JP2567867Y2 - Starting device for portable electric staple driving machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric staple driving machine used for construction work and the like.
It relates to the starting device.

[0002]

2. Description of the Related Art Conventionally, in a portable electric staple driving machine, a staple driver is fixed to a plunger urged in one direction by a spring, and the plunger is driven in a compression direction by a gear and a cam mechanism driven by a motor. Later, the engagement between the plunger and the cam is released, and the staple is driven into the object by the staple driver using the elastic force of the spring.

The above operation is performed by pulling a trigger lever provided on the staple driving machine, turning on the microswitch, and driving the motor. After the stapling, when the plunger is pulled up to the upper standby position, the microswitch is mechanically turned off and automatically stopped after one cycle of operation.

FIG. 11 shows a starter of a conventional portable electric staple driving machine. Reference numeral 1 denotes a trigger lever, and a front portion (left side in the figure) is pivotally mounted on a staple frame. The first lever 2 is located at the rear end of the trigger lever 1.
Are rotatably supported in the vertical direction, and the second lever 3 is pivotally mounted on the upper surface of the first lever 2 so as to be rotatable in the horizontal direction.

[0005] A stopper 2 a for regulating the rotation range of the second lever 3 is provided upright on the right end of the front end of the first lever 2.
At the left end, there is provided a hook portion 2b projecting upward and further bending in the horizontal direction. Further, a torsion coil spring 4 is interposed between the second lever 3 and its support shaft 2c, and the second lever 3 is biased counterclockwise in FIG.
To the stopper portion 2a. The push button 5a of the micro switch 5 for turning on / off the power is located above the second lever 3 in this state. The tip of the second lever 3 is bent downward to form a hook 3a. The hook 3a is located on the rear side of the gear 6 driven by a motor (not shown). A switch release pin 6a protrudes from a position displaced from the rotation center. Reference numeral 7 denotes a contact detection arm urged by a spring (not shown) so as to protrude downward from the vicinity of the ejection port of the portable electric staple driving machine. 2b, when the lower end of the contact detection arm 7 is pressed against the driving point, the upper end presses the lower surface of the hook 2b, and the first lever 2 and the second lever 3 are moved. It is turned upward to reach the state shown in FIG.

When the trigger lever 1 is pulled, the first and second levers 2 and 3 rotate upward with the hook 2b supported by the contact detection arm 7 as a fulcrum in conjunction with the rotation of the trigger lever 1. Then, the upper surface of the second lever 3 pushes the push button 5a of the micro switch 5 to start the motor. When the plunger (not shown) is unlocked by driving the motor and staples are driven in. When the plunger is pulled up again and approaches the vicinity of the top dead center, the switch release pin 6a of the gear 6 rotates to the position shown in FIG. Then, the rotation is further continued, and the hook 3a is pressed from the side to rotate. Then, the second lever 3 is rotated and the micro switch 5 is turned on.
From the position of the push button 5a of the micro switch 5
Is turned off, the motor is stopped, and the gear 6 stops at a position where the switch release pin 6a of the gear 6 has crossed over the hook 3a of the second lever 3, and the operation of one cycle ends. When the operation of the trigger lever 1 is released, the second lever 3 returns to the initial position shown in FIG.

When the ejection port of the portable electric stapling machine is not in contact with a wall or the like, the contact detection arm 7 has been moved downward, so that the first and second levers 2 and 3 are not provided.
When the trigger lever 1 is pulled in this state, the motor is not started because the upper surface of the second lever 3 does not reach the position of the push button 5a of the micro switch 5. In addition, accidental staple shooting due to erroneous operation of the trigger lever 1 is prevented.

On the other hand, before the end of one cycle, the trigger lever 1
Is turned off, the micro switch 5 is turned off at that time, and the motor stops. Then, depending on the timing at which the trigger lever 1 is turned off, the gear 6 stops at the position where the switch release pin 6a of the gear 6 has pressed and rotated the second lever 3, and the second lever 3 cannot return to the initial position. There is. In such a case, the trigger lever 1
Is operated, the motor cannot be started because the second lever 3 is not positioned immediately below the microswitch 5.

[0009]

The starting device of the conventional portable electric stapling machine has a disadvantage 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 disadvantages and to surely restart the motor regardless of the operation timing of the trigger lever to improve reliability. Aims to solve the above problems.

[0010]

SUMMARY OF THE INVENTION This invention proposes to achieve the above-mentioned object, in which a plunger biased by a spring is pulled up by a motor drive mechanism, and staples can be driven in by a lowering operation of the plunger. The portable electric staple driving machine is provided with a contact detection arm and a trigger for detecting a contact between the staple ejection port and the target to be driven, and the staple ejection port and the target to be driven come into contact with each other,
Further, in the starting device of the portable electric stapling machine, the power switch is turned on when the trigger is operated and the power switch is mechanically turned off at the end of one cycle of operation. On the trigger to be operated, the first and second levers are arranged side by side so that the rotation fulcrum is displaced back and forth so as to be vertically rotatable, and the first and second levers are each provided with a spring. The front portion is urged downward, and the second lever is urged forward by a spring using the bearing hole of the rear second lever as a long hole in the front-rear direction. Is formed on the upper part of the plunger and rotated by raising and lowering the plunger, and the front end portion of the second lever is formed on the upper part of the contact detecting arm and rotated by the raising and lowering of the contact detecting arm. And the second record Forming a cam surface in the middle portion of the chromatography,
When the rear part of the first lever rises, the rear part presses the cam surface, and the second lever retreats to constitute a cam mechanism for releasing the engagement between the second lever and the contact detection arm. And a starter in which a push button of a power switch is disposed above an intermediate portion of a rotation fulcrum of the first and second levers, wherein the contact detection arm is raised and a trigger is pulled. The power switch is turned on by raising the second lever, and when the plunger is lowered,
The first lever releases the engagement between the second lever and the contact detection arm, and the rear part of the second lever keeps the push button of the power switch on. The present invention provides a starting device for a portable electric staple driving machine.

[0011]

When the staple exit is pressed against the object, the contact detection arm is pushed in, and the front 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 raised, and the push button of the power switch is pressed 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 has been pushed up by the plunger, descends, the rear part rises, pressing the cam surface of the second lever, and retreating the second lever. At the same time, the engagement between the second lever and the contact detection arm is released, and at the same time, the rear end of the first lever presses the push button of the power switch to keep the ON state.

When the plunger is lifted after the staple has been driven, the plunger pushes up the front portion of the first lever, and the rear portion pivots downward to release the pressing of the push button of the power switch, thereby turning off the power. The plunger stops at the upper standby position.

[0013]

1 to 10 show an embodiment of the present invention.
Will be described in detail. FIG. 1 shows a portable electric staple driving machine 1
1, an elliptical hole is formed at the center of the side surface of the frame 12, which is the outer casing, to form a handle portion 12a. A trigger lever 13 is provided at the front of the handle 12a. The trigger lever 13 is urged downward by the urging of the compression spring 14 and protrudes into the oblong hole. The trigger lever 13 is operated with a forefinger. The micro switch 15 arranged above the trigger lever 13 is turned on and off. A staple magazine 16 is provided at a lower portion of the frame 12, and a plurality of portal staples are adhered to each other, and connected staples (not shown) arranged in an angle steel shape are stored in the staple magazine 16.

A motor 17 is located at the center of the frame 12.
Is disposed, and the pinion gear 1 fitted to the shaft of the motor 17 is provided.
Planet gears 20 are interposed between the gear 8 and the internal gear 19 fixed to the frame 12. Planetary gear 2
0, 20 is a rear disk portion 21 a of the intermediate pinion gear 21.
The intermediate pinion gear 21 rotates at a speed lower than the rotation speed of the motor 17 due to the revolution of the planetary gears 20, 20.

The intermediate pinion gear 21 has a pair of spur gears 22, 23 arranged in tandem on the upper side thereof and meshing with each other.
, And the upper and lower spur gears 23 and 22 are rotated in opposite directions by the rotation of the motor 17. Rollers 24 and 25 are axially mounted on the upper and lower spur gears 23 and 22 at positions displaced from the rotation center on the front surface, respectively.
Rollers 24 and 25 revolve with the rotation of.

A cylinder portion 26 is formed in front of the spur gears 22 and 23 in a vertical direction, 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 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. When the plunger 27 is lowered, the staple driver 30 protrudes downward through an ejection port 12b provided on the lower surface of the front part of the frame 12. Projections 27a and 27b projecting rearward are formed on the back surface of the plunger 27. When the spur gears 22 and 23 rotate, first, the roller 24 of the lower spur gear 22 is engaged with the lower projection 27a. The plunger 27 is pushed up to near the top dead center of the roller 24, and the staple driver 30 is pulled into the injection port 12b.
Subsequently, the roller 25 of the upper spur gear 23 is
b and the plunger 27 is further pulled upward.

When the motor 17 is further driven, the engagement between the roller 25 of the upper spur gear 23 and the projection 27b of the plunger 27 is made after the plunger 27 has slightly risen from the standby position shown in FIG. Released, plunger 2
The staple 7 is rapidly lowered by the urging of the compression coil springs 28 and 29, and the staple is fired downward from the ejection port 12b at the tip of the staple driver 30. The lowered plunger 27 is connected to a bumper 31 disposed below the cylinder 26.
The vehicle is stopped after colliding with the vehicle, and the impact at the time of collision is reduced.

Further, a guide hole 12c is formed in the front of the staple ejection port 12b so that the contact detection arm 3c is provided.
2 is mounted so as to be able to move up and down along the guide hole 12c. The middle portion of the contact detection arm 32 is bent rearward, and a compression coil spring 33 is attached to the middle portion 32a and the frame 12.
, The contact detection arm 32 is urged downward, and the lower end portion of the contact detection arm 32 is projected downward from the guide hole 12c. The contact detection arm 32 is raised further upward from the rear end of the intermediate portion 32 a and passes by the side of the spur gears 22 and 23, and the upper end 32 b is located in front of the trigger lever 13. Further, a stopper portion 32c lower than the upper end portion 32b is protrudingly provided behind the upper end portion 32b, and a second stopper portion 32 to be described later is provided.
Is formed so as to regulate the downward rotation range of the lever. It should be noted that a battery housing 1 is provided at the rear of the frame 12.
A rechargeable battery pack 34 is loaded in the battery storage section 12e to supply power.

A pair of support shafts 41 and 42 are provided in the front and rear of the trigger lever 13. An intermediate portion of the first lever 43 is inserted into the front support shaft 41, and the first lever 43 and the trigger are connected. The torsion coil spring 44 is interposed on the front wall surface of the lever 13 to urge the front portion of the first lever 43 downward. When the plunger 27 is raised to the standby position as shown in FIG. The plunger 27 contacts the lower surface of the front end portion of the first lever 43 and pushes up to rotate the first lever 43.

Further, a second support shaft 42 inserted into the rear support shaft 42 is provided.
In the lever 45, a long hole 45a in the front-rear direction is provided on the rear side surface, and the rear support shaft 42 is inserted through the long hole 45a. Then, the rear wall of the trigger lever 13 and the second lever 4
The compression coil spring 46 is interposed between the spring lever 45 and the spring receiving portion 45b provided on the side surface of the frame 5 to urge the second lever 45 forward, and the front end portion of the second lever 45 and the spring receiving portion 12d of the frame 12 With a compression coil spring 47 interposed
Of the lever 45 is urged downward. When the plunger 27 is at the standby position as shown in the figure, the front portion of the second lever 45 is positioned at the upper end 32 of the contact detection arm 32.
b.

A push button 15a of a power on / off micro switch 15 disposed above the trigger lever 13
Are the support shafts 41 of the first and second levers 43 and 45,
The starting device is configured such that it can be turned on and off at the rear upper surface of the first lever 43 or the upper surface of the intermediate portion of the second lever 45, which is located above the intermediate portion of 42. Next, the operation of the starting device will be described with reference to FIGS. The illustration of the springs 44, 46, 47 is omitted. FIG. 2 shows an initial state, in which the trigger lever 13 is off, and the contact detection arm 32 is not in contact with the target to be driven, but is protruding downward. The front portion of the first lever 43 is pushed upward by the plunger 27 at 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. .

Subsequently, when the staple ejection port is pressed against a target location, the contact detection arm 32 is pushed in, and the contact detection arm 32 pushes up the front portion of the second lever 45 as shown in FIG. Then, when the trigger lever 13 is pulled, FIG.
As shown in the figure, 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 pushes the push button 15a of the micro switch 15 on the upper surface of the intermediate portion to release the micro switch 15. Turn on. As a result, the motor 17 is started, and the plunger 27 is raised from the standby position to the upper dead center slightly above the standby position.
Is disengaged from the roller 25 of the spur gear 23 shown in FIG. 1, and the plunger 2 as shown in FIG.
7 drops sharply. At this time, the first lever 43 released from the pressing by the plunger 27 is rotated by the bias of the torsion coil spring 44, and presses the inclined surface 45c of the second lever 45 at the rear end thereof, so that the second lever 43 is pressed. 45 is retracted so that the front end portion of the second lever 45 and the contact detection arm 3
2 is released, and the push button 15a of the micro switch 15 is pressed on the rear upper surface of the first lever 43 to continue the power supply to the motor 17.

When the plunger 27 into which staples have been driven is raised again by the rotation of the spur gears 22, 23, the upper end of the plunger 27 presses the lower surface of the front end portion of the first lever 43 as shown in FIG. And the first lever 43
And the rear part of the first lever 43 descends. By this rotation, the push button 15a of the micro switch 15 is released and the micro switch 15 is turned off, the power supply to the motor 17 is cut off, and the plunger 27 stops at the standby position near the top dead center.

On the other hand, from the initial state, first, the trigger lever 13
Can be turned on, and then the contact detection arm 32 can be pushed in to start up. In this case, the trigger lever 13
Is turned on, the rear portion of the second lever 45 rises as shown in FIG.
2 is pressed against the object to be driven, as shown in FIG.
Of the lever 45 is raised and the micro switch 15
Is turned on, and thereafter, the above-described one-cycle operation is started.

When the trigger lever 13 is turned off before the operation of one cycle is completed, the plunger 27 stops below 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 raised as shown in FIG. To push up the front part of the first lever 43. The rotation of the first lever 43 releases the rearward pressing of the second lever 45 and moves forward, and the front end portion of the second lever 45 rides on the upper end 32b of the contact detection arm 32, As shown in FIG. 4, the ON state of the microswitch 15 is continued, and the staple driving operation of the next cycle is started.

On the other hand, when the trigger lever 13 is turned on while the plunger 27 in FIG. 8 is stopped below and the contact detection arm 32 is not in contact with the object, the micro lever is actuated by the first lever 43 as shown in FIG. When the switch 15 is turned on, the plunger 27 is raised to rotate the front portion of the first lever 43 upward, and stops at the standby position shown in FIG. 6 to prevent erroneous shooting of staples. Also, the trigger lever 13
If the contact detection arm 32 is pressed against the object after
From the state of FIG. 7 described above, the switch is turned on in FIG. 4, and the process continuously shifts to the next staple driving cycle.

The shapes of the levers 43 and 45 and the arrangement position of the trigger lever 13 can be variously modified without departing from the spirit of the present invention, and the present invention is modified. It goes without saying that it covers everything.

[0028]

According to the present invention, as described in detail in the above embodiment, the turning directions of the two levers for turning on / off the push button of the power switch in conjunction with the trigger coincide with the movement direction of the trigger. The lever is not displaced from the axis of the push button of the power switch unlike the conventional type. Therefore, even when the plunger is stopped 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 the start can not be disabled and the reliability can be improved. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of the portable electric staple driving machine of the present invention.

FIG. 2 is an explanatory diagram showing an operation of a 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]

 DESCRIPTION OF SYMBOLS 11 Portable electric stapling machine 12 Frame 12b Staple ejection opening 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)

(57) [Scope of request for utility model registration] 1. A portable electric staple driving machine which pulls up a plunger urged by a spring by a motor driving mechanism and drives staples by a lowering operation of the plunger. An arm and a trigger are provided so that the power switch is turned on when the staple ejection port comes into contact with the driving target 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 for a portable electric stapling machine constituted as described above, the trigger (13) operated in the ascending direction displaces the first and second levers (43, 45) at the turning fulcrums back and forth, respectively. The first and second levers (43, 45) are interposed through springs (44, 47) to urge the front part downward. And the rear second lever (4
The second lever (45) is urged forward by a spring (46) using the bearing hole of 5) as a long hole (45a) in the front-rear direction, and the front end portion of the front first lever (43) is Plunger (27) located on top of plunger (27)
The front end portion of the second lever (45) is formed above the contact detection arm (32) so as to be rotated by the vertical 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 (4
3) When the rear portion rises, the rear portion presses the cam surface (45c), and the second lever (45) retreats.
A cam mechanism for releasing the engagement between the second lever (45) and the contact detection arm (32) is formed, and is located above the intermediate portion between the pivot points of the first and second levers (43, 45). And a push button (15a) for a power switch (15), the second lever (45) being provided when the contact detection arm (32) is raised and the trigger (13) is pulled. ) Rises and the power switch (15)
Is turned on, and when the plunger (27) is lowered,
The first lever (43) releases the engagement between the second lever (45) and the contact detection arm (32), and the rear part of the second lever (45) pushes the power switch (15). A starter for a portable electric stapling machine, characterized in that the button (15a) is kept on.