JP2663799B2 - Staple feeding device 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 feeder for feeding the lowermost staples out of sheet staples accommodated in a staple cartridge mounted on a magazine of an electric stapler, in front of the staple cartridge. .

[0002]

2. Description of the Related Art Conventional feed mechanisms of this type include:
Feeding means is provided by a feed belt or a feed roller provided in the magazine facing the bottom opening of the staple cartridge, and the lower surface of the lowermost sheet-like staple in the staple cartridge is brought into strong contact with the feed means to feed the staples. It is known that the means is driven by an electric motor to derive the sheet staple from the staple cartridge and send it to the front end of a magazine (Japanese Utility Model Publication No. 1-26722, etc.).

However, in these staple feeding mechanisms, the feeding force usually depends on the frictional resistance between the lowermost sheet staple and the feeding means. If the frictional resistance is large, it can be sent reliably. However, the sheet-like staples stored in a stacked state in the staple cartridge are urged downward by spring pressure from above, so that a large frictional resistance acts between the upper and lower sheet-like staples, and the staple cartridge. A part of the adhesive bonding the staples in the inside may be bonded to the upper or lower sheet staple, or a part of the sheet staple may be caught on the upper or lower sheet staple. . In such a case, in order to separate the lowermost sheet-like staple from the second lowermost sheet-like staple and to take out the staple cartridge from the staple cartridge, a large feeding force must be applied. In some cases, the frictional resistance with the sheet staple was not sufficient.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a staple feeding device capable of solving the above-mentioned problems and providing a large feeding driving force to a lowermost sheet-like staple in a staple cartridge to always realize a reliable feeding. For that purpose.

[0005]

Means for Achieving the Object As a means for achieving the above object, a staple feeding device in an electric stapler according to the present invention comprises a plurality of sheet staples in which straight staples are connected in a sheet form; A magazine mounted with a staple cartridge with the lower ends of the front wall and the rear wall opened is provided on the base frame so as to be rotatable vertically, and when the magazine is rotated downward by an electric motor, the sheet-shaped staple is removed. In an electric stapler that forms and punches out a U-shape and spells the staple legs by penetrating the material to be sewn, it is slidable in the feed direction of the sheet-like staples from the open end of the lower end of the rear wall of the staple cartridge to the magazine. And the lowermost sheet-like stapler in the staple cartridge when sliding forward A feed member having an abutting portion that abuts a rear end surface of the magazine, and a support portion fixed at a rear position of the magazine. And an engagement portion that slides in the opposite direction to the opposite direction, and between the magazine and the feed member, the feed member is moved in the feed direction when the magazine is rotated upward and the engagement with the support portion is released. , A spring for sliding is provided.

[0006]

According to the above construction, when the magazine is rotated downward, the engaging portion of the feed member engages with the support portion of the magazine, and the feed member slides in a direction opposite to the feeding direction of the sheet staples. As a result, the contact portion also retreats with respect to the magazine.
On the other hand, when the magazine is rotated upward and disengaged from the support portion, the feed member slides in the feed direction of the sheet-like staples by the spring, so that the contact portion also moves relative to the magazine. The staple cartridge is moved forward, and the abutting portion abuts on the rear end surface of the lowermost sheet-like staple in the staple cartridge and pushes it forward as it is. The contact portion is advanced by a distance that enters the staple cartridge.

As described above, since the sheet staple is forcibly pushed out from the rear end by the spring force of the spring, the feeding force is much larger than the feeding force due to the frictional resistance between the lower surface of the sheet staple and the feeding means. . Therefore, even if the lowermost sheet staple and a part of the upper sheet staple are adhered or caught, a sufficient feed driving force can be applied. Further, once the lowermost sheet-like staple is separated from the second lowermost sheet-like staple, the staple can be supplied by a usual feeding device based on frictional resistance between the feeding means and the sheet-like staple.

[0008]

1 and 2 show an electric stapler. In this electric stapler, a magazine 2 on which a staple cartridge 1 containing sheet staples is mounted is provided on a base frame 3 so as to be rotatable in a vertical direction, and a pair of drive links 4 arranged on both sides of the magazine 2 is vertically moved. The magazine 2 is rotated by the drive link 4 operated by the electric motor 5 and is supplied to the front end of the magazine 2 when the magazine 2 is rotated downward by the electric motor 5. The sheet-shaped staple is formed into a U-shape, and the staple is punched out toward a spelling table at the front end of the base frame 3, and the staple legs are spelled by penetrating the material 7 on the spelling table 6.

The rear ends of the magazine 2 and the drive link 4 are rotatably supported by a support shaft 8 provided on a standing piece 3a at the center of the base frame 3 as shown in FIG. At the front end of the magazine 2, as shown in FIG. 5, a forming / ejecting portion 11 having a driver 9 and a forming plate 10 movably provided between a face plate 41 and a guide member 42 is provided. The front end of the link 4 is connected to the driver 9 via a connecting rod 43 (see FIG. 1). Further, the drive link 4 is driven up and down by a drive mechanism linked to the electric motor 5, and drives the magazine 2 together with the driver 9 so as to rotate vertically. In addition, Magazine 2
A curved arm 13 formed on the base frame 3 has a projection 12 formed on the base frame 3 at a position where the lower surface of the front end contacts the spelling table 6 of the base frame 3 and a projection 12 formed laterally from the lower end of the magazine 2 (FIG.
The rotation range of the magazine 2 is up to the position where the magazine 2 is engaged. The driver 9 is configured to move up and down relatively to the magazine 2, and the drive link 4 is set to be larger than the stroke of the magazine 2. Therefore, the driver 9 and the forming plate 10 are configured to move up and down relatively to the magazine 2.

As shown in FIGS. 1, 2 and 4, the drive mechanism of the drive link 4 uses the output of the electric motor 5 as the intermediate gear 14 as shown in FIG.
, The eccentric cam 17 fixed to the drive shaft 16 of the drive gear 15 and the cam roller 19 supported by the connection shaft 18 of the pair of drive links 4 are connected by a cam cover 20 and connected. The eccentric cam 17 is rotated by the drive shaft 16 to push the cam roller 19,
Is pulled by the cam cover 20 to rotate the drive link 4 in the vertical direction. In addition, the drive link 4 can be converted into a reciprocating rotary motion of the drive link 4 about the support shaft 8. What is necessary is just to employ | adopt what used the groove cam, for example.

A mounting portion 21 (see FIG. 4) for attaching and detaching the staple cartridge 1 is formed at the center of the magazine 2. As shown in FIG. 6, the staple cartridge 1 accommodates a plurality of sheet staples 22 in which straight staples are connected in a sheet shape, and the lower ends of the front and rear walls of the staple cartridge 1 are open. Further, at the lower ends of both side walls, protruding edges 23 are formed to support the lower surfaces of both side edges of the lowermost staple cartridge 1, except for this, and the bottom is formed open. A cap 24 (see FIG. 1) is attached to the upper portion of the staple cartridge 1, and the cap 24 and the uppermost sheet-like staple 22 are attached.
A spring (not shown) is disposed between the first and second staples, whereby the sheet staple 22 is urged downward.

Next, the lowermost sheet-like staple 22 in the staple cartridge 1 is fed forward by a feeder and led out from the front wall of the staple cartridge 1, and is then fed by a feed roller 25 (see FIG. 2). It is supplied further forward by the feeding means.

The feeding device pushes out the rear end of the lowermost sheet-like staple 22 when the magazine 2 rotates, and draws it out from the front wall 1a of the staple cartridge 1. The feeding device is located at the rear position of the magazine 2, that is, in FIG. 5 to 8, the spindle 8 of the magazine 2 at the center of the base frame 3.
And a feed member 28 slidably disposed in the magazine 2 in the front-rear direction.

As shown in FIG. 5, the feed member 28 has an inverted L-shaped piece 28b formed on the upper portion of a plate portion 28a, and an upper end of the inverted L-shaped piece 28b is engaged with the support portion 27 by being inserted into the support portion 27. An opening 30 is formed in the plate portion 28a, and an opening 30 is inserted into the lower portion of the support portion 27.
Also, on both side edges of the plate portion 28a, the protrusions 31 are vertically arranged,
A guide projection wall 33 formed in the feed direction of the sheet-like staple 22 is engaged with the inner surface of the side wall of the magazine 2 between the upper and lower projections 1 and 32, whereby the feed member 28 The staple cartridge 1 is slidably engaged along the feed direction of the magazine 2 from the lower end opening portion 34 of the rear wall 1b. Therefore, the feed member 28 always has the same inclination as the magazine 2, and the sheet-like staple 22
Is held so as to slide in the feed direction. Further, on the upper surface of the plate portion 28a, there is formed a contact portion 35 formed in a stepped wall shape by the thickness of one sheet staple 22. A tension spring 36 is attached between the projecting piece 37 of the magazine 2 and the projecting piece 38 of the feed member 28,
The feed member 28 is urged by a tension spring 36 to always move forward.

According to the feeding device, when the front end of the magazine 2 is at the upper position, the feeding member 28 is also inclined at the same angle as the inclination angle of the magazine 2 as shown in FIG. The spring 36 is in a state of being inserted most inside the staple cartridge 1. When the magazine 2 is driven by the drive mechanism of the drive link 4 to rotate downward from this state, the feed member 28 is also forcibly rotated as shown in FIG. 28
Since the upper end engaging portion 29 of b is engaged with the supporting portion 27, the feeding member 28 rotates around the engaging portion 39. Since the rotation center (support shaft 8) of the magazine 2 and the rotation center of the feed member 28 are different from each other, the plate portion 28a of the feed member 28 relatively retreats from the magazine 2 according to the rotation of the magazine 2. And the extension spring 36 is extended. Thereafter, when the front end of the magazine 2 rotates upward again, the feed member 28 by the support portion 27 is reversed.
Is disengaged from the engagement portion 29 of the inverted L-shaped piece 28b, so that the feed member 28 moves forward in the feed direction relative to the magazine 2 by the spring force of the tension spring 36, and in the middle thereof. The contact portion 35 of the plate portion 28a contacts the rear end surface of the lowermost sheet-like staple 22 in the staple cartridge 1 (see FIG. 3 (c)) and pushes the sheet-like staple 22 forward as it is. The staple 22 is guided out of the lower end opening of the front wall 1a of the staple cartridge 1 by the guide projection wall 33 on the inner surface of the side wall of the magazine 2 as shown in FIG. It is sent out for the distance to enter. Note that, at the time of feeding, the upper surface of the front portion 40 of the plate portion 28a before the contact portion 35 is
2 is supported to prevent the sheet-like staple 22 from bending.

The sheet-like staples 22 drawn out from the front wall 1a of the staple cartridge 1 are further supplied to the forming / ejecting portion 11 in front of the guide projection wall 33 by rotation of a feed roller 25 rotated by an appropriate driving mechanism. After that, the front end staple 22a is first formed into a U-shape by the forming plate 10 in the forming section as shown in FIG. 7 (a), and then guided and supplied to the punching section on the back face of the face plate.
The same figure by the driver 9 driven downward with 0
The sheet is punched out as shown in FIG.

According to the feeding device, the sheet-like staples 22 are forcibly pushed out from the rear end by the spring force of the tension spring 36, and the feeding force depends on the frictional resistance between the lower surface of the sheet-like staples 22 and the feeding means. Much greater than the feed force. Therefore, the lowermost sheet staple 22 and the upper sheet staple 22
Sufficient feed driving force can be applied even if a part of the sheet is adhered or caught. Further, once the lowermost sheet-like staple 22 is separated from the second lowermost sheet-like staple 22, the remaining sheet-like staples 22 are supplied by a normal feeding device based on frictional resistance between the feeding means and the sheet-like staples 22. Can be.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an electric stapler according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the electric stapler.

FIGS. 3 (a), (b), (c) and (d) are explanatory views of an operation mode of the delivery device according to the present invention.

FIG. 4 is an exploded perspective view of a magazine, drive links, and a base frame.

FIG. 5 is an exploded perspective view of the magazine.

FIG. 6 is a perspective view of a main part of the staple cartridge.

FIGS. 7 (a) and 7 (b) are explanatory views of a staple forming and punching mode in a magazine forming and punching section, respectively.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 staple cartridge 2 magazine 3 base frame 5 electric motor 7 sewn material 22 sheet staple 27 support portion 28 feed member 29 engagement portion 35 contact portion 36 tension spring

Claims (1)

(57) [Claims] 1. A magazine in which a plurality of staples in which straight staples are connected in a sheet shape and a staple cartridge having a lower end of a front wall and a lower end of a rear wall is mounted is rotated vertically on a base frame. An electric stapler, which is freely provided and forms and punches out the sheet-like staples in a U-shape when the magazine is rotated downward by an electric motor, and spells the staple legs by penetrating the material to be sewn. On the other hand, the staple cartridge is slidably disposed in the feed direction of the sheet staple from an open portion at the lower end of the rear wall thereof and abuts against the rear end surface of the lowermost sheet staple in the staple cartridge when sliding forward. A feed member having an abutment portion, and a support portion fixed at a rear position of the magazine, wherein the feed member includes a magazine. At the time of downward rotation, an engagement portion is formed which engages with the support portion and slides in a direction opposite to the feed direction, and between the magazine and the feed member, the magazine rotates upward and the support portion and A staple feeding device for an electric stapler, wherein a spring for sliding the feeding member in the feeding direction when the engagement of the staple is released is arranged.