JP6753341B2 - Driving machine - Google Patents

Description

The present disclosure relates to a driving machine provided with a striking portion and a counterweight.

A driving machine provided with a striking portion and a counterweight is described in Patent Document 1. The driving machine described in Patent Document 1 includes a main body, a sub body, a motor, a reduction mechanism, a compression mechanism, a shaft, a plunger, a blade, a counterweight, and a coil spring. The sub body is connected to the main body. The motor and reduction mechanism are provided in the sub body, and the compression mechanism is provided in the main body. The shaft is fixed to the main body and the plunger reciprocates along the shaft. The blade is fixed to the plunger and the counterweight moves along the shaft. The coil spring is locked to the plunger. The plunger and blade correspond to the striking part.

In the driving machine described in Patent Document 1, when the rotational force of the motor is transmitted to the plunger and the counterweight via the reduction mechanism and the compression mechanism, the plunger rises and the counterweight falls. Also, the coil spring is compressed. When the rotational force of the motor is no longer transmitted to the plunger and the counterweight, the coil spring extends, the plunger lowers, and the blade drives the pin. In addition, the counterweight rises when the plunger descends, reducing recoil and vibration during the driving operation.

Japanese Unexamined Patent Publication No. 2016-68173

However, the driving machine described in Patent Document 1 has a problem that the plunger shaft for guiding the movement of the striking portion is provided exclusively, and the weight increases.

An object of the present disclosure is to provide a driving machine capable of reducing weight.

The driving machine of one embodiment is movable with respect to the housing in the first direction and the second direction opposite to the first direction, and hits the stopper when moving in the first direction. And a counterweight that is movable in the first direction and the second direction with respect to the housing and that moves in the second direction when the striking portion moves in the first direction. The counterweight is a hammering machine and has a first guide portion that guides the movement of the striking portion in the first direction and the second direction.

In the driving machine of one embodiment, the counterweight plays a role of guiding the movement of the striking portion in addition to a role of reducing recoil and vibration during the driving operation. Therefore, it is not necessary to provide a plunger shaft for guiding the movement of the striking portion, and the weight can be reduced.

It is a side sectional view of the driving machine which is one Embodiment of this invention. It is a partial side sectional view of the driving machine shown in FIG. It is a partial side sectional view of the driving machine shown in FIG. It is a block diagram which shows the control system of a driving machine. It is a perspective view which shows the drive mechanism provided in the driving machine.

Hereinafter, an embodiment of the driving machine will be described with reference to the drawings.

The driving machine 10 shown in FIG. 1 includes a housing 11, a striking portion 12, an electric motor 14, a drive mechanism 15, a control board 16, and a counterweight 18. The striking portion 12 is provided in the housing 11. The electric motor 14 is provided in the housing 11, and the drive mechanism 15 is provided in the housing 11. The control board 16 is provided in the housing 11. The counterweight 18 is provided in the housing 11.

Further, a magazine 13 and a battery pack 17 are provided. The magazine 13 is attached to the housing 11. The battery pack 17 can be attached to and detached from the housing 11.

The housing 11 is made of metal and synthetic resin, and the housing 11 has a tubular main body portion 19, a handle 20 connected to the main body portion 19, and a motor case 21 connected to the main body portion 19. .. The mounting portion 22 is connected to the handle 20 and the motor case 21. The injection portion 23 is provided outside the main body portion 19, and the injection portion 23 is fixed to the main body portion 19. As shown in FIGS. 2 and 3, the contact member 24 is attached to the injection portion 23. An injection path 25 is provided over the injection portion 23 and the contact member 24. The injection path 25 is a passage that guides the stopper 26. The tip of the contact member 24 is pressed against the material to be driven W1.

The magazine 13 is supported by the housing 11 and the injection portion 23. The magazine 13 accommodates a plurality of fasteners 26. The fasteners 26 are connected to each other by connecting elements. The magazine 13 has a feeder. The feeder sends the stoppers 26 housed in the magazine 13 to the injection path 25 one by one.

A top holder 27 and a bottom holder 28 are provided in the main body 19. The top holder 27 and the bottom holder 28 are made of metal and are fixed to the main body 19, respectively. The top holder 27 and the bottom holder 28 are arranged in the main body 19 at intervals in the center line A1 direction. The center line A1 is a virtual line, and the bottom holder 28 is arranged between the top holder 27 and the magazine 13 in the direction of the center line A1. The plunger 40 and the counterweight 18 are arranged between the top holder 27 and the bottom holder 28 in the center line A1 direction.

The top holder 27 has a base 29 and a shaft portion 30 protruding from the base 29 toward the bottom holder 28. The bottom holder 28 has a base 31 and a shaft portion 32 protruding from the base 31 toward the top holder 27. The shaft portions 30 and 32 are arranged concentrically with the center line A1 as the center.

The counterweight 18 is an inertial body that cancels out the reaction force when the striking portion 12 moves in the center line A1 direction. The material of the counterweight 18 may be metal, non-ferrous metal, steel, or ceramic. The mass of the counterweight 18 is larger than the mass of the striking portion 12. The counterweight 18 has a base 33, a tubular portion 34, and a shaft portion 35. The tubular portion 34 is connected to the base 33, and the shaft portion 35 projects from the base 33 toward the bottom holder 28 in the center line A1 direction. The shaft portion 35 and the cylinder portion 34 are arranged concentrically with the center line A1 as the center.

The first support hole 36 and the second support hole 37 are provided in the shaft portion 35. The first support hole 36 and the second support hole 37 are arranged concentrically with the center line A1 as the center. The first support hole 36 and the second support hole 37 are arranged at different positions in the center line A1 direction. The shaft portion 30 is arranged in the first support hole 36, and the shaft portion 32 is arranged in the second support hole 37. The counterweight 18 can move in the center line A1 direction with the shaft portion 30 arranged in the first support hole 36 and the shaft portion 32 arranged in the second support hole 37. When the counterweight 18 moves in the direction of the center line A1, the counterweight 18 slides in contact with the shaft portions 30 and 32. That is, the shaft portions 30 and 32 prevent the counterweight 18 from being inclined with respect to the center line A1. A weight arm 38 is provided on the counterweight 18. The weight arm 38 is made of metal, and the weight arm 38 has a plurality of engaging portions 39.

The striking portion 12 has a metal plunger 40 arranged in the main body portion 19 and a metal driver blade 41 fixed to the plunger 40. The driver blade 41 is arranged in the center line A1 direction, and the driver blade 41 can move in the center line A1 direction in the injection path 25. The plunger 40 has a shaft hole 42, and the shaft portion 35 is arranged in the shaft hole 42. That is, the plunger 40 is attached to the outer peripheral surface of the shaft portion 35. The plunger 40 can move in the center line A1 direction with respect to the shaft portion 35 in a state of being in contact with the shaft portion 35. The shaft portion 35 holds the posture when the plunger 40 moves in the center line A1 direction. Specifically, the shaft portion 35 prevents the plunger 40 from inclining with respect to the center line A1. A plunger arm 43 is provided on the plunger 40. The plunger arm 43 is made of metal, and the plunger arm 43 has a plurality of engaging portions 67.

In FIGS. 2 and 3, moving the plunger 40 or the counterweight 18 in the direction of the center line A1 so as to approach the bottom holder 28 is referred to as descending. Moving the plunger 40 or the counterweight 18 in the direction of the center line A1 so as to approach the top holder 27 is called ascending.

A weight bumper 44 is provided between the base 29 of the top holder 27 and the counterweight 18. A plunger bumper 45 is provided between the base 31 of the bottom holder 28 and the plunger 40. Both the weight bumper 44 and the plunger bumper 45 are made of synthetic rubber.

A spring 46 is provided in the main body 19. The spring 46 is a metal compression coil spring, and the spring 46 is arranged between the base 33 and the plunger 40. The spring 46 can be expanded and contracted in the center line A1 direction. The spring 46 receives a compressive load in the center line A1 direction from the counterweight 18 and the plunger 40. The repulsive force of the spring 46 is applied to the plunger 40 and the counterweight 18. The spring 46 urges the plunger 40 in the center line A1 direction so as to approach the base 31, and the counterweight 18 in the center line A1 direction so as to approach the base 29.

The battery pack 17 shown in FIG. 1 can be attached to and detached from the mounting portion 22, and the battery pack 17 has a storage case 47 and a plurality of battery cells housed in the storage case 47. The battery cell is a secondary battery that can be charged and discharged, and any of a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, and 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 is supplied to the electric motor 14. The main body side terminal 48 is provided in the mounting portion 22, and the battery side terminal is provided in the battery pack 17. When the battery pack 17 is attached to the mounting portion 22, the main body side terminal 48 and the battery side terminal are electrically connected.

The control board 16 is provided in the mounting portion 22, and the control board 16 is provided with the controller 49 and the inverter circuit 50 shown in FIG. The controller 49 is a microcomputer having an input port, an output port, and a storage unit. The inverter circuit 50 connects and disconnects an electric circuit formed between the battery pack 17 and the electric motor 14. The inverter circuit 50 has a switching element.

As shown in FIGS. 2 and 3, a trigger 51 and a trigger switch 52 are provided on the handle 20, and when an operator applies an operating force to the trigger 51, the trigger switch 52 is turned on and the operating force applied to the trigger 51 is applied. When released, the trigger switch 52 is turned off. A position detection sensor 53 is provided in the main body 19. The position detection sensor 53 detects the position of the counterweight 18 in the center line A1 direction and outputs a signal.

The controller 49 processes the signal of the trigger switch 52 and the signal of the position detection sensor 53. The controller 49 processes the signal of the position detection sensor 53 to estimate the positions of the plunger 40 and the counterweight 18 in the center line A1 direction. The controller 49 controls the inverter circuit 50.

The electric motor 14 has a rotor and a stator, and the drive shaft 54 shown in FIG. 2 is connected to the rotor. In the electric motor 14, the drive shaft 54 rotates in the forward direction when electric power is supplied from the battery pack 17. The speed reducer 55 is arranged in the motor case 21. The speed reducer 55 has a planetary gear mechanism, an input element 56, and an output element 57, and the input element 56 is connected to a drive shaft 54. When the rotational force of the drive shaft 54 is transmitted to the reduction gear 55, the reduction gear 55 causes the rotation speed of the output element 57 to be lower than the rotation speed of the input element 56. The electric motor 14 and the speed reducer 55 are arranged concentrically with the center line A2 as the center.

The drive mechanism 15 converts the rotational force of the output element 57 into the moving force of the striking unit 12, and converts the rotational force of the output element 57 into the moving force of the counterweight 18. The drive mechanism 15 has a first gear 58, a second gear 59, and a third gear 60, as shown in FIGS. 2, 3, and 5. A gear holder 61 is provided in the housing 11, and the gear holder 61 supports the first shaft 62, the second shaft 63, and the third shaft 64. The first shaft 62 is connected to the output element 57. The first gear 58 is fixed to the first shaft 62, the second gear 59 is supported by the second shaft 63, and the third gear 60 is supported by the third shaft 64. The second gear 59 meshes with the first gear 58 and the third gear 60. As shown in FIG. 5, a plurality of cam rollers 65 are provided in the second gear 59, and a plurality of cam rollers 66 are provided in the third gear 60.

In the present embodiment, when the rotational force of the electric motor 14 is transmitted to the first shaft 62 via the speed reducer 55, the first gear 58 rotates clockwise in FIG. 5 and the second gear 59. Is rotated counterclockwise, and the third gear 60 is rotated clockwise. When the second gear 59 rotates, the cam roller 65 can engage and disengage with the engaging portion 67. When the third gear 60 rotates, the cam roller 66 can engage and disengage with the engaging portion 39.

The rotation regulation mechanism 68 shown in FIG. 1 is provided in the motor case 21. When the first gear 58 receives a rotational force in the counterclockwise direction in FIG. 5, the rotation regulation mechanism 68 prevents the drive shaft 54 from rotating due to the rotational force.

Next, an example of using the driving machine 10 will be described. When the trigger switch 52 is turned off, electric power is not supplied to the electric motor 14, and the drive shaft 54 is stopped. Further, all cam rollers 65 are released from the engaging portion 67, and all cam rollers 66 are released from the engaging portion 39. The plunger 40, which is urged by the repulsive force of the spring 46, is pressed against the plunger bumper 45 and stopped as shown in FIG. Further, the counter weight 18 urged by the repulsive force of the spring 46 is pressed against the weight bumper 44 and stopped as shown in FIG. The position where the plunger 40 is in contact with the plunger bumper 45 as shown in FIG. 2 can be grasped as a standby position or bottom dead center of the plunger 40. The position where the counterweight 18 is in contact with the weight bumper 44 as shown in FIG. 2 can be grasped as a standby position or top dead center of the counterweight 18.

When the operator presses the tip of the contact member 24 against the driven material W1 and the trigger switch 52 is turned on, electric power is supplied to the electric motor 14 and the drive shaft 54 rotates in the forward direction. The rotational force of the drive shaft 54 is amplified by the speed reducer 55 and transmitted to the output element 57, and the first gear 58 rotates clockwise in FIG.

When the first gear 58 rotates clockwise in FIG. 5, the second gear 59 rotates counterclockwise, and at least one of the plurality of cam rollers 65 and at least one of the plurality of engaging portions 67 are engaged with each other. To do. Therefore, the plunger 40 moves in the second direction B2 shown in FIG. 2 against the urging force of the spring 46. That is, the plunger 40 is separated from the plunger bumper 45, and the striking portion 12 rises. Further, when the second gear 59 rotates counterclockwise in FIG. 5, the third gear 60 rotates clockwise in FIG. 5, and at least one of the plurality of cam rollers 66 and at least one of the plurality of engaging portions 39. Engage with the pieces. Then, the counterweight 18 moves in the first direction B1 in FIG. That is, the counterweight 18 descends and separates from the weight bumper 44.

As described above, when the plunger 40 moves in the second direction B2 and the counterweight 18 moves in the first direction B1, the spring 46 is compressed and elastic energy is accumulated in the spring 46.

Then, as shown in FIG. 3, when the plunger 40 reaches the top dead center, all the cam rollers 65 are released from the engaging portion 67. Then, the striking portion 12 descends in the first direction B1 by the urging force of the spring 46, the driver blade 41 strikes the stopper 26 in the injection path 25, and the stopper 26 is driven into the material W1 to be driven. Further, the counterweight 18 reaches the bottom dead center at the same time as the plunger 40 reaches the top dead center, and all the cam rollers 66 are released from the engaging portion 39. Therefore, the counterweight 18 moves in the second direction B2 in the direction opposite to that of the striking portion 12. Therefore, the counterweight 18 suppresses the reaction force when the striking portion 12 moves in the first direction B1 and the vibration of the housing 11.

After the driver blade 41 hits the stopper 26, the plunger 40 collides with the plunger bumper 45, and the plunger bumper 45 absorbs a part of the moving energy of the striking portion 12. The controller 49 stops the electric motor 14 when the drive shaft 54 rotates by a predetermined angle from the time when the plunger 40 reaches the top dead center. Therefore, the plunger 40 stops at the bottom dead center that collided with the plunger bumper 45, that is, the standby position shown in FIG. Further, the counterweight 18 stops at the top dead center where it collides with the weight bumper 44, that is, at the standby position shown in FIG. The controller 49 processes the signal of the position detection sensor 53 to detect that the plunger 40 has reached the top dead center and that the plunger 40 has reached the bottom dead center, and controls the electric motor 14.

The top holder 27 and the bottom holder 28 serve as a guide mechanism for moving the counterweight 18 in the center line A1 direction. The counterweight 18 plays a role of suppressing the recoil due to the movement of the striking portion 12, and also serves as a guide mechanism for moving the striking portion 12 in the direction of the center line A1. Therefore, in order to move the striking portion 12 in the direction of the center line A1, it is not necessary to provide a dedicated guide mechanism, and the weight of the driving machine 10 can be reduced. Further, the number of parts provided in the housing 11 can be reduced, the man-hours for manufacturing the driving machine 10 can be reduced, and the manufacturing cost can be reduced. Further, the weight of the counter weight 18 includes the weight of the shaft portion 35 that guides the striking portion 12. Therefore, the weight of the base 33 and the cylinder portion 34 can be reduced as much as possible and the size can be reduced. Therefore, the total length of the driving machine 10 in the center line A1 direction can be shortened, and the driving machine 10 can be miniaturized.

In the present disclosure, it is also possible to grasp the position where the plunger 40 stops between the top dead center and the bottom dead center as a standby position of the plunger 40. In this case, the electric motor 14 is stopped with at least one cam roller 65 engaged with the engaging portion 67 and at least one cam roller 66 engaged with the engaging portion 39. Then, a part of the urging force of the spring 46 is transmitted to the second gear 59 via the plunger arm 43, and a clockwise rotational force is applied to the second gear 59 in FIG. A part of the urging force of the spring 46 is transmitted to the third gear 60 via the weight arm 38, and a counterclockwise rotational force is applied to the second gear 59 in FIG.

In FIG. 5, when a clockwise rotational force is applied to the second gear 59, the rotational force is applied counterclockwise to the first gear 58. That is, a rotational force is generated in the direction in which the drive shaft 54 is rotated in the reverse direction. However, in order for the rotation regulating mechanism 68 to prevent the drive shaft 54 from rotating in the reverse direction, the plunger 40 stops at a standby position away from the plunger bumper 45. Further, the position where the counterweight 18 is stopped between the top dead center and the bottom dead center is grasped as a standby position. That is, it stops at a standby position away from the weight bumper 44.

In the present disclosure, the shaft portion 35 is an example of the first guide portion. The second gear 59 and the cam roller 65 are examples of the first moving mechanism 69, and the third gear 60 and the cam roller 66 are examples of the second moving mechanism 70. The top holder 27 and the bottom holder 28 are examples of the second guide portion. The spring 46 is an example of an elastic member.

The driving machine is not limited to the above-described embodiment, and can be variously changed without departing from the gist thereof. For example, a cylindrical cylinder can be used instead of the top holder 27 as the second guide portion. In this case, a counterweight is provided in the cylinder, and the counterweight can move in the direction of the center line of the cylinder.

Elastic members include compression springs, tension springs, and synthetic rubber. When a tension spring is used, a tension spring for urging the plunger and a tension spring for urging the counterweight are provided respectively. The power source for supplying electric power to the electric motor may be either a DC power source or an AC power source.

Further, the weight arm and the plunger arm are made of a magnetic material, and a first moving mechanism for moving the striking portion by the attractive force of the electromagnet and a second moving mechanism for moving the counter weight by the magnetic attractive force of the electromagnet are provided. May be good.

Further, the electric motor is an example of a motor that transmits a rotational force to the first moving mechanism and the second moving mechanism. Motors include hydraulic motors, pneumatic motors and engines, as well as electric motors. The stopper may be either a nail with a head or a nail without a head. Stoppers include staples as well as rod-shaped nails. Further, "moving along the center line" includes the meaning of "moving in a direction parallel to the center line".

10 ... driving machine, 11 ... housing, 12 ... striking part, 18 ... counterweight, 26 ... stopper, 27 ... top holder, 28 ... bottom holder, 35 ... shaft part, 46 ... spring, 59 ... second gear, 60 ... 3rd gear, 65, 66 ... Cam roller, 69 ... 1st moving mechanism, 70 ... 2nd moving mechanism, A1 ... Center line, B1 ... 1st direction, B2 ... 2nd direction.

Claims (8)

A striking portion that is movable in the first direction with respect to the housing and a second direction opposite to the first direction and hits a stopper when moving in the first direction, and the first portion with respect to the housing. A driving machine that is movable in one direction and the second direction, and is provided with a counterweight that moves in the second direction when the striking portion moves in the first direction.
The counterweight is a driving machine having a first guide portion that guides the movement of the striking portion in the first direction and the second direction. The driving machine according to claim 1, wherein the striking portion and the counterweight can move in the first direction and the second direction along the center line of the first guide portion, respectively. The driving machine according to claim 2, wherein a second guide portion for guiding the movement of the counterweight in the first direction and the second direction is provided. A plurality of the second guide portions are arranged at intervals in the center line direction.
The driving machine according to claim 3, wherein the striking portion and the counterweight are arranged between the plurality of second guide portions in the center line direction. The first guide portion is a shaft portion arranged along the center line, and is a shaft portion.
The driving machine according to any one of claims 2 to 4, wherein the striking portion is attached to an outer peripheral surface of the shaft portion and is movable along the shaft portion. An elastic member that can be expanded and contracted along the center line is provided.
The striking portion is moved in the first direction by the urging force of the elastic member.
The driving machine according to any one of claims 2 to 5, wherein the counterweight is moved in the second direction by the urging force of the elastic member. The driving machine according to claim 6, wherein the elastic member is arranged between the striking portion and the counterweight in the direction of the center line. A first moving mechanism that moves the striking portion in the second direction against the urging force of the elastic member before the striking portion is moved in the first direction.
A second moving mechanism that moves the counterweight in the first direction against the urging force of the elastic member before the counterweight is moved in the second direction.
7. The driving machine according to claim 7.

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