JPH0725039B2 - Sheet staple feeding device for electric stapler - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet staple feeding device in an electric stapler that sequentially ejects sheet staples from a cartridge in which sheet staples are stacked and stored and sends the staples to a predetermined position.

(Prior art and its problems) In an electric stapler of a type in which straight staples are connected in a sheet shape to sequentially form a U-shaped sheet staple from the staple at the front end and then the staples are formed from a certain position. It is necessary to feed to the embossing section, and therefore some feeders are implemented. For example, JP-A-62-79977 and JP-A-63-12008.
As disclosed in Japanese Patent Laid-Open No. 6-63080, a feeding device that feeds staples one by one by engaging and swinging a feeding claw with staples, and Japanese Laid-Open Patent Publication Nos. 61-76312 and 62-266080.
As shown in Japanese Patent Publication, there is known a feeder for continuously feeding staples by an endless belt.

In the former case, the feeding amount by the feeding means must be set so as to correspond to one staple, so that highly accurate processed parts and assembly management are required.

In the latter case, there is no means to adjust the frictional force between the endless belt and the sheet staple in the cartridge, so that the optimum frictional force is generated between them in advance so that the cartridge storage part of the magazine and the endless belt drive device. It is necessary to assemble and adjust the parts. Further, the endless belt is easily worn.

(Object of the Invention) The present invention solves the above-mentioned problems, and provides a sheet staple feeding device in an electric stapler capable of feeding a sheet staple smoothly and surely without requiring highly accurate parts management and assembly adjustment. The purpose is to do.

(Means for Achieving the Purpose) In order to achieve the above object, a sheet staple feeding device in an electric stapler according to the present invention is a cartridge in which sheet staples formed by connecting straight staples in a sheet shape are stacked and housed. In a sheet staple feeding device that is attached to an electric stapler magazine and is drawn out sequentially from the lowermost sheet staple in the cartridge along a staple guide formed by the magazine,
The magazine is provided with a ratchet wheel that rotates only in the same direction in conjunction with a driving mechanism that drives a staple ejection driver, and the front guide roller and the rear feed roller that rotate in the same direction by the ratchet wheel are respectively provided in the staple guide. The front feed roller is disposed in the front and rear portions of the cartridge, the rear feed roller is brought into contact with the lower surface of the lowermost sheet staple in the cartridge, and a driven feed roller that faces the front feed roller with the sheet staple on the staple guide interposed therebetween is provided. It is characterized by being provided.

(Operation and Effect of the Invention) In the above configuration, when the ratchet wheel is rotated by the driving mechanism of the staple ejection driver, the front feed roller and the rear feed roller rotate in the same direction, so that the lowermost sheet in the cartridge is rotated. The staples are drawn out of the cartridge by contact friction with the rear feed roller, are supported by the staple guides of the magazine, and are fed forward. Further, the sheet staple is introduced between the front feed roller and the driven roller, and is fed further forward by the front feed roller.

As described above, since the ratchet wheel that interlocks with the drive mechanism that drives the staple ejection driver rotates the feeding roller intermittently to feed the sheet staple, unlike the continuous feeding method, the roller does not wear. It is small, and the amount of staples fed by one rotation of the ratchet wheel can be easily achieved by about several. Moreover, the drive mechanism of the driver is reciprocating, and the intermittent motion of the ratchet wheel is such that the engaging means engaging with the ratchet engages in such a way that it moves in one direction and engages when moving in the opposite direction. It is performed by the reciprocating motion of the ratchet wheel in the circumferential direction of returning without being moved. Therefore, the drive mechanism of the driver and the intermittent rotation of the ratchet wheel can be mechanically interlocked, and the device structure therefor can be simplified.

Further, the friction between the front feeding roller and the sheet staple is increased by the driven feeding roller, and the feeding force becomes strong. Therefore, it is possible to feed the sheet staple smoothly and surely with a simple structure without requiring highly accurate processed parts or assembly adjustment.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electric stapler according to the present invention. This electric stapler is for ejecting after forming a sheet staple 1 formed by connecting straight staples into a sheet shape into a U shape, and sequentially ejecting from the cartridge 2 in which the sheet staples 1 are stacked and accommodated to the front end of the magazine 3. Equipped with a feeding device. The front end of the magazine 3 is covered with a face plate 49, and the face plate 49
The punched-out portion is formed on the back surface of the. The face plate 49 in FIG. 1 is shown in an open state so that the front of the magazine can be seen.

The sheet staples 1 are stacked and stored in a box-shaped cartridge 2. As shown in FIG. 2, the lower surface of the cartridge 2 is open, and the lowermost sheet staple 1a is supported by the protrusions 2a formed on both side walls of the cartridge 2. The lower surface opening 7a of the cartridge 2 is continuous with the outlet 7b of the lowermost sheet staple 1a formed at the lower end of the front wall. The cartridge 2 is replaceably mounted in a predetermined position of the magazine 3.

The magazine 3 is arranged and fixed inside the upper part of the base 11 having a U-shaped plane.

Next, as shown in FIGS. 1 and 4, the staple feeding device is provided with a ratchet wheel 20 that rotates only in the same direction by a drive mechanism, and is provided coaxially with the ratchet wheel 20 and the seat staple 1 described above. A front feed roller 21 located below the rear feed roller 22 that contacts the lower surface of the lowermost sheet staple 1a in the cartridge 2 and rotates in the same direction as the front feed roller 21.
And a driven feed roller 23 disposed to face the front feed roller 21 with the sheet staple 1 interposed therebetween.

The ratchet wheel 20 is arranged outside the base 11. The front feed roller 21 and the rear feed roller 22 are arranged in the magazine 3 so that the upper surfaces of the front and rear rollers 21 and 22 project along the staple guide 18 and slightly above. The rear feed roller 22 is arranged below the cartridge storage unit 16 and in contact with the lower surface of the lowermost sheet staple 1a in the cartridge 2 attached to the storage unit 16.

Coaxial with the front feed roller 21 and ratchet wheel 20,
As shown in FIG. 1, a first gear 24 is provided, and the first gear 24 is meshed with an intermediate gear 25 and a second gear 26 provided coaxially with the rear feed roller 22. There is.

The driven feed roller 23 is arranged above the front feed roller 21 and is axially attached to both inner walls of the magazine 3.

When the cartridge 2 is accommodated in the cartridge accommodating portion 16 of the magazine 3 in the feeding device configuration, as shown in FIG. 2, the upper surface of the rear feeding roller 22 strongly extends from the lower opening of the cartridge 2 to the lower surface of the lowermost sheet staple 1a. Abut. Then, when the ratchet wheel 20 is rotated, the rear feed roller 22 also rotates in the same direction as the front feed roller 21 by the rotation transmission by the first gear 24, the intermediate gear 25 and the second gear 26 shown in FIG. . Therefore, as shown in FIG. 2, the lowermost sheet staple 1a is pulled out of the cartridge 2 by the contact friction with the rear feed roller 22, is supported by the staple guide 18 of the magazine 3, and is fed forward. Further, the sheet staple 1 is introduced between the front feeding roller 21 and the driven feeding roller 23, and is fed further forward by the front feeding roller 21. In this case, since the sheet staple 1 is strongly pressed against the front feed roller 21 by the driven feed roller 23, the feed force by the front feed roller 21 is very strong. In this way, the sheet staple 1 is sent to the forming portion at the front end of the staple guide 18 through the opening formed in the front wall 13 of the magazine 3.
Further, it is supplied to the embossed portion formed on the face plate 49.

If the spring member 9a is attached to the lowermost part of the elastic piece 9 and the driven feed roller 23 is pressed downward by the spring member 9a when the cartridge 2 is mounted, the front feed roller 21 and the sheet staple 1 are separated from each other. Friction force can be adjusted and feed can be adjusted.

The drive mechanism that rotationally drives the ratchet wheel 20,
A pair of drive links on a support shaft 30 provided on both outer sides of the base 11.
31a and 31b are pivotally supported, and a gear 32a provided on the output shaft of the electric motor provided on the rear portion of the base 11 is meshed with a drive gear 33 via a reduction gear 32 provided on one side of the base 11. The eccentric shaft 36 provided in the drive gear 33 is linked to the drive link 31.
It is slidably housed in a cam groove 37 formed in the rear part of a, and an engaging claw 3 is provided at the front end of one drive link 31a.
8 is pivotally supported. The engaging claw 38 is constantly urged by a spring (not shown) so as to be engaged with the ratchet wheel 20.

When the electric motor is rotationally operated, the rotational force of its output shaft is transmitted to the drive gear 33 via the gear 32a and the reduction gear 32, and the eccentric shaft 36 causes the pair of drive links 31a and 31b to rotate in accordance with the rotation.
It slides along the cam groove 37 at the rear end, whereby the drive links 31a and 31b swing vertically about the support shaft 30. Along with this, the engaging claw 38 also moves up and down (see FIG. 3). At that time, the ratchet wheel 20 is engaged with the ratchet wheel 20 at the lower moving end, and the ratchet wheel 20 is rotated by a certain rotation angle when moving upward. This allows the front feed roller to
21 and the rear feed roller 22 rotate in the same direction at the same time. When the engaging pawl 38 moves downward again, it does not engage with the ratchet, so the ratchet wheel 20 rotates in the same direction only when the engaging pawl 38 moves upward.

It should be noted that the amount of staples fed by one rotation operation of the ratchet wheel 20 may be about six.

The drive mechanism is not limited to the link mechanism, and may be, for example, a drive mechanism using a solenoid that moves up and down.

Further, the drive transmission means for the front feed roller and the rear feed roller are not limited to gears. It may be a belt.

Next, the sheet staple supplied to the front end of the magazine by the above-mentioned feeding device is formed into a U-shape by a forming mechanism (not shown), and then supplied to the punching portion on the back surface of the face plate 49, and is bound by the driver 5 to be bound material. Struck out by. The driver 5 is driven by the drive mechanism of the ratchet wheel 20, and the ratchet wheel 20 is configured to interlock with the drive mechanism of the driver 5.

That is, the driver 5 is arranged on the front surface of the front wall 13 of the magazine 3 and is supported by the support rod 45 slidably supported by the guide groove 14 in the front portion of the magazine 3. Both ends of the support rod 45 are housed in the long holes 46 at the front ends of the drive links 31a and 31b. As a result, the ratchet wheel 20 rotates as the drive links 31a and 31b swing up and down, and at the same time, the support rods are rotated.
Along with 45, the driver 5 is driven vertically along the front wall 13 of the magazine, and when movable, the staples supplied to the above-mentioned ejection portion penetrate the material 6 to be bound, hit the clincher 51, and are bent, and the binding is completed.

As described above, when the sheet staples 1 are fed by the feed rollers 21 and 22 in conjunction with the driving mechanism for driving the staple ejection driver 5, unlike the continuous feeding method, the abrasion of the rollers is small, and The number of staples to be fed depending on the amount of rotation can be easily achieved.

Further, the friction between the front feeding roller 21 and the sheet staple 1 is increased by the driven feeding roller 23, and the feeding force becomes strong. Therefore, it is possible to feed the sheet staple smoothly and surely with a simple structure without requiring highly accurate processed parts or assembly adjustment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an electric stapler according to the present invention, FIG. 2 is a central longitudinal sectional view of a main part of the electric stapler, FIG. 3 is a drive mode explanatory view of a ratchet, and FIG. It is a top view of the principal part of a stapler. Reference numeral 1 ... sheet staple, 2 ... cartridge, 3 ... magazine, 5 ... driver, 18 ... staple guide, 21 ... front feed roller, 22 ... rear feed roller, 23 ... driven feed roller

Claims (1)

[Claims] 1. A staple having a stack of sheet staples formed by connecting straight staples in a sheet shape and mounted in a magazine of an electric stapler, and a magazine formed sequentially from the lowermost sheet staple in the cartridge. In a sheet staple feeding device that is guided out along a guide, a ratchet wheel that rotates only in the same direction in association with a drive mechanism that drives a staple driving driver is provided in the magazine, and the ratchet wheel rotates in the same direction by the ratchet wheel. A partial feed roller and a rear feed roller are arranged in the front and rear portions of the staple guide, respectively, and the rear feed roller is brought into contact with the lower surface of the lowermost sheet staple in the cartridge, and the staple guide is attached to the front feed roller. Pinch the upper sheet staple A sheet staple feeding device in an electric stapler, characterized in that a driven feed roller facing each other is provided.