A post-processing apparatus includes a post-processing apparatus side detecting unit that detects a position of a paper sheet, in which in a case where it is determined by a determining unit that the paper sheet is to be cut, the determining unit determining whether or not to cut a paper sheet on which a transport failure straddling an image forming apparatus main body and a post-processing apparatus main body has occurred, based on at least one of an output of the post-processing apparatus side detecting unit or an output of an image forming apparatus side detecting unit included in an image forming apparatus, a presentation unit is allowed to make a presentation for promoting cutting of the paper sheet.

An image forming apparatus includes a cutter, an image forming section, and a controller. The cutter performs cutting of a print medium on the basis of a cutting instruction. The image forming section performs, on the basis of print data, image formation on the print medium with use of a consumable material. The controller calculates, on the basis of the print data, an estimated use amount on the basis of a section page group as a unit, and determines, on the basis of the estimated use amount and a usable amount, whether the image forming section is able to use the consumable material. The section page group is a page group, of the print medium, sectioned in accordance with the cutting instruction. The estimated use amount is an amount of the consumable material to be used. The usable amount is a remaining amount of the consumable material that is usable.

An image forming apparatus includes an image forming unit to form an image on a sheet, an intermediate processing tray where sheets conveyed through a first conveyance path are stacked as a sheet bundle, a sensor disposed at a second conveyance path to detect a conveyed sheet bundle, and a stacking tray in which sheets discharged through a discharging path diverging from the first conveyance path are stacked. In response to a sensor detected paper jam, a control unit determines the intermediate processing tray as the discharging destination for a sheet among the remaining sheets, and determines the stacking tray as the discharging destination for a sheet among the remaining sheets. After the paper jam is cleared, the control unit causes execution of bookbinding and cutting for a sheet bundle including the remaining sheets stacked in the intermediate processing tray.

A post processing apparatus includes: a reader that reads paper on which an image is formed by an image forming apparatus to acquire a read image; a post processor that performs post processing on the paper; and a hardware processor that detects a position of an edge of the paper and a position of the image from the read image acquired by the reader, and controls a post processing position in the post processor on the basis of the position of the edge of the paper and the position of the image detected.

A sheet cutting apparatus includes a cutting unit configured to cut a sheet, a blowing unit configured to send air toward the cutting unit, a container unit configured to contain scraps generated when the sheet is cut, a scrap path configured to allow the scraps travelling toward the container unit from the cutting unit to pass through, wherein the scrap path is formed of a member provided with openings for allowing the air sent by the blowing unit to pass through.

A post-processing device includes: a cutter that performs cutting processing for dividing a printed sheet into a plurality of pieces; and a hardware processor that determines an overlapping region where a content of a recovery-printed sheet on which recovery printing has been performed due to an error which causes the cutting processing to be stopped during the cutting processing by the cutter is overlapped with a content of a printed matter obtained by the cutting processing before the error occurs, and makes the cutter cut the overlapping region of the recovery-printed sheet into pieces larger than the printed matter.

A method of self-adaption adjustment for post-printing treatment including steps of S1: printing a plurality of identifiers on a paper sheet for positioning actual locations of treatment on the paper sheet; S2: detecting the identifiers on the paper sheet, and locating the actual locations to be treated according to the locations of the identifiers and/or relative locations among the identifiers; and S3: adjusting locations of treatment from a post-printing treatment mechanism to the paper sheet according to the actual locations output in step S2. A system of self-adaption adjustment for post-printing treatment including a printing module, a detection module, a treatment module, a driving module and a post-printing treatment mechanism. The method and system realize the self-adaption adjustment, which effectively solves the problems that an actual value after skewing or stretching or shrinking the actual printing content is inconsistent with a theoretical value of typesetting, thus effectively improving the production efficiency and production quality, which has favorable economic and social benefits. The method and system can be widely applied in various post-printing treatment systems.

A corner cut apparatus for entering into a transport path for transporting a sheet in a crossing direction to cut corners of the sheet includes a cut blade frame that supports a cut blade shifting with respect to the sheet surface, a receiving blade frame that supports a receiving blade for receiving the shifting cut blade, and a drive member that causes the cut blade frame and the receiving blade frame to enter into the transport path of the sheet, where blade shapes of the cut blade and the receiving blade are a back-to-back shape with an entry direction as a reference line. By this means, it is possible to provide the apparatus for cutting corners at the lead edge and end edge of the sheet in an inclined or curved manner, only by shifting (up and down) the blade with respect to the sheet surface.

Provided is a technique that can suitably form a cut line. According to one embodiment, an image forming device includes a line information generation unit and an image forming unit. The line information generation unit generates line information representing a cut line to cut out a main image formed on a recording medium. The image forming unit forms the main image with a non-decolorable material on the recording medium and forms the cut line represented by the line information with a decolorable material on the recording medium. The line information generation unit changes a level of curving of a curve included in the cut line, according to the recording medium.

A post-processing apparatus includes a side edge part removing portion that removes a side edge part from a sheet; a side edge part housing portion that houses the removed side edge part and is able to be pulled out from an apparatus body; a guide plate that is inclined in a direction intersecting with a moving direction of the side edge part and guides the removed side edge part along the moving direction to the housing portion; and a second guide plate that is arranged between the housing portion and the guide plate, and is transformable into a first form having substantially mountain-shaped inclined surfaces in which both end portions of the second guide plate along the moving direction are lower than a center portion thereof, and a second form having substantially valley-shaped inclined surfaces in which both the end portions are higher than the center portion.