WO2016174995A1

WO2016174995A1 - Driving machine

Info

Publication number: WO2016174995A1
Application number: PCT/JP2016/060936
Authority: WO
Inventors: 貴士上田; 穣伊藤; 潤遠田
Original assignee: 日立工機株式会社
Priority date: 2015-04-30
Filing date: 2016-04-01
Publication date: 2016-11-03

Abstract

In order to provide a driving machine which makes it possible to improve the responsiveness from when an operation for driving in a fastener is performed until when an action member strikes the fastener, a driving machine (10) comprises: a magazine (18) for accommodating fasteners (82); a nose part (16) having an ejection port (17) through which the fasteners (82) are supplied from the magazine (18); a rotating disc (26) for moving a piston (13) between a bottom dead center and a top dead center so as to compress a gas within a cylinder (12); and a driver blade (15) for imparting a driving force to a fastener (82) by the gas compressed by the action of the piston (13). After the driver blade (15) has driven in the fastener (82), a striking part (109) of the driver blade (15) is moved to a standby position (T1) closer to a distal end (16a) of the nose part (16) than a position where a head of the fastener (82) is supplied, until a convexity provided to a rotating body is detected.

Description

Driving machine

The present invention relates to a driving machine for operating a moving member to drive a stopper.

Patent Literature 1 discloses a driving machine that operates an operating member with air pressure in a compression chamber and drives a stopper with the operating member. The driving machine described in Patent Document 1 includes a housing and a bellows provided in the housing. The bellows is extendable, the first end of the bellows is connected to the piston, and the second end of the bellows is fixed to the housing. Compressed air is enclosed in the bellows to form a compression chamber. A driver blade is fixed to the piston. The piston and the driver blade are operating members.

Moreover, the driving machine described in Patent Document 1 includes a motor provided in the housing, a gear that transmits the rotational force of the motor to the cam, a protrusion provided on the cam, a locking portion provided on the piston, And a damper provided in the housing. Furthermore, the driving machine described in Patent Document 1 includes a push rod that is movable with respect to the housing and a trigger that is operated by an operator.

When the motor is stopped, the piston is pressed against the damper by the pressure in the compression chamber and stopped at the bottom dead center. When the push rod is pressed against the object and the trigger is operated, the cam is rotated by the rotational force of the motor, and when the protrusion is engaged with the locking part, the piston is lifted from the bottom dead center by the rotational force of the cam. Move towards the dead center. While the piston moves from the bottom dead center toward the top dead center, the bellows is compressed and the pressure in the compression chamber rises. When the piston reaches the top dead center, the protrusion is separated from the locking portion, the rotational force of the cam is not transmitted to the piston, and the piston moves from the top dead center to the bottom dead center by the pressure of the compression chamber. As a result, the driver blade strikes the stop. When the driver blade drives the stopper, the motor stops and the piston contacts the damper and stops at the bottom dead center.

JP 2014-69289 A

However, in the driving machine described in Patent Document 1, when the trigger is operated, the driver blade stopped at the bottom dead center operates toward the top dead center, and then the driver blade is moved to the top dead center. Because it moved toward the bottom dead center to drive the stop, the response was insufficient.

An object of the present invention is to provide a driving machine capable of improving the responsiveness from the operation of driving the stopper until the driver blade drives the stopper.

The invention of one embodiment includes a magazine for storing a stopper, a nose portion having a supply portion to which the stopper is supplied from the magazine, and a bottom dead center and a top dead center for compressing the gas in the cylinder. A power transmission mechanism that moves between the points, a motor that drives the power transmission mechanism, a control unit that controls the motor, and a driver that applies a driving force to the stopper by the gas compressed by the operation of the piston A blade, and after the driver blade has driven the stopper, the power transmission mechanism is rotated by the power of an electric motor, and a rotating body formed with a pinion; A rack provided on the driver blade and meshed with the pinion; a convex portion provided on the rotating body; and a sensor that detects the convex portion and detects a position of a tip of the driver blade. The control unit controls driving of the motor according to a signal from the sensor, and waits for the tip of the driver blade to be closer to the tip of the nose than the position where the head of the stopper is supplied. Move to position.

The invention of another embodiment includes a cylinder, a piston slidably accommodated in the cylinder, a magazine for accommodating a stopper, and a nose portion having an injection port to which the stopper is supplied from the magazine. A driver blade that operates with the piston to apply a driving force to the stopper, a sensor that detects a position of the driver blade, a control unit that controls the motor according to a signal from the sensor, A power transmission mechanism that is driven by power and moves the piston between a bottom dead center and a top dead center so as to compress the gas in the cylinder, and is compressed by the gas compressed by the operation of the piston A driving machine for driving the stopper with the driver blade by moving the piston from the top dead center toward the bottom dead center, and after driving the stopper, Head of the fastener to the tip of the driver blade a said injection port so as to stop at a position below the position where it is supplied, the control unit controls the motor.

In one embodiment, the tip of the driver blade stops at the standby position. Therefore, it is possible to improve the responsiveness from when the driving operation is started and the driver blade operates until the driver blade drives the stopper.

It is side surface sectional drawing of the driving machine which is embodiment of this invention, and shows the state which the driver blade protruded. It is a top view of the driving machine shown in FIG. FIG. 2 is a front sectional view taken along the line AA of the driving machine shown in FIG. 1. It is front sectional drawing which shows the state which the driver blade of the driving machine shown in FIG. 1 moved backward. FIG. 2 is a plan sectional view taken along line BB of the driving machine shown in FIG. 1. It is side surface sectional drawing which shows the position of the piston and driver blade of the driving machine of this invention. It is side surface sectional drawing which shows the position of the piston and driver blade of the driving machine of this invention. It is side surface sectional drawing which shows the position of the piston and driver blade of the driving machine of this invention. It is sectional drawing which shows the structure of the nose part in the driving machine of this invention. It is a perspective view which shows the power mechanism which operate | moves the piston and driver blade shown in FIG. (A) to (C) are cross-sectional views showing the operation of the one-way clutch provided in the reduction gear of FIG. It is a block diagram which shows the control system of the driving machine of FIG. It is a flowchart including the example of control which can be performed with the driving machine of FIG. It is a time chart corresponding to the example of control performed with the driving machine of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same code | symbol is attached | subjected to the common member.

The driving machine 10 shown in FIGS. 1 to 5 includes a housing 11, which includes a cylinder case portion 11a that accommodates a cylinder 12, and a motor case portion 11b that is integrated with the tip of the cylinder case portion 11a. It has. A handle portion 11c is integrated with the top side of the cylinder case portion 11a along the motor case portion 11b. A connecting portion 11d is integrally provided between the distal end portion of the handle portion 11c and the distal end portion of the motor case portion 11b. As described above, the housing 11 includes the cylinder case portion 11a, the motor case portion 11b, the handle portion 11c, and the connecting portion 11d. The housing 11 has two housing halves each formed of a resin such as nylon or polycarbonate, and the housing 11 is assembled by abutting the two housing halves.

A cylinder 12 is accommodated in the cylinder case portion 11a, and a piston 13 is provided in the cylinder hole 12a so as to be capable of reciprocating in the axial direction. The piston 13 reciprocates between the tip and top of the cylinder 12 with the upper end in FIG. 1 of the cylinder 12 as the top and the lower end of the cylinder 12 as the tip. The top part and the tip part of the cylinder 12 are located farthest from each other in the direction of the central axis O1 of the cylinder 12. The direction of the central axis O1 is a direction parallel to the central axis O1, that is, a direction along the central axis O1. The piston chamber 14 is defined by the cylinder hole 12 a and the top surface of the piston 13 by the piston 13. A driver blade 15 is connected to the piston 13. The housing 11 is provided with a nose portion 16, the north portion 16 is provided with an injection port 17, and the driver blade 15 is supported in the injection port 17 so as to be able to reciprocate in the direction of the central axis O 1.

A magazine 18 that houses a number of stoppers 82 is attached to the housing 11, and the stoppers 82 in the magazine 18 are supplied to the injection port 17 one by one. The stopper 82 supplied to the injection port 17 is driven into a driven member such as wood or gypsum board by the driver blade 15 connected to the piston 13. When the driving operation is performed, the operator holds the handle portion 11c and operates the driving machine 10 with the cylinder 12 facing forward.

As shown in FIG. 2, the motor case portion 11b is arranged so as to be shifted to one side in the width direction of the driving machine 10 with respect to the handle portion 11c, and the magazine 18 is arranged in the width direction opposite to the motor case portion 11b. Inclined. As shown in FIG. 1, the magazine 18 is inclined downward from the rear end portion toward the front end portion. However, the magazine 18 may be arranged at a right angle to the cylinder 12.

In the cylinder case portion 11a, there are provided a protrusion 21 that contacts the outer peripheral surface on the top side of the cylinder 12 and a protrusion 22 that contacts the outer peripheral surface on the tip end side of the cylinder 12. The

parts

21 and 22 are fixed in the cylinder case part 11a. As shown in FIGS. 3 and 4, a holder 23 having an end wall portion 23 a and a cylindrical portion 23 b is attached to the distal end portion of the cylinder 12, and the driver blade 15 passes through the end wall portion 23 a. The hole 24 is penetrated.

1 and 3 show a state where the driver blade 15 is driven out by the piston 13 and the piston 13 is in the forward limit position. The forward limit position of the piston 13 is a bottom dead center where the piston 13 is pressed against the damper 25. FIG. 4 shows a state where the piston 13 is pushed by the driver blade 15 and the piston 13 is in the retreat limit position. The backward limit position of the piston 13 is the top dead center at which the piston 13 is farthest from the damper 25. A rubber or urethane damper 25 is provided in the holder 23 to absorb the impact of the piston 13 when the piston 13 is driven to the tip of the cylinder 12. The driver blade 15 passes through a through hole 24 a provided in the damper 25.

In order to return the piston 13 to the retreat limit position shown in FIG. 4, a rotating disc 26 is provided in the motor case portion 11b. The rotating disk 26 is provided on a drive shaft 27, and the drive shaft 27 is rotatably supported by

bearings

28a and 28b attached to the motor case portion 11b as shown in FIG. A rack 31 having a plurality of rack claws 31 a is attached to the driver blade 15, and a plurality of pins 32 that mesh with the rack claws 31 a are attached to the rotating disk 26 at intervals in the circumferential direction.

As shown in FIGS. 1 and 3, the rotation center axis R of the rotary disk 26 is shifted by a distance C in the radial direction of the cylinder 12 with respect to the center axis O1 of the cylinder 12, and substantially about the center axis O1. It is a right angle. FIG. 1 shows a cross section of a portion of the rotation center axis R and a cross section of a portion of the center axis O1. The center axis O1 is an imaginary line or a center line or an axis line determined from the viewpoint of mechanical engineering, and the center axis O1 does not exist as an object.

In order to rotationally drive the rotary disk 26, an electric motor 33 is mounted in the motor case portion 11b. The electric motor 33 is an inverter motor whose rotational speed is controlled by controlling a switching element of the inverter circuit. The electric motor 33 includes a stator 33a that is fixed to the motor case portion 11b, and a rotor 33b that is rotatably provided in the stator 33a. A cooling fan 35 is attached to the motor shaft 34 provided in the rotor 33 b, and cooling air for cooling the electric motor 33 is generated in the housing 11 by the cooling fan 35. The housing 11 is provided with an unillustrated intake hole for introducing outside air and an unillustrated exhaust hole for discharging the air after cooling the motor.

A planetary gear type speed reducer 36 is mounted in the motor case portion 11 b, an input shaft 37 a of the speed reducer 36 is connected to the motor shaft 34, and an output shaft 37 b of the speed reducer 36 is connected to the drive shaft 27. The base end portion of the motor shaft 34 is rotatably supported by a bearing 38a attached to the motor case portion 11b, and the input shaft 37a to which the tip end portion of the motor shaft 34 is connected is a bearing 38b attached to the reduction gear holder 39. Is supported rotatably.

A battery 40 for supplying electric power to the electric motor 33 is detachably attached to the rear end portion of the housing 11. The battery 40 includes a housing case 40a and a plurality of battery cells (not shown) housed therein. The battery cell is a secondary battery composed of a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, a nickel cadmium battery, or the like.

The cylinder 12 is provided with a pressure accumulating container 41 outside the cylinder 12 in the axial direction. The pressure accumulating container 41 has a bottom wall portion 42 attached to the top of the cylinder 12 and extending radially outward of the cylinder 12. A cylindrical portion 44 in which the top wall portion 43 is integrated is attached to the bottom wall portion 42, and the top wall portion 43 faces the top portion and the bottom wall portion 42 of the cylinder 12. A compression chamber 45 communicating with the piston chamber 14 is formed inside the pressure accumulating vessel 41. As shown in FIG. 5, the bottom wall portion 42 is formed by a member having a circular outer peripheral surface, and the center O2 of the bottom wall portion 42 is an eccentric amount E from the center axis O1 of the cylinder 12 toward the handle portion 11c. Eccentric and the bottom wall 42 is displaced in the radial direction with respect to the cylinder 12. Therefore, the compression chamber 45 of the pressure accumulating container 41 is eccentric with respect to the central axis O 1 of the cylinder 12.

Since the cylindrical portion 44 has a larger diameter than the cylinder 12, the pressure accumulating vessel 41 is longer in the vertical direction including the cylinder 12 and the pressure accumulating vessel 41 than when the compression chamber 45 is formed on the top side of the cylinder 12. The length can be shortened. Thereby, the driving machine 10 can be reduced in size.

An annular projection 46 into which the cylindrical portion 44 is fitted is provided on the inner surface of the bottom wall portion 42, and the gap between the projection 46 and the cylindrical portion 44 is sealed by a seal member 47 a. An annular projection 48 into which the cylinder 12 is fitted is provided on the outer surface of the bottom wall portion 42, and the gap between the projection 48 and the cylinder 12 is sealed by a seal member 47b. The pressure accumulating container 41 is covered by a cover 51 attached to the cylinder case portion 11 a, and a sheet-like vibration isolating rubber 52 is incorporated between the cover 51 and the pressure accumulating container 41. Further, an annular vibration-proof rubber 53 is incorporated between the protrusion 21 and the cylinder 12.

The piston chamber 14 and the compression chamber 45 are filled with air as a gas. As shown in FIG. 1, in order to drive the piston 13, which is the tip of the cylinder 12, toward the top, the rotating disk 26 is rotated counterclockwise in FIG. 3 via the speed reducer 36 by the electric motor 33. Rotating drive. When the rotating disk 26 is rotated, the pin 32 on the downstream side in the rotation direction is sequentially engaged with the rack claw 31a shown on the lower side in FIG. 3, and the pin 32 on the most downstream side in the rotation direction is the lowermost rack claw 31a. As shown in FIG. 4, the piston 13 is driven almost to the opening at the top of the cylinder 12. Under this state, the compressed air in the piston chamber 14 enters the compression chamber 45, and the pressure of the compressed air in the compression chamber 45 becomes substantially maximum. Subsequently, when the rotating disk 26 is rotationally driven and the engagement between the pin 32 and the rack pawl 31a is released, the piston 13 is driven from the top of the cylinder 12 toward the tip by the pressure of the compressed air in the compression chamber 45. Is done. The rotation angle of the rotating disk 26 is detected by an angle detection sensor (not shown).

A push rod 54 is provided in the nose portion 16 so as to be capable of reciprocating in the axial direction. The push rod 54 is also called a contact arm. The push rod 54 is urged by the compression coil spring 55 in the direction in which the tip end protrudes. A push rod (not shown) is connected to the push rod 54. When the push rod 54 is abutted against the driven member and the push rod 54 moves backward against the spring force, a push detection sensor (not shown) is pressed by the push rod. Is activated. The handle portion 11c is provided with a trigger 56. When the trigger 56 is operated, the trigger switch 57 is activated.

A controller 58 is provided in the housing 11, and detection signals from the angle detection sensor, the pressing detection sensor, and the trigger switch 57 described above are sent to the controller 58. As shown in FIGS. 1 and 3, the trigger 56 is operated and the push rod 54 is abutted against the driven member at the forward limit position where the piston 13 is the tip of the cylinder 12. When the trigger switch 57 is turned on, the electric motor 33 is driven. Thereby, the rotary disk 26 is rotationally driven, and the piston 13 is driven to the position of the top of the cylinder 12. When the engagement between the pin 32 and the rack pawl 31a is released, the piston 13 is driven to the forward limit position by the compressed air in the compression chamber 45, and the stopper 82 is driven into the driven member by the driver blade 15.

As shown in FIGS. 3 and 4, a flange 61 that comes into contact with the damper 25 is provided at the base end portion of the driver blade 15, and a connecting portion 62 projects upward from the flange 61. When the flange 61 collides with the damper 25, the damper 25 reduces or attenuates the kinetic energy of the piston 13 and the driver blade 15. The connecting part 62 enters into a recess 63 formed in the piston 13. The connecting portion 62 is provided with a long hole 64 extending in the direction of the central axis O1. A piston pin 65 that passes through the long hole 64 is attached to the piston 13, and the long hole 64 is larger than the diameter of the piston pin 65. A retaining ring 66 is attached to the piston 13, and the retaining ring 66 comes into contact with both ends of the piston pin 65. The retaining ring 66 prevents the piston pin 65 from coming off the piston 13. A seal member 67 that seals between the piston 13 and the cylinder hole 12 a is attached to the outer periphery of the piston 13.

Thus, since the driver blade 15 is attached to the piston 13 by the piston pin 65 penetrating the long hole 64, the driver blade 15 is swingable in the radial direction of the piston 13 with respect to the piston 13. When the piston 13 is driven toward the top of the cylinder 12 via the driver blade 15 by the rotating disk 26, even if the driver blade 15 swings, it is possible to prevent the piston 13 from being applied with a radial external force. The Thereby, the piston 13 can be smoothly driven by the rotating disk 26.

In order to fill the compression chamber 45 with compressed air, a filling valve 71 is provided on the bottom wall portion 42 of the pressure accumulating vessel 41 as shown in FIG. The filling valve 71 is fixed to the bottom wall portion 42 by a nut 72 at a base end portion thereof, and a distal end portion projects below the bottom wall portion 42, that is, toward the cylinder 12. A joint portion 73 is provided at the tip of the filling valve 71, and when the compressed chamber 45 is filled with compressed air, supply ports of various compressed gas supply means such as a compressor, an air inlet, and a cylinder are connected to the joint portion 73. The filling valve 71 has a check valve incorporated therein. When the supply port of the compressed air supply means is connected to the joint portion 73, the check valve is opened and compressed gas such as compressed air is compressed. 45 is filled. When the supply port is removed from the joint portion 73, the filling valve 71 is closed by the check valve.

In order to connect the supply port to the joint 73 of the filling valve 71, the housing 11 is provided with an opening (not shown). When the driving machine 10 is assembled, compressed air is supplied to the compression chamber 45 by the compressed air supply means using the filling valve 71. Further, when the gas pressure in the compression chamber 45 decreases, compressed air is supplied to the compression chamber 45 by the pressure supply means. On the other hand, when the cylinder 12 is taken out from the housing 11, the check valve incorporated in the filling valve 71 is operated by the operation jig, and the gas in the compression chamber 45 is discharged to the outside. Alternatively, the operator may manually operate the relief valve 81 to discharge the gas in the compression chamber 45 to the outside of the compression chamber 45.

A relief valve 81 is provided on the bottom wall portion 42 in order to discharge the compressed air in the compression chamber 45 to the outside when the pressure in the compression chamber 45 exceeds a set value. This set value is set to the pressure in the compression chamber 45 necessary for driving the stopper 82 having the maximum length driven by the driving machine 10.

As shown in FIGS. 1 and 2, the filling valve 71 and the relief valve 81 are provided on the bottom wall portion 42 that protrudes outward in the radial direction of the cylinder 12. Using a space formed on the cylinder 12 side, a filling valve 71 and a relief valve 81 are arranged in the space. Thereby, it can suppress that the diameter of the cylinder case part 11a enlarges. In particular, as shown in FIG. 1 and FIG. 2, when the filling valve 71 and the relief valve 81 are arranged in the space between the handle portion 11 c and the cylinder 12, the pressure accumulating container 41 is relative to the central axis O 1 of the cylinder 12. Since they are arranged to be shifted toward the handle portion 11c, the filling valve 71 and the relief valve 81 can be arranged by effectively utilizing the space below the compression chamber 45.

The magazine 18 is attached to the nose portion 16 as shown in FIGS. 6, 7, and 8, and the magazine 18 includes a guide portion 110, a feeder 111, and a spring 112. The stoppers 82 are accommodated in the guide portion 110 in a line. The guide part 110 includes a groove and a recess that allow the stopper 82 to slide. The stopper 82 is made of metal, and the stopper 82 includes a shaft portion 82a and a head portion 82b continuous with an end portion of the shaft portion 82a. The diameter of the head portion 82b is larger than the diameter of the shaft portion 82a. The length direction of the stopper 82 and the central axis O1 indicating the operation direction of the driver blade 15 are parallel to each other. The driver blade 15 is movable in the direction of the central axis O1 within the injection port 17. The biasing force of the spring 112 is applied to the stopper 82 via the feeder 111, and the stopper 82 is supplied from the guide portion 110 to the injection port 17.

As shown in FIG. 7, the nail head extension line X1 contacting the heads 82b of the stoppers 82 accommodated in the magazine 14 is inclined with respect to the central axis O1. When the head extension line X1 is extended to the injection port 17, the supply position 17a of the injection port 17 is reached. The supply position 17a is a position of the stopper 82 in the direction of the central axis O1 when the stopper 82 located at the head in the magazine 18 is supplied to the injection port 17. Thus, the stopper 82 supplied from the magazine 18 is set in the injection port 17 so that the head 82b is located at the supply position 17a, and the driver blade 15 can drive the stopper 82.

As shown in FIG. 9, the push rod 54 is attached to the nose portion 16. The push rod 54 is movable in the direction of the central axis O1 with respect to the nose portion 16. The push rod 54 is pushed away from the damper 25 by the force of the compression coil spring 55. A guide plate 113 is provided in the nose portion 16, and a guide hole 114 is provided in the guide plate 113. A pin 115 is provided on the push rod 54, and the pin 115 is disposed in the guide hole 114. The push rod 54 is movable in the direction of the central axis O1 within the range of the guide hole 114.

As shown in FIGS. 6 to 8, a hitting portion 109 is provided at the tip of the driver blade 15, and the hitting portion 109 hits the stopper 82 and drives it into the hit target member in the process of lowering the driver blade 15. . The hitting portion 109 is formed at a position farthest from the piston 13 in the direction of the central axis O1 of the driver blade 15.

The speed reducer 36 shown in FIG. 1 includes a plurality of sets of planetary gear mechanisms, and a plurality of sets of planetary gear mechanisms are arranged in a power transmission path between the input shaft 37a and the output shaft 37b. As shown in FIGS. 10 and 11, a one-way clutch 116 that restricts the rotation of the input shaft 37a is provided. The one-way clutch 116 includes a lock cam 117, a lock ring 118, and a roller 119 interposed between the lock cam 117 and the lock ring 118. The lock cam 117 is fixed to the motor shaft 34, and the lock cam 117 has concave portions and convex portions that are alternately arranged along the rotation direction. The roller 119 is disposed in the recess and can roll between the lock cam 117 and the lock ring 118.

The speed reducer 36 includes a gear case 120, and a plurality of planetary gear mechanisms are accommodated in the gear case 120. The lock ring 118 is attached so as not to rotate with respect to the gear case 120. The one-way clutch 116 allows the input motor 37a and the lock cam 117 to rotate clockwise in FIG. That is, the torque of the electric motor 33 is transmitted to the rotating disk 26 via the speed reducer 36.

Furthermore, in the one-way clutch 116, when the electric motor 33 rotates in the reverse direction and the input shaft 37a and the lock cam 117 in FIG. 11 try to rotate counterclockwise at a speed less than a predetermined rotation speed, the roller 119 and the lock cam 117 It does not bite into the lock ring 118. That is, the one-way clutch 116 is released, and the rotation of the lock cam 117 and the input shaft 37a is allowed. That is, the torque of the electric motor 33 is transmitted to the rotating disk 26 via the speed reducer 36.

In contrast, in the one-way clutch 116, when the input shaft 37a and the lock cam 117 in FIG. 11 try to rotate counterclockwise at a speed equal to or higher than a predetermined rotation speed, the roller 119 moves between the lock cam 117 and the lock ring 118. The one-way clutch 116 is engaged. The one-way clutch 116 prevents the lock cam 117 and the input shaft 37a from rotating by the wedge action. That is, when the driver blade 15 is pushed toward the bottom dead center by the pressure applied to the piston 13 and the rotating disk 26 tries to rotate counterclockwise in FIG. 10, the one-way clutch 116 is engaged and the driver blade 15 Stop. In this way, the one-way clutch 116 is engaged or released according to the rotational speed of the lock cam 117 when the lock cam 117 is about to rotate counterclockwise in FIG.

Next, the control system of the driving machine 10 will be described with reference to FIGS. A cam plate 121 fixed to the rotating disk 26 is provided, and the outer peripheral surface of the cam plate 121 is displaced in the radial direction and is not a perfect circle. The cam plate 121 rotates counterclockwise in FIG. A first convex portion 121 A and a second convex portion 121 B are provided on the outer peripheral surface of the cam plate 121. The first convex portion 121A has corners Y1 and Y2, and the second convex portion 121B has corner portions Y3 and Y4. A wheel angle detection switch 122 is provided in the nose portion 16. The wheel angle detection switch 122 is in contact with the outer peripheral surface of the cam plate 121, and the wheel angle detection switch 122 outputs a signal corresponding to the rotation angle of the rotating disk 26.

When the wheel angle detection switch 122 detects Y3 of the second convex portion 121B of the cam plate 121, the controller 58 stops the electric motor 33 and stops the striking portion 1109 of the driver blade 15 at the standby position T1. Thereafter, when the controller 58 detects that both the push rod switch 123 and the trigger switch 57 are turned on, the controller 58 drives the electric motor 33 again and moves the striking portion 109 of the driver blade 15 to the first position G1. The pin 32 is separated from the rack 31 and the driver blade 15 is lowered to drive the stopper 82 into the wood or the like.

The first convex portion 121A of the cam plate 121 is provided to detect whether the wheel angle detection switch 122 is functioning normally and to detect whether the rotating disk 26 is rotating. . A push rod switch 123 that detects the position of the push rod 54 and outputs a signal is provided in the nose portion 16. In addition, a trigger switch 57 that detects an operation state of the trigger 56 and outputs a signal is provided. Both the wheel angle detection switch 122 and the push rod switch 123 are contact type switches.

Further, the nose portion 16 or the magazine 18 is provided with a stopper detection sensor 124 that detects the remaining amount of the stopper 82, particularly the presence or absence of the stopper 82. The stop detection sensor 124 outputs a signal based on the detection result. Further, a head detection sensor 125 is provided in the magazine 18. The head detection sensor 125 detects the position of the head 82b in the direction of the central axis O1 and outputs a signal. The stop detection sensor 124 and the head detection sensor 125 may have either a structure that contacts the stop 82 or a structure that does not contact the stop 82. The stop detection sensor 124 having a structure contacting the stop 82 includes a limit switch and a micro switch. The stopper detection sensor 124 having a structure that does not contact the stopper 82 includes a photoelectric switch and an ultrasonic switch.

Furthermore, a phase detection sensor 126 that detects the rotation angle and rotation phase of the electric motor 33 is provided. The phase detection sensor 126 includes a magnetic sensor that detects a magnetic field of a permanent magnet fixed to the motor shaft 34 of the electric motor 33 and outputs a signal.

The controller 58 provided on the control board is a microcomputer including an input port and an output port, a memory, and a calculation unit. An inverter circuit 127 is provided in a path for supplying the electric power of the battery 40 to the electric motor 33, and the controller 58 processes the signals of the switches and sensors and controls the inverter circuit 127.

The controller 58 processes the signal of the push rod switch 123 to detect whether the push rod 54 is pressed against or away from the driven member. In addition, the controller 58 processes the signal of the trigger switch 57 to detect whether the operating force is applied to the trigger 56 or whether the operating force is released. Further, the controller 58 processes the signal of the stopper detection sensor 124 to detect the presence or absence of the stopper 82, and processes the signal of the head detection sensor 125 to determine the position of the head 82b in the direction of the central axis O1. To detect. The controller 58 processes the signal of the wheel angle detection switch 122 to detect the rotation angle of the rotating disk 26 and to detect the position of the piston 13 and the position of the driver blade 15 in the direction of the central axis O1. Then, the controller 58 controls the stop, rotation, rotation direction, and rotation speed of the motor shaft 34 of the electric motor 33 based on the results of processing the signals of the sensors and switches and the data stored in the memory. .

The controller 58 executes the following control example.

(Control example 1) In this control example 1, the length of the stopper 82 is constant, and the stopper 82 supplied to the injection port 17 has the same position of the head 82b in the central axis O1 direction. Alternatively, it is assumed that the position of the head 82b is the same even if the length of the stopper 82 is different. The controller 58 stops the electric motor 33 when the push rod 54 is separated from the driven member and the operation force of the trigger 56 is released. That is, the piston 13 is pushed toward the damper 25 by air pressure, the flange 61 is pressed against the damper 25 as shown in FIGS. 3 and 6, and the piston 13 and the driver blade 15 are stopped. The striking portion 109 of the driver blade 15 is stopped at the second position G2 in the direction of the central axis O1, as shown in FIG.

Next, when the controller 58 detects that the push rod 54 is pressed against the driven member and an operating force is applied to the trigger 56, the controller 58 rotates the electric motor 33 forward. Then, the rotating disk 26 is rotated clockwise in FIG. 10 by the torque of the electric motor 33, and the piston 13 and the driver blade 15 are raised. 4 and 8, when the piston 13 reaches the top dead center and the pin 32 is detached from the rack 31, the piston 13 operates toward the bottom dead center by the air pressure of the compression chamber 45, The hitting portion 109 of the driver blade 15 hits the head 82b of the stopper 82. Further, the flange 61 of the driver blade 15 collides with the damper 25, and the damper 25 absorbs or reduces the kinetic energy of the piston 13 and the driver blade 15.

The controller 58 rotates the electric motor 33 forward even after the flange 61 collides with the damper 25. For this reason, the rotating disk 26 rotates clockwise, the pin 32 engages with the rack 31, and the driver blade 15 and the piston 13 are raised by the torque of the rotating disk 26. The controller 58 stops the electric motor 33 when the hitting portion 109 of the driver blade 15 reaches the standby position T1 as shown in FIG. 7, and prepares for the next hitting operation. The standby position T1 is between the first position G1 and the second position G2 and between the second position G2 and the head 82b in the direction of the central axis O1. The first position G1 is a position of the hitting portion 109 when the piston 13 is at the top dead center. The second position G2 is the position of the hitting portion 109 when the piston 13 is at the bottom dead center. Further, since the minimum length of the stopper 82 used in the driving machine 10 is about half of the maximum length, the hitting portion 109 is located above the center line 18b of the magazine 18 shown in FIG. Work efficiency is good. The center line 18 b is a straight line passing through the center of the magazine 18 in the length direction of the plurality of fasteners 82 accommodated in the magazine 18.

When the controller 58 detects that the push rod 54 is once separated from the driven member and the push rod 54 is pressed against the driven member in a state where the operating force is applied to the trigger 56, the controller 58 58 again executes the control described above.

As described above, the controller 58 controls the rotation angle of the electric motor 33 so that the hitting portion 109 stops between the head portion 82b and the second position G2. Then, after the next hitting operation is performed and the hitting unit 109 starts moving from the standby position T1 toward the first position G1, the hitting unit 109 hits the head 82b of the stopper 82. The responsiveness is higher than the responsiveness from when the striking portion 109 starts moving from the second position G2 toward the first position G1 until the striking portion 109 strikes the head 82b of the stop device 82. That is, the time required from the start of the hitting operation until the hitting portion 109 of the driver blade 15 hits the head 82b of the stopper 82 can be shortened as much as possible. Therefore, the driving workability of the stopper 82 by the driving machine 10 is improved.

Further, when the hitting portion 109 of the driver blade 15 is stopped at the standby position T 1, the hitting portion 109 is stopped at the injection port 17. That is, the hitting portion 109 of the driver blade 15 is in contact with the stopper 82 that is closest to the injection port 17 among the stoppers 82 held by the magazine 18. For this reason, among the stoppers 82 held by the magazine 18, the stopper 82 that is closest to the injection port 17 is not supplied to the injection port 17. Therefore, even when the driver blade 15 is lowered from the state where the hitting portion 109 is stopped at the standby position T1, it is possible to avoid the driver blade 15 hitting the stopper 82.

Thus, if the length of the stopper 82 to be used is constant, the controller 58 rotates the rotating disk 26 from the angle at which the rotating disk 26 is stopped, so that the striking portion of the driver blade 15 109 can be stopped at the standby position T1. A constant angle for rotating the rotary disk 26 can be achieved by controlling the rotation angle of the electric motor 33.

(Control Example 2) The controller 58 can execute the control example 2 when using the stoppers 82 having different lengths. When the stoppers 82 having different lengths are accommodated in the magazine 18, the stoppers 82 are supplied to the injection port 17 in a state where the positions of the tips coincide with each other in the central axis O1 direction. For this reason, when the length of the stopper 82 is different, the position of the head portion 82b in the direction of the central axis O1 is different.

When the length of the stopper 82 is different, the controller 58 detects the position of the head 82b in the direction of the central axis O1 based on the signal of the head detection sensor 125. The controller 58 controls the rotation angle of the rotary disk 26 based on the position of the head 82b in the direction of the central axis O1, so that the striking portion 109 of the driver blade 15 is always moved to the head 82b and the second position G2. Can be stopped between.

(Control Example 3) When the magazine 18 has the stopper 82, the controller 58 executes the control example 1 or the control example 2. When the controller 58 determines that the magazine 18 does not have the stopper 82, the controller 58 executes the control example 3. In the control example 3, after the stopper 82 is hit with the driver blade 15, the rotation angle of the electric motor 33 is controlled to stop the hitting portion 10 of the driver blade 15 at the second position G2 as shown in FIG. It is. That is, the driver blade 15 stops with the flange 61 in contact with the damper 25. Thus, when the controller 58 determines that the magazine 18 does not have the stopper 82, the controller 58 does not perform control to stop the striking portion 109 of the driver blade 15 at the standby position T1.

(Control Example 4) As shown in FIG. 7, the controller 58 is configured so that the push rod 54 is separated from the driven member and the trigger 56 is in a state where the striking portion 109 of the driver blade 15 is stopped at the standby position T1. When it is detected that the operating force is released, the control example 4 is executed. The control example 4 is control for stopping the hitting portion 109 of the driver blade 15 at the second position G2 as shown in FIG. The contents of Control Example 4 are as follows. In a state where the one-way clutch 116 is engaged, the controller 58 temporarily rotates the electric motor 33 once to release the one-way clutch 116. Thereafter, the controller 58 rotates the electric motor 33 in the reverse direction, rotates the rotating disk 26 counterclockwise in FIG. 10, and lowers the driver blade 15. Next, the controller 58 stops the electric motor 33 when the flange 61 contacts the damper 25 as shown in FIG.

As described above, the control example 3 and the control example 4 both stop the hitting portion 109 of the driver blade 15 at the second position G2, but stop the hitting portion 109 of the driver blade 15 at the second position G2. The conditions are different, and the contents of control performed to stop the hitting portion 109 of the driver blade 15 at the second position G2 are different.

FIG. 13 is a flowchart comprehensively showing the above control examples 1 to 4. In step S1, the controller 58 determines whether or not to perform a driving operation. When either one of the push rod switch 123 or the trigger switch 57 is on, the controller 58 determines that the driving operation is performed. The controller 58 may determine that the driving operation is performed when the main switch provided in the main body is turned on, and may determine that the driving operation is not performed when the main switch is turned off.

If the controller 58 determines Yes in step S1, it moves the striking portion 109 of the driver blade 15 at the standby position T1 and stops it in step S2. Further, in step 3 following step S2, the controller 58 determines whether or not both the push rod switch 123 and the trigger switch 57 are turned on. If the controller 58 determines Yes in step S3, it proceeds to step S4 to raise the driver blade 15 and move the striking portion 109 to the first position G1, and then lowers the driver blade 15 to drive the stopper 82. .

If the controller 58 determines No in step 3, the controller 58 proceeds to step 5 and determines whether or not the time T1 has elapsed since the hitting portion 109 was stopped at the standby position T1. If the controller 58 determines Yes in step S5, the controller 58 proceeds to step 6, lowers the driver blade 15, and stops the striking portion 109 at the second position G2. If the controller 58 determines No in step 1, the controller 58 maintains the striking portion 109 of the driver blade 15 at the second position G2.

FIG. 14 is a time chart showing an example of an output signal of the wheel angle detection switch 122. The wheel angle detection switch 122 outputs an ON signal from when the angle Y1 is detected at the rotation angle θ1 to when the angle Y2 is detected at the rotation angle θ2. The wheel angle detection switch 122 turns off the signal when the angle Y2 is detected at the rotation angle θ2. When the wheel angle detection switch 122 detects the angle Y3 at the rotation angle θ3, the wheel angle detection switch 122 outputs an ON signal. Thereafter, both the trigger switch 57 and the push rod switch 123 are turned on at the rotation angle θ4, and the stopper 82 is driven. The wheel angle detection switch 122 turns off the signal when the angle Y4 is detected at the rotation angle θ5. FIG. 14 shows an example in which the wheel angle detection switch 122 detects the angle Y4 at the rotation angle θ5. In the wheel angle detection switch 122, both the trigger switch 57 and the push rod switch 123 are turned on at the rotation angle θ4. At this point, the signal may be turned off. The on / off relationship of the output signal of the detection switch 122 may be reversed.

Here, the correspondence between the configuration described in this embodiment and the configuration of the present invention will be described. The stopper 82 is the stopper of the present invention, and the injection port 17 is the injection portion of the present invention. The direction along the central axis O1 and the direction parallel to the central axis O1 are the operation directions of the present invention, and the direction of operation from the top dead center toward the bottom dead center is the first direction of the present invention. The direction of operation from the bottom dead center toward the top dead center is the second direction of the present invention. Further, the piston 13 and the driver blade 15 are the operating members of the present invention, the head 82b is the head of the present invention, and the striking portion 109 is the striking portion of the present invention. Furthermore, the first position G1 is the first position of the present invention, the second position G2 is the second position of the present invention, and the standby position T1 is the standby position of the present invention.

Further, the compression chamber 45 is the first power mechanism of the present invention, the electric motor 33, the speed reducer 36, and the rotating disk 26 are the second power mechanism of the present invention, and the damper 25 is the stopper of the present invention. Yes, the magazine 18 is the supply mechanism of the present invention. Furthermore, the electric motor 33, the controller 58, the rotating disk 26, the speed reducer 36, and the one-way clutch 116 correspond to the control mechanism of the present invention, and the head detection sensor 125 and the controller 58 are included in the head detection unit of the present invention. The stop detection sensor 124 and the controller 58 correspond to the stop detection unit of the present invention, and the push rod switch 123, the trigger switch 57, and the controller 58 correspond to the work detection unit of the present invention.

Further, the housing 11 corresponds to the housing of the present invention, the push rod 54 corresponds to the push rod of the present invention, the trigger 56 corresponds to the trigger of the present invention, and the cylinder 12 corresponds to the cylinder of the present invention. The piston 13 corresponds to the piston of the present invention, the driver blade 15 corresponds to the blade of the present invention, the compression chamber 45 corresponds to the compression chamber of the present invention, and the electric motor 33 corresponds to the electric motor of the present invention. The speed reducer 36 and the rotating disk 26 correspond to the power transmission mechanism of the present invention, the rotating disk 26 corresponds to the rotating body of the present invention, and the pin 32 corresponds to the pinion of the present invention. The rack 31 corresponds to the rack of the present invention, and the one-way clutch 116 corresponds to the one-way clutch of the present invention.

The injection port 17 corresponds to the supply portion of the present invention, the tip 16a corresponds to the tip of the driver blade in the present invention, and the supply position 17a corresponds to the “position where the stopper is supplied” of the present invention. The first convex portion 121a and the second convex portion 121b correspond to the convex portion of the present invention, and the wheel angle detection switch 122 corresponds to the “sensor for detecting the position of the tip of the driver blade” of the present invention. The controller and the roller 58 correspond to the control unit of the present invention.

The driving machine of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, the first power mechanism of the present invention is a mechanism that generates a force that moves the operating member in the first direction. The first power mechanism may be a compression chamber formed in the bellows or an elastic member that urges the operating member by a spring force. The elastic member includes a metal spring. The second power mechanism of the present invention is a mechanism that generates a force that moves the operating member in the second direction. The second power mechanism includes a cable connected to the piston, a pulley around which the cable is wound, and a motor that rotates the pulley. The stopper hitting in the present invention may have a constant diameter.

Furthermore, in the present embodiment, a DC motor (DC inverter motor) using a battery as a power source is described, but a motor using an AC power source (AC inverter motor) limited to this may be used. Further, an AC-DC converter may be used instead of the battery to convert the commercial power supply (AC power supply) into a DC power supply and supply power to the DC motor (DC inverter motor) in the driving machine.

DESCRIPTION OF SYMBOLS 10 ... Driving machine, 11 ... Housing, 12 ... Cylinder, 13 ... Piston, 15 ... Driver blade, 17 ... Injection port, 18 ... Magazine, 25 ... Damper, 26 ... Rotary disk, 31 ... Rack, 32 ... Pin, 33 ... Electric motor, 36 ... Reducer, 45 ... Compression chamber, 54 ... Push rod, 56 ... Trigger, 58 ... Controller, 67 ... Trigger switch, 82 ... Stopper, 82b ... Head, 109 ... Strike part, 116 ... One-way clutch, 123 ... push rod switch, 124 ... stop detection sensor, 125 ... head detection sensor, G1 ... first position, G2 ... second position, T1 ... standby position, O1 ... central axis.

Claims

A magazine for storing the stopper, a nose portion having a supply portion to which the stopper is supplied from the magazine, and a power for moving the piston between the bottom dead center and the top dead center so as to compress the gas in the cylinder A driving mechanism comprising: a transmission mechanism; a motor that drives the power transmission mechanism; a control unit that controls the motor; and a driver blade that applies a driving force to the stopper by the gas compressed by the operation of the piston. The power transmission mechanism is rotated by the power of an electric motor, and the driver blade is provided with a rotating body formed with a pinion after the driver blade has driven the stopper. And a rack that meshes with the pinion, a convex portion provided on the rotating body, and a sensor that detects the convex portion and detects the position of the tip of the driver blade. In response to the signal, the control unit controls the driving of the motor to move the tip of the driver blade to a standby position closer to the tip of the nose than the position where the head of the stopper is supplied. Driving machine.
The convex portion provided on the rotating body has a first convex portion and a second convex portion, and when the sensor detects the first convex portion, the control unit determines that the standby position has been reached and stops the motor. The driving machine according to claim 1, wherein:
The driving device according to claim 1, wherein the standby position is a position closer to a tip of the nose portion than a head of the stopper.
4. The driving machine according to claim 1, wherein the standby position is above a center of the magazine and below a head of a stopper supplied from the magazine.
A push rod provided in the nose portion and a trigger operated by an operator are provided, and when the push rod and the trigger are operated, the driver blade is oriented away from the tip of the nose portion. The driving machine according to any one of claims 1 to 4, wherein after the movement, the driver blade is moved in a direction approaching a tip of the nose portion to drive the stopper.
The driving machine according to any one of claims 1 to 5, wherein the magazine has the head of the stopper arranged at a fixed position in the magazine regardless of the length of the stopper.
The driving machine according to claim 3, further comprising a stopper detection sensor that detects a position of a head of the stopper.
The driving machine according to any one of claims 1 to 7, wherein the electric motor is an inverter motor, and a control unit for controlling the electric motor is provided.
A cylinder, a piston slidably housed in the cylinder, a magazine for housing a stopper, a nose portion having an injection port through which the stopper is supplied from the magazine, A driver blade that applies a driving force to the stopper; a sensor that detects a position of the driver blade; a control unit that controls a motor by a signal from the sensor; and a motor that is driven by the power of the motor; A power transmission mechanism for moving the piston between bottom dead center and top dead center so as to compress the gas of the gas, and the piston is bottom dead from the top dead center by the gas compressed by the operation of the piston A driving machine for driving the stopper with the driver blade by moving in a point direction, and after driving the stopper, the tip of the driver blade is moved forward. As the head of the fastener to a exit is stopped at a position below the position where it is supplied, the control unit controls the motor, the fastening tool.
The driving machine according to claim 9, wherein a position where the tip of the driver blade is stopped is below the head of the stopper and above the center of the magazine.
A push rod provided in the nose portion and a trigger operated by an operator, and when both the push rod and the trigger are operated, the piston is moved to the top dead center, and thereafter The driving machine according to claim 9, wherein the piston is moved toward a bottom dead center and the stopper is driven by the driver blade.
The power transmission mechanism includes a rotating body that is rotated by the power of an electric motor and has a pinion formed thereon, and a rack that is provided on the driver blade and meshes with the pinion, and is provided on the rotating body. The driving machine according to claim 9, further comprising: a protruding portion; and a sensor that detects the position of the tip of the driver blade by detecting the protruding portion.
The driving machine according to claim 12, wherein a detection signal of the sensor is processed to control a stop position of a tip of the river blade.