JP2007062142A - Bookbinding equipment and image forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming system having bookbinding equipment which executes reliable cover gluing-on bookbinding, improves the quality of finished bookbinding and maintains the productivity of a high-speed processing. <P>SOLUTION: The bookbinding equipment, which sticks a cover to the back of a paper bundle and subjects it to a gluing-on bookbinding processing, has a holding means which holds the paper bundle having the back glued, a pressurizing member which is disposed opposite to the back of the paper bundle held by the holding means and comes into contact with the glue-coated surface of the back and the cover to stick them together, a pressing means which urges the pressurizing means so that it is capable of moving upward and downward, and a butting member which is provided in a holding means body that maintains the holding means and which projects in parallel with the surface of the paper bundle held by the holding means and comes into contact with the pressurizing member. The sticking surface of the back of the paper bundle held by the holding means and the fore end part of the butting member coming into contact with the pressurizing member are so disposed as to be on the same plane. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bookbinding apparatus for producing a booklet by covering the back and front and back surfaces of a sheet bundle with a cover sheet, and in particular, includes a bookbinding apparatus that can be connected to an image forming apparatus such as a copying machine, a facsimile machine, or a printer. The present invention relates to an image forming system.

  As the bookbinding process, a staple binding process and a gluing bookbinding process are known for a single sheet bundle in which printed sheets are stacked.

  As a glue binding apparatus, a glue discharge nozzle is used to discharge glue on paper, a glue wheel is installed in the glue storage box, glue is attached to the outer periphery of the rotating glue wheel, and the outer periphery of the glue wheel is brought into contact with the paper. A contact transfer device, a hot melt application device that discharges a mixture of hot melt agent (thermal adhesive) and heated compressed air from a nozzle, and a sheet bundle while heating a tape pre-applied with adhesive glue. A tape applicator for attaching to the back is known.

  For example, recent electrophotographic image forming apparatuses have high-speed performance, multi-functions, network functions, etc., and their use as printing apparatuses has been expanded by connecting large-capacity paper feeders and large-capacity stackers. Yes.

  When the image forming apparatus is used as a printing apparatus, printing to bookbinding can be performed by a single apparatus by connecting a bookbinding apparatus that binds printed matter.

In the bookbinding apparatuses described in Patent Document 1 and Patent Document 2, an image forming system in which an image forming apparatus and a miniaturized glue binding apparatus are connected is proposed.
JP 2004-209869 A JP 2004-209870 A

  In the gluing bookbinding apparatus disclosed in Patent Literature 1 and Patent Literature 2, the pressure member installed in the cover sticking means is fixed during the cover sticking process, and the folding member is raised and horizontally moved to the back of the sheet bundle. A booklet is produced by folding the attached cover K. However, the drive mechanism for moving the bending member up and down and horizontally moves is large and complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bookbinding apparatus that solves the above-described problems and improves the bookbinding apparatus to improve the finished quality of bookbinding, and an image forming system including the bookbinding apparatus.

  The above object is solved by the following bookbinding apparatus and image forming system of the present invention.

  (1) A bookbinding apparatus according to the present invention is a bookbinding apparatus that performs bookbinding processing by attaching a cover to the back of a sheet bundle, and gripping means for gripping a sheet bundle that has been subjected to paste application processing on the back of the sheet bundle; A pressure member disposed opposite to the back portion of the sheet bundle gripped by the gripping means and abutting and sticking to the adhesive application surface of the back portion of the sheet bundle and the cover, and the pressure member can be raised and lowered And a pressing member that is installed in a gripping device main body that holds the gripping device and that protrudes in parallel with the paper surface of the sheet bundle gripped by the gripping device and abuts against the pressure member. The sticking surface of the back portion of the sheet bundle gripped by the gripping means and the tip portion of the abutting member that contacts the pressure member are arranged on the same plane. is there.

  (2) An image forming system according to the present invention includes an image forming apparatus main body having an image forming unit and a sheet conveying unit, and sheets formed with the image forming apparatus main body are stacked and a cover is attached to a sheet bundle. It comprises the bookbinding apparatus described in (1) that performs bookbinding processing.

  The following effects can be obtained by the bookbinding apparatus and the image forming system of the present invention.

  (1) The pressurizing member that presses the cover attached to the back of the sheet bundle is installed so as to be swingable in the longitudinal direction on the top side and the ground side of the back part of the sheet bundle to be bound. Since the sheet bundle and the cover are brought into close contact with each other by the spring bias, occurrence of sticking failure at the time of sticking is prevented, and the finished quality of bookbinding is improved.

  (2) An image forming system provided with the bookbinding apparatus of the present invention automatically attaches a bundle of sheets and a cover sheet to a sheet transported from the main body of the image forming apparatus, and automatically performs image forming processing continuously. Bookbinding processing can be performed.

  Next, a bookbinding apparatus of the present invention and an image forming system including the bookbinding apparatus will be described with reference to the drawings.

[Image forming system]
FIG. 1 is an overall configuration diagram of an image forming system including an image forming apparatus A, a bookbinding apparatus B, and a paper discharge apparatus C. FIG. 2 is an external perspective view of the image forming system.

[Image forming apparatus]
The image forming apparatus A includes an image forming unit in which a charging unit 2, an image exposure unit 3, a developing unit 4, a transfer unit 5 </ b> A, a charge eliminating unit 5 </ b> B, and a cleaning unit 6 are arranged around a rotating image carrier 1. The image forming means uniformly charges the surface of the image carrier 1 by the charging means 2 and then performs exposure scanning based on the image data read from the document by the laser beam of the image exposure means 3 to form a latent image. Then, the latent image is reversely developed by the developing means 4 to form a toner image on the surface of the image carrier 1.

  The paper S fed from the paper storage unit 7A is sent to the transfer position. The toner image is transferred onto the paper S by the transfer means 5A at the transfer position. Thereafter, the charge on the back surface of the sheet S is erased by the charge eliminating unit 5B, separated from the image carrier 1, conveyed by the conveying unit 7B, heated and fixed by the fixing unit 8, and discharged from the sheet discharge roller 7C.

  When image formation is performed on both sides of the sheet S, the sheet S heated and fixed by the fixing unit 8 is branched from the normal sheet discharge path by the conveyance path switching unit 7D, and is switched back in the reverse conveyance unit 7E. After the reversal, it passes through the image forming unit again, forms an image on the back surface of the paper S, and is discharged from the paper discharge roller 7C to the outside of the apparatus via the fixing unit 8. The paper S discharged from the paper discharge roller 7C is sent to the bookbinding apparatus B.

  The developer remaining on the surface of the image carrier 1 after image processing is removed by the cleaning unit 6 to prepare for the next image formation.

[Bookbinding device]
FIG. 3 is a cross-sectional view showing the sheet conveyance path of the bookbinding apparatus B according to the present invention.

  The bookbinding apparatus B includes a sheet introduction unit 10, a sheet discharge unit 20, a sheet bundle storage unit 30, a sheet bundle conveyance unit 40, a glue application unit 50, a cover sheet supply unit 60, a cover sheet cutting unit 70, a cover sheet exterior unit (case binding unit). 80, an aligning means 90, and a booklet conveying means 100. Each of these means is arranged in a column in a substantially vertical direction in the bookbinding apparatus main body.

<Paper introduction means 10>
The paper S introduced into the paper introduction unit 10 is nipped and conveyed by the entrance rollers 11 and 12, and is branched to either the paper discharge unit 20 or the paper bundle storage unit 30 by the conveyance path switching unit 31.

<Discharge means 20>
When the sheet conveyance is set, the conveyance path switching unit 31 blocks the conveyance path to the sheet bundle conveyance unit 40 and opens the conveyance path to the paper discharge unit 20.

  The sheet S passing through the conveyance path of the sheet discharge unit 20 is nipped by the conveyance rollers 21 and 22 and conveyed upward, and is discharged and stored on the fixed sheet discharge table 24 at the top of the apparatus by the sheet discharge roller 23. On the fixed sheet discharge table 24, the sheets S discharged from the image forming apparatus A can be directly received and a maximum of about 200 sheets can be stacked.

<Paper bundle accommodating means 30>
The sheet S branched to the left in the drawing on the downstream side in the sheet conveyance direction by the conveyance path switching unit 31 is sandwiched between the conveyance rollers 32, 33, 34, 35, and 36 and is accommodated in a predetermined position of the sheet bundle accommodation unit 30. Stacked, a sheet bundle Sa composed of a predetermined number of sheets S is formed. The sheet bundle accommodating means 30 includes a sheet placing table 37 that is inclined, a movable sheet rear end positioning member 38, a sheet width aligning member 39 that positions the sheet width direction, and the like.

<Paper bundle conveying means 40>
The sheet bundle Sa stacked on the sheet placing table 37 of the sheet bundle accommodating means 30 is conveyed obliquely downward by an unillustrated pushing means. After that, the sheet bundle Sa is gripped by the gripping means 41 of the sheet bundle transport means 40, and is swung so that the surface (back) for applying the glue to the sheet bundle Sa is turned downward while holding the sheet bundle Sa. Stopped in position.

<Glue application means 50>
The glue application unit 50 includes a glue application member (also referred to as application roller) 51, a rotation unit 52 that rotationally drives the application roller 51, a glue container 53 that stores glue, and a back surface of the bookbinding apparatus B that supports the glue container 53. A movable body 54 that can move from the initial position on the side to the glue application position on the front side, and a moving means (not shown) that reciprocates the movable body 54.

  FIG. 4 is a cross-sectional view of the bookbinding apparatus B showing the glue application processing to the sheet bundle Sa, and FIG. 5 is a perspective view of the glue application means 50 and the gripping means 41.

  The moving body 54 of the glue applying unit 50 is moved by a driving unit (not shown) in a direction parallel to the longitudinal direction of the lower surface of the sheet bundle Sa held upright by the gripping unit 41.

  The moving body 54 starts moving from the initial position on the back side of the bookbinding apparatus B, is moved along the guide member 55, stops at a predetermined position on the front side of the bookbinding apparatus B, and then reversely drives to return to the initial position. To do.

  The application roller 51 immersed in the adhesive container 53 containing the adhesive N is rotated by the motor M1 and the rotating means 52 of the adhesive application driving means. The application roller 51 applies the glue N in the longitudinal direction of the lower surface of the sheet bundle Sa held in an upright state by the forward movement or reciprocation of the moving body 54.

<Cover Supply Unit 60>
As shown in FIG. 3, the cover sheet K accommodated in the sheet supply tray 61 of the cover sheet supply means 60 is separated and fed by the sheet supply means 62, and is sandwiched between the transport rollers 63, 64, 65 to be covered with the cover sheet exterior. It is conveyed to the means 80.

<Cover cutting means 70>
FIG. 6 is a cross-sectional view showing the cover sheet exterior means 80 and the cover sheet cutting means 70 at the lower limit position.

  On the upper side of the cover sheet supply means 60, a cover sheet cutting means 70 is integrally formed on the right side of a cover sheet exterior means 80, which will be described later. The cover cutting means 70 cuts the length in the conveyance direction of the cover K to a predetermined length.

  The cover sheet cutting means 70 is a roller cutter unit including a rotary blade 71 and a fixed blade 72. The rotary blade 71 rotates while being in sliding contact with the fixed blade, and shears the cover K in the cover width direction. The scrap portion of the sheared cover sheet K falls and is stored in the waste box 73.

  The cutting length of the cover sheet K is a length obtained by adding the length of the back portion of the sheet bundle Sa to the length of two sheets in the traveling direction of the sheet S. When the sheet size, the number of sheets, and the sheet thickness are selected or detected in the operation unit 9 of the image forming apparatus A, the control unit sets a predetermined cutting length of the cover sheet K. The length of the cover sheet K before cutting is determined in advance corresponding to the maximum number of sheets.

<Cover cover means 80>
The cover sheet K stored in the sheet supply tray 61 of the cover sheet supply means 60 is separated and fed by the sheet supply means 62, sandwiched between the conveying rollers 63, 64, 65, and introduced into the cover sheet exterior means 80. Then, it is conveyed in the reverse direction and enters the cover cutting means 70. The cover sheet K cut to a predetermined length by the cover sheet cutting means 70 is conveyed again to the cover sheet exterior means 80.

  The cover sheet K introduced into the cover sheet exterior means 80 is transported by the transport roller 65, travels along the guide plate 87, passes through the nipping position between the transport roller 81 and the driven roller 883 that are driven to rotate, and is further driven and rotated. Passes through the nipping position between the conveying roller 82 and the driven roller 883.

  The motor M2A of the second drive means swings and drives the cover sheet holding member 88 via a drive transmission system Z1 composed of a belt and a gear train. The motor M2B of the second drive means swings and drives the cover sheet holding member 89 via a drive transmission system Z2 including a belt and a gear train.

  The cover holding member 88 is rotatably supported by a rotary shaft 881 that can be rotated by being connected to the final gear of the drive transmission system Z1, a lever 882 that is fixed to the rotary shaft 881 and can be swung, and one end of the lever 882. And a driven roller 883.

  The cover holding member 89 is connected to the final gear of the drive transmission system Z2 and can rotate, a lever 892 fixed to the rotation shaft 891 and swingable, and rotatably supported by one end of the lever 892. And a driven roller 893.

  When the cover sheet K enters along the guide plate 87 in the cover sheet exterior means 80, the motor M2A starts driving, swings the lever 882, and presses the transport roller 81 that rotates the driven roller 883. . At substantially the same time, the motor M2B starts to drive, swings the lever 892, and presses the driven roller 893 against the conveying roller 82 that rotates.

  The cover sheet K entering along the guide plate 87 is nipped and conveyed by the conveyance roller 81 and the driven roller 883 on the upstream side in the conveyance direction, and is subsequently nipped by the conveyance roller 82 and the driven roller 893 on the downstream side in the conveyance direction. After being conveyed, it is stopped at a predetermined position.

  FIG. 7 is a cross-sectional view showing the upper limit position of the cover sheet exterior means 80.

  While the cover K placed on the cover cover means 80 is moved to the vicinity of the paste application surface by the first drive means of the cover cover means 80, the cover holding members 88 and 89 are shaken by the motor M3 of the first drive means. The cover K is pressed and held. As a result, the cover K is prevented from moving during the movement of the cover cover means 80, and is accurately adhered to the glue application surface of the sheet bundle Sa.

  When the detection means PS detects that the cover sheet K has approached the glue application surface of the sheet bundle Sa, the cover pressing by the cover sheet holding members 88 and 89 is released by the motors M2A and M2B.

<Production of booklet>
FIG. 8 is a perspective view showing a booklet production process. FIG. 8A is a perspective view showing the cover sheet K placed on the movable casing 84 of the cover sheet exterior means 80 and the sheet bundle Sa attached to the center of the cover sheet K. FIG. FIG. 8B is a perspective view showing a state in which the glued sheet bundle Sa is bound and bound by the cover sheet K folded by the first folding member 86A, the second folding member 86B, and the pressure member 83. It is. FIG. 8C is a perspective view of the booklet Sb bound and bound.

  In these drawings, U is the top side representing the top surface when the sheet bundle Sa and booklet Sb are upright, and L is the ground side representing the bottom side of the sheet bundle Sa, booklet Sb, sheet bundle Sa, and booklet Sb. Show.

  FIG. 9 is a cross-sectional view showing the cover K folding process.

  FIG. 9A shows the initial position of cover cover folding. The sheet bundle Sa to which the glue has been applied is held by the fixed-side holding member 41A and the moving-side holding member 41B of the holding unit 41, and comes into contact with the cover sheet K placed on the cover cover exterior unit 80.

  At this time, the cover sheet pressing surface XA of the first bending member 86A stands by at a position separated by a distance L1 from the sheet bundle gripping surface Y (hereinafter referred to as the reference plane Y) of the fixed gripping member 41A. Further, the cover sheet pressing surface XB of the second bending member 86B stands by at a position separated from the reference surface Y of the fixed-side gripping member 41A by a distance L2. This distance L2 is a position separated by a distance L1 from the maximum thickness Tmax of the sheet bundle Sa capable of case binding processing.

  FIG. 9B shows a cover folding start position. The sheet bundle Sa is gripped and lowered by the fixed gripping member 41A and the movable gripping member 41B, the pressing member 83 is pushed down against the bias of the spring 91, and stops at the folding start position.

  FIG. 9C shows a cover folding end position. The first bending member 86A moves a distance L1, and the cover sheet pressing surface XA presses one side surface of the sheet bundle Sa that contacts the reference surface Y through the cover sheet K. At the same time, the second bending member 86B also moves the distance L1, and presses the side surface of the sheet bundle Sa.

<Pressure member swing mechanism>
When the adhesive pasting surface extending from the top side to the ground side of the back of the sheet bundle Sa gripped by the gripping member 41 is in contact with the pressure member 83 in an inclined state with respect to the horizontal plane Hz, the conventional shaking is performed. In the pressure member that does not have a moving mechanism, the back portion of the sheet bundle Sa held by the holding member 41 and the pressure member of the cover sheet exterior means are stuck in a one-to-one state, and sticking failure occurs.

  The pressing means of the present invention is a pressurizing spring that is urged by a spring so as to pressurize the bonding surface from the top side U to the ground side L of the sheet bundle Sa so as to make it evenly contact. A pressure member 83 is provided.

  FIG. 10 is a side sectional view showing a state where the back portion of the sheet bundle Sa is held horizontally and the pressure member 83 presses the sheet bundle Sa. FIG. 11 is a plan view of the pressing member 83 and the pressing means.

  A pressing means is disposed on the bottom surface side of the pressing member 83. The pressure member 83 is urged upward in the vertical direction by two springs 91a, 91b, 91c shown in FIG. The springs 91a, 91b, 91c are positioned by corresponding bosses 91A. The upper limit position of the pressing member 83 biased by the springs 91a, 91b, 91c is regulated by two stoppers 92 fixed in the vicinity of both side ends of the pressing member 83.

  On the inner side surfaces of the two stoppers 92, the side end portions of the pressure member 83 slide to regulate the horizontal position. Two rods 93 are planted in a hanging state near the side end of the pressure member 83. The rod 93 is fitted into a guide member 94 fixed to the main body of the cover exterior means 80. The guide member 94 has a hole with an oval cross section parallel to the longitudinal direction of the pressure member 83, that is, the pasting surface from the top side U to the ground side L. Therefore, the short axis direction of the hole of the oval cross section is fitted and positioned with the outer diameter of the rod 93 to restrict the movement of the pressure member 83 on the short side. In addition, since there is a degree of freedom in the long axis direction of the hole portion of the oval cross section, even if the rod 93 is inclined due to the inclination of the pressure member 83, there is no interference.

  In this way, the longitudinal direction from the front surface side F to the rear surface side R of the pressing member 83 shown in FIG. Even if the back part on which the adhesive sticking surface is formed is inclined in the longitudinal direction connecting the top part side U and the ground part side L, it is in contact with the cover K placed on the pressure member 83 uniformly, The back portion of the sheet bundle Sa and the cover K are adhered closely.

  Next, the inclination on the short side of the pressure member 83 will be described.

  FIG. 12 is a partial cross-sectional view of the bookbinding apparatus before improvement showing a state in which the cover sheet K is stuck to the back of the sheet bundle Sa.

  The gripping means 41 that grips the sheet bundle Sa includes a fixed-side gripping member 41A and a moving-side gripping member 41B. One sheet surface of the sheet bundle Sa abuts on the reference surface Y of the fixed side holding member 41A, and the other sheet surface of the sheet bundle Sa abuts on the surface of the moving side grasping member 41B.

  The gripping means 41 can grip a sheet bundle Sa composed of a maximum of about 200 sheets. In this case, the back portion of the sheet bundle Sa is disposed at a symmetrical position with respect to the approximate center of the pressing member 83 in the short side direction.

  However, when the number of sheets of the sheet bundle Sa is small, the back portion of the sheet bundle Sa abuts on a position as shown in the figure shifted from the center of the pressure member 83 urged by the spring 91 and becomes an eccentric load. The pressurizing member 83 is inclined, and the sheet bundle Sa is joined to the cover K in a deformed state, so that the appearance quality of the booklet is deteriorated.

  In addition, due to the inclination of the pressure member 83, the rod 93 implanted in the pressure member 83 is inclined, and the inner wall of the upright guide member 94 that guides the rod 93 so that the rod 93 can be moved up and down, and the outer peripheral surface of the rod 93. Due to abnormal contact, the pressurizing member 83 may not move up and down smoothly, and there is a possibility that a defect may occur in the adhesion between the sheet bundle Sa and the cover K.

<Bending the cover>
FIG. 13 is a cross-sectional view illustrating a process of sticking the cover sheet K to the sheet bundle Sa.

  FIG. 13A shows a cover folded state in which the adhesive sticking surface of a small number of sheet bundles Sa gripped by the gripping means 41 is in contact with the cover sheet K placed on the upper surface of the pressure member 83.

  The sheet bundle Sa to which the glue has been applied is held by the fixed-side holding member 41A and the moving-side holding member 41B of the holding means 41, and comes into contact with the cover sheet K placed on the pressing member 83.

  An abutting member 95 is fixed to the gripping means 41. The abutting member 95 protrudes in parallel with the paper surface of the sheet bundle Sa sandwiched between the fixed-side gripping member 41A and the moving-side gripping member 41B of the gripping means 41 and abuts against the pressing member 83 so as to be able to contact and separate.

  The abutting member 95 is arranged on the upper surface of the pressure member 83 on the side facing the reference surface Y of the fixed-side gripping member 41A with respect to the rod 93 of the pressure member 83 and at a position where the cover sheet K is not placed. Has been. That is, in the plan view shown in FIG. 11, the reference surface Y of the fixed-side gripping member 41 </ b> A is disposed above the pressure member 83 in a direction close to the illustrated left side surface, and above the pressure member 83, the right side illustrated. An abutting member 95 is arranged above the spring 91b at a position close to the surface.

  The lower end portion of the abutting member 95 is arranged so as to be substantially flush with the back surface of the cover sheet K attached to the back portion of the sheet bundle Sa sandwiched between the fixed side holding member 41A and the moving side holding member 41B. Has been.

  FIG. 13B shows the cover folding start state. The sheet bundle Sa is gripped by the gripping member 41 and descends, and the back of the sheet bundle Sa pushes down the pressure member 83 that holds the cover sheet K, and reaches the folding start position. As the gripping member 41 is lowered, the abutting member 95 fixed to the gripping member 41 is also lowered, and the tip of the abutting member 95 presses the upper surface of the pressure member 83. The pressure member 83 is held in a horizontal state by the back portion of the sheet bundle Sa and the abutting member 95 and descends against the spring bias, and the cover sheet K placed on the upper surface of the pressure member 83 and the sheet bundle The pasting surface of the back portion of Sa is evenly closely contacted.

  Thereafter, as shown in FIG. 9C, the cover sheet K is bent by the horizontal movement of the first bending member 86A and the second bending member 86B.

<Ejection of booklet>
After the cover K folding process is completed, the cover cover exterior means 80 is lowered and retracted by the lowering drive of the belt 85 shown in FIG. As a result, the lower end of the belt contacts the discharge belt 101 and is slid in the transport direction by the discharge belt 101. The booklet Sb is placed on the surface of the rotating discharge belt 101 and conveyed, discharged outside the apparatus, and accommodated in the paper discharge apparatus C.

<Discharge device C>
The booklet Sb discharged by the discharge belt 101 is placed on the elevating / discharging tray 103 of the sheet discharge device C through the discharge opening 102 shown in FIG. When the booklet Sb is discharged and stacked on the lifting / lowering tray 103, the lifting / lowering tray 103 is sequentially lowered by the rotating wire 104. When the elevating / discharging tray 103 reaches the bottom dead center, the booklet Sb is transferred to the transport belt 105 and is discharged out of the apparatus by the rotation of the transport belt 105.

  Note that the bookbinding apparatus B of the present invention is formed in an independent apparatus and the sheet bundle Sa processed by another image forming apparatus is loaded on the sheet bundle accommodating means 30, and then the glue application process and the cover cover exterior process are performed. It is also possible to make case binding.

1 is an overall configuration diagram of an image forming system including an image forming apparatus, a bookbinding apparatus, and a paper discharge apparatus. 1 is an external perspective view of an image forming system. FIG. 3 is a cross-sectional view illustrating a paper conveyance path of the bookbinding apparatus according to the present invention. FIG. 3 is a cross-sectional view of a bookbinding apparatus showing a glue application process on a sheet bundle. The perspective view of an adhesive application means and a holding means. Sectional drawing of a cover cutting means and a cover exterior means. Sectional drawing which shows the upper limit position of a cover exterior means. The perspective view which shows the preparation process of a booklet. Sectional drawing which shows the bending process of a cover. FIG. 4 is a side cross-sectional view illustrating a state where a back portion of a sheet bundle is held horizontally and a pressure member presses the sheet bundle. The top view of a pressurization member and a press means. The fragmentary sectional view of the bookbinding apparatus before improvement which shows the state which adheres a cover to the back part of a sheet bundle. Sectional drawing which shows the process of sticking a cover sheet on a sheet bundle.

Explanation of symbols

41 Grasping means 41A Fixed-side gripping member 41B Moving-side gripping member 80 Cover cover exterior means (case binding means)
83 Pressure member 86A First bent member 86B Second bent member 91, 91a, 91b, 91c Spring 92 Stopper 93 Rod 95 Abutting member A Image forming apparatus B Bookbinding apparatus K Cover sheet Sa Sheet bundle Y Sheet bundle gripping surface ( Reference plane)

Claims (2)

In a bookbinding device that performs bookbinding processing by attaching a cover to the back of a stack of paper,
Gripping means for gripping the sheet bundle that has been subjected to the paste application process on the back of the sheet bundle;
A pressure member that is disposed to face the back of the sheet bundle gripped by the gripping means, and abuts against and adheres to the glue application surface of the back of the sheet bundle and the cover;
A pressing means for urging the pressurizing member to move up and down;
An abutting member that is installed in a gripping means main body that holds the gripping means and protrudes in parallel with a paper surface of a sheet bundle gripped by the gripping means and contacts the pressure member;
The bookbinding apparatus, wherein the sticking surface of the back portion of the sheet bundle gripped by the gripping means and the tip portion of the abutting member that contacts the pressure member are arranged on the same plane. 2. The bookbinding apparatus according to claim 1, wherein the image forming apparatus main body having an image forming unit and a paper transport unit, and the bookbinding process for stacking sheets formed by the image forming apparatus main body and attaching a cover sheet to the sheet bundle. An image forming system comprising:

Images