JPH0737576U - Starting device for portable electric stapler - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the certainty of starting the portable electric stapler used for construction work. [Structure] The first lever 43 is provided at the front of the trigger lever 13.
And a second lever 45 on its rear part. The bearing hole of the second lever 45 is a long hole 45a that is long in the front-rear direction, and is urged forward by a spring 46. The front portions of the first and second levers 43 and 45 are urged downward by springs 44 and 47, respectively. When the contact detection arm 32 is pressed against the object, the second lever 45 is raised by the upper end of the arm 32, and when the trigger lever 13 is pulled, the micro switch 15 is turned on by the second lever 45 and the motor 17 is started. . When the plunger 27 descends, the first lever 43
Is rotated, the second lever 45 is retracted at the rear end to release the pressing of the switch 15, and at the same time, the first lever 43 is released.
Keep switch 15 on at the rear end. After the driving, the plunger 27 moves up to rotate the first lever 43 to turn off the switch 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a portable electric stapling machine used for construction work and the like, and more particularly to a starting device thereof.

[0002]

[Prior art]

 Conventionally, a portable electric stapler has a staple driver fixed to a plunger that is biased in one direction by a spring, and the gear and cam mechanism driven by a motor drive the plunger in the compression direction and then the plunger and cam. It is configured to release the engagement with and to drive the staple into the object by the staple driver using the elastic force of the spring.

The above-described operation is executed by pulling a trigger lever provided on the staple driving machine to turn on a micro switch and drive a motor. After staple driving, when the plunger is pulled up to the upper standby position, the micro switch is mechanically turned off and automatically stops after one cycle of operation.

FIG. 11 shows a conventional starting device for a portable electric stapler, 1 is a trigger lever, and a front portion (left in the figure) is pivotally attached to a staple frame. A first lever 2 is pivotally supported at a rear end portion of the trigger lever 1 so as to be vertically rotatable, and a second lever 3 is pivotally mounted on an upper surface of the first lever 2 so as to be horizontally rotatable. .

A stopper portion 2a for restricting a rotation range of the second lever 3 is provided upright on the right side of the front end portion of the first lever 2, and a hook portion 2 which protrudes upward at the left end and further bends in the horizontal direction. b is provided. Further, a torsion coil spring 4 is interposed between the second lever 3 and its support shaft 2c, and the second lever 3 is urged counterclockwise in the same figure to come into pressure contact with the stopper portion 2a of the first lever 2. ing. Further, in this state, the push button 5a of the micro switch 5 for turning on / off the power is located above the second lever 3. The front end portion of the second lever 3 is bent downward to form a hook portion 3a, which is located on the rear side of the gear 6 driven by a motor (not shown) and which is located on the rear surface of the gear 6. A switch release pin 6a is projectingly provided at a position displaced from the center of rotation. Further, 7 is a contact detection arm urged by a spring (not shown) so as to project downward from the vicinity of the ejection port of the portable electric stapler, and the upper end of the contact detection arm is a foot of the first lever 2. The lower end of the contact detection arm 7 is located below the hook portion 2b, and when the lower end portion of the contact detection arm 7 is pressed against the driving point, the upper end portion presses the lower surface of the hook portion 2b, and the first lever 2 and the second lever By rotating 3 upward, the state shown in FIG.

When the trigger lever 1 is pulled, the first and second levers 2 and 3 move upward with the hook portion 2b supported by the contact detection arm 7 as a fulcrum in association with the rotation of the trigger lever 1. When it rotates, the upper surface of the second lever 3 pushes the push button 5a of the micro switch 5 to start the motor. When the motor is driven, the plunger (not shown) is released and the staple is driven in. When the plunger is pulled up again and approaches the top dead center, the switch release pin 6a of the gear 6 rotates to the position shown in the figure. Then, the rotation is further continued, and the hook portion 3a is pressed from the side and rotated. Then, the second lever 3 is rotated and released from the position of the push button 5a of the micro switch 5, the micro switch 5 is turned off and the motor is stopped, and the switch release pin 6a of the gear 6 is moved to the second position. The gear 6 stops at a position where the lever 3 gets over the hook portion 3a, and the operation of one cycle is completed. Then, by releasing the operation of the trigger lever 1, the second lever 3 is returned to the initial position shown in the figure by the bias of the torsion coil spring 4.

Further, when the ejection port of the portable electric stapler is not in contact with the wall surface or the like, the contact detection arm 7 is moving downward, so that the front of the first and second levers 2 and 3 is moved. When the trigger lever 1 is pulled in this state, the upper part of the second lever 3 does not reach the position of the push button 5a of the micro switch 5 and the motor is not activated. Prevents accidental firing of staples due to incorrect operation of the trigger lever 1.

On the other hand, when the trigger lever 1 is turned off before the end of one cycle, the micro switch 5 is turned off at that point and the motor is stopped. Then, depending on the timing when the trigger lever 1 is turned off, the gear 6 stops at the position where the switch release pin 6a of the gear 6 pushes the second lever 3 and rotates, and the second lever 3 cannot return to the initial position. There is. In such a case, even if the trigger lever 1 is operated, the second lever 3 is not located immediately below the micro switch 5, so that it becomes impossible to start the motor.

[0009]

[Problems to be solved by the device]

 The conventional starting device for a portable electric stapler has a drawback that the motor cannot be restarted depending on the timing of turning off the trigger lever as described above. Therefore, there is a technical problem to be solved in order to eliminate the above-mentioned drawbacks and to reliably restart the motor regardless of the operation timing of the trigger lever to improve reliability. Aims to solve the above problems.

[0010]

[Means for Solving the Problems]

 This invention is proposed to achieve the above-mentioned object, and a portable electric staple driving machine in which a plunger urged by a spring is pulled up by a motor drive mechanism and a staple is driven by a downward movement of the plunger, is applied to a stapler. A contact detection arm and a trigger for detecting contact between the injection port and the driving target are provided, and the power switch is turned on when the staple injection port contacts the driving target and the trigger is operated. In a starter for a portable electric stapler, which is configured so that the power switch is mechanically turned off at the end of the cycle operation, the first and second levers are turned by the trigger operated in the ascending direction. The fulcrum is displaced forward and backward, and the fulcrums are arranged side by side so as to be pivotable upward and downward, and springs are interposed in each of the first and second levers to urge the front portion downward. Further, the bearing hole of the rear second lever is used as an elongated hole in the front-rear direction to urge the second lever forward by a belt, and the front end portion of the front first lever is located above the plunger. Then, the plunger is turned up and down, and the front end portion of the second lever is formed above the contact detection arm and is turned up and down by the contact detection arm. A cam surface is formed at an intermediate portion of the lever, and when the rear portion of the first lever moves upward, the rear portion presses the cam surface and the second lever retracts, and the second lever and the contact detection arm. A starting device which constitutes a cam mechanism for releasing the engagement with and a push button of a power switch is arranged above an intermediate portion of the pivotal fulcrums of the first and second levers. And the trigger is raised When pulled, the second lever is raised to turn on the power switch, and when the plunger is lowered, the first lever releases the engagement between the second lever and the contact detection arm, and There is provided a starting device for a portable electric stapling machine, characterized in that the rear portion of the second lever is formed so that the push button of the power switch is kept in the ON state.

[0011]

[Action]

 When the staple ejection port is pressed against the object, the contact detection arm is pushed in, and the front portion of the second lever pivotally attached to the trigger is raised by the contact detection arm. When the trigger is pulled in this state, the rear portion of the second lever is lifted and the push button of the power switch is pushed by the upper surface of the second lever to start the motor. When the motor starts and the plunger falls, the front part of the first lever, which was pushed up by the plunger, descends and the rear part rises, pressing the cam surface of the second lever, and the second lever. Is released to disengage the second lever from the contact detection arm, and at the same time, the rear end of the first lever presses the push button of the power switch to continue the ON state.

When the plunger is lifted after driving the staples, the plunger pushes up the front part of the first lever and the rear part pivots downward, releasing the push button of the power switch and shutting off the power. Then, the plunger stops at the upper standby position.

[0013]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a portable electric stapler 11 in which an elliptical hole is formed in a central portion of a side surface of a frame 12 which is an outer casing to form a grip portion 12a. A trigger lever 13 is provided in front of the handle 12a. The trigger lever 13 is biased downward by the biasing force of the compression spring 14 to project into the elliptical hole, and the trigger lever 13 is operated by the index finger. The micro switch 15 arranged above the trigger lever 13 is turned on and off. A staple magazine 16 is provided in the lower portion of the frame 12, and a large number of gate-shaped staples are bonded and connected staples (not shown) aligned in an angle steel shape are stored in the staple magazine 16.

A motor 17 is arranged in a central portion of the frame 12, and planetary gears 20, 20 are interposed between a pinion gear 18 fitted to a shaft of the motor 17 and an internal tooth ring gear 19 fixed to the frame 12. It is equipped. The planetary gears 20 and 20 are rotatably attached to the rear disk portion 21a of the intermediate pinion gear 21, and the intermediate pinion gear 21 rotates at a speed lower than the rotation speed of the motor 17 by the revolution of the planetary gears 20 and 20.

The intermediate pinion gear 21 meshes with a lower spur gear 22 of a pair of spur gears 22 and 23 that are arranged in a row in the upper portion and mesh with each other, and the rotation of the motor 17 causes the upper and lower spur gears 23 and 22 to rotate. Rotate in reverse. Rollers 24 and 25 are axially mounted on the upper and lower spur gears 23 and 22, respectively, at positions displaced from the center of rotation of the front surface, and the rollers 24 and 25 revolve as the spur gears 22 and 23 rotate.

A cylinder portion 26 is formed vertically in front of the spur gears 22 and 23, and a plunger 27 is loosely fitted in the cylinder portion 26. Compression coil springs 28 and 29 are interposed between the inner top surface of the cylinder portion 26 and the plunger 27 to urge the plunger 27 downward. A plate-shaped staple driver 30 is fixed to the front surface of the plunger 27, and when the plunger 27 descends, the staple driver 30 projects downward through an ejection port 12b provided on the lower surface of the front portion of the frame 12. Further, convex portions 27a and 27b projecting rearward are formed on the back surface of the plunger 27, and when the spur gears 22 and 23 rotate, the roller 24 of the lower spur gear 22 first engages with the lower convex portion 27a. And pushes the plunger 27 up to near the top dead center of the roller 24, and the staple driver 30 is drawn into the firing outlet 12b. Then, the roller 25 of the upper spur gear 23 engages with the upper convex portion 27b to pull the plunger 27 further upward.

When the motor 17 is further driven, the roller 25 of the upper spur gear 23 and the convex portion 27b of the plunger 27 are engaged with each other after the plunger 27 has moved up slightly from the standby position shown in FIG. After being released, the plunger 27 is rapidly lowered by the urging of the compression coil springs 28 and 29, and the staple is ejected downward from the ejection port 12b at the tip of the staple driver 30. The lowered plunger 27 collides with a bumper 31 arranged at a lower portion of the cylinder portion 26 to be stopped, and the impact at the time of collision is moderated.

Further, a guide hole 12c is further formed in the front portion of the staple ejection port 12b, and a contact detection arm 32 is mounted so as to be vertically movable along the guide hole 12c. The middle portion of the contact detection arm 32 is bent rearward, and a compression coil spring 33 is interposed between the middle portion 32a and the frame 12 to urge the contact detection arm 32 downward so that the lower end of the contact detection arm 32 can be urged. The part is projected downward from the guide hole 12c. The contact detection arm 32 is erected further upward from the rear end of the intermediate portion 32a and passes laterally of the spur gears 22 and 23, and the upper end portion 32b is located in front of the trigger lever 13. Further, a stopper portion 32c, which is located at a position lower than the upper end portion 32b, is provided behind the upper end portion 32b so as to restrict a downward rotation range of a second lever described later. A battery storage 12e is provided at the rear of the frame 12, and a rechargeable battery pack 34 is loaded in the battery storage 12e to supply power.

Inside the trigger lever 13, a pair of support shafts 41 and 42 are provided at the front and rear, and an intermediate portion of the first lever 43 is inserted into the front support shaft 41 so that the first lever 43 and the trigger lever 13 are connected to each other. The front portion of the first lever 43 is urged downward by interposing a torsion coil spring 44 on the front wall surface of the bar 13, and when the plunger 27 is raised to the standby position as shown in FIG. The plunger 27 abuts against the lower surface of the front end portion of the first lever 43 and pushes it up to rotate the first lever 43.

The second lever 45 inserted into the rear support shaft 42 is provided with a front and rear long hole 45a on the rear side surface, and the rear support shaft 42 is inserted through the long hole 45a. . The compression coil spring 46 is interposed between the rear wall of the trigger lever 13 and the spring receiving portion 45b provided on the side surface of the second lever 45, and the second lever 45 is biased forward. A compression coil spring 47 is interposed between the front end portion of the second lever 45 and the spring receiving portion 12d of the frame 12 to urge the front portion of the second lever 45 downward. The front portion of the second lever 45 is in pressure contact with the upper end portion 32b of the contact detection arm 32 when the plunger 27 is in the standby position as shown in FIG.

Further, the push button 15 a of the power-on / off microswitch 15 disposed above the trigger lever 13 is located above the intermediate portion of the support shafts 41 and 42 of the first and second levers 43 and 45. Then, the starting device is configured so that it can be turned on and off at the upper surface of the rear portion of the first lever 43 or the upper surface of the intermediate portion of the second lever 45. Next, the operation of the starting device will be described with reference to FIGS. The springs 44, 46 and 47 are not shown. FIG. 2 shows an initial state in which the trigger lever 13 is off, the contact detection arm 32 is not in contact with the driving target, and is in a state of protruding downward. The front portion of the first lever 43 is pushed upward by the plunger 27 in the standby position, and the second lever 45 is pressed against the upper end portion 32b of the contact detection arm 32 by the bias of the compression coil spring 47. There is.

Subsequently, when the staple ejection port is pressed to a desired place, the contact detection arm 32 is pushed in, and the contact detection arm 32 pushes up the front part of the second lever 45 as shown in FIG. Then, when the trigger lever 13 is pulled, as shown in FIG. 4, the rear portion of the second lever 45 rises with the front end portion supported by the contact detection arm 32 as a fulcrum, and the microswitch 15 of the micro switch 15 is placed on the upper surface of the intermediate portion. The push button 15a is pressed to turn on the micro switch 15. As a result, the motor 17 is started, and after the plunger 27 is lifted from the standby position to the upper dead center slightly above, the convex portion 27b above the plunger 27 and the roller 25 of the spur gear 23 shown in FIG. Is disengaged, and the plunger 27 rapidly descends as shown in FIG. At this time, the first lever 43 released from the pressing by the plunger 27 is rotated by the biasing force of the torsion coil spring 44, and its rear end portion presses the inclined surface 45c of the second lever 45, and The lever 45 of the second lever 45 is retracted to release the engagement between the front end portion of the second lever 45 and the contact detection arm 32, and at the same time, the push button 15a of the micro switch 15 is pushed on the rear upper surface of the first lever 43. The power supply to the motor 17 is continued.

Then, when the plunger 27 in which the staple has been driven is lifted again by the rotation of the spur gears 22 and 23, the upper end of the plunger 27 is moved to the front end of the first lever 43 as shown in FIG. The lower surface of the part is pressed to rotate the first lever 43, and the rear portion of the first lever 43 descends. By this rotation, the push button 15a of the micro switch 15 is released, the micro switch 15 is turned off, the power supply to the motor 17 is cut off, and the plunger 27 is stopped at the standby position near the top dead center.

On the other hand, it is also possible to first turn on the trigger lever 13 from the initial state and then push in the contact detection arm 32 to start it. In this case, when the trigger lever 13 is turned on, the rear portion of the second lever 45 rises as shown in FIG. 7, and when the contact detection arm 32 is pressed against the driving target from this state, it is shown in FIG. As described above, the front portion of the second lever 45 is lifted to turn on the micro switch 15, and thereafter, the operation of one cycle described above is started.

When the trigger lever 13 is turned off before the completion of the operation of one cycle, the plunger 27 stops downward as shown in FIG. In this case, if the contact detection arm 32 is pushed in as shown in FIG. 9 and the trigger lever 13 is turned on again, the micro switch 15 is turned on by the first lever 43, and the plunger 27 is turned on as shown in FIG. Ascends and pushes up the front part of the first lever 43. By the rotation of the first lever 43, the backward pressing of the second lever 45 is released and the second lever 45 moves forward, and the front end portion of the second lever 45 rides on the upper end portion 32b of the contact detection arm 32. As shown in FIG. 4, the ON state of the micro switch 15 is continued to start the staple driving operation of the next cycle.

On the other hand, when the trigger lever 13 is turned on in a state where the plunger 27 of FIG. 8 is stopped below and the contact detection arm 32 is not in contact with the object, the micro lever is moved by the first lever 43 as shown in FIG. The switch 15 is turned on, the plunger 27 is raised and the front portion of the first lever 43 is rotated upward, and stopped at the standby position shown in FIG. 6 to prevent accidental firing of staples. If the contact detection arm 32 is pressed against the object after the trigger lever 13 is operated, the state shown in FIG. 7 is switched to the switch-on state shown in FIG. 4, and the staple driving cycle of the next cycle is continuously entered. .

The shapes of the levers 43 and 45, the disposition position of the trigger lever 13 and the like can be modified in various ways without departing from the spirit of the invention, and the invention is modified accordingly. It goes without saying that it extends to things.

[0028]

[Effect of device]

 In this invention, as described in detail in the above-mentioned one embodiment, the turning directions of the two levers for turning on / off the push button of the power switch in synchronization with the trigger are made coincident with the movement direction of the trigger. Therefore, unlike the conventional type, the lever is not displaced from the shaft center of the push button of the power switch. Therefore, even if the plunger stops at any position due to the trigger off timing, the push button of the power switch can be reliably turned on by the trigger on operation, and it is possible to improve the reliability without causing the start failure. Can contribute.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a portable electric stapler of the present invention.

FIG. 2 is an explanatory diagram showing the operation of the starting device.

FIG. 3 is an explanatory diagram showing the operation of the starting device.

FIG. 4 is an explanatory diagram showing the operation of the starting device.

FIG. 5 is an explanatory diagram showing the operation of the starting device.

FIG. 6 is an explanatory diagram showing the operation of the starting device.

FIG. 7 is an explanatory diagram showing the operation of the starting device.

FIG. 8 is an explanatory diagram showing the operation of the starting device.

FIG. 9 is an explanatory diagram showing the operation of the starting device.

FIG. 10 is an explanatory diagram showing the operation of the starting device.

FIG. 11 is an explanatory view showing a conventional starting device.

[Explanation of symbols]

 11 Portable Electric Stapling Machine 12 Frame 12b Staple Ejection Port 13 Trigger Lever 15 Micro Switch 15a Push Button 17 Motor 27 Plunger 32 Contact Detection Arm 32b Upper End 41, 42 Support Shaft 43 First Lever 44 Torsion Coil Spring 45 Second Lever 45a Long hole 45b Spring receiving portion 45c Cam surface 46, 47 Compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A contact detection for detecting a contact between a staple ejection port and a driving target in a portable electric staple driving machine in which a plunger driven by a spring is pulled up by a motor drive mechanism and a staple is driven by a downward movement of the plunger. An arm and a trigger are provided, so that the power switch is turned on when the staple ejection port and the driving target are in contact with each other and the trigger is operated, and the power switch is mechanically turned off at the end of one cycle of operation. In the starting device of the portable electric stapler configured as described above, the first and second levers (43, 45) are moved forward and backward by the trigger (13) operated in the ascending direction. The first and second levers (43, 45) are respectively provided with springs (44, 47) which are arranged side by side so as to be rotatable in the vertical direction, and urge the front part downward. , And the rear second lever (4
The bearing hole of 5) is used as the longitudinal hole (45a) in the front-rear direction to urge the second lever (45) forward by the spring (46), and the front end portion of the front first lever (43) is Located on top of the plunger (27) Plunger (27)
And the front end portion of the second lever (45) is located above the contact detection arm (32) and is rotated by the up and down movement of the contact detection arm (32). , A cam surface (45c) is formed at an intermediate portion of the second lever (45), and the first lever (4c) is formed.
3) As the rear portion rises, the rear portion presses the cam surface (45c) and the second lever (45) retracts,
A cam mechanism for releasing the engagement between the second lever (45) and the contact detection arm (32) is formed, and above the intermediate portion of the rotation fulcrum of the first and second levers (43, 45). A starting device in which a push button (15a) of a power switch (15) is arranged in the second lever (45) when the contact detection arm (32) is raised and the trigger (13) is pulled. ) Rise, the power switch (15)
Is turned on, and when the plunger (27) descends,
The engagement between the second lever (45) and the contact detection arm (32) is released by the first lever (43), and the power switch (15) is pushed by the rear portion of the second lever (45). A starting device for a portable electric stapling machine, characterized in that the button (15a) is formed so as to be kept on.