JPH0871951A - Taking out mechanism for staple cartridge in electric stapler - Google Patents

Abstract

PURPOSE: To make the taking out of a cartridge impossible until a staple sheet is used up by such a method as the engaging part of an accommodating section engages in the engaging hole of the side part of the accommodated cartridge from an outside, and a lock link supports the side part of the cartridge from an inside, and the rotation of the lock link is checked through a pressing body. CONSTITUTION: When a cartridge 6 is attached on the accommodating section 4 of a magazine unit 3, the engaging part of an engaging piece 19 engages in the engaging hole 16 of the rear side piece 6b of the cartridge 6 from an outside. In this case, the rear end face of the projection 26 of a lock link 24 abuts on the front of the rear side piece 6b of the cartridge 6, and supports the rear side piece 6b from an inside. Thus, an engagement is not released so long as the lock link 24 does not rotate. On the other hand, a pressing body 21 is pushed up by a staple sheet(sheet) 5 to make a rear wall face 21a abut against the projection 26 of the lock link 24 for checking the rotation of the lock link 24. The rotation of the lock link 24 is therefore checked until the sheet 5 is used up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a take-out mechanism for taking out a staple cartridge which is attached to and detached from an accommodating portion of an electric stapler from the accommodating portion.

[0002]

2. Description of the Related Art As an electric stapler of this type, there is a type in which staple cartridges containing staple sheets in multiple stages are attached to and detached from an electric stapler accommodating portion. When the inside of this cartridge becomes empty, it must be replaced with a new one. Conventionally, as shown in Japanese Utility Model Publication No. 6-5095, the staple cartridge is taken out by the operation of picking up the rear end. It was

However, according to this method, even if the staple sheet remains in the cartridge, the cartridge can be picked up and removed. In this case, since the guide portion for guiding the staple sheet to the side of the staple driving passage is provided at the tip of the cartridge, the cartridge is removed by pulling up the rear end of the cartridge. Therefore, a force for bending the staple sheet acts on the staple sheet located in the staple feeding passage of the cartridge mounting portion, and the staple sheet is separated from the middle. A part of the remaining staple sheet jumps out into the cartridge mounting portion, which may hinder the mounting of a new cartridge.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a cartridge removing mechanism capable of removing the cartridge only when the staple sheet is completely exhausted in the cartridge.

[0005]

In order to achieve the above object, a staple cartridge take-out mechanism in an electric stapler according to the present invention connects straight staples in a sheet shape to a magazine unit attached to a head portion. A cartridge containing multiple staple sheets is detachably attached from the bottom of the stapler storage section, and when the magazine unit is attached to the head section, the staple sheets are sequentially sent out from the cartridge to predetermined positions to form a U-shape. In an electric stapler to be driven out, an engaging hole is formed on one side of the cartridge,
The accommodating portion is formed with an engaging portion that engages with the engaging hole of the cartridge in the accommodating state from the outside, and the inside of the accommodating portion is constantly urged downward to press the staple sheet in the cartridge downward. A lock body that fits and attaches a pressing body, and a lock link that supports the side portion of the cartridge from the inside and holds the engagement is rotatably attached to the upper portion of the accommodating portion. When the staple sheet remains at the position where the staple sheet remains, the lock link supporting the side portion of the cartridge is abutted so as to be non-rotatable, and when the staple link is not present in the cartridge, the lock link is moved. It is characterized in that it is arranged so as to release the contact with.

[0006]

According to the above construction, when the cartridge is accommodated in the accommodating portion, the engaging portion of the accommodating portion engages with the engaging hole of the side portion of the cartridge from the outside. At this time, since the lock link supports the side portion from the inside, the engagement is not released unless the lock link rotates. However, since the pressing body that presses the staple sheet downward comes into contact with the lock link, the rotation of the lock link is blocked, the engagement is maintained as it is, and the cartridge is housed and held in the housing portion.

Thereafter, the staples in the cartridge are sequentially consumed with the stapling operation of the electric stapler, and the pressing body also moves downward accordingly. When the last staple sheet in the cartridge is sent out from the cartridge, the pressing body moves to the lowermost position. At this position, the contact of the pressing body with the lock link is released, so that the lock link rotates. In this state, the engagement portion of the magazine unit is disengaged from the engagement hole of the cartridge, and the cartridge can be taken out of the accommodation portion and replaced with a new cartridge.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the essential parts of an electric stapler. In this electric stapler, a head unit 1 and a binding table 2 are installed so as to correspond to the upper and lower sides, a magazine unit 3 (see FIG. 3) mounted on the head unit 1 is mounted, and a storage unit 4 of the magazine unit 3 is mounted. The staple sheets 5 accommodated in multiple stages are fed to the feed roller 8 by the vertical movement of the head portion 1 by the motor 7.
By rotating the sheet through a rack (not shown) in order from the opening at the lower end of the front wall of the accommodating portion 4 to the staple sheet 5 in order.
The driving plate 10 driven by the motor 7 at its front end portion to drive the forming plate 11 and the driver plate 12, and the staples at the front end of the feeding passage 9 are formed into a U shape by the forming plate 11. Further, the formed staple 3a is punched out by the driver plate 12, the paper 13 on the binding table 2 is penetrated, and the paper 13 is bent by the clincher groove 14 to be bound.

The operation mechanism of the feed roller 8, the forming plate 11, and the driver plate 12 is Jpn. 1-134210, Jpn. 3-541061, and Jpn.
No. 46634 and Japanese Patent Application No. 6-102261 are the same as those shown in FIG.

The staple sheet 5 is formed by connecting straight staples into a sheet shape, and is contained in a staple cartridge (hereinafter simply referred to as a cartridge) 6 shown in FIGS. 2 (a) and 2 (b).

The cartridge 6 is made of paper and accommodates the block 15 of the staple sheet 5 which is formed by stacking the staple sheets 5 in multiple layers. The side pieces 6a supporting both sides of the block 15 and the rear portion of the staple sheet 5 are provided. A pair of rear side pieces 6b supporting both sides and a bottom piece 6c supporting the bottom part thereof.
It is composed of and, and the upper part and the front part are open. An engagement hole 16 is formed in the upper portion of the rear side piece 6b. The rear piece 6b is also made of paper and can be bent.
The center of the block 15 is bound by a binding tape 17.

The cartridge 6 is attached to and detached from the accommodating portion 4 of the head portion 1. The accommodating portion 4 is formed in the magazine unit 3 which is detachably attached to the head portion main body 1a.

As shown in FIG. 3, the magazine unit 3 includes not only the accommodating portion 4 of the cartridge 6 and the feed passage 9 of the staple sheet 5, but also a part of the staple forming mechanism by the forming plate 11 and the ejection mechanism by the driver plate 12. Is configured as a unit and is configured to be attachable / detachable to / from the head portion 1 and detachably provided to the head portion main body 1a.

Further, the accommodating portion 4 of the magazine unit 3 is formed in a size capable of accommodating the cartridge 6, and the bottom portion thereof is open so that the cartridge 6 can be inserted and removed.
Further, as shown in FIG. 3, the rear wall 4a of the housing portion 4 is
Is partially cut out, and a pair of engagement pieces 1 is formed in the cutout portion 18.
9 is formed upright, and the upper end of the engagement piece 19 engages with the engagement hole 16 of the cartridge 6 in the housed state from the outside.
0 is formed.

Further, the pressing body 2 is provided inside the accommodating portion 4.
1 is fitted and mounted so as to be slidable in the vertical direction. The pressing body 21 has a weight function, is formed in a box shape, and a coil spring 22 is disposed between the pressing body 21 and the upper wall of the housing portion 4, and the pressing body 21 is constantly moved downward by the coil spring 22. It is biased and placed on the uppermost staple sheet 5 in the cartridge 6 as shown in FIG. 5, which will be described later, and presses the staple sheet 5 downward. Rear wall portion 21a of the pressing body 21
An L-shaped piece 23 is formed so as to project from the upper part of the.

Further, a lock link 24 capable of supporting the rear side piece 6b of the cartridge 6 from the inside is rotatably attached to the rear upper portion of the side wall 4b of the accommodating portion 4. The lock link 24 includes a central piece 24a and both side pieces 24b.
In addition to forming U and U in the shape of U, the shaft portion 25 is formed outside both side pieces 24b, a hanging piece 24c is formed below the center of the central piece 24a, and a convex portion 2 is formed on both sides of the base of the hanging piece 24c.
6 is formed so as to project inward. The shaft portion 25 is rotatably supported by the side wall 4b of the housing portion 4.

The hanging piece 24c of the lock link 24 is arranged so as to be substantially flush with the rear wall 4a of the housing portion 4, and the convex portion 26 is arranged so as to be in sliding contact with the rear wall portion 21a of the pressing body 21. (See FIG. 5). When the pressing body 21 moves downward, instead of the convex portion 26, the tip of the L-shaped piece 23 of the pressing body 21 abuts the hanging piece 24c of the lock link 24 to prevent its rotation (FIG. However, when the cartridge 6 is moved to a position where the staple sheet 5 is not present, the contact with the hanging piece 24c is released (see FIG. 7). The front end of the side piece 24b contacts the spring piece 27 formed on the upper wall of the housing portion 4, and the hanging piece 24c of the lock link 24 is biased so as to be substantially flush with the rear wall of the housing portion 4. ing.

With the above construction, when mounting the cartridge 6 in the accommodating portion 4 of the magazine unit 3, as shown in FIG.
As shown in FIG. 5, the binding tape 17 is removed by inserting it from the bottom opening portion of the housing portion 4 to a predetermined position. When the cartridge 6 is inserted to a predetermined position, the engaging portion 20 on the upper end of the engaging piece 19 is engaged with the engaging hole 1 of the rear side piece 6b of the cartridge 6.
Engage 6 from the outside. At this time, as shown in FIG. 5, the rear end surface of the convex portion 26 of the lock link 24 contacts the front surface of the rear side piece 6b of the cartridge 6 and supports the rear side piece 6b from the inside, so that the lock link 24 does not rotate. As long as the above engagement is not released. However, since the pressing body 21 comes into contact with the upper part of the uppermost staple sheet 5 and the wall surface 21a then comes into contact with the convex portion 26 of the lock link 24, the rotation of the lock link 24 is prevented, and the above engagement remains the same. Retained,
The cartridge 6 is housed and held in the housing portion 4. In this state, the magazine unit 3 may be attached to the head unit 1.

After that, as the stapler in the cartridge 6 is consumed in sequence as the electric stapler is bound, the rear wall of the pressing body 21 moves downward while sliding against the convex portion 26 of the lock link 24. When moving downward beyond the portion 26, as shown in FIG. 6, the tip of the L-shaped piece 23 of the pressing body 21 abuts on the hanging piece 24c of the lock link 24 to prevent its rotation, so that it continues. The rotation of the lock link 24 is blocked.

When the last staple sheet 5 in the cartridge 6 is sent out from the cartridge 6,
As shown in FIG. 7, the pressing body 21 moves to the lowermost position. At this position, the tip of the L-shaped piece 23 of the pressing body 21 is disengaged from the hanging piece 24c of the lock link 24 (the contact is released), so that the lock link 24 is pulled out of the cartridge 6 and moved clockwise in the drawing. The cartridge 6 can be taken out from the bottom opening portion of the accommodating portion 4 by being rotated to and released from the engagement with the engaging portion 20, and can be replaced with a new cartridge 6.

[0021]

According to the present invention, when the staple sheet remains in the cartridge, the cartridge cannot be taken out from the accommodating portion of the magazine unit. The cartridge can be taken out of the accommodating section only when the staple sheet is removed from the inside of the cartridge.
Since the cartridge cannot be taken out until the last one of the staple sheets is used up, the staple sheet is not wasted. Further, when the cartridge is taken out, the last staple sheet is not cut or remains in the accommodating portion, so that the cartridge can be replaced smoothly.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an electric stapler according to the present invention.

2 (a) and (b) are perspective views of the cartridge viewed from different angles.

FIG. 3 is an exploded perspective view of a magazine unit

FIG. 4 is a cross-sectional view of a state before mounting the cartridge in the accommodating portion.

FIG. 5 is a cross-sectional view of a state in which the cartridge is mounted in the storage unit.

FIG. 6 is a cross-sectional view of a state in which a final staple sheet remains in a storage unit.

FIG. 7 is a cross-sectional view showing a state where the cartridge is taken out from the accommodation portion.

[Explanation of symbols]

 5 Staple Sheet 6 Staple Cartridge 16 Engagement Hole 4 Storage Part 20 Engagement Part 21 Pressing Body 24 Lock Link

Claims (1)

[Claims] 1. A stapler sheet is removably attached to a magazine unit mounted on a head portion, the cartridge containing a plurality of stages of staple sheets in which straight staples are connected in a sheet shape is detachably attached from the bottom portion of the stapler storage portion. In the electric stapler, which is sequentially sent out from the cartridge to a predetermined position, formed into a U-shape, and is punched out, an engaging hole is formed in one side portion of the cartridge, and the accommodating portion has an engaging hole outside the engaging hole of the cartridge. And an engaging portion that is engaged with the pressing portion that presses the staple sheet in the cartridge downward by being constantly urged downward in the accommodating portion. Is rotatably attached with a lock link that supports the side portion of the cartridge from the inside and holds the engagement, When the staple sheet remains in the cartridge, the lock link supporting the side portion of the cartridge abuts so as to be non-rotatable, and when it moves to a position where there is no staple sheet in the cartridge, A mechanism for taking out a staple cartridge in an electric stapler, which is arranged so as to release the contact with the lock link.