Patent Application
20180016111
The present invention relates to a sheet processing apparatus which creates a booklet by saddle-binding and half-folding a sheet bundle including a plurality of sheets.
Conventionally, there is known a sheet processing apparatus which creates a booklet by binding a sheet bundle by a saddle-binding processing unit, and performing a folding process by a folding processing unit. The booklet created in this manner has a problem that a crack occurs at the folded part of the outer sheet when the sheet bundle is thin, and the created booklet opens when the sheet bundle is thick.
The crack occurring at the folded part is a phenomenon in which the folded part of the outer sheet cracks because the elongation amount of the outer sheet of the sheet bundle becomes larger than the elongation amount of the inner sheet when the folding process is performed. This phenomenon easily occurs when the using sheet is thick, and the crack occurring at the folded part of the outermost sheet of a booklet deteriorates the appearance. In order to prevent this, there is known a sheet scoring apparatus which prevents occurrence of a crack at a folded part by scoring a sheet at the folded part in advance as disclosed in Japanese Patent Laid-Open No. 2011-57363.
In addition, the reason that a booklet opens is that a sheet bundle is thick and folding is not enough. In order to prevent this, there is known an additional folding unit called a square fold which flatly crushes a folded part as disclosed in Japanese Patent Laid-Open No. 2007-144679.
However, scoring is not effective in any booklet. The scoring in which a sheet bundle is firmly folded is effective in a thin sheet bundle. However, folding to a thick sheet bundle in which cracks hardly occur at the folded part is not enough and the scoring merely produces a booklet having a score at the folded part. Although the thick booklet is subjected to square fold to be strongly folded by flattening the folded part, the booklet having a score on the flattened spine is created. For this reason, it is necessary to perform a troublesome work for operator to create a booklet to determine whether scoring a sheet bundle is necessary.
A sheet processing apparatus according to an embodiment of the present invention includes: a sheet processing apparatus comprising: a scoring unit which scores a sheet; a folding unit which folds a sheet bundle including a plurality of sheets; a pressing unit which presses a folded part of the sheet bundle folded by the folding unit; and a controller which determines, based on information on the sheet bundle, whether the scoring unit scores the sheet included in the sheet bundle to be folded and whether the pressing unit presses the folded part of the sheet bundle.
According to an embodiment of the present invention, it is possible for a sheet processing apparatus to create a sheet bundle under appropriate creating conditions according to a sheet bundle to be created.
Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
Suitable embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that, the dimensions, materials, shapes, relative positions thereof, and the like of the components described in the following embodiments should be appropriately changed according to the configuration of an apparatus to which the present invention is applied, and various conditions. Therefore, the scope of the present invention is not limited to them unless otherwise specified.
A cassette 909a or 909b in the image forming apparatus main body 600 supplies a sheet S, and toner images of four colors are transferred on the sheet S by yellow, magenta, cyan, and black photosensitive drums 914a to 914d and the like constituting an image forming portion. Then, the sheet S is conveyed to a fixing unit 904 to fix the toner images. In a one-side image forming mode, the sheet S is directly discharged from a pair of discharge rollers 907 to the outside of the apparatus main body. In a both-side image forming mode, the sheet S is delivered from the fixing unit 904 to a reversing roller 905. When the rear end of the sheet in the sheet conveying direction passes over a reversing switching portion P, the reversing roller 905 is reversely rotated, and the sheet S is conveyed in the direction of both-side conveying rollers 906a to 906f which is the direction opposite to the conveying direction. Then, toner images of the four colors are again transferred on the other side of the sheet by the yellow, magenta, cyan, and black photosensitive drums 914a to 914d. The sheet S having both sides on which the toner images are transferred is conveyed to the fixing unit 904 again to fix the toner images and is discharged from the pair of discharge rollers 907 to the outside of the apparatus main body.
The RAM 655 is used as an area for temporarily holding control data and as a work area for computation accompanying control. The external interface 637 is an interface of a computer (PC) 620, develops print data into an image, and outputs it to the image signal controlling portion 634. The image reader controlling portion 633 outputs an image read by an image sensor to the image signal controlling portion 634, and the image output from the image signal controlling portion 634 to the printer controlling portion 635 is input to an exposure controlling portion.
The scoring apparatus controlling portion 638 is equipped in the scoring apparatus 200 and performs drive control of the entire scoring apparatus by exchanging information with the CPU circuit portion 630 of the image forming apparatus. The finisher controlling portion 636 is equipped in the finisher 100 and performs drive control of the entire finisher by exchanging information with the CPU circuit portion 630 of the image forming apparatus. The scoring apparatus controlling portion 638 and the finisher controlling portion 636 control various motors and sensors.
A sheet process in the scoring apparatus 200 is performed according to the settings made by the user through the operation portion 601 provided on the image forming apparatus main body 600.
The sheet discharged from the image forming apparatus main body 600 is transferred to a pair of inlet rollers 202 of the scoring apparatus 200. At this time, the sheet delivery timing is also detected simultaneously by an inlet sensor 201.
When the scoring process is not performed to the sheet, the path is switched to the bypass A by the switching member 217, and the sheet is conveyed by pairs of conveying rollers 203, 204, and 205 and a pair of discharge rollers 206, and delivered to the downstream finisher 100.
When the scoring process is performed to the sheet, the path is switched to the scoring path B by the switching member 217, the sheet is conveyed to the processing portion by pairs of conveying rollers 208, 211, and 252, and a sheet edge detecting sensor 213 detects the edge of the sheet. After the sheet is stopped at a predetermined position in the conveying direction, a scoring unit (scoring portion) 220 operates to score the sheet. The scored sheet is conveyed again by pairs of conveying rollers 209, 210, 214, 215, and 216, and the pair of discharge rollers 206, and delivered to the downstream finisher 100.
As shown in
The finisher 100 takes in a sheet conveyed from the image forming apparatus main body 600 through the scoring apparatus 200, and performs a process to the taken sheet. For example, the finisher 100 performs a sheet process, such as a process of aligning a plurality of taken sheets and bundling it as one sheet bundle, a stapling process (binding process) of stapling the rear end side of the sheet bundle, a sorting process, a non-sorting process, or a saddle binding process of creating a booklet.
As shown in
A switching member 513 provided at the end of the conveying path 520 switches the path to an upper discharging path 521 or a lower discharging path 522 connected to the downstream side. The upper discharging path 521 discharges the sheet to an upper stack tray 592. On the other hand, the lower discharging path 522 discharges the sheet to a processing tray 550. The sheets discharged onto the processing tray 550 are stored in a bundle by sequentially performing conveyance direction alignment in which the rear end of the sheet is butted to a rear end reference wall 561 by a return paddle 552 and a return belt 553, and width direction alignment by an aligning plate (not shown). The sheets stored in a bundle (sheet bundle) are subjected to a sorting process or a stapling process according to the settings from the operation portion 1, and then discharged to stack trays 591 and 592 by a pair of bundle discharge rollers 551.
The stapling process is performed by a stapler 560, and the stapler 560 is movable in the width direction orthogonal to the conveying direction, and can staple the sheets at an arbitrary position thereof. The stack trays 591 and 592 are configured to be movable in the vertical direction. The upper stack tray 592 receives the sheets from the upper discharging path 521 and the processing tray 550, and the lower stack tray 591 receives the sheets from the processing tray 550. In this manner, a large number of sheets can be stacked on the stack trays 591 and 592, and the stacked sheets are aligned by regulating the rear end thereof by a rear end guide 593 extending in the vertical direction.
Next, a configuration of a saddle bookbinding portion 800 in the finisher 100 will be described. The sheet the path of which is switched to the right side by a switching member 514 provided in the middle of the lower discharging path 522 passes through a saddle discharging path 523 and is conveyed to the saddle bookbinding portion 800. The sheet is delivered to a pair of saddle inlet rollers 801, the conveyance entrance is selected by a switching member 802 operated by a solenoid according to the size, and the sheet is conveyed into a storage guide 803 of the saddle bookbinding portion 800. The conveyed sheet is further conveyed by a sliding roller 804 until the leading end of the sheet abuts a movable sheet positioning member 805. The pair of saddle inlet rollers 801 and the sliding roller 804 are driven by a motor M21 (see
A pair of folding rollers 810a and 810b constituting a folding portion is provided on the downstream side of the stapler 820, and a protruding member 830 is provided at a position facing the pair of folding rollers 810a and 810b. The protruding member 830 is set to a position retracted from the storage guide 803 as a home position. The protruding member 830 is protruded toward the stored sheet bundle by driving a motor M23 (see
The creased sheet bundle is discharged to a folded-bundle discharge tray 850 through a pair of first folding conveying rollers 811a and 811b, and a pair of second folding conveying rollers 812a and 812b constituting an additional folding portion (folded-part processing unit) 814. Pressure F2 and F3 sufficient for conveying and stopping the creased sheet bundle is also applied to the pair of first folding conveying rollers 811 and the pair of second folding conveying rollers (a pair of pressure rollers) 812. When the sheets are conveyed in the storage guide 803, a shutter 816 moves to a position where the leading end of the sheets does not abut the pair of folding rollers 810. When the sheet bundle is protruded by the protruding member 830, the shutter 816 moves in the direction parallel to the storage guide 803 to a position to make a path toward the pair of folding rollers 810. This movement operation is performed by driving a motor M26 (see
The pair of folding rollers 810, the pair of first folding conveying rollers 811, and the pair of second folding conveying rollers 812 rotate at the same speed by the same motor M24 (see
When the sheet bundle bound by the stapler 820 is folded, after the stapling process is finished, the sheet positioning member 805 is lowered by a predetermined distance from the position at the time of the staple process so that the staple position of the sheet bundle comes to the nip position of the pair of folding rollers 810. Thus, it is possible to fold the sheet bundle with the position where the staple process is performed as the center.
A pair of aligning plates 815 has a surface which encircles the outer circumferential surface of the pair of folding rollers 810a and 810b and projects to the storage guide 803 and, and aligns the sheets stored in the storage guide 803. The pair of aligning plates 815 moves by driving a motor M25 (see
As shown in
When the sheet bundle is thick and the folding is not enough, the created booklet St is to be a booklet in which a folded part Sa bulges as shown in
Next, the additional folding portion will be described. The additional folding portion 814 is provided at the downstream side in the sheet conveying direction of the pair of folding rollers 810a and 810b and the protruding member 830 constituting the folding portion, and is a folded-part processing unit which performs a process of pressing the folded part of the sheet bundle folded in half. In this embodiment, the additional folding portion 814 is incorporated in the finisher 100 as a part of the saddle bookbinding portion 800, but may be a separate unit disposed at the downstream side of the saddle stitch binding portion.
As shown in
As shown in
As shown in
On the other hand, when the number of sheets of the sheet bundle constituting the booklet is equal to or more than the predetermined number, but when the basis weight of the outermost sheet of the sheet bundle constituting the booklet is equal to or more than the predetermined basis weight, it is determined that the scoring is necessary and that the additional folding is not necessary. Thus, the scoring is performed to the sheets constituting the sheet bundle, but the additional folding is not performed to the half-folded sheet bundle constituting the booklet. Here, if both the scoring and the additional folding are performed, since the spine of the booklet is squared by the additional folding, the spine of the booklet has a score and a bad appearance. For this reason, the scoring is performed and the additional folding is not performed.
Furthermore, when the basis weight of the outermost sheet of the sheet bundle constituting the booklet is equal to or more than the predetermined basis weight and when the number of sheets of the sheet bundle constituting the booklet is equal to or more than the predetermined number, but when the number of sheets exceeds the preset number of sheets, it is determined that the scoring is not necessary and that the additional folding is necessary. Here, the preset number of sheets is the case where the number of inner sheets is ten. In this case, the scoring is not performed to the sheets constituting the sheet bundle, but the additional folding is performed to the half-folded sheet bundle constituting the booklet.
That is, in the determination table shown in
By determining whether the scoring processing and the additional folding processing are necessary according to the information on the sheet bundle and performing the processes as described above, it is possible for the sheet processing apparatus to create a booklet under appropriate book creating conditions according to the booklet to be created.
In the above embodiment, the embodiment, in which it is determined whether the scoring is necessary according to whether the basis weight of the outermost sheet of the sheet bundle is equal to or more than the predetermined basis weight, has been exemplified. However, regardless of the basis weight of the outermost sheet of the sheet bundle, the necessity of the scoring may be determined simply according to the number of sheets of the sheet bundle. In this case, for example, the scoring is performed when the number of sheets of the sheet bundle is less than the predetermined number of sheets, and the scoring is not performed when the number of sheets of the sheet bundle is equal to or more than the predetermined number of sheets. Since a crack can occur on the spine when the number of sheets of the sheet bundle is small, the scoring is performed to handle this. When the number of sheets of the sheet bundle is large (that is, the sheet bundle is thick), although the spine of the sheets bulges and cracks do not occur, the score can be noticeable, and the scoring is not performed to handle this.
In
Further, when the thickness of the sheet bundle constituting the booklet is less than a predetermined thickness, it is determined that the additional folding is not necessary, and the additional folding is not performed to the half-folded sheet bundle constituting the booklet. Here, the predetermined thickness of the sheet bundle is 1050 gsm. On the other hand, when the thickness of the sheet bundle constituting the booklet is equal to or more than the predetermined thickness, it is determined that the additional folding is necessary, and the additional folding is performed to the half-folded sheet bundle constituting the booklet.
When the basis weight of the outermost sheet of the sheet bundle constituting the booklet is equal to or more than the predetermined basis weight, but when the thickness of the sheet bundle constituting the booklet is equal to or more than the predetermined thickness, it is determined that the scoring is not necessary, and the scoring is not performed to the sheets constituting the sheet bundle.
That is, in
By determining whether the scoring processing and the additional folding processing are necessary according to the information on the sheet bundle and performing the processes as described above, it is also possible for the sheet processing apparatus to create a booklet under appropriate book creating conditions according to the booklet to be created.
The operation in a bookbinding mode will be describedwith reference to the flowchart of
The bookbinding mode is selected through the operation portion 601 (STEP 1), the size of the sheet, the basis weight of the outermost sheet, the basis weight of the inner sheet, and the number of the inner sheets are selected (STEP 2), and copying is started (STEP 3) to start print. According to the determination table for the scoring and the additional folding processes shown in
When it is determined that the scoring is not necessary in STEP 4 and that the additional folding is necessary in STEP 21, the scoring apparatus 200 does not perform the scoring process and the sheets are conveyed to the saddle bookbinding portion 800. The sheets are stored in the storage portion and subjected to the aligning process (STEP 22). When the final sheet is stored and aligned (STEP 23), the saddle binding process (STEP 24) and the folding process (STEP 25) are performed. Furthermore, the additional folding portion 814 performs the additional folding process (STEP 26), and a booklet having a flattened spine is created. When a sheet bundle is the final bundle (STEP 27), the job is completed (STEP 28).
When it is determined that the scoring is not necessary in STEP 4 and that the additional folding is not necessary in STEP 21, the scoring apparatus 200 does not perform the scoring process and the sheets are conveyed to the saddle bookbinding portion 800. The sheets are stored in the storage portion and subjected to the aligning process (STEP 31). When the final sheet is stored and aligned (STEP 32), the saddle binding process (STEP 33) and the folding process (STEP 34) are performed, and a booklet in which the scoring is not performed and a spine is not flattened. When a sheet bundle is the final bundle (STEP 35), the job is completed (STEP 36).
As described above, according to the present embodiment, by automatically performing processes necessary for the booklet according to the conditions of the booklet to be created, it is possible to save time and labor for an operator to make a sample to check necessary processes.
Note that, in STEPS 4 and 21, the determination table for the scoring and additional folding processes shown in
In the above embodiment described with reference to
In any of the embodiments described above, the sheet processing apparatus including the additional folding portion 814 has been exemplified. Needless to say, the present invention can be also applied to a sheet processing apparatus which does not include the additional folding portion 814. Although the embodiment in which the scoring apparatus 200 performs scoring to sheets (an outermost sheet and sheets other than the outermost sheet) constituting a sheet bundle (booklet) has been exemplified, the scoring may be performed only to the outermost sheet of the sheets constituting a sheet bundle (booklet).
In the above embodiments, a copying machine has been exemplified as the image forming apparatus, but the present invention is not limited thereto, and may be other image forming apparatuses such as a printer, a facsimile apparatus, and the like, or a complex machine and the like in which these functions are combined. Similar effects can be obtained by applying the present invention to a sheet processing apparatus connected to these image forming apparatuses or a sheet processing apparatus provided in these image forming apparatuses.
Furthermore, in the above embodiments, the sheet processing apparatus connected to the apparatus main body of the image forming apparatus has been exemplified, but the present invention is not limited thereto. For example, a sheet processing apparatus may be included integrally in an image forming apparatus, and similar effects can be obtained by applying the present invention to the sheet processing apparatus. Moreover, although the sheet processing apparatus including the scoring apparatus having the scoring unit separately from the finisher having the additional folding portion has been exemplified, the present invention is not limited thereto. A sheet processing apparatus may integrally include the scoring unit and the additional folding portion, and similar effects can be obtained by applying the present invention to the sheet processing apparatus.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefit of Japanese Patent Application No. 2016-138215, filed Jul. 13, 2016, which is hereby incorporated by reference herein in its entirety.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-138215 | Jul 2016 | JP | national |
