JP2020032614A - Bookbinding device - Google Patents

Abstract

To solve a problem that a durability of a booklet may be decreased, such as a page becoming easy to cut, if perforations are provided in a sheet when forming the booklet by folding a sheet bundle in half.SOLUTION: When automatic perforation is selected (S7; YES), a determination is made on whether or not the booklet is easy to open and whether or not a fear of a decrease in quality of the booklet is high (S9, S10), based on the number of sheets in the sheet bundle, a product of a basis weight, etc. The perforations are formed (S11) in the sheet only when the fear of the decrease in quality is high (YES) based on the above product, etc.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a bookbinding apparatus for folding a sheet bundle into two to form a booklet.

  In general, there is a bookbinding apparatus that pushes a central portion of a sheet bundle by a pushing unit, holds the sheet bundle in a pressure roller nip, and folds the sheet bundle into two. Normally, a booklet created by such a bookbinding apparatus has a finish with a curved portion near the back, and the booklet tends to open and has an unattractive appearance. In particular, when a large number of sheet bundles, a sheet bundle with high rigidity, such as a sheet bundle made of thick paper, and a sheet bundle with high rigidity, a paper with moisture removed in a low humidity environment, or a case in which the paper is folded in a direction perpendicular to the paper gap. , The tendency to open booklets becomes remarkable.

  Conventionally, a perforation forming unit that conveys a sheet while performing processing for facilitating folding of a sheet is provided, a plurality of the processed sheets are combined, and the processed portion is stapled with a staple. There has been proposed a paper binding apparatus that folds a sheet bundle by applying a bending tool along a portion where the sheet bundle has been processed (see Patent Document 1).

JP 2012-66899 A

  The sheet binding apparatus forms a perforation while the sheet is being conveyed so that the perforation forming means is parallel to the sheet conveying direction, and the sheet rotating device rotates the sheet by 90 degrees, aligns the sheet, and forms the perforation. Staple the part. The perforation forming means can form a disc-shaped member that forms a perforation so as to be able to freely contact and separate from a sheet, and can form a perforation only on a specific sheet. This is to make the perforations in the booklet inconspicuous, such as forming a perforation other than the last page, and to cope with the difficulty of folding the sheet bundle and the durability of the booklet It does not do.

  Therefore, even if the sheet bundle is easy to bend, there is a tendency that most sheets are perforated, and the pages are easily cut along the perforations from the end of the booklet, thereby reducing the durability of the booklet. There was. Also, even if the holes were not cut off, if the perforations came to the ends, the ribs stood up and the appearance was not good.

  Therefore, an object of the present invention is to provide a bookbinding apparatus in which the tendency of a created booklet to be opened is improved, and unnecessary quality reduction is reduced by preventing unnecessary perforation. is there.

The present invention
Conveying means for conveying the sheet, perforation forming means for perforating the folding position of the sheet, sheet bundle forming means for forming the sheet bundle by superimposing the sheets, sheet bundle folding means for folding the sheet bundle, Acquiring means for acquiring the number of sheet bundles and the basis weight of the sheets of the sheet bundle; and selecting operation or non-operation of the perforation forming means based on at least one of the number of sheet bundles and the basis weight. And control means for performing the operation.

  Preferably, the control unit is configured such that, when the number of sheets forming the sheet bundle is equal to or more than a predetermined number, when the basis weight of the sheets forming the sheet bundle is equal to or more than a predetermined value, or when the sheet forming the sheet bundle is used. When the product of the number of sheets and the basis weight of the sheet is equal to or greater than a predetermined value, the perforation is formed on the sheet by the perforation forming means.

  According to the present invention, perforations are not formed on the sheet by the perforation forming means when the number of sheets is small, or the sheet has a small basis weight and a low stiffness, etc., and it is easy to fold and there is little possibility of deterioration in quality as a booklet. In addition, it is possible to reduce the durability of the booklet, such as the page is easily cut off, and to reduce the quality of the booklet as the booklet is easy to open, if the perforations are formed on the sheets forming the sheet bundle. Thus, the sheet bundle can be folded exactly and surely into two to prevent the quality of the booklet from deteriorating.

FIG. 1 is a schematic front sectional view showing the entire image forming apparatus to which the present invention is applied. FIG. 2A is a schematic front view illustrating a state where a sheet is introduced in a sheet processing apparatus (bookbinding apparatus). FIG. 2B is a schematic front view illustrating a state in which perforations are formed in the sheet in the sheet processing apparatus. FIG. 2A is a schematic front view illustrating a state in which sheets are bundled in the sheet processing apparatus. FIG. 2B is a schematic front view illustrating a state in which the sheet is moved to a folding position in the sheet processing apparatus. FIG. 2A is a schematic front view illustrating a state in which a sheet bundle in the sheet processing apparatus is folded into two. FIG. 2B is a schematic front view illustrating a state in which the folded booklet is transported in the sheet processing apparatus. FIG. 2 is a control block diagram of the image forming apparatus. FIG. 2 is a plan view showing a perforation forming apparatus in the sheet processing apparatus as viewed from the direction of arrow A in FIG. 1. FIG. 1 is a flowchart showing an embodiment of the present invention. FIG. 9 is a flowchart showing another embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an image forming apparatus provided with a sheet processing apparatus according to the present invention. The image forming apparatus U includes an image forming apparatus main body (copier main body 1) and a sheet processing apparatus 2 constituting a bookbinding apparatus.

  An image forming apparatus main body (copier main body) 1 includes a platen glass 21 serving as a document mounting table, a light source B, a lens system 22, a paper feed unit 11, an image forming unit 12, and a document feed for feeding a document to the platen glass 21. The apparatus 23 includes a discharge roller pair 17 that discharges an image-formed sheet discharged from the main body of the copying machine toward the sheet processing apparatus 2.

  The paper supply unit 11 includes cassettes 11 a to 11 d that store recording sheets and are detachable from the image forming apparatus main body 1. The image forming section 12 includes a cylindrical photosensitive drum 24 and a developing device 25 around the photosensitive drum 24. On the downstream side of the image forming section 12, a fixing device 13, a discharge roller pair 14, and the like are provided.

  When a paper feed signal is output from the image forming apparatus main body 1, sheets are fed from the cassettes 11 a to 11 d of the paper feed unit 11. On the other hand, light reflected from the light source B on the document placed on the document placing table 21 is irradiated to the photosensitive drum 24 via the lens system 22. The document table 21 has a document number detecting means N for detecting the number of documents and a document size detecting means for detecting the size of the document. The photosensitive drum 24 is charged by a primary charger in advance, and an electrostatic latent image is formed by irradiating light, and then the electrostatic latent image is developed by a developing device 25 to form a toner image.

  The skew of the sheet fed from the sheet feeding unit 11 is corrected by the registration roller 26, and the sheet is sent to the image forming unit 12 at an appropriate timing to form an image. Then, on the sheet on which the image is formed, the transfer image is permanently fixed on the sheet by the fixing device 13. The sheet on which the image has been fixed is discharged from the image forming apparatus main body 1 by the discharge roller pair 17. In some cases, the sheet is sent to the pair of reverse conveying rollers 20 by the flapper 18, and after being inverted, is discharged from the image forming apparatus main body 1 by the pair of discharge rollers 17.

  In this way, an image is formed on the sheet fed from the sheet feeding unit 11 and is discharged to the sheet processing apparatus (bookbinding apparatus) 2 according to the present invention.

  The sheet processing apparatus 2 has a series of guides 30 through which an image-formed sheet from the image forming apparatus main body 1 is conveyed, and along the guides 30 from the upstream side, a perforation forming apparatus (perforation forming). Means) 55, a sheet bundle forming device (sheet bundle forming device) 41, a stapler (binding device) 42, a sheet bundle folding device (sheet bundle folding device) 70, and a stopper 44 whose position can be changed depending on the sheet size. . Also, a tray 71 branched from the guide 30 to discharge sheets one by one, a tray 73 to discharge a sheet bundle formed by the sheet bundle forming device 72, and a booklet formed by the sheet bundle folding device 70 The tray 49 from which is discharged is arranged.

  The sheet S discharged from the image forming apparatus main body 1 is transported into the sheet processing apparatus 2 by the transport rollers 31 to 38. Then, as shown in FIG. 2A, when the sensor 50 detects the leading end of the sheet S in the transport direction, the nipping transport roller 38 decelerates and stops at the nip of the skew correction roller 51 which is stopped. Hit the end of the sheet. The transport roller 38 further transports the sheet S by a predetermined amount, and stops in a state where the sheet S forms a loop in the loop space 52. Thereafter, the skew of the sheet S is corrected by rotating the skew correction roller 51 to pinch and convey the sheet S. Then, as shown in FIG. 2B, the sensor 53 detects the leading edge of the sheet S in the transport direction and stops at a position where the sheet S has been transported by a predetermined amount. After the sheet S is perforated by the perforation forming device 55 at the stopped position, the sheet S is positioned by the stopper 44 such that the center of the sheet S comes to the binding position of the stapler 42. The operation of the perforation forming device 55 will be described later.

  As shown in FIG. 3A, the sequentially conveyed sheets are positioned by stoppers 44, aligned by a sheet bundle forming device 41 in a direction perpendicular to the conveying direction by an alignment plate, and are bundled inside the conveying path. 101 is formed. At this time, the sheets that are to be conveyed in order from the inside of the booklet and are finally stacked as the cover sheets of the booklet come to the folding rollers 45 and 46 side. Then, the sheet bundle 101 is stapled at the center portion of the sheet bundle by the stapler 42 (it may not be stapled in some cases). Next, as shown in FIG. 3B, the stopper 44 moves so that the central portion (the position where the staple binding) of the sheet bundle 101 comes to the position of the pushing plate 43 of the sheet bundle folding device 70. Then, as shown in FIG. 4A, the sheet bundle 101 is formed into a loop by being pierced at the center by the pushing plate 43, and is folded into two by the nip of the folding rollers 45 and 46, and is pressed. Is done. Thereafter, as shown in FIG. 4B, the booklet composed of the folded sheet bundle 101 is transported by bundle transport rollers 47 and 48 and is discharged onto a discharge tray 49.

  Next, the configuration of a control device 950 that controls the entire apparatus will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of the control device 950 in FIG.

  As shown in FIG. 5, the control device 950 includes a CPU circuit unit 905. The CPU circuit unit 905 includes a CPU (not shown), a ROM 906, and a RAM 907. The control unit 901 generally controls the feeding device control unit 901, the image reader control unit 902, the image signal control unit 903, the printer control unit 904, the operation unit 15, and the sheet processing device control unit 501. The RAM 907 temporarily stores control data and is used as a work area for arithmetic processing associated with control. The document feeder control unit 901 controls the driving of the automatic document feeder 23 based on an instruction from the CPU circuit unit 905. At this time, the number of documents is detected by the document number detection means N, and the document size detection means M The document size is detected. The image reader control unit 902 performs drive control on the light source, the lens system 22 and the like, and transfers the RGB analog image signals output from the lens system 22 to the image signal control unit 903.

  The image signal control unit 903 converts each of the RGB analog image signals from the lens system 22 into a digital signal, performs each process, converts the digital signal into a video signal, and outputs the video signal to the printer control unit 904. The processing operation of the image signal control unit 903 is controlled by the CPU circuit unit 905.

The operation unit 15 includes a plurality of keys such as a touch panel for setting various functions related to image formation, a display unit for displaying information indicating a setting state, and the like. Output to the display unit 905 and display the corresponding information on the display unit based on the signal from the CPU circuit unit 905. The operation unit 15 has an operation unit for setting a bookbinding 15a and a sheet basis weight 15b. The bookbinding 15a sets various binding specifications such as binding assignment, no binding, cover printing, and no binding. For the sheet basis weight 15b, the basis weight [g / m ² ] of the sheet on which an image is formed may be directly input using a numeric keypad or the like, or the sheet type may be selected to correspond to the basis weight. Note that the sheet basis weight is not limited to the setting by the user using the operation unit 15b described above, and may be detected by a sensor by detecting the light transmission amount of the sheet. The operation unit 15 has a perforation operation unit 15c. The perforation operation unit 15c selects whether or not to form a perforation on the sheet. Whether or not to do so can be set.

  The sheet processing apparatus control unit 501 is mounted on the sheet processing apparatus 2 and controls driving of the entire sheet processing apparatus by exchanging information with the CPU circuit unit 905 via a communication IC (IPC) (not shown). The sheet processing apparatus control unit 501 includes a CPU 601, a ROM 602, and a RAM 603, and various actuators and sensors such as a conveyance roller driving motor, a skew correction roller driving motor, and a perforation forming apparatus driving motor 65 according to a control program stored in the ROM 906. Various sensors such as 50 and 53 are controlled. The RAM 603 temporarily stores control data and is used as a work area for arithmetic processing accompanying control, and temporarily stores values such as the position of a sheet with respect to the perforation forming apparatus 55 and the order of sheets in a sheet bundle. .

  The CPU circuit unit 905 determines the number of sheets of the sheet bundle to be a booklet based on the number of originals by the number of originals detecting unit N and the setting of the bookbinding operation unit 15a, and based on a signal from the sheet basis weight operation unit 15b. The amount is recognized, and the signal is exchanged with the sheet processing apparatus control unit 501.

  FIG. 6 is a plan view of the perforation forming device 55 as viewed from the direction of arrow A in FIG. The perforation forming device 55 has a disk 59 having a perforation blade for forming a perforation on the outer periphery, and the disk 59 is attached to the arm 57 so as to be rotatable about a support shaft 61. . The arm 57 is attached to the slide base 56 so as to be rotatable about a support shaft 58. The arm 57 is pressed around the support shaft 58 so that the perforation blade of the disk 59 is pressed by the perforation table 54 (see FIG. 1) by the tension spring 60. The slide base 56 is slidably supported along slide shafts 67a and 67b. The slide shafts 67a, 67b are fixed to the side plates 69a, 69b of the sheet processing apparatus 2 by mounting tables 68a, 68b. The slide table 56 is fixed to a drive belt 63 by a mounting member 62. The drive belt 63 is wound around the drive pulley 64 of the idler pulley 66 and driven by the drive motor 65, and the perforation blade of the disk 59 is pressed against the perforation table 54 before the sheet processing apparatus 2. It is configured to be able to slide back and forth to the side and the back side.

  Next, characteristic control according to the present invention will be described with reference to the flowchart in FIG. FIG. 7 shows an embodiment of the present invention.

  The user inputs the basis weight (S2) of the sheet to be used and the size (S3) of the booklet. Further, as described above, the number of sheets in the sheet bundle is recognized based on the number of documents and bookbinding specifications (S1). For example, when making a double-sided A4-size booklet from 20 A4-size single-sided originals, a total of six sheet bundles consisting of five A3-size print sheets, one cover sheet, and a back cover are provided. The number is 12 sheets.

  Then, printing is performed on the sheet by the image forming apparatus main body 1 (S4). At this time, as described above, the perforation operation unit 15c automatically determines whether or not to form perforations on the sheet. Whether or not to select an auto forming eye is set, and whether or not the sheet bundle is folded in two is also set in advance by the perforation operation unit 15c. In step S5, it is determined whether or not folding is selected. If not, the sheet is discharged as it is (S13). When the folding is selected (S5; YES), the process proceeds to step S6. In step S6, it is determined whether or not to form a perforation in the perforation operation unit 15c, and when it is selected not to form the perforation, a folding operation is performed (S12). The sheet bundle is folded in two without perforations. If perforation is selected (S6; YES), it is determined whether or not perforation auto is selected (S7).

  If auto is selected in step S7 (YES), it is determined whether the booklet is easy to open and the quality of the booklet is degraded based on the product of the number of sheets in the sheet bundle and the basis weight of the sheet. First, in step S8, it is determined whether or not the sheet size of the sheet bundle is equal to or larger than a predetermined value. Specifically, it is determined whether or not the sheet size is A3 or larger. If the sheet size is A3 or larger (S8; YES), it is determined whether or not the product of the number of sheet bundles and the grammage is 600 or more (S9). If the size is smaller than A3 (S8; NO), it is determined whether the product of the number of sheets and the grammage is 700 or more (S10). Here, the numerical value of the product was changed according to the size of the sheet size.This is because the characteristic that the booklet of the small size sheet is easy to open was taken into consideration, and regardless of the sheet size, whether or not the product is equal to or larger than a predetermined value is determined. You may judge by.

If it is 600 or more in step S9 (YES), or if it is 700 or more in step S10 (YES), the perforation forming apparatus driving motor 65 is driven to form perforations on the sheet (S11). That is, if the product is equal to or greater than a predetermined value, the booklet is easy to open, and the quality of the booklet is likely to be degraded. Improve the quality of. In addition to the case of YES in steps S9 and S10, the case where auto is not selected in step S7 (NO) is led to step S11, and the perforation of the sheet by the perforation forming device 55 is performed. Then, after the perforation is performed in step S11, or when the value is less than 600 in step S9 or less than 700 in step S10 (NO), both are guided to step S12, and the sheet bundle folding device 70 folds the sheet bundle into two. Is executed (S12), and the sheet is guided to discharge (S13), and the job ends. That is, when the above product is equal to or less than the predetermined value, the booklet is difficult to open, and the durability and appearance of the booklet due to the perforations are more apparent than the deterioration of the quality of the booklet. Therefore, the sheet bundle is folded without perforating the sheet. As an example, when making a booklet with an A3 size sheet bundle, when making a book bundle (22 booklets) with 11 or more sheet bundles using a sheet having a basis weight of 68 g / m ² , the sheets are perforated.

  That is, the sheet (S9, S10; YES) on which the perforation is formed by the perforation forming device 55 or the sheet (S9, S10; NO) on which the perforation is not formed is sent to the sheet bundle forming device 41 as described above. The sheets are aligned to form a sheet bundle. Next, the sheet bundle is stapled at the center of the sheet bundle by the stapler 42, and further the sheet bundle is folded in two by the sheet bundle folding device 70, and discharged as a booklet onto the discharge tray 49.

  Next, a partially modified embodiment will be described with reference to FIG. Steps with the same step numbers as in FIG. 7 are the same as those in the previous embodiment, and therefore, the present embodiment will be described focusing on different steps. In step S9, when the sheet size is A3 or more and the product of the number of sheet bundles and the sheet basis weight is 600 or more (YES), or in step S10, the sheet size is less than A3 and the product is 700 In the above case (YES), the process is led to step S15. If the high quality mode is selected in step S15 (YES), only a part of the sheet bundle is perforated (S17). If the high quality mode is not selected (NO), the sheet bundle is Are perforated on all the sheets (S16).

  The high quality mode in which a part of the sheet bundle is perforated is performed by perforating only the sheets whose product of the number of sheets and the basis weight exceeds the above 600 or 700, or when folding the sheet bundle in half. Each of the modes is set in advance, for example, to perforate sheets other than 10%, or to perforate sheets other than the 10% sheets from the inside and outside. The setting of each high-quality mode may be selected by the user on the bookbinding operation unit 15a, or may be set according to the image forming apparatus. By perforating only the sheet exceeding the above product, it is possible to maintain the durability of the booklet and prevent the booklet quality from being deteriorated due to easy opening of the booklet. By not perforating the inner and outer sheets that are easily visible to the user, the quality of the booklet can be improved, the booklet can be hardly broken, and the inner sheet is not perforated. Thus, it is possible to prevent a decrease in binding strength due to a staple when binding with staples.

  In the above-described embodiment, whether or not to form a perforation on a sheet is determined based on the product of the number of sheets in the sheet bundle and the sheet basis weight. This is based on at least one of the number of sheets and the sheet basis weight. May be. That is, when the number of sheets in the sheet bundle is equal to or more than a predetermined number and / or when the basis weight of the sheets is equal to or more than a predetermined value, perforations may be formed in the sheets. Also, perforations were formed on the sheets except for a predetermined percentage [%] of the sheet bundle inside and / or outside the booklet, but the number of sheets may be a predetermined number, and in short, a predetermined amount of sheets is excluded. Perforations may be formed in the sheet.

2 Bookbinding equipment (sheet processing equipment)
30, 31-39 Conveying means (guide, conveying roller)
55 Perforation forming means (device)
41 sheet bundle forming means (apparatus)
70 Sheet bundle folding means (device)
950 Control means (device)

Claims (7)

Conveying means for conveying the sheet,
Perforation forming means for perforating the bending position of the sheet;
Sheet bundle forming means for superimposing sheets to form a sheet bundle;
Sheet bundle folding means for folding the sheet bundle;
Acquisition means for acquiring the number of sheets of the sheet bundle and the basis weight of the sheets of the sheet bundle,
Control means for selecting operation / non-operation of the perforation forming means based on at least one of the number of sheets and the basis weight;
A bookbinding device comprising:   2. The bookbinding apparatus according to claim 1, wherein when the number of sheets in the sheet bundle is equal to or greater than a predetermined value, the control unit executes perforation on the sheet by the perforation forming unit. 3.   3. The controller according to claim 1, wherein when the basis weight of the sheet forming the sheet bundle is equal to or greater than a predetermined value, the controller executes the perforation on the sheet by the perforation forming unit. 4. Bookbinding equipment.   When the product of the number of sheets forming the sheet bundle and the basis weight of the sheet is equal to or greater than a predetermined value, the control unit executes perforation on the sheet by the perforation forming unit. The bookbinding device according to claim 1.   The method according to claim 4, wherein when the product of the number of sheets and the basis weight of the sheet is equal to or greater than a predetermined value, the control unit forms the perforation only on the sheets equal to or greater than the predetermined value. The bookbinding device as described.   When the product of the number of sheets and the basis weight of the sheets is equal to or greater than a predetermined value, the control unit may determine whether the product is formed by bending the sheet bundle from inside or outside the booklet or from both inside and outside the booklet. The bookbinding apparatus according to claim 4, wherein the perforations are formed in a portion of the sheet excluding a fixed amount of sheets. A stapling unit for stapling a place where a perforation of the sheet bundle formed by the sheet bundle forming unit is formed,
The bookbinding apparatus according to claim 1, wherein the sheet bundle folding unit folds the sheet bundle bound by the binding unit by pressing the sheet bundle while bending the sheet bundle.

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