JP2817634B2 - Staple feeder for electric stapler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a staple feeding device for an electric stapler, and more particularly to a staple feeding device for an electric stapler for forming and driving a linear staple.

[0002]

2. Description of the Related Art An electric stapler driven by a motor, a solenoid or the like uses a staple bent in a gate shape in advance and a linear staple formed by bonding a plurality of linear staples in parallel to form a sheet. Some use staple sheets. The staple sheets are stacked and stored in a cartridge, and mounted on a staple magazine of an electric stapler. Then, the lowermost staple sheet is supplied to the driver in front along the guide plate by an endless belt or a roller. At the time of driving, the leading staple is bent into a gate shape by the forming mechanism,
The driver penetrates the document or the like and drives it into the clincher, which is a cradle, and folds the staple legs to bind the document or the like.

The staple sheet is pressed downward by a spring or the like in the cartridge and pressed against an endless belt or roller in the electric stapler. The staple sheet is sequentially rotated by an endless belt or roller that rotates in conjunction with the driver. Sent to

[0004]

A conventional staple feeder of an electric stapler for feeding a staple sheet by an endless belt or a roller is a staple which is stacked in a staple magazine and pressed against the endless belt or a roller by a spring. The lowermost layer of the sheet is sent forward using frictional force. Therefore, the lowermost staple sheet must be sent out against the friction with the upper staple sheet, and the endless belt or roller may cause an excessive slip to be sent out, resulting in poor feeding and lacking stability. There are drawbacks.

[0005] Therefore, there arises a technical problem to be solved in order to improve the reliability by eliminating the possibility of staple feeding failure, and an object of the present invention is to solve the above problem.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a staple magazine in which a staple cartridge in which a plurality of linear staples are adhered in parallel is stacked to form a staple cartridge. An electric stapler to be used, in which a driver arm pivotally attached to a frame is swung up and down to form staples and drive into staples, and staple sheets in a staple magazine are sequentially supplied to a driver by a staple feeder. In the electric stapler, the staple magazine is vertically movably engaged with the frame, the staple magazine and the driver arm are connected via a spring to support the staple magazine, and the staple magazine is provided. A push plate insertion slot is provided on the back of the A push plate is inserted along the bottom plate of the staple cartridge, a lever is pivotally attached to the rear of the staple magazine, and the push plate is connected to the lever to form a crank movement mechanism, and the push is performed by a spring. Along with urging the plate forward, a stopper for restricting the rotation of the lever is provided on the frame, and when the staple magazine is raised, the stopper presses the lever to retreat the push plate. An electric stapler, wherein the lifting and lowering movement of the staple magazine is converted into the forward and backward movement of the push plate, and the staple sheet in the staple magazine is pressed by the push plate and sent forward. A staple feeding device is provided.

[0007]

When the drive mechanism is activated, the staple magazine, which is mounted on the frame so as to be able to move up and down and is connected to the driver arm via a spring, descends together with the driver arm and comes into pressure contact with the sheet. At the rear of the staple magazine, there is provided a crank movement mechanism using a lever and a push plate. The push plate is located at the rear end surface of the lowermost staple sheet of the staple sheets stacked in the staple magazine. A spring is interposed in the lever or the push plate to urge the push plate forward.

A stopper provided on the frame is formed so that the lever comes into contact with the staple magazine when the staple magazine is raised and is rotated. When the staple magazine is raised, the push plate is retracted at the raised position. When the staple magazine is lowered during the staple driving operation, the lever is released from the restriction by the stopper, rotates by the bias of the spring, and drives the push plate forward. The push plate reciprocates back and forth in conjunction with the raising and lowering of the staple magazine, and the push plate presses the rear end surface of the lowermost staple sheet and sends it forward.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2 show an electric stapler 1 of a clincher separation type, which is composed of a stapler section 2 disposed above and a clincher section 3 below the stapler section 2 so that staples can be driven into any position of a sheet 4. Is formed. The stapler unit 2 has a staple magazine 6 disposed at a front portion of a frame 5 and a drive mechanism such as a motor 7 and a gear 8 provided at a rear portion.

A driver arm 9 is pivotally mounted on the left and right side surfaces of the frame 5 by shafts 10, 10. A driver 11 and a forming plate 12 are mounted on the front of the driver arm 9.

A cam shaft 13 of a drive mechanism is provided between the left and right side walls of the frame 5 behind the shafts 10 and 10 of the driver arm 9 (right in FIG. 1). As shown in FIG. An elliptical cam 15 is formed on the back surface of the fitted gear 14. Then, as shown in FIG.
A driven shaft 16 that engages with the lever 5 is loosely fitted in the elongated hole 17 at the rear of the driver arm 9, and connects the driven shaft 16 and the rear end of the driver arm 9 with a tension coil spring 18. The gear 14 is driven by the motor 7 via the intermediate gears 8, 8 to swing the driver arm 9 up and down, and to move the staple magazine 6 up and down.

The staple magazine 6 has a vertical guide groove 19 formed in the front part on both left and right sides, and guide grooves 19 provided on the upper and lower guide shafts 20 on the left and right inner surfaces of the frame 5.
And the staple magazine 6 is mounted so as to be able to move up and down. A compression coil spring 21 is attached to the front of the staple magazine 6 and to the tip of the driver arm 9 above the staple magazine 6.
And the staple magazine 6 is supported by the driver arm 9. The upper surface of the staple magazine 6 is open, and the staple cartridge 22 is inserted and mounted from above.

As shown in FIG. 1, the staple magazine 6
A lever 23 is pivotally mounted on the rear part of the lever 23 so as to be able to rotate back and forth. A shaft 25 is loosely fitted in a radially elongated hole 24 provided on the upper portion of the lever 23, and a push plate 26 is coupled to the shaft 25. Push plate 2
3, the staple cartridge 6 is inserted into an insertion port 27 provided in the back plate 6a of the staple magazine 6 as shown in FIG.
2 has entered. At the front of the push plate 26, a step substantially equal to the thickness of the staple sheet 28 is formed. When the staple cartridge 22 is loaded into the staple magazine 6, the rear portion of the staple sheet 28 is placed at the forefront of the push plate 26. A tension coil spring 30 is interposed between the post 29 and the push plate 26 provided near the bottom of the staple magazine 6 to urge the push plate 26 and the lever 23 forward.

On the other hand, a stopper 31 for restricting the rotation of the lever 23 is fixed to the frame 5.
The crank portion 23a protruding rearward from the lower end of the stopper abuts on the lower surface of the stopper 31, and the push plate 26 is stopped at the rear standby position shown in FIG.

As shown in FIG. 1, a feed roller 32 located below the front end of the staple cartridge 22 is provided at the front of the staple magazine 6, and one-way is provided at both ends of a shaft 33 of the feed roller 32. A pinion 34 with a clutch is fitted. Above the one-way clutch-equipped pinion 34, pinions 35 are freely rotatably mounted and mesh with the one-way clutch-equipped pinion 34, and the pinion 35 is meshed with a vertical rack 36 provided on the frame 5 and staples. The feed roller 32 rotates in one direction as the magazine 6 moves up and down.

As shown in FIG. 1, the driver arm 9 and the staple magazine 6 are at the upper standby position,
Is set on the clincher device 3 and the motor 7 starts, the elliptical cam 15 rotates counterclockwise, and the rear portion of the driver arm 9 rises. As a result, the front portion of the driver arm 9 is lowered, and the staple magazine 6 is pressed against the sheet 4 as shown in FIG. 4, and the front portion of the driver arm 9 is further lowered while compressing the compression coil spring 21 at the front portion. The staple is driven into the sheet 4.

When shifting from the upper standby position shown in FIG. 1 to the state shown in FIG. 4, the staple magazine 6 descends, the lever 23 separates from the stopper 31, the rotation restriction is released, and the push plate 26 is pulled. By moving forward by the bias of the coil spring 30, the lowermost staple sheet 28 in the staple magazine 6 is pushed forward.
The fed staple sheet 28 is fed to the front feed roller 3.
2, the staple sheet 28 is pressed against the front inner wall surface of the staple magazine 6 in conjunction with the elevation of the staple magazine 6, and the leading staple is sequentially driven.

In one cycle of the driving operation, when the staple magazine 6 and the driver arm 9 rise from the driving state shown in FIG. 4, the rear end of the lever 23 contacts the lower surface of the stopper 31 and rotates clockwise, Push plate 2
6 retracts to the standby position shown in FIG.

As described above, the push plate 26 repeats the back and forth reciprocating motion in conjunction with the elevating and lowering of the staple magazine 6, but the rear end of the staple sheet 28 sent out is fed by the feed roller 3
Before passing the position 2, the upper staple sheet 2
8 cannot enter the front staple guide 37, so that the movement of the push plate 26 engaged with the rear end of the upper staple sheet 28 is also restricted. Is the staple guide 37
When the staple sheet 28 enters the staple sheet 28, the staple sheet 28 at the upper stage falls and is connected to the rear portion of the staple sheet 28 in use, and is continuously sent out by the movement of the push plate 26.

It should be noted that the present invention is not limited to the above-described embodiment, and that the shapes of the lever 23 and the stopper 31 can be variously modified, and that the present invention extends to those modified ones. Of course.

[0021]

According to the present invention, as described in detail in the above embodiment, the push plate is reciprocated by a crank movement mechanism utilizing the elevating operation of the staple magazine, and the rear end surface of the staple sheet is pressed by the push plate. And send it out.
Therefore, unlike conventional endless belts and rollers that rub the lower surface of the staple sheet and send it out,
The staple sheet can be sent out without slipping, and the reliability can be improved with a simple mechanism.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an electric stapler according to an embodiment of the present invention.

FIG. 2 is a plan view of a stapler section of the electric stapler shown in FIG. 1;

FIG. 3 is an enlarged view showing a staple feeding device of the electric stapler shown in FIG. 1;

FIG. 4 is a side sectional view showing a driving operation of the electric stapler shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric stapler 2 Stapler part 3 Clincher part 5 Frame 6 Staple magazine 9 Driver arm 19 Guide groove 20 Guide shaft 21 Compression coil spring 22 Staple cartridge 23 Lever 24 Long hole 25 Shaft 26 Push plate 27 Insertion opening 28 Staple sheet 30 Pulling coil spring 31 Stopper 32 Feed roller

Claims (1)

(57) [Claims] An electric stapler, wherein a staple cartridge (22) in which a plurality of linear staples are adhered in parallel and stacked on a staple cartridge (22) is loaded into a staple magazine (6), and is pivotally mounted on a frame (5). The staple is formed by swinging the driver arm (9) up and down to form staples and drive the staples, and the staple sheet (28) in the staple magazine (6) is sequentially supplied to the driver position by the staple feeder. In the electric stapler, the staple magazine (6)
Is vertically engaged with the frame (5),
The staple magazine (6) and the driver arm (9) are connected via a spring (21) to support the staple magazine (6), and a push plate (26) is provided on the back of the staple magazine (6). The push plate (26) is inserted along the bottom plate of the staple cartridge (22), and a lever (23) is pivotally attached to a rear portion of the staple magazine (22). The push plate (26) is connected to a lever (23) to form a crank motion mechanism, and the push plate (26) is urged forward by a spring (30). A stopper (31) for restricting the rotation of the lever (23) is provided. When the staple magazine (6) is raised, the stopper (31) is moved by the lever (2).
3) The pressing plate (26) is formed so as to retreat by pressing the same, and the vertical movement of the staple magazine (6) is converted into the forward and backward movement of the pressing plate (26) to convert the pressing plate (2).
6) A staple feeding device for an electric stapler, wherein the staple sheet (28) in the staple magazine (6) is pressed and sent forward.