JP-2026076021-A - Sheet processing device and image forming system

JP2026076021AJP 2026076021 AJP2026076021 AJP 2026076021AJP-2026076021-A

Abstract

[Problem] To provide a sheet processing device and an image forming system that suppress sheet skew when shifting and aligning sheets in a mode that performs corner binding on a stack of sheets on a processing tray. [Solution] In the corner binding mode, there are sheets that undergo shift alignment, where the sheets are shifted one by one on the processing tray to align them. Among the sheets that require shift alignment, there are first sheets that do not come off the rear end restricting members on both sides in the width direction when the sheet is shifted, and second sheets that partially come off. In the case of the first sheet, the sheet is shifted while being gripped with a first gripping force by the knurled belt, which forces the rear end of the first sheet against the rear end restricting member. In the case of the second sheet, the sheet is shifted while being gripped with a second gripping force weaker than the first gripping force by the knurled belt, or without gripping at all, thereby suppressing the skew of the sheet during shifting. [Selection Diagram] Figure 16

Inventors

久保守
青木翔
望月敬史

Assignees

キヤノンファインテックニスカ株式会社

Dates

Publication Date: 20260511
Application Date: 20241023

Claims (4)

A first conveying unit that conveys the sheet in a first conveying direction, A mounting section for placing the sheet transported by the first transport section, The abutting portion against which the upstream edge of the sheet on the mounting portion in the first transport direction abuts, A second conveying unit that conveys the sheet in a second conveying direction, such that the upstream edge of the sheet on the mounting unit in the first conveying direction is toward the abutment unit, With respect to the width direction of the sheet intersecting the first transport direction, a first alignment plate and a second alignment plate are provided, which are positioned on both sides of the sheet abutting against the abutting portion and which contact both end edges of the sheet in the width direction abutting against the abutting portion to perform alignment processing on the sheet in the width direction, A binding processing unit that performs a binding process on a sheet bundle consisting of multiple sheets formed on the aforementioned mounting unit after the alignment process has been performed, A stacking section for stacking the sheet bundles that have undergone the binding process, A discharge unit for discharging the sheet bundle to the loading section, The system comprises the second transport unit, the first alignment plate, and a control unit that controls the second alignment plate and the binding processing unit, Multiple abutment portions are provided in the width direction. When performing corner binding on the corner portion of the sheet bundle, the control unit moves to the second alignment plate side, which is in a more aligned position than the abutment portion in the width direction, and with the second alignment plate waiting in the aligned position, it performs shift alignment to align the sheet bundle by repeatedly shifting the sheet placed on the aforementioned placement portion in the shift direction toward the second alignment plate using the first alignment plate and then aligning it, and can then perform corner binding on the shift-aligned sheet bundle. When shifting a first sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located upstream in the shift direction of the shift direction of the abutment member furthest upstream in the shift direction, and the length in the second transport direction is longer than the length of the sheet in the width direction, the first alignment plate shifts the sheet in the shift direction while the second transport unit applies a force toward the abutment portion to the sheet with the first transport force, When shift-aligning a second sheet in the shift-aligned state, where the edge of the sheet on the first alignment plate side is located downstream in the shift direction of the abutment member furthest upstream in the shift direction, the first alignment plate shifts the sheet in the shift direction while applying a force toward the abutment member to the sheet with a second conveying force weaker than the first conveying force using the second conveying unit. A sheet processing apparatus characterized by the following:
An image forming unit that forms an image on a sheet, A first transport unit transports the sheet on which the image has been formed by the image forming unit in a first transport direction, A mounting section for placing the sheet transported by the first transport section, The abutting portion against which the upstream edge of the sheet on the mounting portion in the first transport direction abuts, A second conveying unit that conveys the sheet in a second conveying direction, such that the upstream edge of the sheet on the mounting unit in the first conveying direction is toward the abutment unit, With respect to the width direction of the sheet intersecting the first transport direction, a first alignment plate and a second alignment plate are provided, which are positioned on both sides of the sheet abutting against the abutting portion and which contact both end edges of the sheet in the width direction abutting against the abutting portion to perform alignment processing on the sheet in the width direction, A binding processing unit that performs a binding process on a sheet bundle consisting of multiple sheets formed on the aforementioned mounting unit after the alignment process has been performed, A stacking section for stacking the sheet bundles that have undergone the binding process, A discharge unit for discharging the sheet bundle to the loading section, The system comprises the second transport unit, the first alignment plate, and a control unit that controls the second alignment plate and the binding processing unit, Multiple abutment portions are provided in the width direction. When performing corner binding on the corner portion of the sheet bundle, the control unit moves to the second alignment plate side, which is in a more aligned position than the abutment portion in the width direction, and with the second alignment plate waiting in the aligned position, it performs shift alignment to align the sheet bundle by repeatedly shifting the sheet placed on the aforementioned placement portion in the shift direction toward the second alignment plate using the first alignment plate and then aligning it, and can then perform corner binding on the shift-aligned sheet bundle. When shifting a first sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located upstream in the shift direction of the shift direction of the abutment member furthest upstream in the shift direction, and the length in the second transport direction is longer than the length of the sheet in the width direction, the first alignment plate shifts the sheet in the shift direction while the second transport unit applies a force toward the abutment portion to the sheet with the first transport force, When shift-aligning a second sheet in the shift-aligned state, where the edge of the sheet on the first alignment plate side is located downstream in the shift direction of the abutment member furthest upstream in the shift direction, the first alignment plate shifts the sheet in the shift direction while applying a force toward the abutment member to the sheet with a second conveying force weaker than the first conveying force using the second conveying unit. An image forming system characterized by the following features.
A first conveying unit that conveys the sheet in a first conveying direction, A mounting section for placing the sheet transported by the first transport section, The abutting portion against which the upstream edge of the sheet on the mounting portion in the first transport direction abuts, A second conveying unit that conveys the sheet in a second conveying direction, such that the upstream edge of the sheet on the mounting unit in the first conveying direction is toward the abutment unit, With respect to the width direction of the sheet intersecting the first transport direction, a first alignment plate and a second alignment plate are provided, which are positioned on both sides of the sheet abutting against the abutting portion and which contact both end edges of the sheet in the width direction abutting against the abutting portion to perform alignment processing on the sheet in the width direction, A binding processing unit that performs a binding process on a sheet bundle consisting of multiple sheets formed on the aforementioned mounting unit after the alignment process has been performed, A stacking section for stacking the sheet bundles that have undergone the binding process, A discharge unit for discharging the sheet bundle to the loading section, The system comprises the second transport unit, the first alignment plate, and a control unit that controls the second alignment plate and the binding processing unit, Multiple abutment portions are provided in the width direction. When performing corner binding on the corner portion of the sheet bundle, the control unit moves to the second alignment plate side, which is in a more aligned position than the abutment portion in the width direction, and with the second alignment plate waiting in the aligned position, it performs shift alignment to align the sheet bundle by repeatedly shifting the sheet placed on the aforementioned placement portion in the shift direction toward the second alignment plate using the first alignment plate and then aligning it, and can then perform corner binding on the shift-aligned sheet bundle. When shifting a first sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located upstream in the shift direction from the downstream end of the abutment member furthest upstream in the shift direction, and the length in the second transport direction is longer than the length of the sheet in the width direction, the first alignment plate shifts the sheet in the shift direction while applying a force toward the abutment portion to the sheet by the second transport unit. When shifting a second sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located downstream in the shift direction from the downstream end in the shift direction of the abutment member furthest upstream in the shift direction, the first alignment plate shifts the sheet in the shift direction without applying a force toward the abutment portion by the second transport unit to the sheet. A sheet processing apparatus characterized by the following:
An image forming unit that forms an image on a sheet, A first transport unit transports the sheet on which the image has been formed by the image forming unit in a first transport direction, A mounting section for placing the sheet transported by the first transport section, The abutting portion against which the upstream edge of the sheet on the mounting portion in the first transport direction abuts, A second conveying unit that conveys the sheet in a second conveying direction, such that the upstream edge of the sheet on the mounting unit in the first conveying direction is toward the abutment unit, With respect to the width direction of the sheet intersecting the first transport direction, a first alignment plate and a second alignment plate are provided, which are positioned on both sides of the sheet abutting against the abutting portion and which contact both end edges of the sheet in the width direction abutting against the abutting portion to perform alignment processing on the sheet in the width direction, A binding processing unit that performs a binding process on a sheet bundle consisting of multiple sheets formed on the aforementioned mounting unit after the alignment process has been performed, A stacking section for stacking the sheet bundles that have undergone the binding process, A discharge unit for discharging the sheet bundle to the loading section, The system comprises the second transport unit, the first alignment plate, and a control unit that controls the second alignment plate and the binding processing unit, Multiple abutment portions are provided in the width direction. When performing corner binding on the corner portion of the sheet bundle, the control unit moves to the second alignment plate side, which is in a more aligned position than the abutment portion in the width direction, and with the second alignment plate waiting in the aligned position, it performs shift alignment to align the sheet bundle by repeatedly shifting the sheet placed on the aforementioned placement portion in the shift direction toward the second alignment plate using the first alignment plate and then aligning it, and can then perform corner binding on the shift-aligned sheet bundle. When shifting a first sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located upstream in the shift direction from the downstream end of the abutment member furthest upstream in the shift direction, and the length in the second transport direction is longer than the length of the sheet in the width direction, the first alignment plate shifts the sheet in the shift direction while applying a force toward the abutment portion to the sheet by the second transport unit. When shifting a second sheet in the shifted state in which the edge of the sheet on the first alignment plate side is located downstream in the shift direction from the downstream end in the shift direction of the abutment member furthest upstream in the shift direction, the first alignment plate shifts the sheet in the shift direction without applying a force toward the abutment portion by the second transport unit to the sheet. An image forming system characterized by the following features.

Description

This invention relates to a sheet processing apparatus for performing a binding process on a sheet, and to an image forming system. Patent Document 1 describes a sheet binding apparatus for binding sheets. In this apparatus, the rear end of a sheet placed on a processing tray is abutted against multiple rear end regulating members. The sheets are then width-aligned using a matching plate. This process is repeated to form a sheet bundle on the processing tray, and the sheet bundle is then bound using a stapler or the like. When performing corner binding on sheets using this type of sheet processing device, if the sheets on the processing tray are center-aligned using alignment plates (width alignment by sandwiching the sheet between the alignment plates on both sides at the point where the rear end of the sheet abuts against the rear end restricting member), depending on the sheet width, the position where the binding is to be performed may overlap with the rear end restricting member, making corner binding impossible. Therefore, for sheets of such width, the sheets are shifted one by one in the width direction to the corner binding position before performing width alignment (this is called shift alignment), thereby forming a sheet bundle at the corner binding position on the processing tray. During shift alignment, one alignment plate waits in the alignment position, while the other alignment plate pushes the sheet's edge in the width direction, shifting the sheet toward the other alignment plate. Because the sheet is shifted without being sandwiched between the alignment plates, large sheets, especially those larger than the specified size and with a longer vertical orientation (longer in the transport direction than in the width direction), are prone to skew. Therefore, to suppress skew of large sheets during shift alignment, the sheets are shifted one by one by the alignment plates while simultaneously applying a sufficient scraping force to shift the large sheet, pushing its rear end against the rear end regulating member. Japanese Patent Publication No. 2023-20999 A schematic cross-sectional view of the image forming system according to the embodiment.A schematic cross-sectional view of the sheet processing apparatus according to the embodiment.A schematic perspective view showing the sheet processing apparatus according to the embodiment with the upper cover removed.(a) A view of the alignment plate on the processing tray as seen from the width direction, (b) A view of the alignment plate as seen from the downstream side in the sheet transport direction, and (c) A perspective view of the alignment plate according to the embodiment.(a) A perspective view of the area around the processing tray in the home position of the sheet processing apparatus according to the embodiment, and (b) A schematic cross-sectional view of the sheet processing apparatus.A view from the width direction of (a) the discharge roller, (b) the scraping paddle, and (c) the rear end dropping member in the home position of the sheet processing apparatus according to the embodiment.(a) A perspective view of the area around the processing tray and (b) A schematic cross-sectional view of the sheet processing device during sheet discharge according to the embodiment.A view from the width direction of (a) the discharge roller, (b) the scraping paddle, and (c) the rear end dropping member when a sheet is discharged from the sheet processing apparatus according to the embodiment.(a) A perspective view of the area around the processing tray and (b) A schematic cross-sectional view of the sheet processing device during sheet feeding according to the embodiment.A view from the width direction of (a) the discharge roller, (b) the scraping paddle, and (c) the rear end dropping member during sheet scraping of the sheet processing device according to the embodiment.A perspective view of the area surrounding the knurled belt drive mechanism according to the first embodiment.A table showing the correspondence between each motor and each component of the sheet processing apparatus according to the embodiment.A block diagram showing the control configuration of the sheet processing apparatus according to the embodiment.A plan view of the sheet processing apparatus according to the embodiment, with some parts omitted, as seen from above.A flowchart showing an example of the control flow of the sheet processing device according to the embodiment.This flowchart shows an example of the control flow of the sheet processing apparatus according to the embodiment, particularly the flow when forming a sheet bundle on the processing tray.(a) A schematic diagram of the main part of the sheet processing device viewed from above during the transport of the first sheet in the stapling mode according to the embodiment, and (b) a schematic cross-sectional view of the configuration.(a) A schematic diagram of the main part of the sheet processing device viewed from ab