the front in FIG. Therefore, when the driving machine is viewed from the back, it is possible to define that the clockwise rotation is the reverse rotation and the counterclockwise rotation is the positive rotation.

  Further, in order to explain the positions of the driver blade 25 and the piston 24, definitions of top dead center and bottom dead center are made. This is a definition made for convenience in order to explain the case where the driving machine 10 is used with the axis A1 parallel to the vertical line as shown in FIG.

  If the workpiece 70 is a wall, the driving machine 10 can be used in a state where the axis A1 is perpendicular to the vertical line or in a state where the axis A1 intersects the vertical line. . In this case, it is possible to define the top dead center as the first position and the bottom dead center as the second position.

  The workpiece 70 includes a floor, a wall, a ceiling, a pillar, and a roof. The material of the workpiece 70 includes wood, concrete, and plaster.

DESCRIPTION OF SYMBOLS 10 Driving machine 12 Impact tool part 13 Pressure chamber 15 Electric motor 24 Piston 25 Driver blade 25a Tip 26 Rack 27a-27h Tooth 49 Pin wheel 50a-50h Pin 51 Rotation control mechanism 58 Nail 61 Inverter circuit 63 Controller 71 Position detection sensor 72 Phase detection sensor 73 Disengagement switch 77 Pinion mechanism

Claims (7)

An injection part to which a stopper is supplied;
An impact tool part operable between a top dead center and a bottom dead center and operating from the top dead center toward the bottom dead center to strike the stopper;
An urging portion that applies an urging force to the striking tool portion to operate the striking tool portion toward the bottom dead center;
A first engagement portion provided in the impact tool portion;
A rotating member having a second engaging portion engageable and releasable with respect to the first engaging portion;
A motor having a motor shaft for rotating the rotating member, and the motor shaft rotating in the first rotation direction to operate the impact tool unit from the bottom dead center toward the top dead center;
A control unit for controlling the motor;
A rotation control mechanism disposed in a power transmission path between the motor shaft and the rotating member;
Have
The rotation control mechanism is
Allowing the rotational force of the motor shaft to be transmitted to the rotating member to allow the rotating member to rotate in the first rotational direction and to rotate in a second rotational direction opposite to the first rotational direction. Function to
A function of suppressing rotation of the rotating member in the second rotational direction when a rotational force in the second rotational direction is applied to the rotating member by an urging force applied from the urging unit to the impact tool unit. When,
Equipped with a driving machine. The rotation control mechanism is
An output member connected to the motor shaft so as to be capable of transmitting power and having a first protrusion;
An intermediate member connected to the rotating member so as to be capable of transmitting power and having a second protrusion;
A rolling element disposed between the first protrusion and the second protrusion and movable in the rotation direction of the output member;
Have
2. The striking device according to claim 1, wherein when the motor shaft rotates in the second rotation direction, the first protrusion causes the rolling element to abut against the second protrusion, and the rotating member rotates in the second rotation direction. Embedded machine. An engagement release switch that controls the rotation of the motor shaft by being operated by an operator to release the engagement between the first engagement portion and the second engagement portion is provided,
The controller is
When the striking tool portion stops on the way from the top dead center to the bottom dead center, the rotating member is rotated in the first rotation direction by the rotational force of the motor, and the first engaging portion and the first Control for engaging the two engaging portions;
A control for rotating the motor shaft in the second rotation direction so as to release the first engagement portion and the second engagement portion when the engagement release switch is operated;
The driving machine according to claim 1 or 2, wherein:   4. The driving device according to claim 1, further comprising a state determination unit that determines whether the first engagement unit and the second engagement unit are engaged or released. Machine. An engagement release switch that switches the rotation direction of the motor shaft between the first rotation direction and the second rotation direction by being operated by an operator is provided,
The controller is
When the striking tool portion stops midway from the top dead center to the bottom dead center, the rotational direction position of the rotating member may cause the second engaging portion to engage the first engaging portion. Control for rotating the motor shaft in the second rotational direction so as to be in a support position that is possible;
When the disengagement switch is operated and the rotation direction of the motor shaft is switched to the first rotation direction, the motor shaft is moved until the first engagement portion and the second engagement portion are released. Control to rotate in the first rotation direction;
The driving machine according to claim 1 or 2, wherein:   When the control unit determines that the first engagement portion and the second engagement portion are in a disengaged position when the rotation member is rotated in the first rotation direction, the motor 6. The driving machine according to claim 5, wherein the shaft is rotated in the second rotation direction. The impact tool portion is
A piston that receives the biasing force of the biasing portion;
A driver blade connected to the piston;
Have
A plurality of the first engaging portions are arranged along the operation direction of the impact tool portion,
The support position of the rotating member is
The second engagement portion is a planned engagement portion with which the second engagement portion is engaged among the plurality of first engagement portions, and the movement direction of the impact tool portion is more than the planned engagement portion. Located between the lower engagement part located near the tip of the driver blade,
Or
The second engagement portion is in a position in contact with the lower engagement portion;
The driving machine according to claim 5, comprising:

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