MEDIUM PROCESSING APPARATUS AND IMAGE FORMING SYSTEM INCORPORATING SAME

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is based on and claims priority pursuant to 35 U.S.C. § 119(a) to Japanese Patent Application Nos. 2023-046990, filed on Mar. 23, 2023, and 2024-017972, filed on Feb. 8, 2024, in the Japan Patent Office, the entire disclosure of each of which is hereby incorporated by reference herein.

BACKGROUND
Technical Field

Embodiments of the present disclosure relate to a medium processing apparatus and an image forming system incorporating the medium processing apparatus.

Background Art

Various types of medium processing apparatuses in the art are known that bind a sheet bundle of overlaid sheet media. Such medium processing apparatuses are known that employ binding processes including a “crimping binding process” for applying pressure to and deform a part of a sheet bundle to bind the sheet bundle. In addition, a medium processing apparatus is also known that increases binding strength by applying liquid in advance to a position at which a sheet bundle is deformed by pressure.

Such a medium processing apparatus crimps and binds the portion to which liquid is applied in advance to increase the strength of the binding portion. The medium processing apparatus includes a liquid adding unit to add liquid to a sheet, a liquid supplier to store liquid to be supplied to the liquid adding unit, and an adjuster to adjust the amount of liquid to be supplied to the liquid adding unit, so that the amount of liquid to be supplied to the liquid adding unit is adjusted by a shutter disposed in the adjuster depending on the type of the sheet.

SUMMARY

Embodiments of the present disclosure described herein provide a novel medium processing apparatus includes the liquid applier, a first liquid storage, a second liquid storage, a liquid flow passage, a liquid leakage detector, and a liquid flow limiter. The liquid applier applies a liquid on a sheet on which a given process is to be performed liquid. The first liquid storage stores liquid to be supplied by the liquid applier. The second liquid storage stores the liquid to be supplied to the first liquid storage. The liquid flow passage connects the first liquid storage and the second liquid storage. The liquid leakage detector detects leakage of the liquid from at least one of the first liquid storage or the second liquid storage. The liquid flow limiter limits a flow of the liquid from at least one of the first liquid storage or the second liquid storage in response to a detection of the leakage by the liquid leakage detector.

Further, embodiments of the present disclosure described herein provide an image forming system including an image forming apparatus and the above-described medium processing apparatus. The image forming apparatus forms an image on a medium. The medium processing apparatus performs the given process on a bundle of media including the medium on which the image is formed by the image forming apparatus.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Exemplary embodiments of this disclosure will be described in detail based on the following figures, wherein:

FIG. 1 is a diagram illustrating the overall configuration of an image forming system according to an embodiment of the present disclosure;

FIG. 2 is a diagram illustrating an internal configuration of a post-processing apparatus according to a first embodiment of the present disclosure;

FIG. 3 is a schematic diagram illustrating a configuration of an edge binder according to an embodiment of the present disclosure, viewed from an upstream side in a conveyance direction;

FIG. 4 is a schematic diagram illustrating a configuration of a liquid applier of the edge binder of FIG. 3 in a main scanning direction;

FIGS. 5A and 5B are schematic diagrams each illustrating a configuration of a crimper according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating a staple binder, viewed from an upstream side of the staple binder in the conveyance direction;

FIG. 7 is a diagram of a schematic configuration of a staple binder according to a modification of the above embodiments of the present disclosure, viewed from an upstream side of the staple binder in the conveyance direction;

FIG. 8 is a block diagram illustrating a hardware configuration of the post-processing apparatus according to the first embodiment, to control the operation of the post-processing apparatus;

FIG. 9 is a flowchart of a binding process according to an embodiment of the present disclosure;

FIGS. 10A, 10B, and 10C are diagrams each illustrating the positions of the liquid applier and the crimper during a binding process;

FIGS. 11A and 11B are diagrams each illustrating the location and configuration of a second liquid storage in the post-processing apparatus according to an embodiment of the present disclosure;

FIG. 12 is a diagram including FIGS. 12A, 12B, and 12C illustrating supplying liquid to the second liquid storage in the post-processing apparatus according to an embodiment of the present disclosure;

FIG. 13 is a diagram illustrating a schematic configuration of a liquid replenishment assembly disposed in the edge binder according to an embodiment of the present disclosure;

FIG. 14 is a diagram illustrating the liquid replenishment assembly disposed in the edge binder according to an embodiment of the present disclosure, when the liquid replenishment assembly is during an operation;

FIG. 15 is a diagram illustrating the liquid replenishment assembly disposed in the edge binder according to an embodiment of the present disclosure, when the liquid replenishment assembly is during yet another operation;

FIG. 16 is a diagram illustrating the liquid replenishment assembly disposed in the edge binder according to an embodiment of the present disclosure, when the liquid replenishment assembly is during yet another operation;

FIG. 17 is a flowchart of a liquid leakage detection control process according to the present embodiment;

FIG. 18 is a diagram illustrating the liquid replenishment assembly during the liquid leakage detection control process according to the present embodiment;

FIG. 19 is a flowchart of a first restriction process according to the present embodiment;

FIG. 20 is a diagram illustrating the liquid replenishment assembly during the first restriction process according to the present embodiment;

FIG. 21 is a flowchart of a second restriction process according to the present embodiment;

FIG. 22 is a diagram illustrating the liquid replenishment assembly during the second restriction process according to the present embodiment;

FIG. 23 is a flowchart of a third restriction process according to the present embodiment;

FIG. 24 is a diagram illustrating the liquid replenishment assembly during the third restriction process according to the present embodiment;

FIGS. 25A and 25B are diagrams each illustrating a liquid leakage sensor according to the present embodiment;

FIGS. 26A and 26B are diagrams each illustrating yet another liquid leakage sensor according to the present embodiment;

FIGS. 27A and 27B are diagrams each illustrating yet another liquid leakage sensor according to the present embodiment;

FIG. 28 is a diagram illustrating an internal configuration of a post-processing apparatus according to a second embodiment of the present disclosure;

FIGS. 29A, 29B, and 29C are views of an internal tray of the post-processing apparatus according to the second embodiment, in a thickness direction of a sheet;

FIG. 30 is a schematic diagram illustrating a crimper of the post-processing apparatus according to the second embodiment, viewed from a downstream side in a conveyance direction of the sheet;

FIGS. 31A and 31B are schematic views of a liquid applier of the post-processing apparatus according to the second embodiment, viewed from the thickness direction of the sheet;

FIGS. 32A, 32B, and 32C are cross-sectional views of the liquid applier taken along a line XXV-XXV of FIG. 31A;

FIGS. 33A, 33B, and 33C are cross-sectional views of the liquid applier taken along a line XXVI-XXVI of FIG. 31A;

FIG. 34 is a control block diagram illustrating a hardware configuration of the post-processing apparatus according to the second embodiment;

FIG. 35 is a flowchart of post-processing performed by the post-processing apparatus according to the second embodiment;

FIG. 36 is a diagram illustrating the overall configuration of an image forming system according to a modification of the embodiment illustrated in FIG. 1;

FIGS. 37A and 37B are diagrams each illustrating a post-processing apparatus including controllers as a first modification of the present embodiment; and

FIGS. 38A and 38B are diagrams each illustrating a post-processing apparatus including controllers as a second modification of the present embodiment.

The accompanying drawings are intended to depict embodiments of the present disclosure and should not be interpreted to limit the scope thereof. The accompanying drawings are not to be considered as drawn to scale unless explicitly noted.

DETAILED DESCRIPTION

It will be understood that if an element or layer is referred to as being “on,” “against,” “connected to” or “coupled to” another element or layer, then it can be directly on, against, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, if an element is referred to as being “directly on,” “directly connected to” or “directly coupled to” another element or layer, then there are no intervening elements or layers present. As used herein, the term “connected/coupled” includes both direct connections and connections in which there are one or more intermediate connecting elements. Like numbers refer to like elements throughout. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements describes as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, term such as “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors herein interpreted accordingly.

The terminology used herein is for describing particular embodiments and examples and is not intended to be limiting of exemplary embodiments of this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “includes” and/or “including,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Referring now to the drawings, embodiments of the present disclosure are described below. In the drawings for explaining the following embodiments, the same reference codes are allocated to elements (members or components) having the same function or shape and redundant descriptions thereof are omitted below.

A description is given of an image forming system according to an embodiment of the present disclosure, with reference to the drawings.

FIG. 1 is a diagram illustrating an overall configuration of the image forming system 1.

The image forming system 1 has a function of forming an image on a sheet P as a sheet medium and a function of performing a post-processing operation on the sheet P as a process after the image is formed on the sheet P. As illustrated in FIG. 1, the image forming system 1 includes an image forming apparatus 2 including the image forming function and a post-processing apparatus 3 serving as a medium processing apparatus including the post-processing function, according to an embodiment of the present disclosure. In the image forming system 1, the image forming apparatus 2 and the post-processing apparatus 3 operate in conjunction with each other.

In the present embodiment, the sheet-like medium to be processed in the image forming system 1 is described on the assumption that the medium is a sheet of “paper”. The object to be processed according to the present embodiment is not limited to a paper. For example, any material or specification may be used as long as an image can be formed on a medium in a known image forming process and the medium is a target of the image forming process. The medium includes a medium which can be an object of the folding process or the binding process, and the material or the specification is not limited.

The image forming apparatus 2 forms an image on the sheet P and ejects the sheet P having the image to the post-processing apparatus 3. The image forming apparatus 2 includes a sheet tray 211 that accommodates the sheet P, a conveyor 212 that conveys the sheet P accommodated in the sheet tray 211, and an image former 213 that forms an image on the sheet P conveyed by the conveyor 212. The image former 213 may be an inkjet system that forms an image using inkjet system or an electrophotographic system that forms an image using toner. The image forming apparatus 2 also includes a controller 100a that controls various operations of the conveyor 212 and the image former 213. Since the image forming apparatus 2 has a typical configuration, a detailed description of the configuration and functions of the image forming apparatus 2 are omitted.

Sheets of paper are widely known as an example of sheet-shaped media. Further, in the following description, a sheet-shaped medium as a medium to be processed is referred to as a “sheet P.” Further, in the following description, a bundle of sheets of paper as a plurality of media is an example of a “sheet bundle Pb.”

A description is given of the post-processing apparatus 3 according to a first embodiment of the present disclosure.

FIG. 2 is a diagram illustrating an internal configuration of the post-processing apparatus 3 according to the first embodiment of the present disclosure.

The post-processing apparatus 3 has a function that performs given post-processing on the sheet P on which an image is formed by the image forming apparatus 2.

An example of the post-processing according to the present embodiment is a binding process as a “crimping process” that binds, without staples, a plurality of sheets P on each of which an image is formed as a bundle of sheets, which may be referred to as a sheet bundle. Another example of the post-processing according to the present embodiment is a binding process as a “stapling process” that binds, with staples, a plurality of the sheets P on each of which an image is formed as a bundle of sheets (i.e., sheet bundle). In the following description, the bundle of sheets may be referred to as a “sheet bundle Pb” as a bundle of media.

In the present embodiment, a description is typically given of liquid application in a crimp binding process. However, the liquid application related to a stapling process is similar to the liquid application in the crimp binding process. In the following description, the term “binding process” indicates both the “crimp binding process” and the “stapling process”, and is not limited to a binding method (whether a binding needle is used or a pressing and deforming process is performed).

More specifically, the “crimp binding process” according to the present embodiment is a process called “crimp binding” to apply pressure to the binding position corresponding to a part of the sheet bundle Pb to deform (perform pressure deformation on) the binding position and bind the sheet bundle Pb. The binding that can be executed by the post-processing apparatus 3 includes edge binding and saddle binding. The edge binding is a process to bind an end (including an edge) of the sheet bundle Pb. The saddle binding is a process to bind the center of the sheet bundle Pb.

The post-processing apparatus 3 includes the conveyance roller pairs 10 to 19, each functioning as a conveyor, the switching member 20, and a controller 100b serving as a controller. The controller 100b controls the operations of, for example, the conveyance roller pairs 10 to 19 (conveyors), and the switching member 20. Details of the controller 100b will be described below. The conveyance roller pairs 10 to 19 convey, inside the post-processing apparatus 3, the sheet P supplied from the image forming apparatus 2. More specifically, the conveyance roller pairs 10 to 13 convey the sheet P along a first conveyance passage Ph1. The conveyance roller pairs 14 and 15 convey the sheet P along a second conveyance passage Ph2. The conveyance roller pairs 16 to 19 convey the sheet P along a third conveyance passage Ph3. A hole punch 132 is disposed between the conveyance roller pairs 10 and 11. The hole punch 132 performs punching on a sheet P conveyed by the conveyance roller pairs 10 and 11.

The first conveyance passage Ph1 is a passage extending to an ejection tray 21 from a supply port through which the sheet P is supplied from the image forming apparatus 2. The second conveyance passage Ph2 is a passage branching from the first conveyance passage Ph1 between the conveyance roller pairs 11 and 14 in a conveyance direction and extending to an ejection tray 26 via an internal tray 22. The third conveyance passage Ph3 is a passage that branches off from the first conveyance passage Ph1 between the conveyance roller pairs 11 and 14 in the sheet conveyance direction and reaches to an ejection tray 30.

The switching member 20 serving as a switcher is disposed at a branching position of the first conveyance passage Ph1 and the second conveyance passage Ph2.

Each of the switching member 20 can change the position between a first position and a second position. The switching member 20 at the first position guides the sheet P to be ejected to the ejection tray 21 through the first conveyance passage Ph1. The switching members 20 at the second position guides the sheet P conveyed through the first conveyance passage Ph1 to the second conveyance passage Ph2. When a trailing end of the sheet P entering the second conveyance passage Ph2 passes through the conveyance roller pair 11, the conveyance roller pair 14 is rotated in reverse to guide the sheet P to the third conveyance passage Ph3. The post-processing apparatus 3 further includes multiple sensors that detects the positions of the sheet P in the first conveyance passage Ph1, the second conveyance passage Ph2, and the third conveyance passage Ph3. Each of the multiple sensors is indicated by a black triangle.

The post-processing apparatus 3 further includes the ejection tray 21. The sheet P that is output through the first conveyance passage Ph is placed on the ejection tray 21. Among the sheets P supplied from the image forming apparatus 2, a sheet P not subjected to the binding process is ejected to the ejection tray 21.

The post-processing apparatus 3 further includes the internal tray 22 serving as a receptacle, an end fence 23, side fences 24L and 24R, an edge binder 25, a staple binder 155, and the ejection tray 26. The internal tray 22, the end fence 23, the side fences 24L and 24R, the edge binder 25, and the staple binder 155 perform the edge binding on the sheet bundle Pb of a plurality of sheets P conveyed to the internal tray 22 from the second conveyance passage Ph2. Among the sheets P supplied from the image forming apparatus 2, the sheet bundle Pb subjected to the edge binding is ejected to the ejection tray 26.

The “edge binding process” includes “parallel binding process,” “oblique binding process,” and “vertical binding process.” The “parallel binding process” is a process of binding the sheet bundle Pb along one side of the sheet bundle Pb parallel to the main scanning direction. The “oblique binding process” is a process of binding a corner of the sheet bundle Pb. The “vertical binding process” is a process of binding the sheet bundle Pb along one side of the sheet bundle Pb parallel to the conveyance direction.

In the following description, a direction in which the sheet P is conveyed from the conveyance roller pair 15 toward the end fence 23 is defined as a “conveyance direction.” In other words, the “conveyance direction” herein corresponds to a direction in which the sheet P that has been output from the image forming apparatus 2 is moved toward the ejection tray 26 by, for example, the conveyance roller pair 10, is changed to move toward the end fence 23 by the conveyance roller pair 15 in a direction different from the above-described direction. The direction that is orthogonal to the conveyance direction and a thickness direction of the sheet P is defined as a “main scanning direction” or a “width direction of the sheet P.”

The sheets P that are sequentially conveyed through the second conveyance passage Ph2 are temporarily placed on the internal tray 22 serving as a placement tray. The end fence 23 aligns the position, in the conveyance direction, of the sheet P or the sheet bundle Pb placed on the internal tray 22. The side fences 24L and 24R align the position, in the main scanning direction, of the sheet P or the sheet bundle Pb placed on the internal tray 22. The edge binder 25 and the staple binder 155 perform edge binding on the sheet bundle Pb aligned by the end fence 23 and the side fences 24L and 24R. Then, the conveyance roller pair 15 ejects the sheet bundle Pb subjected to the edge binding to the ejection tray 26.

The post-processing apparatus 3 further includes an end fence 27, a saddle binder 28, a sheet folding blade 29, and the ejection tray 30. The end fence 27, the saddle binder 28, and the sheet folding blade 29 perform the saddle binding on the sheet bundle Pb including the sheets P that are conveyed through the third conveyance passage Ph3. Among the sheets P supplied from the image forming apparatus 2, the sheet bundle Pb subjected to the saddle binding is ejected to the ejection tray 30.

The end fence 27 aligns the positions of the sheets P that are sequentially conveyed through the third conveyance passage Ph3, in a conveyance direction in which the sheets P are conveyed. The end fence 27 can move between a binding position where the end fence 27 causes the center of the sheet bundle Pb to face the saddle binder 28 and a folding position where the end fence 27 causes the center of the sheet bundle Pb to face the sheet folding blade 29. The saddle binder 28 binds the center of the sheet bundle Pb aligned by the end fence 27 at the binding position. The sheet folding blade 29 folds, in half, the sheet bundle Pb placed on the end fence 27 at the folding position and causes the conveyance roller pair 18 to nip the sheet bundle Pb. The conveyance roller pairs 18 and 19 eject the sheet bundle Pb subjected to the saddle binding to the ejection tray 30.

The post-processing apparatus 3 includes, in the edge binder 25, a first liquid storage tank 44 serving as a first liquid storage and a liquid supply member 50 as a part of a liquid applier. The first liquid storage tank 44 and the liquid supply member 50 are omitted in FIG. 2. The post-processing apparatus 3 further includes the liquid supply passage 45 as a part of a liquid supplier, a liquid supply pump 46 as a part of the liquid supplier, a second liquid storage tank 47 as a part of a second liquid storage, and a second liquid storage tank fixer 61 as a part of the second liquid storage, to replenish the first liquid storage tank 44 with liquid. The liquid that is stored in the second liquid storage tank 47 is supplied to the first liquid storage tank 44 via the second liquid storage tank fixer 61, the liquid supply pump 46, and the liquid supply passage 45.

A detailed description is given of the edge binder 25 according to an embodiment of the present disclosure.

FIG. 3 is a schematic diagram illustrating an upstream side of the edge binder 25 in the conveyance direction.

The edge binder 25 performs liquid application and crimp binding illustrated in FIG. 2.

FIG. 4 is a schematic diagram illustrating a liquid applier 31 of the edge binder 25 when viewed from the main scanning direction.

As illustrated in FIG. 3, the edge binder 25 includes the liquid applier 31 and a crimper 32. The liquid applier 31 executes a liquid application process. The crimper 32 serves as a post-processing device and executes a crimping process. The liquid applier 31 and the crimper 32 are disposed downstream from the internal tray 22 in the conveyance direction and adjacent to each other in the main scanning direction.

The liquid applier 31 applies liquid that is stored in the first liquid storage tank 44 to the sheet P or the sheet bundle Pb placed on the internal tray 22. The application of the liquid to the sheet P or the sheet bundle Pb by the liquid applier 31 and the operation of the liquid applier 31 in applying the liquid are referred to as “liquid application” below. The liquid applying operation of the liquid applier 31 involving control processing is referred to as a “liquid application process”.

More specifically, the liquid that is stored in the first liquid storage tank 44 for the liquid application includes, as a main component, the liquid state of a compound of hydrogen and oxygen compound represented by the chemical formula H₂O. The liquid hydrogen-oxygen compound is at any temperature. For example, the liquid hydrogen-oxygen compound may be so-called warm water or hot water.

The liquid hydrogen-oxygen compound is not limited to pure water. The liquid hydrogen-oxygen compound may be purified water or may contain ionized salts. The metal ion content ranges from so-called soft water to ultrahard water. In other words, the liquid hydrogen-oxygen compound is at any hardness.

The liquid that is stored in the first liquid storage tank 44 may include an additive in addition to the main component. The liquid that is stored in the first liquid storage tank 44 may include residual chlorine used as tap water. Preferably, for example, the liquid that is stored in the first liquid storage tank 44 may include, as an additive, a colorant, a penetrant, a pH adjuster, a preservative such as phenoxyethanol, a drying inhibitor such as glycerin, or a combination thereof. Furthermore, because water is used as a component of ink used for inkjet printers or ink used for water-based pens, such water or ink may be used for the “liquid application”.

The water is not limited to the specific examples described above. The water may be water in a broad sense such as hypochlorous acid water or an ethanol aqueous solution diluted for disinfection. However, tap water may be used simply to enhance the binding strength after the binding process because tap water is easy to obtain and store. A liquid including water as a main component as exemplified above enhances the binding strength of the sheet bundle Pb, in comparison with a liquid of which the main component is not water (liquid).

As illustrated in FIGS. 3 and 4, the liquid applier 31 is movable in the main scanning direction together with the crimper 32 by a driving force transmitted from an edge binder movement motor 55. The liquid applier 31 includes a lower pressure plate 33 serving as a receptacle for the sheet P or the sheet bundle Pb, an upper pressure plate 34, and a liquid applier movement assembly 35. The components of the liquid applier 31 (the lower pressure plate 33, the upper pressure plate 34, the liquid applier movement assembly 35, and the liquid applier movement motor 42) are held by the liquid application frame 31a and the base 48.

A liquid applier shaft 562 including a drive transmission gear 562a is fixed to a bottom face of the liquid application frame 31a that holds the components of the liquid applier 31. The liquid applier shaft 562 and the drive transmission gear 562a are held by the base 48 on which the liquid application frame 31a is disposed, so as to be rotatable in the forward and reverse directions. The drive transmission gear 562a meshes with an output gear 563a of a liquid applier pivot motor 563. The liquid applier 31 can be rotated in the forward and reverse directions about the liquid applier shaft 562 on the base 48 by a driving force transmitted from the liquid applier pivot motor 563 to the liquid applier shaft 562 via the output gear 563a and the drive transmission gear 562a.

The lower pressure plate 33 and the upper pressure plate 34 are disposed downstream from the internal tray 22 in the conveyance direction. The sheets P or the sheet bundle Pb that is placed on the internal tray 22 is also placed on the lower pressure plate 33. The lower pressure plate 33 is provided on a lower pressure plate holder 331. The upper pressure plate 34 is movable in the thickness direction of the sheet P or the sheet bundle Pb at a position where the upper pressure plate 34 faces the sheet P or the sheet bundle Pb placed on the internal tray 22.

In other words, the lower pressure plate 33 and the upper pressure plate 34 are disposed to face each other in the thickness direction of the sheet P or the sheet bundle Pb with the sheet P or the sheet bundle Pb placed on the internal tray 22 and interposed between the lower pressure plate 33 and the upper pressure plate 34. In the following description, the thickness direction of the sheet P or the sheet bundle Pb may be referred to simply as “thickness direction.” Further, the upper pressure plate 34 is provided with a through hole 34a passing through the upper pressure plate 34 in the thickness direction at a position opposite to the liquid application member 501 held via the holder 37 attached to the base plate 40. The liquid application member 501 is one end portion of a liquid supply member 50 (liquid absorber) described below and corresponds to a tip portion of the liquid supply member 50.

The liquid applier movement assembly 35 moves the upper pressure plate 34, the base plate 40, the holder 37, the liquid application member 501, the liquid supply member 50, and the first liquid storage tank 44 in the thickness direction of the sheet P or the sheet bundle Pb. The liquid applier movement assembly 35 according to the present embodiment moves the upper pressure plate 34, the base plate 40, the holder 37, the liquid application member 501, the liquid supply member 50, and the first liquid storage tank 44 in conjunction with each other with a single liquid applier movement motor 42. The liquid applier movement assembly 35 includes, for example, a liquid applier movement motor 42, a trapezoidal screw 38, a nut 39, the base plate 40, columns 41a and 41b, and coil springs 42a and 42b.

The liquid applier movement motor 42 generates a driving force to move the upper pressure plate 34, the base plate 40, the holder 37, the liquid application member 501, the liquid supply member 50, and the first liquid storage tank 44. The trapezoidal screw 38 extends in the thickness direction of the sheet P or the sheet bundle Pb and is provided with the liquid application frame 31a such that the trapezoidal screw 38 is rotatable in the forward and reverse directions. The trapezoidal screw 38 is coupled to an output shaft of the liquid applier movement motor 42 via, for example, a pulley and a belt. The nut 39 is screwed to the trapezoidal screw 38. The trapezoidal screw 38 is rotated in the forward and reverse directions by the driving force transmitted from the liquid applier movement motor 42. The rotation of the trapezoidal screw 38 causes the nut 39 to reciprocate on the trapezoidal screw 38.

The base plate 40 is positioned apart from the upper pressure plate 34. The base plate 40 holds the liquid application member 501 with the tip portion of the liquid application member 501 protruding from the base plate 40 toward the upper pressure plate 34. The base plate 40 is coupled to the trapezoidal screw 38 via the nut 39 such that base plate 40 can reciprocate along the trapezoidal screw 38 as the trapezoidal screw 38 rotates in the forward and reverse directions. The position of the base plate 40 in the vertical direction is detected by a movement sensor 40a (see FIG. 8).

The columns 41a and 41b project from the base plate 40 toward the upper pressure plate 34 around the tip portion of the liquid application member 501. The columns 41a and 41b can relatively move with respect to the base plate 40 in the thickness direction. The columns 41a and 41b hold the upper pressure plate 34 with the respective tip ends closer to the lower pressure plate 33 than the other ends of the columns 41a and 41. The other ends of the columns 41a and 41 opposite the ends closer to the lower pressure plate 33 are provided with stoppers that prevent the columns 41a and 41b from being removed from the base plate 40.

The coil springs 42a and 42b are fitted around the columns 41a and 41b, respectively, between the base plate 40 and the upper pressure plate 34. The coil springs 42a and 42b bias the upper pressure plate 34 and the columns 41a and 41b toward the lower pressure plate 33 with respect to the base plate 40.

The liquid applier 31 applies liquid to the sheet P or the sheet bundle Pb placed on the internal tray 22. Specifically, the liquid applier 31 brings the liquid application member 501 into contact with the sheet P or the sheet bundle Pb to apply the liquid to at least one sheet P of the sheet bundle Pb.

The liquid applier 31 includes the first liquid amount detection sensor 43 (serving as a first liquid detector), the first liquid storage tank 44, the liquid application member 501, the liquid supply member 50, and the holder 37. The first liquid storage tank 44 stores the liquid to be applied to the sheet P or the sheet bundle Pb. The amount of liquid that is stored in the first liquid storage tank 44 is detected by the first liquid amount detection sensor 43. The first liquid storage tank 44 is coupled to the base plate 40 via the holder 37.

The liquid application member 501, the liquid supply member 50 (liquid absorber) disposed in close contact with the liquid application member 501, and the first liquid storage tank 44 are held by the holder 37. The holder 37 is held by the base plate 40. The liquid supply member 50 has a first end in close contact with the liquid application member 501 and a second end immersed in the liquid stored in the first liquid storage tank 44. In other words, the second end of the liquid supply member 50 corresponds to a liquid immersion portion 502 that draws up the liquid and supplies the liquid to the liquid application member 501. The liquid application member 501 and the liquid supply member 50 are made of a material (e.g., sponge or fiber) having a high liquid absorption rate, such as an elastic resin formed of open cells. However, at least one of the liquid application member 501 or the liquid supply member 50 is not limited to a particular kind as long as the at least one of the liquid application member 501 or the liquid supply member 50 is made of a material having a property of absorbing and holding the liquid and has a property of being crushable in accordance with a pressing force applied when the at least one of the liquid application member 501 or the liquid supply member 50 is in contact with the sheet P. In other words, the material may be any material as long as the material can absorb or draw up liquid by capillary action.

Accordingly, when the other end portion (the liquid immersion portion 502) of the liquid supply member 50 is immersed in the liquid stored in the first liquid storage tank 44, the liquid supply member 50 draws up the liquid by capillary action. In other words, the liquid stored in the first liquid storage tank 44 is drawn up from a liquid immersion portion 502 of the liquid supply member 50, and the drawn liquid is supplied to the liquid application member 501 that is coupled to the tip portion via the liquid supply member 50. Then, the liquid stored in the first liquid storage tank 44 is drawn up to the liquid application member 501 in close contact with one end portion of the liquid supply member 50, and thus the liquid level (stored liquid amount) of the liquid stored in the first liquid storage tank 44 detected by the first liquid amount detection sensor 43 is lowered. As a result, the liquid is supplied from the second liquid storage tank 47 to the first liquid storage tank 44 by the liquid supply pump 46.

Although the case where the liquid supply member 50 and the liquid application member 501 are separate bodies has been described above, the liquid supply member 50 and the liquid application member 501 may be integrally formed of a material having the same properties (for example, a material having a high liquid absorption rate). In other words, the liquid application member 501 may be part of the liquid supply member 50. In such a case, liquid can be supplied from the liquid supply member 50 to the liquid application member 501 more smoothly by the capillary action and a reduction in cost can be achieved.

At this time, the liquid application member 501 draws up the liquid stored in the first liquid storage tank 44. By so doing, the amount of liquid (liquid level) in the first liquid storage tank 44 temporarily decreases to the level below the reference liquid level described below. In response to this decrease of liquid in the first liquid storage tank 44, a series of liquid supplying operations for feeding liquid from the second liquid storage tank 47 to the first liquid storage tank 44 is performed. This series of liquid supplying operations is mainly performed at the time of activation of the post-processing apparatus 3 or at the time of start of execution of the binding processing involving liquid application in the post-processing apparatus 3, and corresponds to the liquid supplying operations (liquid replenishing and supplying operation) for bringing the liquid application using the liquid application member 501 to be executable. The above-described “reference liquid level” indicates, for example, a liquid level (a stored liquid amount in the first liquid storage tank 44) when the first liquid amount detection sensor 43 detects the liquid in the first liquid storage tank 44.

The edge binder 25 is coupled to the second liquid storage tank 47. The second liquid storage tank 47 is detachably attached to the edge binder 25 or the post-processing apparatus 3 (see FIG. 12). The second liquid storage tank 47 is fixed (set) to the second liquid storage tank fixer 61 (a part of the second liquid storage) at a given position. By so doing, the liquid already stored in the second liquid storage tank 47 can be supplied to the first liquid storage tank 44.

The operation to supply liquid from the second liquid storage tank 47 to the first liquid storage tank 44 by the liquid supply pump 46 is executed in response to a decrease in the stored liquid amount (liquid level) in the first liquid storage tank 44 to be below the reference liquid level. The stored liquid amount (liquid level) of the first liquid storage tank 44 is reduced by the liquid being consumed by liquid application by the liquid applier 31. In other words, the operation to supply liquid from the second liquid storage tank 47 to the first liquid storage tank 44 corresponds to the liquid supply operation in accordance with the execution of the job including liquid application by the liquid applier 31. This liquid supplying operation corresponds to an operation (replenishing operation) of supplying liquid to the first liquid storage tank 44 so as to replenish liquid each time the stored liquid amount (liquid level) of the first liquid storage tank 44 falls below a reference liquid level.

When the second liquid storage tank 47 is set in the second liquid storage tank fixer 61, the second liquid storage tank fixer 61 is filled with a certain amount of the liquid in the second liquid storage tank 47. The second liquid storage tank fixer 61 includes a setting detection sensor 51 (serving as a set detector) (see FIG. 12). When the setting detection sensor 51 detects the set state of the second liquid storage tank 47 in the second liquid storage tank fixer 61 (see FIG. 12C), an output signal indicating the set state is transmitted to the controller 100b described below. Thus, the controller 100b to be described below detects whether the second liquid storage tank 47 is mounted to the second liquid storage tank fixer 61. Details of the second liquid storage tank 47 will be described below.

The first liquid storage tank 44 and the second liquid storage tank 47 are coupled to each other by the liquid supply passage 45. The liquid supply pump 46 is disposed near the second liquid storage tank fixer 61. As the liquid supply pump 46 is driven, the liquid stored in the second liquid storage tank 47 is supplied (replenished) from the second liquid storage tank 47 to the first liquid storage tank 44 via the liquid supply passage 45. Accordingly, the second liquid storage tank fixer 61 is a component of the liquid supplier that executes a liquid supply operation to supply liquid from the second liquid storage tank 47 to the first liquid storage tank 44. The liquid supply passage 45 includes a flexible material. According to such a configuration, even if the first liquid storage tank 44 is moved by the liquid applier movement assembly 35, liquid can be supplied from the second liquid storage tank 47 to the first liquid storage tank 44.

The supply of liquid from the second liquid storage tank 47 to the first liquid storage tank 44 can be controlled in accordance with the detection result of the first liquid amount detection sensor 43. In other words, the controller 100b, which is described below, determines whether the stored liquid amount (liquid level) in the first liquid storage tank 44 based on the detection result of the first liquid amount detection sensor 43. In accordance with the determined stored liquid amount (liquid level) of the first liquid storage tank 44, the controller 100b controls the operation speed and time of the liquid supply pump 46. By so doing, the controller 100b can adjust the amount of liquid to be replenished to the first liquid storage tank 44 to maintain the stored liquid amount (liquid level) in the first liquid storage tank 44 at a constant level of liquid.

A description is given of the configuration of the crimper 32 according to an embodiment of the present disclosure.

The crimper 32 serving as a post-processing device presses and deforms a portion of the sheet bundle Pb by serrated upper crimping teeth 32a and lower crimping teeth 32b, and crimps the sheets P of the portion to bind the sheet bundle Pb. In other words, the crimper 32 can bind the sheet bundle Pb without staples. The components of the crimper 32 such as the upper crimping teeth 32a and the lower crimping teeth 32b are disposed on a crimping frame 32c. Hereinafter, the binding of the sheet bundle Pb by pressing and deforming a predetermined position of the sheet bundle Pb by the crimper 32 is simply referred to as “crimp binding”. The crimping and binding operation of the crimper 32 that involves control processing is referred to as “crimp binding process”.

FIGS. 5A and 5B are schematic diagrams illustrating the configuration of the crimper 32.

As illustrated in FIGS. 5A and 5B, the crimper 32 includes the upper crimping teeth 32a and the lower crimping teeth 32b. The upper crimping teeth 32a and the lower crimping teeth 32b are disposed to face each other in the thickness direction of the sheet bundle Pb with the sheet bundle Pb supported by the internal tray 22 interposed between the upper crimping teeth 32a and the lower crimping teeth 32b. The upper crimping teeth 32a and the lower crimping teeth 32b have respective serrate faces facing each other. The serrate face of each of the upper crimping teeth 32a and the lower crimping teeth 32b includes concave portions and convex portions alternately formed. The concave portions and the convex portions of the upper crimping teeth 32a are shifted from those of the lower crimping teeth 32b such that the upper crimping teeth 32a are engaged with the lower crimping teeth 32b. The upper crimping teeth 32a and the lower crimping teeth 32b are brought into contact with and separated from each other by the driving force of a contact-separation motor 32d illustrated in FIG. 8.

In the process of supplying the sheets P of the sheet bundle Pb to the internal tray 22, the upper crimping teeth 32a and the lower crimping teeth 32b are separated from each other as illustrated in FIG. 5A. When all the sheets P of the sheet bundle Pb are supported on the internal tray 22, the upper crimping teeth 32a and the lower crimping teeth 32b are engaged with each other as illustrated in FIG. 5B by the driving force of the contact-separation motor 32d to press and deform the sheet bundle Pb in the thickness direction. As a result, the sheet bundle Pb that has been placed on the internal tray 22 is crimped and bound. The sheet bundle Pb thus crimped and bound is ejected to the ejection tray 26 by the conveyance roller pair 15.

The configuration of the crimper 32 as a crimping assembly is not limited to the configuration of a moving assembly exemplified in the present embodiment, and may be any other suitable structure in which the upper crimping teeth 32a and the lower crimping teeth 32b of the crimping assembly engage with each other. For example, the crimping assembly may bring the upper crimping teeth 32a and the lower crimping teeth 32b into contact with each other and separate the upper crimping teeth 32a and the lower crimping teeth 32b from each other with a link mechanism and a driving source that simply rotates in the forward direction or that rotates the forward and backward directions (e.g., the crimping assembly disclosed in Japanese Patent No. 6057167). Alternatively, the crimping assembly may employ a linear motion system to linearly bring the upper crimping teeth 32a and the lower crimping teeth 32b into contact with each other and separate the upper crimping teeth 32a and the lower crimping teeth 32b from each other with a screw assembly that converts the forward and backward rotational motions of a driving source into linear reciprocating motion.

As illustrated in FIG. 3, the edge binder 25 includes an edge binder movement assembly 57.

The edge binder movement assembly 57 moves the edge binder 25 (in other words, the liquid applier 31 and the crimper 32) in the main scanning direction along the downstream end of the sheet P, which is placed on the internal tray 22, in the conveyance direction. The edge binder movement assembly 57 includes, for example, the base 48, a guide shaft 49, the edge binder movement motor 55, and a driving force transmission assembly 551 that transmits the driving force of the edge binder movement motor 55 to the base 48, and a standby position sensor 540 (see FIG. 8).

The liquid applier 31 and the crimper 32 are attached to the base 48 such that the liquid applier 31 and the crimper 32 are adjacent to each other in the main scanning direction. As illustrated in FIG. 4, the guide shaft 49 is held by multiple guide shaft brackets 49a disposed in the main scanning direction at a position on the upstream side of a binding assembly base 116 in the conveyance direction of the sheet P. As illustrated in FIG. 3, the guide shaft 49 extends in the main scanning direction on the binding assembly base 116. The guide rail 115 is disposed in the main scanning direction on the downstream side of the binding assembly base 116 in the conveying direction of the sheet P. As illustrated in FIG. 4, the guide rail 115 includes a fitting target portion 115a that fits to a fitting portion 48a of the base 48 in the main scanning direction. In other words, the base 48 is movably held by the guide shaft 49 and the guide rail 115 in the main scanning direction on the binding assembly base 116.

The edge binder movement motor 55 generates a driving force to move the edge binder 25. The driving force transmission assembly 551 transmits the driving force of the edge binder movement motor 55 to the base 48 via pulleys 551a and 551b, a timing belt 551c, and a fastening portion 48b that fastens the base 48 and the timing belt 551c. As a result, the liquid applier 31 and the crimper 32 integrated by the base 48 move in the main scanning direction along the guide shaft 49.

The edge binder movement motor 55 according to the present embodiment is, for example, a servo motor that can stop the edge binder 25 at a target position (for example, a binding position B1 described below) without returning the edge binder 25 to an origin position (for example, a standby position HP described below) every time the edge binder 25 is moved.

The post-processing apparatus 3 further includes a standby position sensor 540 and an encoder sensor 541. The standby position sensor 540 is, for example, a light-shielding optical sensor (see FIG. 8) to detect that the edge binder 25 has reached a standby position HP (see FIG. 10A). The encoder sensor 541 (see FIG. 8) is attached to an output shaft of the edge binder movement motor 55. The controller 100b, which will be described below, detects that the edge binder 25 has reached the standby position HP, based on a detection result of the standby position sensor 540. The controller 100b also counts pulse signals output from the encoder sensor 541 to ascertain the current position of the edge binder 25 moved from the standby position HP.

However, a specific method of stopping the edge binder 25 at the target position without returning the edge binder 25 to the standby position HP is not limited to the aforementioned example. As another example, the post-processing apparatus 3 may include a sensor that detects the arrival of the edge binder 25 at a given target position.

As illustrated in FIG. 3, a crimper shaft 54 provided with a drive transmission gear 54a is fixed to a bottom face of the crimping frame 32c that holds the components of the crimper 32. The crimper shaft 54 and the drive transmission gear 54a are held by the base 48 on which the crimping frame 32c is disposed, so as to be rotatable in the forward and reverse directions. The drive transmission gear 54a meshes with an output gear 56a of a crimper pivot motor 56. The crimper 32 can be rotated in the forward and reverse directions about the crimper shaft 54 on the base 48 by a driving force transmitted from the crimper pivot motor 56 to the crimper shaft 54 via the output gear 56a and the drive transmission gear 54a.

In the above description, the edge binder 25 has a configuration of moving along the guide shaft 49 with the crimper 32 and the liquid applier 31 being integrated, the embodiments of the present disclosure are not limited to the above-described configuration. For example, the crimper 32 and the liquid applier 31 may have a configuration of moving separately from each other.

A description is given of a staple binder 155.

Specifically, a detailed description is now given of the staple binder 155 having a function of executing a stapling process. FIG. 6 is a schematic diagram illustrating the staple binder 155, viewed from the upstream side of the staple binder 155 in the conveyance direction. The staple binder 155 includes a stapler 62 that binds the sheet bundle Pb with staples. The stapler 62 is disposed downstream from the internal tray 22 in the conveyance direction of the sheet P and spaced apart from the edge binder 25 in the main scanning direction.

The stapler 62 serving as a post-processing device has a configuration of performing so-called “stapling” (i.e., stapling process) to bind a sheet bundle Pb with a staple or staples. To be more specific, the stapler 62 includes a stapling-part drive motor 62d illustrated in FIG. 8. The stapling-part drive motor 62d drives a stapling part 62a. The driving force of the stapling-part drive motor 62d causes a staple loaded in the stapling part 62a to penetrate through a sheet bundle Pb, so that the stapling part 62a binds the sheet bundle Pb. Since the stapler 62 has a typical configuration, a detailed description of the stapler 62 will be omitted unless otherwise required.

As illustrated in FIG. 6, the staple binder 155 includes a staple binder movement assembly 77. The staple binder movement assembly 77 moves the staple binder 155 in the main scanning direction along a downstream end in the conveyance direction of the sheet P or the sheet bundle Pb placed on the internal tray 22. The staple binder movement assembly 77 includes, for example, a base 78, the guide shaft 49, a staple binder movement motor 180, and a driving force transmission assembly 181. The driving force transmission assembly 181 transmits a driving force of the staple binder movement motor 180 to the base 78 via pulleys 181a and 181b, a timing belt 181c, and a fastening portion 78a that fastens the base 78 and the timing belt 181c. A stapler shaft 83 including a drive transmission gear 83a is fixed to a bottom face of a stapling frame 62b that holds the components of the stapler 62.

The stapler shaft 83 and the drive transmission gear 83a are held by the base 78 on which the stapling frame 62b is disposed, so as to be rotatable in the forward and reverse directions. The drive transmission gear 83a is engaged with an output gear 820a of the staple binder pivot motor 820. The stapler 62 is rotatable in the forward and reverse directions about the stapler shaft 83 on the base 78 by a driving force transmitted from the staple binder pivot motor 820 to the stapler shaft 83 via the output gear 820a and the drive transmission gear 83a.

The edge binder 25 and the staple binder 155 are supported by the common guide shaft 49. In other words, the edge binder movement assembly 57 and the staple binder movement assembly 77 move the edge binder 25 and the staple binder 155 in the main scanning direction along the common guide shaft 49. The edge binder movement assembly 57 and the staple binder movement assembly 77 can independently move the edge binder 25 and the staple binder 155.

FIG. 7 illustrates a staple binder 155′ as a modification of the staple binder 155. More specifically, FIG. 7 is a schematic diagram illustrating of the staple binder 155′ as viewed from the upstream side in the conveyance direction.

The staple binder 155′ is different from the staple binder 155 in that the staple binder 155′ includes a second liquid applier 612 in addition to the stapler 62. As illustrated in FIG. 7, the staple binder 155′ includes the second liquid applier 612 and the stapler 62. The second liquid applier 612 and the stapler 62 are disposed downstream from the internal tray 22 in the conveyance direction of the sheet P and adjacent to each other in the main scanning direction.

The second liquid applier 612 executes liquid application of applying liquid stored in a third liquid storage tank 73 to the sheet P or the sheet bundle Pb placed on the internal tray 22. A given area including a position to which the liquid is applied on the sheet P or the sheet bundle Pb by the second liquid applier 612 corresponds to a binding position to be stapled by the stapler 62. As illustrated in FIG. 7, the second liquid applier 612 includes a second lower pressure plate 63, a second upper pressure plate 64, a second liquid applier movement assembly 65, and a second liquid application assembly 66. The second liquid applier movement assembly 65 includes, for example, a second liquid applier movement motor 67, a second trapezoidal screw 68, a second nut 69, a second base plate 70, second columns 711a and 711b, and second coil springs 721a and 721b.

The second liquid application assembly 66 includes the third liquid storage tank 73, a second liquid supply portion 75, a second liquid application member 74, and a second joint 76. Since the second liquid application assembly 66 and the liquid application assembly of the liquid applier 31 (including the first liquid storage tank 44, the liquid supply member 50, the liquid application member 501, and the holder 37) illustrated in FIGS. 3 and 4 have common configurations, redundant descriptions thereof will be omitted unless otherwise required. Since the configuration of the stapler 62 illustrated in FIG. 6 is like the configuration of the stapler 62 illustrated in FIG. 7, a detailed description thereof is omitted below unless otherwise required. Since the second liquid applier 612 and the liquid applier 31 that are illustrated in FIG. 3 have common pivot mechanisms, redundant descriptions thereof will be omitted unless otherwise required. The pivot mechanism of the second liquid applier 612 includes a liquid applier pivot motor 563, an output gear 563a, drive transmission gear 562a, and a liquid applier shaft 562.

In the binding process, the staple binder 155′ that is illustrated in FIG. 7 performs the liquid application process on the sheet P to loosen and soften the binding position, allowing the staple to easily pass through the sheet bundle Pb. As a result, the number of sheets to be bound per sheet bundle Pb can be increased as compared with a case where the stapling process is performed without applying the liquid.

A description is given of a control block of the post-processing apparatus 3.

A description is given below of a control block of the post-processing apparatus 3, with reference to FIG. 8.

FIG. 8 is a block diagram illustrating a hardware configuration for executing control processing in the post-processing apparatus 3.

As illustrated in FIG. 8, the post-processing apparatus 3 includes a central processing unit (CPU) 101, a random access memory (RAM) 102, a read only memory (ROM) 103, a hard disk drive (HDD) 104, and an interface (I/F) 105. The CPU 101, the RAM 102, the ROM 103, the HDD 104, and the I/F 105 are connected to each other via a common bus 109.

The CPU 101 is an arithmetic unit and controls the operation of the overall operation of the post-processing apparatus 3.

The RAM 102 is a volatile storage medium that allows data to be read and written at high speed. The CPU 101 uses the RAM 102 as a work area for data processing.

The ROM 103 is a read-only non-volatile storage medium that stores programs such as firmware.

The HDD 104 is a non-volatile storage medium that allows data to be read and written and has a relatively large storage capacity. The HDD 104 stores, e.g., an operating system (OS), various control programs, and application programs.

The post-processing apparatus 3 processes, by an arithmetic function of the CPU 101, e.g., a control program stored in the ROM 103 and an information processing program (or application program) loaded into the RAM 102 from a storage medium such as the HDD 104. Such processing configures a software controller including various functional modules of the post-processing apparatus 3. The software controller that is thus configured cooperates with hardware resources of the post-processing apparatus 3 to construct functional blocks that implement functions of the post-processing apparatus 3. In other words, the CPU 101, the RAM 102, the ROM 103, the HDD 104, and the I/F 105 constitute at least part of a controller 100b serving as a control device that controls the operation of the post-processing apparatus 3.

The I/F 105 is an interface that connects the conveyance roller pairs 10, 11, 14, and 15, the switching member 20, the side fences 24L and 24R, the contact-separation motor 32d, the crimper pivot motor 56, the liquid applier movement motor 42, the liquid applier pivot motor 563, the edge binder movement motor 55, the stapling-part drive motor 62d, the staple binder pivot motor 820, the staple binder movement motor 180, the liquid supply pump 46, a first open-close drive motor 812, a second open-close drive motor 822, the movement sensor 40a, the first liquid amount detection sensor 43, the second liquid amount detection sensor 94, the setting detection sensor 51, the standby position sensor 540, the encoder sensor 541, a first leakage sensor 81, a second leakage sensor 82, and a control panel 110 to the common bus 109.

The controller 100b controls, via the I/F 105, the operations of the conveyance roller pairs 10, 11, 14, and 15, the switching member 20, the side fences 24L and 24R, the contact-separation motor 32d, the crimper pivot motor 56, the liquid applier movement motor 42, the liquid applier pivot motor 563, the edge binder movement motor 55, the stapling-part drive motor 62d, the staple binder pivot motor 820, the staple binder movement motor 180, the liquid supply pump 46, the first open-close drive motor 812, and the second open-close drive motor 822. The controller 100b acquires detection results of the movement sensor 40a, the first liquid amount detection sensor 43, the second liquid amount detection sensor 94, the setting detection sensor 51, the standby position sensor 540, the encoder sensor 541, the first leakage sensor 81, and the second leakage sensor 82.

Although FIG. 8 illustrates only the components related to the edge binder 25 and the staple binder 155 that perform the edge binding, the components related to the saddle binder 28 that performs the saddle binding are also controlled by the controller 100b.

As illustrated in FIG. 1, the image forming apparatus 2 includes the control panel 110. The control panel 110 includes an operating device that receives instructions input by a user and a display serving as a notifier that notifies the user of information. The control panel 110 includes, for example, physical input buttons and a touch screen overlaid on a display. The control panel 110 acquires information from the user through the operation unit and provides the information to the user through the display. A specific example of the notification unit is not limited to the display and may be a light emitting diode (LED) lamp or a speaker. The post-processing apparatus 3 may include a control panel 110 similar to the above-described control panel 110 of the image forming apparatus 2.

As described above, the post-processing apparatus 3 implements the function of performing operation control related to the liquid application by software (control programs) executed by the CPU 101 with hardware resources included in the controller 100b.

In some embodiments, the liquid application performed by the post-processing apparatus 3 may be performed in a form in which the staple binder 155 is provided with only the stapler 62 and the liquid application is performed using the liquid applier 31 of the edge binder 25. Conversely, the edge binder 25 may include only the crimper 32, and the liquid application may be performed in a mode in which the second liquid applier 612 is used. In other words, the post-processing apparatus 3 may have a configuration in which only one of the liquid applier 31 and the second liquid applier 612 performs the liquid application, regardless of the type of the binding process.

In the above description, the staple binder 155′ has a configuration of moving along the guide shaft 49 with the stapler 62 and the second liquid applier 612 being integrated, the embodiments of the present disclosure are not limited to the above-described configuration. For example, the stapler 62 and the second liquid applier 612 may have a configuration of moving separately from each other.

A description is given of a binding process according to an embodiment of the present disclosure.

A description is given below of the binding process executed by the edge binder 25 included in the post-processing apparatus 3.

FIG. 9 is a flowchart of a process of a one-point binding performed by the edge binder 25.

FIGS. 10A, 10B, and 10C are diagrams each illustrating the positions of the edge binder 25 (the liquid applier 31 and the crimper 32) during the one-point binding.

FIGS. 10A, 10B, and 10C do not illustrate changes in the postures of the liquid applier 31 and the crimper 32. The liquid application position to which liquid is applied on a sheet P or a sheet bundle Pb by the liquid applier 31 corresponds to the binding position on the sheet bundle Pb to be crimped by the crimper 32. For this reason, in the following description, the liquid application position and the binding position are denoted by the same reference sign (B1).

For example, the controller 100b starts the binding process illustrated in FIG. 9 when the controller 100b acquires an instruction to execute the binding process from the image forming apparatus 2. In the following description, the instruction to execute the binding process may be referred to as a “binding command.”

The binding command includes, for example, the type of the sheet P (i.e., information affecting the spread of liquid, such as material and thickness), the number of sheets P of the sheet bundle Pb, the number of sheet bundles Pb to be bound, the binding position on the sheet bundle Pb, and the binding posture of the edge binder 25. In the following description, the number of sheets P of the sheet bundle Pb may be referred to as “given number of sheets N” whereas the number of sheet bundles Pb to be bound may be referred to as “requested number of copies M.” The liquid applier 31 and the crimper 32 are assumed to be in a parallel binding posture and located at a standby position HP (FIG. 10A) that is a position shifted in the width direction from the sheets P placed on the internal tray 22 at the start of the binding process.

When the posture that is instructed by the binding command is the “oblique binding posture,” the controller 100b drives the liquid applier pivot motor 563 and the crimper pivot motor 56 to rotate the liquid applier 31 and the crimper 32 of the edge binder 25 into the oblique binding posture (step S701). Alternatively, when the posture that is instructed by the binding command is the “oblique binding posture,” the crimper 32 alone may be rotated to the oblique binding posture while the liquid applier 31 may not be rotated. As a result, the driving assembly may be simplified as compared with a case where both the liquid applier 31 and the crimper 32 are rotated in the forward and reverse directions, and thus effects of cost reduction, downsizing of the apparatus, and reduction of failure of the device are exhibited.

On the other hand, when the posture that is instructed by the binding command is the “parallel binding posture,” the controller 100b omits the aforementioned operation of rotating the liquid applier 31 and the crimper 32 of the edge binder 25 to the oblique binding posture.

The controller 100b drives the edge binder movement motor 55 to move the edge binder 25 in the main scanning direction so that the liquid applier 31 faces the liquid application position B1 instructed by the binding command (step S701). The controller 100b executes the operation of step S701 before a first sheet P is conveyed to the internal tray 22 by the conveyance roller pairs 10, 11, 14, and 15.

The controller 100b rotates the conveyance roller pairs 10, 11, 14, and 15 to store the sheet P, on which the image has been formed by the image forming apparatus 2, onto the internal tray 22 (step S702). The controller 100b moves the side fences 24L and 24R to align the position of the sheet P or the sheet bundle Pb placed on the internal tray 22 in the main scanning direction (step S702). In short, the controller 100b performs so-called jogging.

Subsequently, the controller 100b causes the liquid applier 31 facing the liquid application position B1 to perform liquid application, on the basis of pre-adjusted liquid application control data, in the liquid application position B1 on the sheet P, which has been placed on the internal tray 22 in the immediately preceding step S702 (step S703). In other words, the controller 100b drives the liquid applier movement motor 42 to bring the liquid application member 501 into contact with the binding position B1 on the sheet P placed on the internal tray 22 (see FIG. 10B). In the liquid application process in step S703, the controller 100b adjusts the position at which the liquid application member 501 applies liquid to the sheet P in accordance with the type of the sheet P and the binding position included in the binding command. The controller 100b adjusts the amount of pressing the liquid application member 501 against the sheet P. In other words, the controller 100b controls the driving of the liquid applier movement motor 42 based on the adjusted control data, and adjusts the amount of movement of the liquid application member 501 with respect to the liquid application position B1 of the sheet P placed on the internal tray 22.

The controller 100b determines whether the number of sheets P placed on the internal tray 22 has reached the given number of sheets N instructed by the binding command (step S704). When the controller 100b determines that the number of sheets P placed on the internal tray 22 has not reached the given number of sheets N (NO in step S704), the controller 100b executes the operations of steps S702 to S704 again until the number of sheets P placed on the internal tray 22 reaches the given number of sheets N (YES in step S704). In other words, the controller 100b executes the processing of steps S702 to S704 each time the sheet P is conveyed to the internal tray 22 by the conveyance roller pairs 10, 11, 14, and 15. The liquid application by the liquid applier 31 may be performed on each of the sheets P of the sheet bundle Pb.

When the controller 100b determines that the number of sheets P placed on the internal tray 22 has reached the given number of sheets N (YES in step S704), in step S705, the controller 100b drives the edge binder movement motor 55 to move the edge binder 25 in the main scanning direction such that the crimper 32 faces the binding position B1 as illustrated in FIG. 10C.

The controller 100b causes the crimper 32 to crimp and bind the sheet bundle Pb placed on the internal tray 22 (step S706). The controller 100b causes the conveyance roller pair 15 to eject the sheet bundle Pb thus crimped and bound by the crimper 32 to the ejection tray 26 (step S707). Specifically, the controller 100b drives the contact-separation motor 32d to cause the upper crimping teeth 32a and the lower crimping teeth 32b to pinch the binding position B1 on the sheet bundle Pb placed on the internal tray 22. The sheet bundle Pb is pressed and deformed between the upper crimping teeth 32a and the lower crimping teeth 32b. Thus, the crimper 32 crimps the sheet bundle Pb. Then, the controller 100b rotates the conveyance roller pair 15 to eject the sheet bundle Pb thus crimped and bound to the ejection tray 26.

The sheet bundle Pb supported by the internal tray 22 has a crimping area (corresponding to the binding position B1) pinched between the upper crimping teeth 32a and the lower crimping teeth 32b in step S706. The crimping area overlaps a liquid application area (corresponding to the liquid application position B1) contacted by a distal end (tip portion) of the liquid application member 501 in step S703. In other words, the crimper 32 crimps an area to which liquid is applied by the liquid applier 31 on the sheet bundle Pb placed on the internal tray 22. The crimping area that is pinched by the upper crimping teeth 32a and the lower crimping teeth 32b may completely or partially overlaps the liquid application area contacted by the distal end (tip portion) of the liquid application member 501, to obtain a sufficient binding strength.

The controller 100b determines whether the number of sheet bundles Pb thus ejected to the ejection tray 26 has reached the requested number of copies M indicated by the binding command (step S708). When the controller 100b determines that the number of sheet bundles Pb thus ejected has not reached the requested number of copies M (NO in step S708), the controller 100b executes the operations of step S702 and the following steps again. In other words, when the controller 100b determines that the number of sheet bundles Pb thus ejected has not reached the requested number of copies M (NO in step S708), the controller 100b repeats the operations of steps S702 to S708 until the number of sheet bundles Pb ejected to the ejection tray 26 reaches the requested number of copies M.

On the other hand, when the controller 100b determines that the number of sheet bundles Pb output to the ejection tray 26 has reached the requested number of copies M (YES in step S708), the controller 100b drives the edge binder movement motor 55 to move the edge binder 25 (the liquid applier 31 and the crimper 32) to the standby position HP as illustrated in FIG. 10A (step S709) Further, when the posture instructed by the binding processing instruction is the “oblique binding posture”, the controller 100b drives the liquid applier pivot motor 563 and the crimper pivot motor 56 to rotate the liquid applier 31 and the crimper 32 to the parallel binding posture (S709). On the other hand, when the posture that is instructed by the binding command is the “parallel binding posture,” the controller 100b skips the aforementioned operation of rotating the liquid applier 31 and the crimper 32 to the parallel binding posture. As a result, the edge binder 25 (the liquid applier 31 and the crimper 32) returns to the standby position HP position illustrated in FIG. 10A. In steps S701 and S709, the execution order of the movement in the main scanning direction and the rotation in the forward and reverse directions of the liquid applier 31 and the crimper 32 is not limited to the aforementioned order and may be reversed.

A detailed description is given below of a second liquid storage tank 47 according to an embodiment of the present disclosure.

Referring now to FIGS. 11A, 11B, and 12, a description is given of the arrangement and configuration of the second liquid storage tank 47 in the post-processing apparatus 3.

FIGS. 11A and 11B illustrate example location and configuration of the second liquid storage tank 47 as the main tank.

FIG. 11A illustrates the post-processing apparatus 3 with a cover 71 opened.

FIG. 11B is a cross-sectional side view of the post-processing apparatus 3, illustrating the post-processing apparatus 3 with the cover 71 closed.

As illustrated in FIGS. 11A and 11B, the second liquid storage tank 47 is located so as to be accessible when the cover 71 of the post-processing apparatus 3 is opened.

FIG. 11B, the second liquid storage tank 47 and the second liquid storage tank fixer 61 are disposed on the near side in a depth direction (X direction) of the post-processing apparatus 3. The first liquid storage tank 44 is disposed on the far side in the depth direction (X direction) of the post-processing apparatus 3. A main body side plate 72 of the post-processing apparatus 3 is disposed between the arrangement position of the second liquid storage tank 47 and the second liquid storage tank fixer 61 and the arrangement position of the first liquid storage tank 44. The second liquid storage tank fixer 61 is attached to the main body side plate 72 of the post-processing apparatus 3.

FIG. 12 illustrates the second liquid storage tank 47 attachable to and detachable from the second liquid storage tank fixer 61 and replenished with liquid.

As illustrated in FIG. 12A, the second liquid storage tank 47 is detachably attached to the first liquid storage tank 44 so that the second liquid storage tank 47 can replenish the liquid to the first liquid storage tank 44. As illustrated in FIG. 12B, the second liquid storage tank fixer 61 is provided with the setting detection sensor 51 serving as a setting detector that detects that the second liquid storage tank 47 is set in the second liquid storage tank fixer 61.

When the setting detection sensor 51 detects the set state of the second liquid storage tank 47 in the second liquid storage tank fixer 61 (see FIG. 12c), the controller 100b is notified of an output signal indicating the set state. Thus, the controller 100b detects whether the second liquid storage tank 47 is mounted to the second liquid storage tank fixer 61.

The second liquid amount detection sensor 94 (serving as second liquid detector) that detects the amount of liquid L to be stored in the second liquid storage tank 47 is disposed in the second liquid storage tank fixer 61. The output value (voltage) of the second liquid amount detection sensor 94 is notified to the controller 100b. The controller 100b determines the output value (voltage) of the second liquid amount detection sensor 94 to determine whether the amount of liquid stored in the second liquid storage tank fixer 61 is a required amount of liquid. When the controller 100b determines that the second liquid storage tank 47 is in the mount state based on the output signal of the setting detection sensor 51, the controller 100b turns on the second liquid amount detection sensor 94 such that the remaining amount of liquid (the amount of the liquid stored) in the second liquid storage tank fixer 61 can be detected.

When the second liquid storage tank 47 is not mounted on the second liquid storage tank fixer 61, an outlet of the second liquid storage tank 47 is closed by a liquid supply valve 472 so that the liquid does not leak. As illustrated in FIG. 12C, when the second liquid storage tank 47 is mounted on the second liquid storage tank fixer 61, the liquid supply valve 472 is pushed up to open a liquid discharge port 471a of the second liquid storage tank 47. By so doing, the liquid is flow out from the second liquid storage tank 47 to the second liquid storage tank fixer 61. As a result, the liquid flows out from the second liquid storage tank 47 to the second liquid storage tank fixer 61. The liquid flown from the second liquid storage tank 47 is temporarily stored in the second liquid storage tank fixer 61. Since the second liquid storage tank fixer 61 is coupled to the liquid supply passage 45 described below, the liquid that is stored in the second liquid storage tank fixer 61 flows to the first liquid storage tank 44 via the liquid supply passage 45.

As a measurement to prevent the liquid from being frozen during maintenance of the post-processing apparatus 3, a liquid draining process may be performed to drain the liquid in the post-processing apparatus 3. In the liquid draining process, the liquid remaining in the first liquid storage tank 44 and the liquid supply passage 45 is supplied by the liquid supply pump 46 to the second liquid storage tank fixer 61 via the liquid supply passage 45 in the reverse direction. In order to deal with such a situation, the second liquid storage tank fixer 61 is set to the amount to sufficiently store liquid in the first liquid storage tank 44 and the liquid supply passage 45. The second liquid storage tank fixer 61 has a liquid drain plug 611.

After the liquid remaining in the first liquid storage tank 44 and the liquid supply passage 45 is reversely fed by the liquid supply pump 46 to the second liquid storage tank fixer 61, the liquid drain plug 611 is opened to discharge the liquid stored in the second liquid storage tank fixer 61 from the inside of the post-processing apparatus 3.

A description is given of a liquid reservoir (liquid storage) according to a first embodiment of the present disclosure.

As illustrated in FIG. 13, as an example of a liquid reservoir (liquid storage) according to the first embodiment of the present disclosure, the post-processing apparatus 3 has a configuration including the first liquid storage tank 44, the second liquid storage tank 47, and a liquid supply assembly 80 that couples the first liquid storage tank 44 and the second liquid storage tank 47 to each other to flow liquid between the first liquid storage tank 44 and the second liquid storage tank 47.

The liquid level (stored liquid amount) stored in the first liquid storage tank 44 is detected by the first liquid amount detection sensor 43. The first liquid amount detection sensor 43 is, for example, an electrode sensor having a pair of electrodes. By applying a voltage to the pair of electrodes, the presence or absence of liquid stored in the first liquid storage tank 44 can be acquired by a voltage fluctuation (output value of the first liquid amount detection sensor 43). The output value (voltage) from the first liquid amount detection sensor 43 is transmitted to the controller 100b via the I/F 105. The controller 100b determines whether or not the position of the liquid surface (the stored liquid amount) in the first liquid storage tank 44 has reached the position of the reference liquid level by determining whether or not the output value (voltage) from the first liquid amount detection sensor 43 exceeds a given threshold value.

The second liquid storage tank 47 that stores liquid to be supplied to the first liquid storage tank 44 includes a second liquid amount detection sensor 94 that detects the amount (level) of the liquid in the second liquid storage tank 47. The second liquid amount detection sensor 94 serves as a sensor to detect liquid stored in the second liquid storage tank fixer 61 and can be used as an electrode sensor, similarly to the first liquid amount detection sensor 43. Accordingly, the controller 100b determines the fluctuation of the applied voltage (the output value of the second liquid amount detection sensor 94), so that the second liquid amount detection sensor 94 can determine whether the liquid surface (the reference liquid level) in the second liquid storage tank 47 is at the given position.

When the controller 100b determines that the liquid level (the stored liquid amount) in the first liquid storage tank 44 has not reached the given position, the controller 100b causes the liquid supply pump 46 to start. The liquid supply pump 46 is disposed in the liquid supply passage 45 that couples the first liquid storage tank 44 and the second liquid storage tank 47 to each other and is used to supply liquid (for example, water) from the second liquid storage tank 47 to the first liquid storage tank 44. When the liquid supply pump 46 is operated, liquid is supplied from the second liquid storage tank 47 to the first liquid storage tank 44. As a result, when the controller 100b determines that the liquid level (the stored liquid amount) in the first liquid storage tank 44 is above the given position, the controller 100b causes the liquid supply pump 46 to stop to end the series of the liquid supplying operations.

The liquid stored in the first liquid storage tank 44 is drawn up by the capillary action of the liquid supply member 50 and moves to the liquid application member 501, and the liquid application member 501 comes into contact with the sheet P to apply the liquid to the sheet P.

The liquid supply assembly 80 replenishes liquid from the first liquid storage tank 44 to the second liquid storage tank 47 and includes the liquid supply passage 45 that couples the first liquid storage tank 44 and the second liquid storage tank 47 to each other to flow liquid between the first liquid storage tank 44 and the second liquid storage tank 47. The liquid supply pump 46 is disposed in the liquid supply passage 45. The liquid supply pump 46 is connected to the I/F 105 and the operation of the liquid supply pump 46 is controlled by the controller 100b.

The liquid supply assembly 80 includes a first on-off valve 811 and a second on-off valve 821. The first on-off valve 811 serves as a first flow liquid limiter to restrict (limit) the flow of liquid in the coupler of the liquid supply passage 45 and the first liquid storage tank 44. The second on-off valve 821 serves as a second liquid flow limiter to restrict (limit) the flow of liquid in the coupler of the liquid supply passage 45 and the second liquid storage tank 47. The liquid supply assembly 80 further includes a first leakage sensor 81 and a second leakage sensor 82, which will be described below. The first leakage sensor 81 and the second leakage sensor 82 detect leakage of liquid that triggers the operations of the first liquid flow limiter and the second liquid flow limiter, respectively.

In other words, the liquid supply assembly 80 includes the first leakage sensor 81 that detects leakage of liquid on the coupling side where the liquid supply passage 45 is coupled to the first liquid storage tank 44, and the second leakage sensor 82 that detects leakage of liquid on the coupling side where the liquid supply passage 45 is coupled to the second liquid storage tank 47. The liquid supply assembly 80 restricts (limits) the flow of liquid in the liquid supply passage 45 by the first on-off valve 811, the second on-off valve 821, or both, based on the detection results (leakage detection results) of the first leakage sensor 81 and the second leakage sensor 82 as liquid leakage detectors.

The first on-off valve 811 is driven by a first open-close drive motor 812 to open or close a first coupler 91 of the liquid supply passage 45 and the first liquid storage tank 44.

The second on-off valve 821 is driven by a second open-close drive motor 822 to open or close a second coupler 92 of the liquid supply passage 45 and the second liquid storage tank 47.

When the first leakage sensor 81 detects liquid leakage from the first coupler 91 of the liquid supply passage 45 and the first liquid storage tank 44, the controller 100b drives the first open-close drive motor 812 to close the first on-off valve 811 and drives the second open-close drive motor 822 to open the second on-off valve 821. Then, the controller 100b causes the liquid supply pump 46 to start to feed the liquid remaining in the liquid supply passage 45 toward the second liquid storage tank 47.

When the second leakage sensor 82 detects liquid leakage from the second coupler 92 of the liquid supply passage 45 and the second liquid storage tank 47, the controller 100b drives the second open-close drive motor 822 to close the second on-off valve 821 and drives the first open-close drive motor 812 to open the first on-off valve 811. Then, the controller 100b causes the liquid supply pump 46 to start to feed the liquid remaining in the liquid supply passage 45 toward the first liquid storage tank 44.

When both the first leakage sensor 81 and the second leakage sensor 82 detect liquid leakage, the controller 100b stops the liquid supply pump 46 and causes both the first on-off valve 811 and the second on-off valve 821 to close to stop the flow of the liquid in the liquid supply passage 45.

The operation of the liquid supply pump 46 to feed the liquid from the second liquid storage tank 47 toward the first liquid storage tank 44 is referred to as “forward feeding.” In addition, the operation of the liquid supply pump 46 to feed the liquid from the first liquid storage tank 44 to the second liquid storage tank 47 is referred to as “reverse feeding.”

FIG. 14 illustrates a state of the liquid supply assembly 80 when liquid leakage is detected in the first coupler 91 of the first liquid storage tank 44.

When the first leakage sensor 81 detects the liquid leakage, the controller 100b drives the first open-close drive motor 812 to close the first on-off valve 811 so as to shut the liquid supply passage 45 and drives the second open-close drive motor 822 to open the second on-off valve 821. Then, the controller 100b causes the liquid supply pump 46 to rotate in reverse, so that the liquid remaining in the liquid supply passage 45 is fed to the second liquid storage tank fixer 61 to which the second liquid storage tank 47 is fixed. This configuration can reduce or prevent a damage due to liquid leakage.

It is desirable that the second liquid storage tank 47 has a capacity of a degree or more at which the liquid does not overflow when the whole remaining liquid in the liquid supply passage 45 is reversely fed even in a state where the liquid is detected by the second liquid amount detection sensor 94.

FIG. 15 illustrates a state of the liquid supply assembly 80 when liquid leakage is detected in the second coupler 92 of the second liquid storage tank 47.

When the second leakage sensor 82 detects the liquid leakage, the controller 100b drives the second open-close drive motor 822 to close the second on-off valve 821 so as to shut the liquid supply passage 45 and drives the first open-close drive motor 812 to open the first on-off valve 811. Then, the controller 100b causes the liquid supply pump 46 to feed the liquid remaining in the liquid supply passage 45 to the first liquid storage tank 44 in the forward direction. This configuration can reduce or prevent a damage due to liquid leakage.

It is desirable that the first liquid storage tank 44 has a capacity of a degree or more at which the liquid does not overflow when the whole remaining liquid in the liquid supply passage 45 is normally fed even in a state where the liquid is detected by the first liquid amount detection sensor 43.

FIG. 16 illustrates a state of the liquid supply assembly 80 when liquid leakage is detected in both the first coupler 91 of the first liquid storage tank 44 and the liquid supply passage 45 and the second coupler 92 of the second liquid storage tank 47 and the liquid supply passage 45.

When both the first leakage sensor 81 and the second leakage sensor 82 detect liquid leakage, the controller 100b drives the first open-close drive motor 812 to close the first on-off valve 811 to shut the liquid supply passage 45 and drives the second open-close drive motor 822 to close the second on-off valve 821 to shut the liquid supply passage 45. Then, the controller 100b causes the liquid supply pump 46 to stop. This configuration can restrict the liquid to flow to the portion having liquid leakage to prevent a damage due to the liquid leakage.

Control Flow of Liquid Leakage Detection Process

A description is given below of a control flow of a liquid leakage detection process executable in the post-processing apparatus 3 according to the present embodiment.

As described with reference to FIGS. 14 to 16, the liquid leakage detection process according to the present embodiment is a process, controlled by the controller 100b, of blocking the liquid supply passage 45 using the first on-off valve 811 and the second on-off valve 821 included in the liquid supply assembly 80. In other words, the control program executed by the controller 100b is a process for obtaining a given effect by cooperating with the liquid supply assembly 80 as hardware resources.

FIG. 17 is a flowchart of the entire control flow of the liquid leakage detection process.

Hereinafter, this control flow is referred to as a “liquid leakage detection process flow.”

It is assumed that the post-processing apparatus 3 includes the liquid applier 31. As the liquid leakage detection process flow is started, the controller 100b determines whether the first liquid storage tank 44 has liquid leakage based on the detection result (the output signal) of the first leakage sensor 81 (step S1501). When the output signal of the first leakage sensor 81 is an ON signal, the controller 100b determines that the liquid supply passage 45 on the side close to the first liquid storage tank 44 has liquid leakage (liquid leakage). On the other hand, when the output signal of the first leakage sensor 81 is an OFF signal, the controller 100b determines that the liquid supply passage 45 on the side close to the first liquid storage tank 44 does not have liquid leakage (no liquid leakage).

Then, the controller 100b determines whether the output signal of the first leakage sensor 81 is an OFF signal (step S1501). When the controller 100b determines that the output signal of the first leakage sensor 81 is an ON signal (NO in step S1501), the liquid is leaked in the liquid supply passage 45 on the side close to the first liquid storage tank 44, and the process moves to the first restriction process (step S1507).

On the other hand, when the controller 100b determines that the output signal of the first leakage sensor 81 is an OFF signal (YES in step S1501), the liquid is not leaked in the liquid supply passage on the side close to the first liquid storage tank 44, and the controller 100b then determines whether the second liquid storage tank 47 has liquid leakage based on the detection result (output signal) of the second leakage sensor 82 (step S1502). When the output signal of the second leakage sensor 82 is the ON signal, the controller 100b determines that the liquid supply passage 45 on the side close to the second liquid storage tank 47 has liquid leakage (liquid leakage). On the other hand, when the output signal of the second leakage sensor 82 is an OFF signal, the controller 100b determines that the liquid supply passage 45 on the side close to the second liquid storage tank 47 does not have liquid leakage (no liquid leakage).

Then, the controller 100b determines whether the output signal of the second leakage sensor 82 is an OFF signal (step S1502). When the controller 100b determines that the output signal of the second leakage sensor 82 is an ON signal (NO in step S1502), the liquid is leaked in the liquid supply passage 45 on the side close to the second liquid storage tank 47, and the process moves to the second restriction process (step S1508).

On the other hand, when the controller 100b determines that the output signal of the second leakage sensor 82 is an OFF signal (YES in step S1502), the liquid is not leaked in the liquid supply passage 45 on the side close to the second liquid storage tank 47.

Then, the controller 100b drives the first open-close drive motor 812 and the second open-close drive motor 822 to open the first on-off valve 811 and the second on-off valve 821 (step S1503).

The controller 100b then drives the liquid supply pump 46 to rotate in the forward direction to feed the liquid from the second liquid storage tank 47 to the first liquid storage tank 44 (step S1504). After the liquid supply pump 46 starts supplying the liquid, the controller 100b determines whether there is any liquid left in the first liquid storage tank 44 (the stored liquid amount) based on the output value (voltage) from the first liquid amount detection sensor 43 (step S1505). More specifically, the controller 100b determines whether the output value (voltage) from the first liquid amount detection sensor 43 is equal to or greater than the liquid detection threshold value (for example, the value equal to or greater than the output voltage V1, referred to as a “threshold value”).

When the output value (voltage) from the first liquid amount detection sensor 43 is equal to or greater than the threshold value (YES in step S1505), the controller 100b determines that a sufficient amount of liquid is supplied by the liquid supply pump 46 from the second liquid storage tank 47 to the first liquid storage tank 44. In this case, the controller 100b stops (turns off) the liquid supply pump 46, stops the supply of liquid from the second liquid storage tank 47 to the first liquid storage tank 44 (step S1506), and ends the liquid leakage detection process flow. On the other hand, when the output value (voltage) from the first liquid amount detection sensor 43 is less than the threshold value (NO in step S1505), the controller 100b determines that the supply of liquid by the liquid supply pump 46 from the second liquid storage tank 47 to the first liquid storage tank 44 is not sufficient. In this case, the controller 100b continues the supply of liquid by the liquid supply pump 46 from the second liquid storage tank 47 to the first liquid storage tank 44 until the output value (voltage) of the first liquid amount detection sensor 43 reaches the value equal to or greater than the threshold value (YES in step $1505).

FIG. 18 illustrates a state of the liquid supply assembly 80 when no liquid leakage is detected, and the liquid is fed in the forward direction from the second liquid storage tank 47 to the first liquid storage tank 44.

Control Flow of First Restriction Process

A description is given of a first restriction process executed when the position of detecting liquid leakage is on the side close to the first liquid storage tank 44.

FIG. 19 is a flowchart of the entire control flow of the first restriction process.

Hereinafter, this control flow is referred to as a “first restriction process flow.”

In the liquid leakage detection process flow of FIG. 17, when the controller 100b determines that the liquid is leaked on the side close to the first liquid storage tank 44 (NO in step S1501), the liquid leakage detection process flow moves to the first restriction process (step S1507). When the first restriction process flow of FIG. 19 is started, the controller 100b determines whether the liquid is leaked on the side close to the second liquid storage tank 47 based on the detection result (output signal) of the second leakage sensor 82 (step S1701). The determination of whether liquid is leaked on the second liquid storage tank 47 includes the same flow as the flow described above, and thus the description thereof will be omitted. When the controller 100b determines that the liquid is leaked on the side close to the second liquid storage tank 47 based on the detection result (output signal) of the second leakage sensor 82 (NO in step S1701), the controller 100b moves to the third restriction process (step S1709).

When no liquid leakage is detected in the second leakage sensor 82 (YES in step S1701), the controller 100b determines whether the liquid application by the liquid applier 31 is in operation (step S1702). When the controller 100b determines that the liquid application by the liquid applier 31 is in operation (YES in step S1702), the controller 100b drives the first open-close drive motor 812 and the second open-close drive motor 822 to close the first on-off valve 811 and open the second on-off valve 821 (step S1703).

Then, the controller 100b causes the liquid supply pump 46 to rotate in the reverse direction, so that the liquid remaining in the liquid supply passage 45 is fed in the reverse direction to the second liquid storage tank 47 (hereinafter, referred to as a “reverse draining process”) (step S1704). After the start of the reverse draining process, the controller 100b determines whether a specified time has elapsed (step S1705). After the reverse draining process is started, when the controller 100b determines that the specified time has not elapsed (NO in step S1705), the controller 100b continues the reverse draining process until the specified time elapses (YES in step S1705).

On the other hand, after the reverse draining process is started, when the controller 100b determines that the specified time has elapsed (YES in step S1705), the controller 100b stops the reverse rotation of the liquid supply pump 46 to stop the reverse draining process (step S1706).

Then, after the liquid supply pump 46 is stopped, the controller 100b determines whether the liquid application by the liquid applier 31 has been finished (step S1707). When the controller 100b determines that the liquid application by the liquid applier 31 is in operation (NO in step S1707), the controller 100b repeats the process of step S1707 until the liquid application by the liquid applier 31 is finished.

When the controller 100b determines that the liquid application by the liquid applier 31 is finished (YES in step S1707), the controller 100b notifies the user on the control panel 110 about the information indicating that the liquid is leaked on the side close to the first liquid storage tank 44, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S1708). Then, the controller 100b returns to the liquid leakage detection process flow (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

When the controller 100b determines that the liquid application by the liquid applier 31 is not in operation (NO in step S1702), the controller 100b determines that the liquid is leaked on the side closer to the first liquid storage tank 44, and performs the processes similar to the processes of steps S1703 to S1706 (steps S1710 to S1713).

After stopping the operation of the liquid supply pump 46 and finishing the reverse draining process (step S1713), the controller 100b notifies the users via the control panel 110 about the information indicating that the liquid is leaked, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S1714) without determining whether the liquid application by the liquid applier 31 is finished. Then, the controller 100b returns to the liquid leakage detection process flow (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

The “specified time” that is referred to in steps S1705 and S1712 is desirably equivalent to a time during which the liquid in the liquid supply passage 45 is correctly fed back to the second liquid storage tank 47 by operating the liquid supply pump 46 in the forward rotation.

FIG. 20 illustrates a state of the liquid supply assembly 80 when the liquid is reversely fed to the second liquid storage tank 47 in response to the detection that the liquid is leaked on the side close to the first liquid storage tank 44.

Control Flow of Second Restriction Process

A description is given of a second restriction process executed when the position of detecting liquid leakage is on the side close to the second liquid storage tank 47.

FIG. 21 illustrates an example of the entire control flow of the second restriction process (hereinafter, referred to as a “second restriction process flow”).

In the liquid leakage detection process flow of FIG. 17, when the controller 100b determines that the liquid is leaked on the side close to the second liquid storage tank 47 (NO in step S1502), the liquid leakage detection process flow moves to the second restriction process (step S1508). As the second restriction process flow illustrated in FIG. 21 is started, the controller 100b determines whether the liquid application by the liquid applier 31 has been (step S1901). When the controller 100b determines that the liquid application by the liquid applier 31 is in operation (YES in step S1901), the controller 100b drives the first open-close drive motor 812 and the second open-close drive motor 822 to open the first on-off valve 811 and close the second on-off valve 821 (step S1902).

Then, the controller 100b causes the liquid supply pump 46 to rotate in the forward direction, so that the liquid remaining in the liquid supply passage 45 is fed in the forward direction to the first liquid storage tank 44 (hereinafter, referred to as a “forward draining process”) (step S1903). After the start of the forward draining process, the controller 100b determines whether a specified time has elapsed (step S1904). After the forward draining process is started, when the controller 100b determines that the specified time has not elapsed (NO in step S1904), the controller 100b continues the forward draining process until the specified time elapses (YES in step S1904).

On the other hand, after the forward draining process is started, when the controller 100b determines that the specified time has elapsed (YES in step S1904), the controller 100b stops the reverse rotation of the liquid supply pump 46 to stop the forward draining process (step S1905).

Then, after the liquid supply pump 46 is stopped, the controller 100b determines whether the liquid application by the liquid applier 31 has been finished (step S1906). When the controller 100b determines that the liquid application by the liquid applier 31 is in operation (NO in step S1906), the controller 100b repeats the process of step S1906 until the liquid application by the liquid applier 31 is finished.

When the controller 100b determines that the liquid application by the liquid applier 31 is finished (YES in step S1906), the controller 100b notifies the user on the control panel 110 about the information indicating that the liquid is leaked on the side close to the second liquid storage tank 47, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S1907). Then, the controller 100b returns to the liquid leakage detection process flow (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

When the controller 100b determines that the liquid application by the liquid applier 31 is not in operation (NO in step S1901), the controller 100b determines that the liquid is leaked on the side closer to the second liquid storage tank 47, and performs the processes similar to the processes of steps S1902 to S1905 (steps $1908 to S1911).

After stopping the operation of the liquid supply pump 46 and finishing the forward draining process (step S1911), the controller 100b notifies the users via the control panel 110 about the information indicating that the liquid is leaked on the side close to the second liquid storage tank 47, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S1912) without determining whether the liquid application by the liquid applier 31 is finished. Then, the controller 100b returns to the liquid leakage detection process flow in FIG. 17 (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

The “specified time” that is referred to in steps S1904 and S1910 is desirably equivalent to a time during which the liquid in the liquid supply passage 45 is correctly fed in the forward direction to the first liquid storage tank 44 by operating the liquid supply pump 46 in the forward rotation.

FIG. 22 illustrates a state of the liquid supply assembly 80 when the liquid is fed in the forward direction to the first liquid storage tank 44 in response to the detection that the liquid is leaked on the side close to the second liquid storage tank 47.

Control Flow of Third Restriction Process

A description is given of a third restriction process executed when the position of detecting liquid leakage is on the side close to both the first liquid storage tank 44 and the second liquid storage tank 47.

FIG. 23 illustrates an example of the entire control flow of the third restriction process (hereinafter, referred to as a “third restriction process flow”).

In the first restriction process flow of FIG. 19, when the controller 100b determines that the liquid is leaked on the side close to the second liquid storage tank 47 based on the detection result (output signal) of the second leakage sensor 82 (NO in step S1701), the controller 100b moves to the third restriction process (step S1709). As the third restriction process flow illustrated in FIG. 23 is started, the controller 100b determines whether the liquid application by the liquid applier 31 is in operation (step S2101). When the controller 100b determines that the liquid application by the liquid applier 31 is in operation (YES in step S2101), the controller 100b drives the first open-close drive motor 812 and the second open-close drive motor 822 to close the first on-off valve 811 and close the second on-off valve 821 (step S2102).

The controller 100b stops the operation of the liquid supply pump 46 (step S2103). Then, the controller 100b stops the liquid application by the liquid applier 31 (step S2104). Then, the controller 100b notifies the user on the control panel 110 about the information indicating that the liquid is leaked on the sides close to both the first liquid storage tank 44 and the second liquid storage tank 47, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S2105). Then, the controller 100b returns to the liquid leakage detection process flow in FIG. 17 (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

When the controller 100b determines that the liquid application by the liquid applier 31 is not in operation (NO in step S2101), the controller 100b determines that the liquid is leaked on the sides closer to both the first liquid storage tank 44 and the second liquid storage tank 47, and performs the processes similar to the processes of steps S2102 and S2103 (steps S2106 and S2107).

After the operation of the liquid supply pump 46 is stopped (step S2107), the controller 100b notifies the user on the control panel 110 about the information indicating that the liquid is leaked on the sides close to both the first liquid storage tank 44 and the second liquid storage tank 47, and notifies the users of the post-processing apparatus 3 of the liquid leakage and the estimated location of the liquid leakage (step S2108). Then, the controller 100b returns to the liquid leakage detection process flow in FIG. 17 (refer to “A” in the flowchart of FIG. 17), and ends the liquid leakage detection process flow.

FIG. 24 illustrates a state of the liquid supply assembly 80 when the liquid leakage on the sides close to both the first liquid storage tank 44 and the second liquid storage tank 47 is detected.

A description is given below of a liquid leakage detector according to a first embodiment of the present disclosure.

A description is given below of a liquid leakage detector including the first leakage sensor 81 and the second leakage sensor 82, according to a first embodiment of the present disclosure.

FIGS. 25A and 25B are enlarged views of the liquid leakage detector on the side close to the first liquid storage tank 44.

The following description is made related to the first leakage sensor 81 on the side close to the first liquid storage tank 44. However, the configuration of the second leakage sensor 82 is substantially same as the configuration of the first leakage sensor 81.

As illustrated in FIG. 25A, when the liquid leakage occurs in the first coupler 91 of the first liquid storage tank 44 and the liquid supply passage 45, the liquid absorption member 911 is wound around the first coupler 91 to prevent the liquid from leaking from the liquid supply passage 45. By so doing, even when the liquid is leaked in the first coupler 91, the liquid absorption member 911 draws up a certain amount of liquid, which can prevent the post-processing apparatus 3 from being stopped due to the liquid leakage.

The liquid absorption member 911 includes a material that allows liquid to seep out. Thus, as the amount of liquid absorbed increases, the liquid seeps out through the liquid absorption member 911. In this case, as illustrated in FIG. 25B, the first leakage sensor 81 is disposed in contact with the liquid absorption member 911. Due to this layout, when the liquid seeped out from the liquid absorption member 911 contacts an electrode pair 813 of the first leakage sensor 81, which short-circuits the electrode pair 813. As a result, the controller 100b can determine the occurrence of liquid leakage by detecting the change in the output signal (voltage) from the first leakage sensor 81 caused by this short-circuit.

Further, as illustrated in FIG. 26A, the first leakage sensor 81 can adjust the accuracy in a detection of liquid leakage by disposing more than one electrode pair 813.

In addition, as illustrated in FIG. 26B, the first leakage sensor 81 can adjust the accuracy in a detection of liquid leakage by adjusting the thickness of the electrode pair 813 and the interval of the electrode pair 813.

A description is given below of a liquid leakage detector including the first leakage sensor 81 and the second leakage sensor 82, according to a second embodiment of the present disclosure.

FIGS. 27A and 27B are enlarged views of the first leakage sensor 81.

As illustrated in FIG. 27A, not the first coupler 91 but the liquid absorption member 911 disposed below the first coupler 91 serves as a leaked liquid receiver, and the first leakage sensor 81 is disposed in contact with the liquid absorption member 911. By so doing, even when the liquid is leaked in the first coupler 91, the liquid absorption member 911 can temporarily stop the leaked liquid from leaking further. As the liquid is further leaked, the electrode pair 813 in contact with the liquid absorption member 911 is short-circuited. As a result, the controller 100b can determine the occurrence of liquid leakage by detecting the change in the output signal (voltage) from the first leakage sensor 81 caused by this short-circuit.

As illustrated in FIG. 27B, the first leakage sensor 81 is included in an in-sensor liquid storage 912 (third liquid storage) serving as a leaked liquid receiver disposed below the first coupler 91. When liquid is leaked into the in-sensor liquid storage 912 disposed in the leakage sensor, the electrode pair 813 disposed in contact with the in-sensor liquid storage 912 may be short-circuited. Since the first coupler 91 and the first leakage sensor 81 do not include a liquid absorption member, a quick response can be med to the liquid leakage.

According to the present embodiment described above, the post-processing apparatus 3 that enhances the crimp binding strength by performing the liquid application can reduce or prevent a negative impact caused by the liquid leakage in the mechanism or assembly to supply liquid used for the liquid application. In other words, when liquid leakage occurs in the liquid supply assembly, the post-processing apparatus 3 can close the on-off valve disposed on the side close to the liquid tank, drain the liquid remaining in the liquid supply passage (pipe) to the side with no liquid leakage, and reduce or prevent the negative impact due to the liquid leakage.

In the above description, the controller 100b of the post-processing apparatus 3 is provided separately from the controller 100a of the image forming apparatus 2 as illustrated in FIG. 1. However, embodiments of the present disclosure are not limited to the above-described configuration. For example, as illustrated in FIG. 37A, the controller 100b of the post-processing apparatus 3 may be disposed in the image forming apparatus 2. Further, as illustrated in FIG. 37B, the controller 100b of the post-processing apparatus 3 may be integrated with the controller 100a of the image forming apparatus 2.

As illustrated in FIG. 38A, the controller 100b of the post-processing apparatus 3 may be divided into a controller 100b1 (e.g., a drive unit such as a motor) and a controller 100b2 (a detector such as a sensor) according to the function, and the controller 100b2 of the post-processing apparatus 3 may be disposed in the image forming apparatus 2. Further, as illustrated in FIG. 38B, the controller 100b2 of the post-processing apparatus 3 disposed in the image forming apparatus 2 may be integrated with the controller 100a of the image forming apparatus 2.

A description is given below of a post-processing apparatus 3 according to a second embodiment of the present disclosure.

Referring now to FIGS. 28 to 36, a description is given of a post-processing apparatus 3A according to a second embodiment of the present disclosure.

In the following description, components like those of the post-processing apparatus 3 according to the first embodiment are denoted by like reference numerals, and redundant descriptions thereof may be omitted unless otherwise required.

The post-processing apparatus 3A according to the second embodiment includes an edge binder 251. The edge binder 251 is different from the edge binder 25 of the post-processing apparatus 3 according to the first embodiment, in which the liquid applier 31 and the crimper 32 are arranged side by side, in that the edge binder 251 includes a crimper 32′ and a liquid applier 131 is disposed at an upstream position in a direction in which a sheet P is conveyed. Thus, a predetermined number of sheets P can be pre-stacked after the liquid application processing and conveyed to the crimper 32′ of the edge binder 251 provided on the downstream side, and therefore, the productivity of the binding processing in the crimper 32′ can be enhanced.

Since the direction in which the conveyance roller pairs 10, 11, and 14 convey the sheet P is opposite to the “conveyance direction” defined above, the direction in which the conveyance roller pairs 10, 11, and 14 convey the sheet P is defined as an “opposite conveyance direction” in the following description. A direction that is orthogonal to both the opposite conveyance direction and the thickness direction of the sheet P is defined as the “main scanning direction” or the “width direction of the sheet P.” The liquid application position to which liquid is applied on a sheet P or a sheet bundle Pb by the liquid applier 131 corresponds to the binding position on the sheet bundle Pb to be crimped by the crimper 32′. For this reason, in the following description, the liquid application position and the binding position are denoted by the same reference sign (B1).

FIG. 28 is a diagram illustrating an internal configuration of the post-processing apparatus 3A according to the second embodiment of the present disclosure.

As illustrated in FIGS. 29A, 29B, and 29C, the edge binder 251 includes only the crimper 32′. As illustrated in FIGS. 29A, 29B, and 29C, the crimper 32′ and the staple binder 156 are disposed downstream from the internal tray 22 in the conveyance direction. In addition, the crimper 32′ and the staple binder 156 are located to face a downstream end, in the conveyance direction, of the sheet bundle Pb placed on the internal tray 22 and is movable in the main scanning direction.

Further, the crimper 32′ and the staple binder 156 are respectively rotatable in the forward and reverse directions about a crimper shaft 340 and a stapler shaft 84 both extending in the thickness direction of the sheet bundle Pb placed on the internal tray 22. In other words, the crimper 32′ and the staple binder 156 bind, at a desired angle, a desired position in the main scanning direction on the sheet bundle Pb placed on the internal tray 22 in, for example, corner oblique binding, parallel one-point binding, or parallel two-point binding.

The crimper 32′ presses and deforms the sheet bundle Pb with the serrate upper crimping teeth 32a and the serrate lower crimping teeth 32b to bind the sheet bundle Pb. In the following description, such a binding way may be referred to as “crimping.” In other words, the crimper 32′ crimps and binds the sheet bundle Pb or performs the crimping on the sheet bundle Pb. On the other hand, the staple binder 156 passes the staple through a binding position on the sheet bundle Pb placed on the internal tray 22 to staple the sheet bundle Pb.

Each of FIGS. 29A to 29C is a view of the internal tray 22 in the thickness direction of the sheet bundle Pb.

FIG. 30 is a schematic diagram illustrating the crimper 32′ as viewed from the downstream side in the conveyance direction.

As illustrated in FIGS. 29A, 29B, and 29C, the crimper 32′ and the staple binder 156 are disposed downstream from the internal tray 22 in the conveyance direction. The crimper 32′ is movable in the main scanning direction along the surface of the sheet bundle Pb placed on the internal tray 22. Further, the crimper 32′ is rotatable in the forward and reverse directions about a crimper shaft 340 extending in the thickness direction of the sheet bundle Pb placed on the internal tray 22.

Similarly, the staple binder 156 is movable in the main scanning direction of the sheet bundle Pb. Further, the staple binder 156 is rotatable in the forward and reverse directions about a stapler shaft 84 extending in thickness direction of the sheet bundle Pb. The other components of the staple binder 156 are similar to, even if not the same as, those of the staple binder 155 (see FIG. 6) of the post-processing apparatus 3 according to the first embodiment. For this reason, a detailed description thereof is omitted.

As illustrated in FIG. 30, the crimper 32′ includes a guide rail 337 extending in the main scanning direction at a position downstream from the internal tray 22 in the conveyance direction. The crimper 32′ includes a crimper movement motor 238 as a driving source. The base 48 supporting the crimping frame 32c has a fastening portion 48b for fastening the timing belt 240c at the bottom of the base 48. The driving force of the crimper movement motor 238 is transmitted to the base 48 by the drive transmission assembly 240 that includes the pullies 240a and 240b, the timing belt 240c, and the fastening portion 48b. By so doing, the crimper 32′ is moved in the main scanning direction along the surface of the sheet bundle Pb placed on the internal tray 22, in other words, along the guide rail 337. A crimper shaft 340 including a drive transmission gear 340a is fixed to a bottom face of the crimping frame 32c that holds the components of the crimper 32′.

The crimper shaft 340 and the drive transmission gear 340a are held by the base 48 on which the crimping frame 32c is disposed, so as to be rotatable in the forward and reverse directions. The drive transmission gear 340a meshes with an output gear 239a of a crimper pivot motor 239. When the driving force of the crimper pivot motor 239 is transmitted to the crimper shaft 340 via the output gear 239a and the drive transmission gear 340a, the crimper 32′ rotates in the forward and reverse directions on the base 48 about the crimper shaft 340 extending in the thickness direction of the sheet P placed on the internal tray 22. The guide rail 337, the crimper movement motor 238, the crimper pivot motor 239, the crimper shaft 340, and the drive transmission assembly 240 constitute at least part of a driving assembly of the crimper 32′ according to the present embodiment.

The crimper 32′ is movable between a standby position HP2 illustrated in FIG. 29A and a position where the crimper 32′ faces the first binding position B1 illustrated in FIGS. 29B and 29C. The standby position HP2 is away in the main scanning direction from the sheet bundle Pb placed on the internal tray 22. For example, in FIGS. 21A to 21C, the standby position HP is distanced to the right of the sheet bundle Pb along the main scanning direction. The binding position B1 is a position on the sheet bundle Pb placed on the internal tray 22. However, the specific position of the binding position B1 is not limited to the position illustrated in FIGS. 29B and 29C. The binding position B1 may be one or more positions along the main scanning direction at the downstream end, in the conveyance direction, of the sheet P.

The posture of the crimper 32′ changes between the parallel binding posture illustrated in FIG. 29B and the oblique binding posture illustrated in FIG. 29C. In other words, the crimper 32′ is rotatable in the forward and reverse directions about the crimper shaft 340. The parallel binding posture is a posture of the crimper 32′ in which the longitudinal direction of the upper crimping teeth 32a and the lower crimping teeth 32b (in other words, a rectangular crimp binding trace) is along the main scanning direction. The oblique binding posture is a posture of the crimper 32′ in which the longitudinal direction of the upper crimping teeth 32a and the lower crimping teeth 32b (i.e., the rectangular crimp binding trace) is inclined with respect to the main scanning direction.

The rotational angle, which is an angle of the upper crimping teeth 32a and the lower crimping teeth 32b with respect to the main scanning direction, in the oblique binding posture is not limited to the angle illustrated in FIG. 29C. The rotational angle in the oblique binding posture may be any angle provided that the upper crimping teeth 32a and the lower crimping teeth 32b face the sheet bundle Pb placed on the internal tray 22.

The post-processing apparatus 3A includes the liquid applier 131 and a hole punch 132 serving as a processor. The liquid applier 131 and the hole punch 132 are disposed upstream from the internal tray 22 in the opposite conveyance direction. In addition, the liquid applier 131 and the hole punch 132 are disposed at different positions in the opposite conveyance direction to simultaneously face one sheet P that is conveyed by the conveyance roller pairs 10 to 19.

The liquid applier 131 and the hole punch 132 according to the present embodiment are disposed between the conveyance roller pairs 10 and 11. However, the arrangement of the liquid applier 131 is not limited to the example of FIG. 28. For example, in a case where an inserter 6 is disposed between the image forming apparatus 2 and the post-processing apparatus 3A as illustrated in FIG. 36, the liquid applier 131 may be disposed inside the inserter 6 located upstream from the post-processing apparatus 3A in a direction in which the sheet P is conveyed from the image forming apparatus 2 to the post-processing apparatus 3A. Examples of the inserter 6 include, but are not limited to, an apparatus that allows a pre-printed medium, which is to be conveyed to the post-processing apparatus 3A together with the sheet P conveyed from the image forming apparatus 2, to be fed as a cover sheet, an insertion sheet, or a partition sheet without passing through the image forming apparatus 2. As illustrated in FIG. 31A, the conveyance roller pair 11 is located so as not to overlap, in the main scanning direction, the first liquid application position B1 on the sheet P to which the liquid has been applied by a liquid application head 146 of the liquid applier 131. This arrangement is to prevent the amount of liquid at the liquid application position B1 from decreasing due to the multiple roller pairs pressing the liquid application position B1 when the conveyance roller pair 11 conveys the sheet P. As a result, when the sheet P reaches the crimper 32′ disposed downstream from the liquid applier 131 in the opposite conveyance direction, the amount of liquid at the liquid application position B1 is sufficient to maintain the binding strength. Accordingly, the binding strength of the sheet bundle Pb is prevented from decreasing due to a decrease in the amount of liquid at the liquid application position B1 (corresponding to the binding position B1) while the sheet P is conveyed.

In addition, the multiple roller pairs of the conveyance roller pair 11 that is located so as not to overlap the liquid application position B1 on the sheet P in the main scanning direction prevents the conveying performance of the sheet P from being worse due to the adhesion of liquid to the multiple roller pairs and further prevents a conveyance jam caused by the worsened conveying performance of the sheet P.

Although only the conveyance roller pair 11 has been described above, the multiple roller pairs of the conveyance roller pairs 14 and 15 are preferably located so as not to overlap the liquid application position B1 on the sheet P in the main scanning direction, like the multiple roller pairs of the conveyance roller pair 11.

The liquid applier 131 applies liquid to the sheet P that is conveyed by the conveyance roller pairs 10 and 11. In the following description, the application of liquid may be referred to as “liquid application.” The hole punch 132 punches a hole in the sheet P that is conveyed by the conveyance roller pairs 10 and 11 such that the hole penetrates the sheet P in the thickness direction of the sheet P. The processor disposed near the liquid applier 131 is not limited to the hole punch 132. Alternatively, the processor may be an inclination corrector that corrects an inclination or skew of the sheet P that is conveyed by the conveyance roller pairs 10 and 11.

FIGS. 31A and 31B are views of the liquid applier 131 in the thickness direction of the sheet P, according to the second embodiment of the present disclosure.

FIGS. 32A, 32B, and 32C are cross-sectional views of the liquid applier 131 taken along line XXV-XXV of FIG. 31A.

FIGS. 33A, 33B, and 33C are cross-sectional views of the liquid applier 131 taken along line XXVI-XXVI of FIG. 31A.

As illustrated in FIGS. 31A to 33C, the liquid applier 131 includes a pair of guide shafts 133a and 133b, a pair of pulleys 134a and 134b, endless annular belts 135 and 136, a liquid applier movement motor 137, a standby position sensor 138, and a liquid application unit 140.

The guide shafts 133a and 133b, each extending in the main scanning direction, are spaced apart from each other in the opposite conveyance direction. The pair of guide shafts 133a and 133b are supported by a pair of side plates 4a and 4b of the post-processing apparatus 3A. The pair of guide shafts 133a and 133b support the liquid application unit 140 such that the liquid application unit 140 can move in the main scanning direction.

The pair of pulleys 134a and 134b is disposed between the pair of guide shafts 133a and 133b in the opposite conveyance direction. The pair of pulleys 134a and 134b are spaced apart from each other in the main scanning direction. The pair of pulleys 134a and 134b are supported by a frame of the post-processing apparatus 3A so as to be rotatable in the forward and reverse directions about the respective shafts extending in the thickness direction of the sheet P.

The endless annular belt 135 is looped around the pair of pulleys 134a and 134b. The endless annular belt 135 is coupled to the liquid application unit 140 by a connection 135a. The endless annular belt 136 is entrained around the pulley 134a and a driving pulley 137a that is fixed to an output shaft of the liquid applier movement motor 137. The liquid applier movement motor 137 generates a driving force to move the liquid application unit 140 in the main scanning direction.

As the liquid applier movement motor 137 rotates, the endless annular belt 136 circulates around the pulley 134a and the driving pulley 137a to rotate the pulley 134a. As the pulley 134a rotates, the endless annular belt 135 circulates around the pair of pulleys 134a and 134b. As a result, the liquid application unit 140 moves in the main scanning direction along the pair of guide shafts 133a and 133b. The liquid application unit 140 reciprocates in the main scanning direction in response to switching of the rotation direction of the liquid applier movement motor 137.

The standby position sensor 138 detects that the liquid application unit 140 has reached a standby position HP1 (see FIGS. 31A and 31B) in the main scanning direction. The standby position sensor 138 then outputs a standby position signal indicating the detection result to the controller 100b, which will be described below with reference to FIG. 34. The standby position sensor 138 is, for example, an optical sensor including a light emitter and a light receiver. The liquid application unit 140 at the standby position blocks an optical path between the light emitter and the light receiver. The standby position sensor 138 outputs the standby position signal in response to the light output from the light emitter not being received by the light receiver. The specific configuration of the standby position sensor 138 is not limited to the configuration described above.

As illustrated in FIGS. 32A to 32C, the conveyance passage inside the post-processing apparatus 3A is defined by an upper guide plate 5a and a lower guide plate 5b, which are apart from each other in the thickness direction of the sheet P. The liquid application unit 140 is located to face an opening of the upper guide plate 5a. In other words, the liquid application unit 140 is disposed to face the conveyance passage (a position at which the liquid application unit 140 is to face the sheet P conveyed along the conveyance passage) through the opening of the upper guide plate 5a.

As illustrated in FIGS. 31A to 33C, the liquid application unit 140 includes a base 141, a rotary bracket 142, a liquid storage tank 143, an application head mover 144, a holder 145, the liquid application head 146, columns 147a and 147b, a pressure plate 148, coil springs 149a and 149b, the application head pivot motor 150, the application head movement motor 151 (see FIG. 34), and a standby angle sensor 152 (see FIG. 34).

The base 141 is supported by the pair of guide shafts 133a and 133b so as to be slidable in the main scanning direction. The base 141 is coupled to the endless annular belt 135 by the connection 135a. The base 141 supports the components of the liquid application unit 140 such as the rotary bracket 142, the liquid storage tank 143, the application head mover 144, the holder 145, the liquid application head 146, the columns 147a and 147b, the pressure plate 148, the coil springs 149a and 149b, the application head pivot motor 150, the application head movement motor 151, and the standby angle sensor 152.

The rotary bracket 142 is attached to the lower face of the base 141 so as to be rotatable in the forward and reverse directions about an axis extending in the thickness direction of the sheet P. The rotary bracket 142 is rotated with respect to the base 141 by a driving force transmitted from the application head pivot motor 150. The rotary bracket 142 retains the liquid storage tank 143, the application head mover 144, the holder 145, the liquid application head 146, the columns 147a and 147b, the pressure plate 148, and the coil springs 149a and 149b.

The standby angle sensor 152, which is also illustrated in FIG. 34, detects that the rotary bracket 142 has reached a standby angle. The standby angle sensor 152 then outputs a standby angle signal indicating the detection result to the controller 100b. The standby angle is, for example, an angle for the parallel binding. The standby angle sensor 152 is, for example, an optical sensor including a light emitter and a light receiver. The rotary bracket 142 at the standby angle blocks an optical path between the light emitter and the light receiver. The standby angle sensor 152 outputs the standby angle signal in response to the light output from the light emitter not being received by the light receiver. The specific configuration of the standby angle sensor 152 is not limited to the configuration described above.

FIG. 31A illustrates the rotary bracket 142 in a position for the parallel binding that is performed by the crimper 32′ disposed downstream from the liquid applier 131 in a direction in which the sheet P is conveyed.

FIG. 31B illustrates the rotary bracket 142 in a position for the oblique binding (i.e., corner binding) that is performed by the crimper 32′ disposed downstream from the liquid applier 131 in the direction in which the sheet P is conveyed.

The liquid storage tank 143 stores liquid to be applied to the sheet P. The application head mover 144 is attached by the liquid storage tank 143 so as to be movable (e.g., up and down) in the thickness direction of the sheet P. The application head mover 144 is moved with respect to the liquid storage tank 143 by a driving force transmitted from the application head movement motor 151. The holder 145 is attached to a lower end of the application head mover 144. The liquid application head 146 projects from the holder 145 toward the conveyance passage (downward in the present embodiment). The liquid that is stored in the liquid storage tank 143 is supplied to the liquid application head 146. The liquid application head 146 is made of a material having a relatively high liquid absorption (e.g., sponge or fiber).

The columns 147a and 147b project downward from the holder 145 around the liquid application head 146. The columns 147a and 147b are movable relative to the holder 145 in the thickness direction. The columns 147a and 147b have respective lower ends holding the pressure plate 148. The pressure plate 148 has a through hole 148a at a position where the through hole 148a faces the liquid application head 146. The coil springs 149a and 149b are fitted around the columns 147a and 147b, respectively, between the holder 145 and the pressure plate 148. The coil springs 149a and 149b bias the columns 147a and 147b and the pressure plate 148 in a direction away from the holder 145.

As illustrated in FIGS. 32A and 33A, before the sheet P is conveyed to the position where the sheet P faces the opening of the upper guide plate 5a, the pressure plate 148 is positioned at or above the opening. Subsequently, when the sheet P that is conveyed by the conveyance roller pairs 10 and 11 stops at a position where the liquid application position B1 on the sheet P faces the opening, the application head movement motor 151 is rotated in a first direction. As a result, the application head mover 144, the holder 145, the liquid application head 146, the columns 147a and 147b, the pressure plate 148, and the coil springs 149a and 149b are moved down together to allow the pressure plate 148 to contact the sheet P. The liquid application position B1 corresponds to the binding position B1 to be crimped and bound by the edge binder 251, specifically, the crimper 32′.

As the application head movement motor 151 keeps rotating in the first direction after the pressure plate 148 contacts the sheet P, the coil springs 149a and 149b are compressed to further move down the application head mover 144, the holder 145, the liquid application head 146, and the columns 147a and 147b. As a result, as illustrated in FIGS. 32B and 33B, a lower face of the liquid application head 146 contacts the sheet P through the through hole 148a. As a result, the liquid contained in the liquid application head 146 is applied to the sheet P.

Further rotation of the application head movement motor 151 in the first direction further strongly presses the liquid application head 146 against the sheet P as illustrated in FIGS. 32C and 33C. Accordingly, the amount of liquid that is applied to the sheet P increases. In other words, the liquid applier 131 changes the pressing force of the liquid application head 146 against the sheet P to adjust the amount of liquid that is applied to the sheet P.

On the other hand, the rotation of the application head movement motor 151 in the second direction opposite to the first direction moves up the application head mover 144, the holder 145, the liquid application head 146, the columns 147a and 147b, the pressure plate 148, and the coil springs 149a and 149b together. As a result, as illustrated in FIGS. 32A and 33A, the liquid application head 146 and the pressure plate 148 are separated from the sheet P. In other words, the liquid applier 131 includes the liquid application head 146 that can be separated from the sheet P.

FIG. 34 is a block diagram illustrating a hardware configuration of the control block of the post-processing apparatus 3A to control the operation of the post-processing apparatus 3A according to the second embodiment of the present disclosure.

As illustrated in FIG. 34, the post-processing apparatus 3A includes a central processing unit (CPU) 101, a random access memory (RAM) 102, a read only memory (ROM) 103, a hard disk drive (HDD) 104, and an interface (I/F) 105. The CPU 101, the RAM 102, the ROM 103, the HDD 104, and the I/F 105 are connected to each other via a common bus 109.

The CPU 101 is an arithmetic unit and controls the overall operation of the post-processing apparatus 3A.

The RAM 102 is a volatile storage medium that allows data to be read and written at high speed. The CPU 101 uses the RAM 102 as a work area for data processing.

The ROM 103 is a read-only non-volatile storage medium that stores programs such as firmware.

By an arithmetic function of the CPU 101, the post-processing apparatus 3A processes, for example, a control program stored in the ROM 103 and an information processing program (application program) loaded into the RAM 102 from a storage medium such as the HDD 104. Such processing configures a software controller including various functional modules of the post-processing apparatus 3A. The software controller thus configured cooperates with hardware resources of the post-processing apparatus 3A to construct functional blocks that implement functions of the post-processing apparatus 3A. In other words, the CPU 101, the RAM 102, the ROM 103, the HDD 104, and the I/F 105 constitute at least part of a controller 100b serving as a control device that controls the operation of the post-processing apparatus 3A.

The I/F 105 is an interface that connects the conveyance roller pairs 10, 11, 14, and 15, the switching member 20, the side fences 24L and 24R, the crimper movement motor 238, the crimper pivot motor 239, a contact-separation motor 32d, a liquid applier movement motor 137, an application head pivot motor 150, an application head movement motor 151, a standby position sensor 138, a standby angle sensor 152, a hole punch 132, and a control panel 110 to the common bus 109.

The controller 100b controls, via the I/F 105, the operations of the conveyance roller pairs 10, 11, 14, and 15, the switching member 20, the side fences 24L and 24R, the crimper movement motor 238, the crimper pivot motor 239, the contact-separation motor 32d, the liquid applier movement motor 137, the application head pivot motor 150, the application head movement motor 151, and the hole punch 132. The controller 100b acquires detection results from the standby position sensor 138 and the standby angle sensor 152 through the I/F 105.

Although FIG. 34 illustrates the components of the liquid applier 131 and the edge binder 251 (the crimper 32′) that executes the edge binding, the components of the saddle binder 28 that executes the saddle binding are controlled by the controller 100b like the components of the liquid applier 131 and the edge binder 251 (the crimper 32′) that executes the edge binding.

As illustrated in FIG. 36, the image forming apparatus 2 includes the control panel 110. The control panel 110 includes an operating device that receives instructions input by a user and a display serving as a notifier that notifies the user of information. The control panel 110 includes, for example, physical input buttons and a touch screen overlaid on a display. The control panel 110 acquires information from the user through the operation unit and provides the information to the user through the display. The post-processing apparatus 3A may include a control panel 110 similar to the above-described control panel 110 of the image forming apparatus 2.

FIG. 35 is a flowchart of post-processing performed by the post-processing apparatus 3A according to the second embodiment.

Specifically, FIG. 35 is a flowchart of a process to execute the one-point binding illustrated in FIGS. 29A to 29D.

For example, the controller 100b executes the post-processing illustrated in FIG. 35 when the controller 100b acquires an instruction to execute the post-processing from the image forming apparatus 2. In the following description, the instruction to execute the post-processing may be referred to as a “post-processing command.” The post-processing command includes, for example, the number of sheets P of the sheet bundle Pb (referred to as “given number of sheet Np”), the number of sheet bundles Pb to be subjected to binding process (referred to as “requested number of copies Mp”), the binding position B1 (corresponding to the liquid application position B1), the angle of the binding position B1 (corresponding to the angle of the liquid application position B1), the type of binding process (parallel binding process or oblique binding process), and a process that is executed in parallel with the liquid application process (i.e., punching a hole in the present embodiment). At the start of the post-processing, the liquid application unit 140 is at the standby position HP1 illustrated in FIGS. 31A to 31C whereas the rotary bracket 142 is held at the standby angle (corresponding to the parallel binding posture).

First, in step S801, the controller 100b drives the liquid applier movement motor 137 to move the liquid application unit 140 (corresponding to a liquid applier) in the main scanning direction such that a liquid application head 146 moves from the standby position HP1 to a position where the liquid application head 146 can face the liquid application position B1 (see FIG. 31B, the position corresponding to the binding position B1 illustrated in FIGS. 29A to 29C). (skip) If the type of the binding process instructed by the post-processing command is “oblique binding process,” in step S801, the controller 100b drives the application head pivot motor 150 to rotate the rotary bracket 142. Thus, the liquid application head 146 is rotated from the standby angle to the liquid application angle corresponding to the “oblique binding posture.” It is ascertained, based on a pulse signal output from a rotary encoder of the liquid applier movement motor 137, that the liquid application head 146 has reached the position where the liquid application head 146 can face the liquid application position B1. Similarly, it is ascertained, based on a pulse signal output from a rotary encoder of the application head pivot motor 150, that the liquid application head 146 has reached the liquid application angle. If the type of the binding process instructed by the post-processing command is “parallel binding process”, the controller 100b omits the above-described operation of rotating the rotary bracket 142. In other words, the liquid application unit 140 moves in the main scanning direction while holding the rotary bracket 142 at the standby angle.

Further, in step S801, the controller 100b drives the crimper movement motor 238 to move the crimper 32′ from the standby position HP2 to the position where the crimper 32′ can face the binding position B1 as illustrated in FIGS. 29A and 29B. Alternatively, if the type of the binding process instructed by the post-processing command is “oblique binding process,” in step S801, the controller 100b drives the crimper pivot motor 239 to rotate the crimper 32′ from the standby angle to the crimping angle corresponding to the “oblique binding posture.” It is ascertained, based on a pulse signal output from a rotary encoder of the crimper movement motor 238, that the crimper 32′ has reached the position where the crimper 32′ can face the binding position B1. Similarly, it is ascertained, based on a pulse signal output from a rotary encoder of the crimper pivot motor 239, that the crimper 32′ has reached the crimping angle. If the type of the binding process instructed by the post-processing command is “parallel binding process,” the controller 100b omits the above-described operation of rotating the crimper 32′. In other words, the crimper 32′ moves in the main scanning direction while maintaining the standby angle.

Subsequently, in step S802, the controller 100b drives the conveyance roller pairs 10 and 11 to start conveying the sheet P on which an image is formed by the image forming apparatus 2. The controller 100b determines whether the liquid application position B1 on the sheet P faces first the liquid application unit 140 (more specifically, the liquid application head 146) (step S803). In other words, the controller 100b determines whether the liquid application unit 140 has faced the first liquid application position B1 on the sheet P. When the liquid application position B1 on the sheet P has not faced the liquid application head 146 (NO in step S803), the controller 100b repeats the determination in step S803. In other words, the controller 100b continues driving the conveyance roller pairs 10 and 11 until the first liquid application position B1 on the sheet P faces the liquid application head 146. The controller 100b determines whether the liquid application position B1 on the sheet P has faced the liquid application unit 140 (more specifically, the liquid application head 146) (step S803). In other words, the controller 100b determines whether the liquid application unit 140 has faced the liquid application position B1 on the sheet P. When the liquid application position B1 on the sheet P has not faced the liquid application head 146 (NO in step S803), the controller 100b repeats the determination in step S803. In other words, the controller 100b continues driving the conveyance roller pairs 10 and 11 until the liquid application position B1 on the sheet P faces the liquid application head 146. When the controller 100b determines that the liquid application position B1 on the sheet P has faced the liquid application head 146 (YES in step S803), the controller 100b causes the conveyance roller pairs 10 and 11 (step S804) to stop conveying the sheet P. It is ascertained, based on a pulse signal output from a rotary encoder of a motor that drives the conveyance roller pairs 10 and 11, that the liquid application position B1 on the sheet P has faced the liquid application head 146.

The controller 100b causes the liquid application unit 140 to execute the process of applying liquid to the liquid application position B1 on the sheet P (step S805). More specifically, the controller 100b rotates the application head movement motor 151 in the first direction to bring the liquid application head 146 into contact with the liquid application position B1 on the sheet P. The controller 100b changes the pressing force of the liquid application head 146 (i.e., the amount of rotation or rotation speed of the application head movement motor 151) depending on the amount of liquid to be applied to the sheet P.

The amount of liquid that is applied to the sheet P may be the same for all the sheets P of the sheet bundle Pb or may be different for each sheet P. For example, the controller 100b may decrease the amount of liquid applied to a sheet P conveyed later. The amount of rotation of the application head movement motor 151 may be ascertained based on a pulse signal outputted from a rotary encoder of the application head movement motor 151.

In step S806, the controller 100b drives the conveyance roller pairs 10, 11, 14, and 15 to place a sheet P on the internal tray 22. The controller 100b moves the side fences 24L and 24R to align the position of the sheet P or the sheet bundle Pb placed on the internal tray 22 in the main scanning direction (step S806). In short, the controller 100b performs so-called jogging.

The controller 100b determines whether the number of sheets P placed on the internal tray 22 has reached the given number of sheets Np indicated by the post-processing command (step S807). When the controller 100b determines that the number of sheets P placed on the internal tray 22 has not reached the given number of sheets Np (NO in step S807), the controller 100b executes the operations of steps S802 and S803 again until the number of sheets P placed on the internal tray 22 reaches the given number of sheets Np (YES in step S807).

By contrast, when the controller 100b determines that the number of sheets P that are placed on the internal tray 22 has reached the given number of sheets Np (YES in step S807), the controller 100b causes the crimper 32′ to crimp the binding position B1 (corresponding to the liquid application position B1) on the sheet bundle Pb to which the liquid has been applied by the liquid application unit 140 (step S808). In addition, in step S808, the controller 100b rotates the conveyance roller pair 15 to eject the crimped sheet bundle Pb to the ejection tray 26.

The controller 100b determines whether the number of sheet bundles Pb thus ejected to the ejection tray 26 has reached the requested number of copies Mp indicated by the post-processing command (step S809). When the controller 100b determines that the number of the sheet bundles Pb ejected to the ejection tray 26 has not reached the requested number of copies Mp (NO in step S809), the controller 100b repeats the processing of steps S802 to S809 until the number of the sheet bundles Pb ejected to the ejection tray 26 reaches the requested number of copies Mp (YES in step S809).

When the controller 100b determines that the number of sheet bundles Pb ejected to the ejection tray 26 reaches the requested number of copies Mp (YES in step S809), the controller 100b drives the liquid applier movement motor 137 to move the liquid application unit 140 to the standby position HP1 (see FIG. 31) and drives the crimper movement motor 238 to move the crimper 32′ to the standby position HP2 (see FIG. 29) (step S810). When the posture that is instructed by the post-processing operation is the “oblique binding posture,” the controller 100b drives the application head pivot motor 150 and the crimper pivot motor 239 to rotate the liquid application unit 140 and crimper 32′ and the parallel binding posture (standby angle) into the parallel binding posture (step S810). By contrast, when the posture that is instructed by the post-processing operation is the “parallel binding posture,” the controller 100b skips the aforementioned operation of rotating the liquid application unit 140 and the crimper 32′ to the parallel binding posture (standby angle). In steps S801 and S810, the execution order of the movement in the main scanning direction and the rotation in the forward and reverse directions of the liquid application unit 140 and the crimper 32′ is not limited to the aforementioned order and may be reversed.

The embodiments of the present disclosure are applied to the edge binder 25 that executes the edge binding as described above. However, the embodiments of the present disclosure may be applied to the saddle binder 28 that executes the saddle binding.

The controller 100b of the post-processing apparatus 3A according to the second embodiment illustrated in FIG. 28 is provided separately from the controller 100a of the image forming apparatus 2 as in the configuration of FIG. 1. However, embodiments of the present disclosure are not limited to the above-described configuration. For example, as illustrated in FIG. 37A, the controller 100b of the post-processing apparatus 3A may be disposed in the image forming apparatus 2. Further, as in the configuration of FIG. 37B, the controller 100b of the post-processing apparatus 3A may be integrated with the controller 100a of the image forming apparatus 2.

As in the configuration of FIG. 38A, the controller 100b of the post-processing apparatus 3A may be divided into a controller 100b1 (e.g., a driver system such as a motor) and a controller 100b2 (a detector such as a sensor) according to the function, and the controller 100b2 of the post-processing apparatus 3A may be disposed in the image forming apparatus 2. Further, as in the configuration of FIG. 38B, the controller 100b2 of the post-processing apparatus 3A disposed in the image forming apparatus 2 may be integrated with the controller 100a of the image forming apparatus 2.

As described above, the control method by the controller 100b described above is implemented by cooperation between hardware resources of a computer and a program as computer software. In other words, the control method may be executed by causing an arithmetic device, a storage device, an input device, an output device, and a control device to operate in cooperation with each other based on a program. In addition, the program may be written in, for example, a storage device or a storage medium and distributed, or may be distributed through, for example, an electric communication line.

Embodiments of the present disclosure are not limited to the above-described embodiments, and numerous additional modifications and variations are possible in light of the teachings within the technical scope of the appended claims. It is therefore to be understood that the above-described embodiments of the present disclosure may be practiced otherwise by those skilled in the art than as specifically described herein. Such embodiments and variations thereof are included in the scope and gist of the embodiments of the present disclosure and are included in the embodiments described in claims and the equivalent scope thereof.

Aspects of the Present Disclosure

Aspects of the present disclosure are, for example, as follows.

Aspect 1

In Aspect 1, a medium processing apparatus (for example, the post-processing apparatus 3) includes a liquid applier (for example, the liquid applier 31), a first liquid storage (for example, the first liquid storage tank 44), a second liquid storage (for example, the second liquid storage tank 47, the second liquid storage tank fixer 61), and a liquid flow passage (for example, the liquid supply passage 45). The liquid application member performs liquid application on a sheet (for example, the sheet P) on which a given process is performed after the liquid application. The first liquid storage stores liquid to be supplied by the liquid applier. The second liquid storage stores the liquid to be supplied to the first liquid storage. The liquid flow passage is coupled to each of the first liquid storage and the second liquid storage. The liquid flow passage includes a liquid leakage detector (for example, the first leakage sensor 81, the second leakage sensor 82) to detect leakage of the liquid, and a liquid flow limiter (for example, the first on-off valve 811, the second on-off valve 821) to limit a flow of the liquid when the leakage of the liquid is detected.

Aspect 2

In Aspect 2, in the medium processing apparatus according to Aspect 1, the liquid flow limiter includes a first liquid flow limiter (for example, the first on-off valve 811) disposed close to a side on which the liquid flow passage and the first liquid storage are coupled, and a second liquid flow limiter (for example, the second on-off valve 821) disposed close to a side on which the liquid flow passage and the second liquid storage are coupled. When a detection position of the leakage of the liquid in the liquid leakage detector is on a first coupling side of the liquid flow passage and the first liquid storage, the first liquid flow limiter blocks a flow of the liquid and the second liquid flow limiter allows the liquid to flow. When a detection position of the leakage of the liquid in the liquid leakage detector is on a second coupling side of the liquid flow passage and the second liquid storage, the second liquid flow limiter blocks the flow of the liquid and the first liquid flow limiter allows the liquid to flow.

Aspect 3

In Aspect 3, in the medium processing apparatus according to Aspect 2 further includes a coupler (for example, the first coupler 91, the second coupler 92) to couple the liquid flow passage and each of the first liquid storage and the second liquid storage, and a liquid absorber (for example, the liquid absorption member 911) wound around the coupler to absorb the liquid.

Aspect 4

In Aspect 4, in the medium processing apparatus according to Aspect 2 further includes a coupler (for example, the first coupler 91, the second coupler 92) to couple the liquid flow passage and each of the first liquid storage and the second liquid storage, and a liquid absorber (for example, the liquid absorption member 911) that is disposed below the coupler to absorb the liquid.

Aspect 5

In Aspect 5, in the medium processing apparatus according to Aspect 1 further includes a coupler (for example, the first coupler 91, the second coupler 92) to couple the liquid flow passage and each of the first liquid storage and the second liquid storage, and a liquid absorber (for example, the liquid absorption member 911) wound around the coupler to absorb the liquid.

Aspect 6

In Aspect 6, in the medium processing apparatus according to Aspect 1 further includes a coupler (for example, the first coupler 91, the second coupler 92) to couple the liquid flow passage and each of the first liquid storage and the second liquid storage, and a liquid absorber (for example, the liquid absorption member 911) that is disposed below the coupler to absorb the liquid.

Aspect 7

In Aspect 7, in the medium processing apparatus according to any one of Aspects 1 to 6, the liquid leakage detector includes an electrode sensor (for example, the first liquid amount detection sensor 43, the second liquid amount detection sensor 94).

Aspect 8

In Aspect 8, in the medium processing apparatus according to any one of Aspects 1 to 7 further includes a coupler (for example, the first coupler 91, the second coupler 92) to couple the liquid flow passage and each of the first liquid storage and the second liquid storage, and a third liquid storage (for example, the in-sensor liquid storage 912) below the coupler. The liquid leakage detector is an electrode sensor to detect an amount of the liquid in the third liquid storage.

Aspect 9

In Aspect 9, in the medium processing apparatus according to any one of Aspects 1 to 8, the liquid application member performs the liquid application while being in contact with the medium.

Aspect 10

In Aspect 10, in the medium processing apparatus according to any one of Aspects 1 to 9 further includes a post-processing device (for example, the crimper 32) to perform the given process. The post-processing device includes a crimper to bind a bundle of media by pressing and deforming the bundle of media.

Aspect 11

In Aspect 11, an image forming system (for example, the image forming system 1) includes an image forming apparatus (for example, the image forming apparatus 2) and the medium processing apparatus (for example, the post-processing apparatus 3) according to any one of Aspects 1 to 10. The image forming apparatus forms an image on a medium (for example, the sheet P). The medium processing apparatus performs the process on a bundle of media (for example, the sheet bundle Pb) including the medium on which the image is formed by the image forming apparatus.

Aspect 12

In Aspect 12, a medium processing apparatus (for example, the post-processing apparatus 3) includes a liquid applier (for example, the liquid applier 31), a first liquid storage (for example, the first liquid storage tank 44), a second liquid storage (for example, the second liquid storage tank 47, the second liquid storage tank fixer 61), a liquid flow passage (for example, the liquid supply passage 45), a liquid leakage detector (for example, the first leakage sensor 81, the second leakage sensor 82), and a liquid flow limiter (for example, the first on-off valve 811, the second on-off valve 821). The liquid applier applies a liquid on a sheet (for example, the sheet P) on which a given process is to be performed. The first liquid storage stores the liquid to be supplied to the liquid applier. The second liquid storage stores the liquid to be supplied to the first liquid storage. The liquid flow passage connects the first liquid storage and the second liquid storage. The liquid leakage detector detects leakage of the liquid from at least one of the first liquid storage or the second liquid storage. The liquid flow limiter limits a flow of the liquid from at least one of the first liquid storage or the second liquid storage in response to a detection of the leakage by the liquid leakage detector.

Aspect 13

In Aspect 13, the medium processing apparatus according to Aspect 12 further includes a first coupler (for example, the first coupler 91) and a second coupler (for example, the second coupler 92). The first coupler couples the first liquid storage (for example, the first liquid storage 44) and the liquid flow passage (for example, the liquid supply passage 45). The second coupler couples the second liquid storage (for example, the second liquid storage tank 47, the second liquid storage tank fixer 61) and the liquid flow passage. The liquid leakage detector (for example, the first leakage sensor 81, the second leakage sensor 82) includes a first leakage detector (for example, the first leakage sensor 81) and a second leakage detector (for example, the second leakage sensor 82). The first leakage detector detects leakage of the liquid from the first liquid storage. The second leakage detector detects leakage of the liquid from the second liquid storage. The liquid flow limiter includes a first flow limiter (for example, the first on-off valve 811) and a second flow limiter (for example, the second on-off valve 821). The first flow limiter closes the first coupler in response to the detection of the leakage by the first leakage detector. The second flow limiter closes the second coupler in response to the detection of the leakage by the second leakage detector.

Aspect 14

In Aspect 14, the medium processing apparatus according to Aspect 13 further includes circuitry (for example, the controller 100b) is to cause the first flow limiter (for example, the first on-off valve 811) to close the first coupler and cause the second flow limiter to open the second coupler in response to the detection of the leakage by the first leakage detector, and cause the second flow limiter (for example, the second on-off valve 821) to close the second coupler and cause the first flow limiter to open the first coupler in response to the detection of the leakage by the second leakage detector.

Aspect 15

In Aspect 15, in the medium processing apparatus according to Aspect 13, at least one of the first coupler (for example, the first coupler 91) and the second coupler (for example, the second coupler 92) includes a liquid absorber (for example, the liquid absorption member 911) wound around the at least one of the first coupler or the second coupler to absorb the liquid.

Aspect 16

In Aspect 16, in the medium processing apparatus according to Aspect 13 further includes a liquid absorber (for example, the liquid absorption member 911). The liquid absorber is disposed below at least one of the first coupler (for example, the first coupler 91) or the second coupler (for example, the second coupler 92) to absorb the liquid leaked from the at least one of the first coupler or the second coupler.

Aspect 17

In Aspect 17, in the medium processing apparatus according to any one of Aspects 12 to 16, the liquid leakage detector (for example, the first leakage sensor 81, the second leakage sensor 82) includes an electrode sensor (for example, the first liquid amount detection sensor 43, the second liquid amount detection sensor 94).

Aspect 18

In Aspect 18, the medium processing apparatus according to any one of Aspects 13 to 17 further includes a third liquid storage (for example, the in-sensor liquid storage 912) disposed below at least one of the first coupler (for example, the first coupler 91) or the second coupler (for example, the second coupler 92). The liquid leakage detector (for example, the first leakage sensor 81, the second leakage sensor 82) includes an electrode sensor to detect an amount of the liquid in the third liquid storage (for example, the in-sensor liquid storage 912).

Aspect 19

In Aspect 19, in the medium processing apparatus according to any one of Aspects 12 to 18, the liquid applier (for example, the liquid applier 31) contacts the medium (for example, the sheet P) to apply liquid to the medium.

Aspect 20

In Aspect 20, in the medium processing apparatus according to any one of Aspects 12 to 19 further includes a post-processing device (for example, the crimper 32) to perform the given process. The post-processing device includes a crimper to bind a bundle of media (for example, the sheet bundle Pb) by pressing and deforming the bundle of media.

Aspect 21

In Aspect 21, an image forming system (for example, the image forming system 1) includes an image forming apparatus (for example, the image forming apparatus 2) and the medium processing apparatus (for example, the post-processing apparatus 3) according to any one of Aspects 12 to 20. The image forming apparatus forms an image on a medium (for example, the sheet P). The medium processing apparatus performs the process on a bundle of media (for example, the sheet bundle Pb) including the medium on which the image is formed by the image forming apparatus.

The present disclosure is not limited to specific embodiments described above, and numerous additional modifications and variations are possible in light of the teachings within the technical scope of the appended claims. It is therefore to be understood that, the disclosure of this patent specification may be practiced otherwise by those skilled in the art than as specifically described herein, and such, modifications, alternatives are within the technical scope of the appended claims. Such embodiments and variations thereof are included in the scope and gist of the embodiments of the present disclosure and are included in the embodiments described in claims and the equivalent scope thereof.

The effects described in the embodiments of this disclosure are listed as the examples of preferable effects derived from this disclosure, and therefore are not intended to limit to the embodiments of this disclosure.

The embodiments described above are presented as an example to implement this disclosure. The embodiments described above are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, or changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of this disclosure and are included in the scope of the invention recited in the claims and its equivalent.

Any one of the above-described operations may be performed in various other ways, for example, in an order different from the one described above.

Each of the functions of the described embodiments may be implemented by one or more processing circuits or circuitry. Processing circuitry includes a programmed processor, as a processor includes circuitry. A processing circuit also includes devices such as an application specific integrated circuit (ASIC), digital signal processor (DSP), field programmable gate array (FPGA), and conventional circuit components arranged to perform the recited functions.

Number	Date	Country	Kind
2023-046990	Mar 2023	JP	national
2024-017972	Feb 2024	JP	national

MEDIUM PROCESSING APPARATUS AND IMAGE FORMING SYSTEM INCORPORATING SAME

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