JPH11170212A - Sheet binding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the sure conveyance of a staple plate, which is necessary to be intermittently conveyed little by little. SOLUTION: In a sheet binding device having a cartridge for housing a staple plate, which is formed by continuously connecting a plurality of staples made of magnetic substance, a conveying means 14 for conveying the staple plate, a driver part for striking out a conveyed staple plate one staple by one staple and an anvil part, which bends the staple in combination with the driver part, conveying means 14 has a magnetic force generator for magnetizing the staple plate for conveyance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet binding apparatus for binding a sheet bundle, and more particularly to a sheet binding apparatus capable of stably transporting a staple plate used for staple binding.

[0002]

2. Description of the Related Art Conventionally, there is a sheet binding apparatus (hereinafter referred to as a stapler) as an apparatus for binding a sheet bundle. As a stapler, a simple small stapler that manually performs staple binding of a sheet bundle and an electric stapler are known. In particular, an image forming apparatus such as a copying machine is provided with a sheet processing apparatus (sort, finisher, etc.) for performing processing such as sorting and alignment of discharged sheets, and this is sometimes provided with an electric stapler. is there.

A conventional electric stapler is shown in FIGS.
Explanation will be made using 0. The stapler 50 shown in FIG. 9 includes a drive motor 52 attached to a frame 51 and an anvil 53 having an anvil portion, and a swing portion 54 that swings by the driving force of the drive motor 52. The swing unit 54 includes a cartridge 55 for accommodating the needles, a magazine unit 56 for sending out the needles, and a driver unit 57 for ejecting the sent out needles one by one.

[0004] A plurality of staple plates formed by connecting staples are loaded in the cartridge 55 of the swinging portion 54, and a position for contacting the lower surface of the cartridge 55 in the magazine portion 56 is provided for transporting the staple plate. A roller 61 is provided. The roller 61 is provided with a driving force transmitting means (not shown) for transmitting the driving force of the driving motor 52, and conveys the needle plate at a desired driving speed and driving timing.

The swing portion 54 is supported at a substantially central portion of a swing lever 58. One end of the swing lever 58 is linked to the eccentric cam 60, and the other end is attached to a driver portion 57. That is, when the eccentric cam 60 is rotated by the drive motor 52 via the gear train 59, the swing lever 58 swings, so that the entire swing portion 54 swings and the driving force is transmitted to the driver portion 57. The driver unit 57 deforms and punches the needle at the tip of the conveyed needle plate, and can bind the sheet bundle in cooperation with the anvil unit of the anvil 53.

[0006]

As described above, in the conventional sheet binding apparatus, the staple plate is transported by friction of the roller. However, since the needle plate moves only one stitch after driving one stitch, the amount of rotation of the roller relative to the needle plate increases, and the change in the coefficient of friction due to the abrasion of the roller surface increases the transportability. Becomes unstable.

If the amount of rotation of the roller is reduced to solve this problem, the number of binding operations (the number of idle shots) from the initial cartridge loading until the first binding operation is performed increases.

It is also conceivable to use intermittent drive so as to reduce the number of rotations of the roller as much as possible. However, the mechanism of the drive transmission unit becomes complicated, which increases the production cost and lowers the reliability of the apparatus. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet binding apparatus capable of reliably transporting a staple plate which needs to be transported intermittently little by little.

[0010]

In order to solve the above-mentioned problems, a sheet binding apparatus according to the present invention comprises a cartridge for accommodating a staple plate in which a plurality of needles made of a magnetic material are continuously connected; A sheet binding device comprising: a conveying unit for conveying a staple plate; a driver unit for punching the conveyed staple sheet for each staple; and an anvil unit for bending the staple in cooperation with the driver unit. The transporting means has a magnetic force generator, and is configured to transport by magnetizing a needle plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of a sheet binding apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a sheet binding apparatus according to the present embodiment,
FIG. 2 is a cross-sectional view of the sheet binding apparatus, FIG. 3 is a perspective view illustrating a swing unit, FIG. 4 is a side view illustrating the operation of the swing unit, and FIG.
FIG. 6 is a plan view illustrating a needle plate transport unit, FIG. 6 is a side view illustrating a needle plate transport unit, FIG. 7 is a diagram illustrating a driver unit and an anvil unit, and FIG.
(B) is a side view.

A main body 1 of a sheet binding apparatus (hereinafter referred to as a stapler) shown in FIG. 1 includes a drive motor 3 and an anvil 4 attached to a pair of opposed frames 2, and a swing portion 11 which swings by a driving force of the drive motor 3. It is composed of

As shown in FIGS. 2 and 3, a swing shaft 7 to which an eccentric cam 8 is fixed is attached to the frame 2, and a driving force is transmitted through a gear train 6. A support shaft 9 is supported by the stapler main body 1 by support means (not shown), and a pair of swing levers 10 are rotatably supported on the support shaft 9.

A roller 10 a is provided at one end of the swing lever 10 and is engaged with the eccentric cam 8. Therefore, FIG.
As shown in FIG. 2B, the rotation of the eccentric cam 8 moves the roller 10a so as to be separated from and brought into contact with the swing shaft 7, and accordingly, the swing lever 10 and the swing unit 11 swing. It will be. Further, a forming portion 16 and a driver portion 17, which will be described later, are attached to the tip of the swing lever 10.

A magazine 12 is mounted on the swinging part 11, and a cartridge 13 is provided continuously with the magazine 12. In the cartridge 13, a plurality of staple plates P formed by connecting a plurality of staples can be loaded. The binding needle is formed of a ferromagnetic material such as iron.

As shown in FIGS. 5 and 6, a transport means 14 for transporting the needle plate P is provided below the swinging portion 11 and at a position between the magazine 7 and the cartridge 13. The conveying means 14 includes a conveying belt 14c and a pair of driving rollers 14a and 14b for stretching the conveying belt 14c. The transport belt 14c is a permanent magnet belt generated by a bond magnet or the like, and can magnetize the needle plate P.

The drive rollers 14a and 14b are rotationally driven by drive transmission means (not shown) to drive the transport belt 14c. Then, since the needle plate P is a magnetic material, the needle plate P is magnetized on the transport belt, and thus can be transported. Scrapers 15 are arranged on both sides of the downstream drive roller 14b, and have a function of separating the needle plate P magnetized on the transport belt 14c.

Therefore, the lowermost needle plate P loaded in the cartridge 13 is first magnetized on the transport belt 14c, and is transported as the transport belt 14c rotates. The needle plate P is transported by the scraper 15 to the transport belt 14.
c, the tip of which is continuously urged to the driver section 17 described below.

Downstream of the swinging part 11 in the transport direction of the needle plate P, a forming part 16 for separating the sent needle plates one by one and deforming the needle plate into a U-shape and an anvil 4 facing the same. And a driver unit 17 that operates to perform the binding operation of the sheet bundle.

The driver section 17 comprises a face plate 17a for regulating the leading end of the staple sheet P and a driver 17b for driving one binding staple downward. 5 are arranged. The clincher 5 is configured to be rotatable by transmitting the driving force of the driving motor 3 by driving transmission means (not shown).

When a sheet bundle is bound by using the sheet binding apparatus constructed as described above, a binding operation command is first issued from a control unit (not shown), the drive motor 3 is driven, and the eccentric cam 8 is rotated. The swing lever 10 swings. Accordingly, the swing unit 11 swings to bind the sheet bundle insertion frontage, and at the same time, the forming unit 16 and the driver unit 17 move with respect to the magazine.

At this time, the needle plate P is conveyed in the direction of the forming portion 16 by the conveying means 14 from the upstream side, and is urged by the face plate 17a when it reaches. Here, the binding staples at the tip of the staple plate P are separated by the forming unit 16 and simultaneously formed into a U-shape. Next, the binding staple at the leading end is separated from the staple plate P by the driver 17b, further penetrates the sheet bundle, and the leading end is bent by the clincher. Thereby, the sheet bundle is bound by the binding needles.

After the driving is completed, the driver unit 17 moves to the standby position together with the swing lever 10 and the magazine 12. At this time, the conveying means 14 keeps urging the needle plate P against the driver section 17,
When the tip of the driver 17b passes through the position of the needle sheet P,
The sheet is conveyed to a position where it comes into contact with the face plate 17a to prepare for the next binding operation. By repeating this, the binding operation is continuously repeated.

Here, the transporting means 14 is continuously rotating and idles except during transporting. However, since the needle plate is attracted by the magnetic force, a transporting force greater than the frictional force is obtained. be able to. Therefore, the staple sheet P can be reliably sent out, and the reliability of the binding operation can be improved.

As described above, by transporting the needle plate P by attracting the needle plate P to the transport means 14 by magnetic force,
The needle plate P can be transported reliably without a change with time due to idling. Accordingly, the stapling plate P can be stably conveyed even in a binding operation in which idling frequently occurs, and a reliable binding operation in which idle punching is less likely to be performed.

[Second Embodiment] Next, a second embodiment of the sheet binding apparatus according to the present invention will be described. The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment, the transfer belt 14c of the transfer means 14 has been described as having magnetism by a permanent magnet. In this embodiment, the drive rollers 14a and 14b are formed by electromagnet rollers having coils inside. Make up.

Both ends of each of the drive rollers 14a and 14b are connected to a control circuit (not shown) so that each of the rollers 14a and 14b can be arbitrarily formed into an electromagnet. The transport belt 14c is a magnetic belt containing a ferromagnetic substance,
When the roller pairs 14a and 14b are electromagnetized, the transport belt 14c is also magnetized so that the needle plate P can be magnetized.

With the above configuration, the amount of movement of the needle plate P can be controlled by the timing at which the roller pairs 14a and 14b are turned into electromagnets. Therefore, for example, when it is desired to move the needle plate P a lot immediately after the cartridge is set, it is possible to carry a distance corresponding to the rotation amount of the roller pair 14a, 14b by continuously energizing. Also, if you want to transport only one stitch, shorten the energizing time,
It is possible to minimize the slip amount between the transport belt 14c and the needle plate P.

Further, even when the power is supplied continuously, stable conveyance with no change over time can be performed as in the first embodiment.

Third Embodiment Next, a third embodiment of the sheet binding apparatus according to the present invention will be described. The same parts as those in the first or second embodiment will be denoted by the same reference numerals, and description thereof will be omitted. FIGS. 8A and 8B are views for explaining a staple plate conveying means of the sheet binding apparatus according to the present embodiment, wherein FIG. 8A is a side view and FIG. 8B is a perspective view of a conveying roller.

In the above embodiments, the needle plate P is magnetized and conveyed by the belt-shaped rotating body. However, the same effect can be obtained by directly magnetizing the needle plate using the cylindrical magnetic roller. Can be obtained.

As shown in FIG. 8A, in the carrying means according to the present embodiment, a cylindrical magnet roller 18 is arranged at a position where it contacts the lower surface of the cartridge 13 of the magazine 12. As shown in FIG. 8B, the magnet roller 18 is configured by arranging a plurality of permanent magnets 18a, and is configured to magnetize the needle plate and convey it.

With such a configuration, the needle plate P can be transported reliably without a change with time due to idling, and even when frequent idling occurs, a reliable binding operation in which idling is not likely to occur can be performed. it can. Also the magnet roller 18
Is composed of electromagnets.
And the amount of slip of the needle plate P can be reduced as much as possible.

In the third embodiment, the magnet roller 18 is configured using permanent magnets. However, the magnet roller may be configured to have magnetism by an electromagnet, and control means for controlling energization may be provided. . As a result, the same effect as in the third embodiment can be obtained. Further, by controlling the energizing time to the electromagnet, the magnet roller 18 and the needle plate P can be controlled.
Can be reduced as much as possible.

[0036]

As described above, by providing the magnetic force generator in the means for transporting the needle plate, the needle plate can be transported by the magnetic force. Therefore, the staple plate can be transported reliably without causing a change with time due to idling, and even when frequent idling occurs, it is possible to perform a reliable binding operation in which idling is not likely to occur.

Further, by configuring the transfer means with an electromagnet, it is possible to control the amount of movement of the needle plate by the timing at which the transfer means is changed to an electromagnet. This makes it possible to minimize the amount of slip between the transport means and the needle plate.

[Brief description of the drawings]

FIG. 1 is a plan view of a sheet binding device according to a first embodiment.

FIG. 2 is a sectional view of the sheet binding apparatus.

FIG. 3 is a perspective view illustrating a swing unit.

FIG. 4 is a side view illustrating the operation of the swing unit.

FIG. 5 is a plan view illustrating a transport means of a needle plate.

FIG. 6 is a side view illustrating a needle plate transport unit.

7A and 7B are diagrams illustrating a driver unit and an anvil unit, wherein FIG. 7A is a front view and FIG. 7B is a side view.

FIGS. 8A and 8B are diagrams illustrating a staple plate conveying unit of the sheet binding apparatus according to the third embodiment, wherein FIG.
FIG. 3B is a perspective view of a transport roller.

FIG. 9 is a plan view of a sheet binding apparatus according to a conventional example.

FIG. 10 is a sectional view of a sheet binding apparatus according to a conventional example.

[Explanation of symbols]

 P ... needle plate 1 ... body 2 ... frame 3 ... drive motor 4 ... anvil 5 ... clincher 6 ... gear train 7 ... swing shaft 8 ... eccentric cam 9 ... support shaft 10 ... swing lever 10a ... roller 11 ... swing portion 12 magazine 13 cartridge 14 conveying means 14a driving roller 14b driving roller 14c conveying belt 15 scraper 16 forming part 17 driver part 17a face plate 17b driver 18 magnet roller

Claims (7)

[Claims] 1. A cartridge for accommodating a needle plate in which a plurality of needles made of a magnetic material are continuously connected, a conveying means for conveying the needle plate, and a stitched needle sheet for each stitch A sheet binding device having a driver section for driving the sheet and an anvil section for bending the needle in cooperation with the driver section, wherein the conveying means has a magnetic force generator and is conveyed by magnetizing a needle plate. A sheet binding device characterized in that it is configured to perform 2. The sheet binding apparatus according to claim 1, wherein said conveying means is configured to have magnetism by a permanent magnet. 3. The method according to claim 1, wherein the conveying unit includes a pair of driving rollers,
A transport belt having magnetism and being stretched over the drive roller,
3. The sheet binding apparatus according to claim 2, further comprising a driving source for driving the pair of driving rollers. 4. The sheet binding apparatus according to claim 1, wherein said conveying means is configured to have magnetism by an electromagnet. 5. The transporting means includes: a pair of drive rollers at least one of which is formed by an electromagnet; a transport belt formed of a magnetic material and stretched over the pair of drive rollers; 5. The sheet binding apparatus according to claim 4, further comprising: a driving source to be driven; and a control circuit for controlling the energization of a driving roller including the electromagnet. 6. The sheet binding apparatus according to claim 1, wherein said conveying means comprises a cylindrical magnet roller and a drive source for driving said magnet roller. 7. The apparatus according to claim 1, wherein the transfer unit includes a cylindrical electromagnet roller, a driving source for driving the electromagnet roller, and a control circuit for controlling the energization of the electromagnet roller. The sheet binding device according to claim 6.