JP2001240302A - Sheet filing device and image-forming device provided with this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a floating up of a sheet bundle without imparting a damage to an approaching/leaving of a staple hitting-in means and a staple receiving means. SOLUTION: This sheet filing device 30 is provided with a staple hitting-in means 31 for hitting-in a staple on a sheet bundle approachably/leavably disposed in opposed to both sides of a conveying area of the sheet bundle and conveyed on the conveying area; and a staple receiving means 32 for receiving and bending the staple hit-in on the sheet bundle movably in a direction crossing to a conveying direction of the sheet bundle corresponding to a staple hitting-in position. The sheet filing device 30 is further provided with a floating-up prevention guide member 46a for preventing a floating-up of the sheet bundle conveyed on the conveying area and guiding the sheet bundle at least one side of at least one means of the staple hitting-in means and the staple receiving means movably corresponding to a movement of the means.

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 an image forming apparatus such as a copying machine, a printer, a facsimile, and a multifunction machine including the sheet binding apparatus.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional sheet binding apparatus includes a driving head unit (staple driving means) 31 for driving staples into a sheet bundle, and a sheet moving direction in the thickness direction of the sheet bundle with an anvil drive shaft 37 as a center. An anvil unit (staple receiving means) 32 (not shown) approaches and separates (tilts in the direction of the arrow) from the bundle and receives and bends staples driven into the sheet bundle by the anvil unit. 25 are provided facing up and down. The driving of the driving head unit 31 by the rotation of the screw shaft 35 and the rotation of the anvil unit 32 by the rotation of the screw shaft 36 move in the direction intersecting with the sheet bundle conveying direction (the direction of the front and back of the sheet of FIG. 7), and The position can be stapled.

A mylar 100 is interposed between the driving head unit 31 and the anvil unit 32. When binding the sheet bundle, the mylar 100 can be used even if the sheet is warped or raised.
The sheet bundle is provided so that the sheets do not float so that staples can be driven into predetermined positions. The mylar 100 is located above the sheet conveyance path 25 and within the range of movement of the driving head unit 31 and the anvil unit 32, and both ends in a direction intersecting with the sheet bundle conveyance direction are provided on the fixing member. I have. Further, the mylar 100 can be elastically deformed so as not to hinder the stapling operation even if it is sandwiched between the driving head unit 31 and the anvil unit 32 during stapling.

[0004]

However, Mylar 10
As shown in FIG. 8, when the jammed sheet is jammed in the X direction as shown in FIG. 8, the sheet may be deformed, and it may not be possible to reliably prevent the sheets of the sheet bundle from rising. For this reason, in the conventional sheet binding apparatus, a conveyance failure of the sheet bundle P, a binding misalignment, and the like may occur.

As a method for addressing such a problem,
It is conceivable to use a rigid plate made of a metal plate in place of the mylar that elastically deforms. However, the use of a rigid plate will hinder the movement of the anvil unit 32 during stapling.

(Purpose) The present invention relates to a sheet binding apparatus provided with a guide member capable of preventing a sheet bundle from being lifted without hindering the approach and separation between a staple driving means and a staple receiving means, and a sheet binding apparatus having the same. It is an object to provide an image forming apparatus provided with the apparatus.

[0007]

In order to achieve the above object, a sheet binding apparatus according to the present invention is arranged such that a sheet bundle is conveyed in said conveying area, which is disposed on both sides of a sheet bundle conveying area so as to be able to approach and separate from each other. Staple driving means for driving staples into the incoming sheet bundle, and staple receiving means for receiving and folding the staples driven into the sheet bundle can be moved in a direction intersecting the sheet bundle conveying direction according to the staple driving position. In addition, a lifting prevention guide member for preventing the lifting of the sheet bundle conveyed in the conveying area and guiding the sheet bundle, at least one of the staple driving means and the staple receiving means One side is provided so as to be movable in accordance with the movement of the means.

The lifting prevention guide member is interposed between the staple driving means or the staple receiving means and the fixing member opposed to the lifting prevention guide member and is urged by elastic members from both sides.

[0009] A plurality of the lifting prevention guide members are provided.

The lifting prevention guide member is a film-like member stretched between the staple driving means or the staple receiving means and the fixing member facing the lifting prevention guide member.

In order to achieve the above object, an image forming apparatus according to the present invention includes an image forming unit for forming an image on a sheet, and a sheet bundle on which an image is formed by the image forming unit. And a sheet binding device.

(Operation) The sheet binding device guides the sheet bundle conveyed in the conveyance area between the staple driving means and the staple receiving means by the lifting prevention guide member. Then, bind with staples. To change the staple driving position, the staple driving device and the staple receiving device are moved in a direction intersecting the sheet bundle conveying direction. At this time, the lifting prevention guide member is also moved by the staple driving means or the staple receiving means located on the side.

When the lifting prevention guide member is urged by the elastic members from both sides with the lifting prevention guide member interposed between the opposed staple driving means or the staple receiving means and the fixing member, the staple driving means and the staple are provided. When the receiving means moves to the binding position, the elastic member expands and contracts and moves. With the expansion and contraction of the elastic member, the floating prevention guide member also moves, and the floating prevention guide member is provided with staple driving means or staple receiving means. Therefore, it is always at the approximate center of the fixing member.

[0014] When the lifting prevention guide member is a film-like member stretched between the staple driving means or the staple receiving means and the fixing member facing the lifting prevention guide member, the film-like member is: As the staple driving device and the staple receiving device move to the binding position, they are sent out or taken up, and always face the sheet bundle.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(Main Body of Copier) A main body of a copier, which is an example of an image forming apparatus provided with a sheet post-processing device having a staple unit (sheet binding device) according to the present invention,
Explanation will be given based on FIG.

The main body 1 of the copying machine 20 includes a platen glass 906 as a document table, a light source 907, and a lens system 90.
8, a paper feeding unit 909, an image forming unit 902, and the like. An original D is placed on a platen glass 906
An automatic document feeder 940 for automatically feeding the original is provided.

The paper feeding section 909 has cassettes 910 and 911 which accommodate recording sheets S and are detachable from the main body 1, and a deck 913 which is arranged in a peddy style 912. An image forming unit (image forming unit) 902 includes a cylindrical photosensitive drum 914 and a developing device 9 disposed around the photosensitive drum 914.
15, a transfer charger 916, a separation charger 917, a cleaner 918, a primary charger 919, and the like. On the downstream side of the image forming unit 902, a conveying device 920, a fixing device 90
4, a pair of paper discharge rollers 1a, 1b, etc. are provided.

The operation of each mechanism in the main body 1 of the copying machine 20 will be described.

When a sheet feed signal is output from a control device 921 provided in the main body 1, sheets S are fed from the cassettes 910, 911 or the deck 913. On the other hand, the light source 9 is attached to the original D placed on the platen glass 906.
Light reflected from 07 is reflected on the photosensitive drum 914 via the lens system 908. Photosensitive drum 914
Are charged in advance by a primary charger 919, and an electrostatic latent image is formed by irradiation with light.
Next, the developing device 915 develops the electrostatic latent image to form a toner image.

The sheet S fed from the sheet feeding unit 909 is
The skew is corrected by the registration rollers 901, and the skew is sent to the image forming unit 902 at the same timing. In the image forming unit 902, the toner image on the photosensitive drum 914 is transferred to the sheet S sent by the transfer charger 916. The sheet S to which the toner image has been transferred is placed on the separation charger 9.
And 17 is charged to a polarity opposite to that of the transfer electric device 916,
It is separated from the photosensitive drum 914.

The separated sheet S is conveyed to the fixing device 904 by the conveying device 920, and the transferred image is permanently fixed on the sheet S by the fixing device 904. The sheet S on which the image has been fixed is transferred to the main body 1 by the discharge roller pairs 1a and 1b.
Is discharged to the outside.

In this manner, an image is formed on the sheet S fed from the sheet feeding unit 909, and the sheet S is discharged to the sheet post-processing apparatus 2.

(Sheet Post-Processing Apparatus) (Sheet receiving and aligning portion of sheet post-processing apparatus) FIG.
, Sheet post-processing equipment (also known as “finisher”)
2 is provided on the side of the main body 1 of the copying machine.

The paper discharge roller 1a provided on the main body 1 of the copying machine 20 and the paper discharge roller 1b pressed by the paper discharge roller 1a constitute a paper discharge roller pair. The transport guide pair 3 receives the sheet discharged from the sheet discharge roller pair 1a, 1b of the copying machine 20, and guides the sheet into the sheet post-processing device 2. The sheet detection sensor 4 detects a sheet conveyed in the conveyance guide 3. The sheet detection of the sheet detection sensor 4 determines the alignment timing and the like, and also functions to detect whether the sheet is jammed in the conveyance guide 3 (whether the sheet is jammed). The discharge roller pair 6 rotates so as to pinch and convey the sheet in the conveyance guide 3.

The processing tray 8 receives and successively discharges the sheets discharged by the discharge roller pair 6, and stacks the sheets. The processing tray 8 is provided with a pair of alignment plates 9 that guide the both ends of the width of the sheet discharged by the discharge roller pair 6 and align the width of the sheet. The alignment plates 9 are arranged on both ends in the width direction intersecting with the sheet conveying direction. Each of the alignment plates 9 and 9 has a rack 16 integral with the alignment plate 9 and meshing with a pin-on 15 provided on a shaft of an alignment motor 14 composed of a stepping motor disposed below the processing tray 8. The processing tray 8 is provided so as to be appropriately moved in the sheet width direction by the rotation of 14.

In FIG. 1, a carry-in guide 7 is a guide for guiding a sheet discharged from the discharge roller pair 6 into the processing tray 8. A paddle 17 is provided below the loading guide 7.
Is provided. The paddle 17 is formed in a semicircular shape from a rubber material having a certain elasticity in order to reliably carry in the sheet, is in contact with the upper surface of the sheet, and rotates about a shaft 17a. I have. Also, paddle 17
Are fins 17 extending radially around an axis 17a.
b and the paddle surface 17c are integrally formed. The paddle 17 is easily deformed as the sheets are stored in the processing tray 8, and gives an appropriate conveying force to the sheets.

1, a first pulley 10 provided on the first pulley shaft 10a and a second pulley 11 provided on the second pulley shaft 11a are arranged on the processing tray 8 in FIG. Have been. A transfer belt 12 is stretched between the first pulley 10 and the second pulley 11, and an extruding claw 13 is protruded from a part of the outer periphery of the transfer belt 12.

A lower transport roller 18 is coaxially provided on the first pulley shaft 10a. Transport lower roller 18
Above the lower position, the upper transfer roller 19 is pressed between the position where the upper transfer roller 19 is pressed against the lower transfer roller 18 (the position indicated by the dotted line in FIG. 1) and the separated position away from the lower transfer roller 18 (the solid line in FIG. 1). It is provided to move.

The stopper 21 is discharged to the processing tray 8 by the discharge roller pair 6 and falls by its own weight.
7, the end of the sheet which is moved by rotation is received and regulated. One end of the stopper 12 is supported on the first pulley shaft 10a, and is always projected to a position for regulating the sheet end by a spring or the like (not shown).

(Schematic description of stapler unit (sheet binding device) of sheet post-processing device) Stapler unit 3
0 is unitized as shown by a two-dot chain line in FIG. 1 and can be pulled out from the sheet post-processing apparatus 2. This stapler unit 30
A needle driving head unit (staple driving means) 31 having a needle cartridge (not shown) below the conveying path (sheet bundle conveying area) 25 and an anvil for bending a needle driven from the needle driving head unit 31 upward. And a unit (staple receiving means) 33. The needle driving head unit 31 and the anvil unit 33 are movable in a direction (the front and back sides of the paper) crossing the sheet conveyance direction (from right to left in FIG. 1). The guide rods 33 and 34 are provided vertically so as to guide the movement (shift movement) of the anvil unit 32 and the driving head unit 31 in a direction intersecting the sheet conveying direction. Screw shaft 3
Reference numerals 5 and 36 denote screw shafts for shifting the anvil unit 32 and the driving head unit 31. The anvil drive shaft 37 and the head drive shaft 38 are drive shafts for causing the anvil unit 32 and the driving head unit 31 to perform a needle driving operation and a needle bending operation, respectively. The conveyance guide 39 guides a sheet bundle conveyed in the stapler unit 30. Upper guide (lifting prevention guide member) 46a, 46b, 4
6c and 46d can freely move in a direction crossing the sheet conveying direction.

(Folding Unit of Sheet Post-Processing Apparatus) The folding unit 50 of the sheet bundle is unitized as shown by a two-dot chain line in FIG.
Similarly to the above, the sheet can be pulled out from the sheet post-processing apparatus 2. The sheet bundle conveyance guide 53 guides a sheet bundle conveyed by being sandwiched between the upper conveyance roller 19 and the lower conveyance roller 18 located on the entry side of the stapler unit 30. The upper bundle transfer roller 51 is provided on the entrance side of the folding unit 50. Transport lower roller 52
Are arranged to face the bundle transport roller pair 51. The upper bundle transport roller 51 and the lower bundle transport roller form a pair of sheet transport rotary members.

The upper bundle transfer roller 51 is
2 is moved between a position pressed (a position indicated by a solid line in FIG. 1) and a position separated (a position indicated by a chain line in FIG. 1). The upper bundle transport roller 51 is moved until the leading end portion of the sheet bundle passes through the upper bundle transport roller 51 and the lower bundle transport roller 52 by the upper transport roller 19 and the lower transport roller 18 positioned on the entrance side of the stapler unit 30. , Is separated from the lower conveying roller 52 (the position indicated by the one-dot chain line in FIG. 1), and then moves to a position in contact with the lower roller 52 (the position indicated by the solid line in FIG. 1). .

A bundle detecting sensor 5 for detecting the end of the sheet bundle
When the leading end of the sheet bundle is detected, the bundle transport upper roller 5
1 is pressed by the upper bundle transfer roller 52 and used to set and control the folding position of the sheet bundle in the transfer direction. The thrust plate 55 has a tip thickness of 0.2
It is a stainless steel plate of about 5 mm. Fold roller pair 5
Reference numerals 7a and 57b denote cylindrical rollers having a partly flat portion and extending in a direction intersecting the sheet bundle conveying direction, and are urged in directions of pressing each other to rotate respectively.

The pushing plate 55 includes a pair of folding rollers 57a, 57a.
b, the leading edge of the folding roller pair 57a, 57b moves to the vicinity of the nip thereof. Around the upper side of the pair of folding rollers 57a and 57b, substantially arc-shaped backup guides 59a and 59b for guiding conveyance of the sheet bundle together with the conveyance guide 53 are provided. This backup guide 59a, 59b
When the leading edge of the pushing plate 55 moves to the vicinity of the nip between the pair of folding rollers 57a and 57b in conjunction with the vertical movement of the pushing plate 55, the peripheral surface of the folding roller pair 57a and 57b with respect to the sheet bundle is opened. To move to. The sheet bundle guide 56 is provided on the bundle transport upper roller 5.
1 and the sheet bundle conveyed between the bundle conveying lower rollers 52 are guided downward, so that the leading end (downstream end) of the sheet bundle hangs down in the sheet bundle passage 58. Among the bundle discharge roller pairs 60a and 60b, the roller denoted by reference numeral 60a is a driving roller, and the roller denoted by reference numeral 60b is a driven roller.

The bundle discharge stacker 80 for the folded sheet bundle is folded by the folding operation of the pair of folding rollers 57a and 57b, and stacks the sheet bundle discharged by the pair of bundle discharge rollers 60a and 60b. The folded sheet presser 81 presses the sheet bundle discharged into the bundle discharge stacker 80 by a spring or its own weight. The sheet bundle passage 58 is formed between the frame of the sheet post-processing device 2 and the bundle discharge stacker 80 as a space in which the sheet bundle can move.

The elevating tray 90 moves up and down along the frame of the sheet post-processing apparatus 2 and moves between a position indicated by a solid line and a position indicated by a two-dot chain line in FIG. The elevating tray 90 can move up and down by engaging the elevating tray support 92 with a part of a belt that is rotatably moved by driving means such as an elevating tray motor. The paper surface sensor 93 detects the uppermost surface of the sheet on the elevating tray 90. The rear end guide 94 guides the rear end of the sheet on the elevating tray 91 which moves up and down in the vertical direction. The auxiliary tray 91 is provided so as to be able to be pulled out of the elevating tray 90, and is used in a pulled-out state when storing large-sized sheets or the like.

(Detailed Description of Stapler Unit) FIG.
4 to 4, the stapler unit 30 includes left and right unit frames 40 and 41 and the frames 40 and 4.
It has guide rods 33 and 34, screw shafts 35 and 36, drive shafts 37 and 38 provided between them, an anvil unit 32 above, and a driving head unit 31 below. Head unit 3 driven into screw shaft 36
1 is engaged, and the driving head unit 31 moves in the left-right direction in FIGS. 3 and 4 by the rotation of the screw shaft 36. Anvil unit 32
Also have a similar mounting configuration. The screw shaft 36 is connected to a stapler slide motor 42 via a gear outside the unit frame 41. The drive of the stapler slide motor 42 is also transmitted to the anvil unit 32 by the timing belt 43. For this reason, the driving head unit 31 and the anvil unit 32 move in a direction intersecting with the sheet conveying direction (the left-right direction in FIGS. 3 and 4) without vertical displacement.

Accordingly, by controlling the stapler slide motor 42 to move the driving head unit 31 and the anvil unit 32 to predetermined positions in accordance with the width of the sheet, the slurry needle can be freely moved to any position. Can be driven. In addition, the slurr needle from the driving head unit 31 is received and bent by an anvil part (not shown) which approaches and separates from the anvil unit 32 in the direction of the arrow shown in FIG. I have. Therefore, the entire anvil unit 32 does not tilt.

In the case of the anvil unit 32 and the right and left unit frames 40, 41, the upper guide (lifting prevention guide member) 46a extends over the guide rod 33 and the drive shaft 37 on the upper side of the transport passage 25. , 46b, 46
c and 46d are movably supported. A question between the unit frame 41 and the upper guide 46a, between the upper guide 46a and the upper guide 46b, between the upper guide 46b and the anvil unit 32, and between the anvil unit 32 and the upper guide 46c.
, Between the upper guide 46c and the upper guide 46d, and between the upper guide 46d and the unit frame 41, compression springs (elastic members) 47a, 47b, 47c, 47d, 47
e, 47f are interposed. In accordance with the movement of the anvil unit 32, the upper guides 46a, 46b, 46c, 46
The d moves on the upper guide rod 33 and the drive shaft 37.

For example, if the binding process is performed on the right side of the sheet in FIG. 3, as shown in FIG. 4, the driving head unit 31 and the anvil unit 32 maintain the relative positional relationship and maintain the desired binding position on the right side. Move up to. Accordingly, the compression springs 47d, 47e, 47f on the right side are compressed by the anvil unit 32 in accordance with the movement of the anvil unit 32, and the upper guides 46c, 46d are pushed to the right by the compression springs 47d, 47e.

The compression springs 47a, 47b and 47c located on the left side of the anvil unit 32 extend in accordance with the movement of the anvil unit 32, and the upper guides 46a and 46b also move to the right side and move to any position in accordance with the sheet binding position. To form a guide.

Driving force such as movement of a head for driving a needle (not shown) in the driving head unit 31, movement of the needle, and bending movement of the needle in the anvil unit 32 are controlled by the coupling from the sheet post-processing apparatus 2. The unit frame 40
Unit 3 by the timing belt 45 on the side
It is also transmitted to the two sides. Moving arm 23 (see FIG. 2)
And the stopper 21 include a connecting pin 23c, a connecting lever 22,
They are connected by connecting pins 21a. Stopper 2
1 is supported on a pulley shaft 10a.

Referring to FIG. 2, a configuration will be described in which the stopper 21 for setting the needle driving position at the end of the sheet bundle moves into and out of the staple path when the driving head unit 31 moves in the sheet width direction. A stopper engaging projection 24 capable of engaging the stopper 21 with the moving arm 23 is provided below the driving head unit 31 in FIG. By the movement of the driving head unit 31,
When the stopper engagement projection 24 engages with the movement arm projection 23b, the movement arm 23 rotates counterclockwise about the rotation shaft 23a and moves to the position indicated by the two-dot chain line. Therefore, the stopper 21 is used for the driving head unit 3.
1. There is no hindrance to the movement of the anvil unit 32 in the sheet width direction.

The guides 46a, 46b, 46c and 46d of the stapler unit 30 of the embodiment described above are supported above the transport path 25. For example, the sheet is discharged with the surface on which the image is formed facing upward. In the case of coping with a copying machine, the driving head unit 31 and the anvil unit 32 are interchanged. Therefore, the position of the guide changes depending on the positions of the driving head unit 31 and the anvil unit 32.

Further, the guides 46a, 46a,
The compression springs 47a, 4 are used for the movement of 46b, 46c, 46d.
7b, 47c, 47d, 47e, 47f and the movement of the anvil unit 32 are used, but the present invention is not limited to this. A driving unit and a control device (not shown) for exclusively moving the driving guide are provided, and the driving head is provided. The guide may be moved to an arbitrary position in accordance with the movement of the unit 31 and the anvil unit 32.

Further, in the above-described embodiment, the guide is used to form the sheet passage. However, the present invention is not limited to this. As shown in FIG. A thin film-like member (film) 200 may be attached to both sides, and the sheet conveyance path 25 may be formed by the thin film-like member 200. Membrane member 20
0 is wound by a winding device 201 provided on the left and right unit frames 41 and 40, and the driving head unit 31 and the anvil portion 32
In accordance with the movement of the sheet bundle, the sheet is sent out or wound up by the winding device 201 so as to prevent the sheet bundle from floating without hindering the movement of the driving head unit and the anvil portion.

[0048]

According to the sheet binding apparatus of the present invention, since the guide member for preventing lifting is provided on the side of at least one of the staple driving means and the staple receiving means, the staple driving means, the staple receiving means and the staple driving means are provided. Thus, the sheet bundle can be securely bound without interfering with the sheet bundle binding operation of the staple driving device and the staple receiving device.

Further, since the lifting prevention guide member is moved by the staple driving means or the staple receiving means located on the side, the portion of the sheet bundle where the staple driving means and the staple receiving means do not exist is also raised. , And the misalignment of the sheet bundle is prevented, so that a desired position of the sheet bundle can be securely bound.

In the sheet binding apparatus of the present invention, the lifting prevention guide member is interposed between the staple driving means or the staple receiving means facing the lifting prevention guide member and the fixing member and urged by elastic members from both sides. In this case, the lifting prevention guide member is always at substantially the center between the staple driving means or the staple receiving means and the fixing member, so that the lifting of the sheet bundle can be efficiently prevented.

In the sheet binding apparatus according to the present invention, if a plurality of lifting prevention guide members are provided,
The lifting of the sheet bundle can be reliably prevented.

In the sheet binding apparatus according to the present invention, the lift-up prevention guide member is a film-like member stretched between the staple driving means or the staple receiving means and the fixing member facing the lift-up prevention guide member. In some cases, the film-like member is fed or wound up with the movement of the staple driving device and the staple receiving device to the binding position, so that the film member always faces the sheet bundle, and Floating can be reliably prevented.

The image forming apparatus of the present invention is provided with the above-mentioned sheet binding apparatus capable of preventing a sheet from rising and securely binding a predetermined position of the sheet bundle. There is no damage to the resulting image.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a sheet post-processing apparatus provided with a stapler unit which is a sheet binding apparatus of the present invention.

FIG. 2 is a front view of a stapler unit which is the sheet binding device of the present invention.

FIG. 3 is a diagram of the stapler unit viewed from a sheet conveying direction.

FIG. 4 is a diagram illustrating the operation of the stapler unit.

FIG. 5 is a diagram of a stapler unit according to another embodiment, and is a diagram corresponding to FIG. 3;

FIG. 6 is a schematic front sectional view of an image forming apparatus including a sheet post-processing apparatus equipped with a stapler unit in a main body.

FIG. 7 is a front view of a conventional stapler unit.

FIG. 8 is a diagram for explaining a problem of the stapler unit of FIG. 7;

[Explanation of symbols]

P Sheet Bundle 1 Body of Copying Machine (Image Forming Apparatus) 2 Sheet Post-Processing Apparatus 12 Transfer Belt 13 Push Claw 20 Copying Machine (Image Forming Apparatus) 25 Transport Path (Sheet Bundle Transporting Area) 30 Stapler Unit (Sheet Binding Apparatus) 31 Driving head unit (staple driving means) 32 Anvil unit (staple receiving means) 46a Upper guide (lift guide prevention member) 46b Upper guide (lift guide prevention member) 46c Upper guide (lift guide prevention member) 46d Upper guide (lift guide) Prevention member) 47a Compression spring (elastic member) 47b Compression spring (elastic member) 47c Compression spring (elastic member) 47d Compression spring (elastic member) 47e Compression spring (elastic member) 47f Compression spring (elastic member) 50 Folding unit 200 Membrane Member 201 winding Location 902 image forming unit (image forming means)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Tachibana 430-1, Kobayashi, Masuho-cho, Minamikoma-gun, Yamanashi F-term (reference) 3F108 GA02 GA03 GA04 GB01 GB03 HA02 HA36

Claims (5)

[Claims] 1. A staple driving means disposed on opposite sides of a sheet bundle conveyance area so as to be able to approach and separate from each other, and staple driving means for driving staples into a sheet bundle conveyed through the conveyance area, and staple driving means. A staple receiving unit that receives and folds the staples according to a staple driving position in a direction that intersects a conveying direction of the sheet bundle. A lifting prevention guide member for preventing the lifting and guiding the sheet bundle is movable to at least one side of at least one of the staple driving means and the staple receiving means in accordance with the movement of the means. A sheet binding device, comprising: 2. The lifting prevention guide member is interposed between the staple driving means or the staple receiving means and the fixing member facing the lifting prevention guide member and is urged by elastic members from both sides. The sheet binding device according to claim 1, wherein: 3. The sheet binding apparatus according to claim 2, wherein a plurality of the lift prevention guide members are provided. 4. The lifting prevention guide member is a film-like member stretchably wound between the staple driving means or the staple receiving means and the fixing member facing the lifting prevention guide member. The sheet binding device according to claim 1, wherein: 5. The sheet binding apparatus according to claim 1, wherein an image forming unit that forms an image on a sheet, and a sheet bundle on which an image is formed by the image forming unit are bound. An image forming apparatus.