A post-processing apparatus according to an embodiment includes a processing tray, a post-processing section, a sensor, and a control section. A sheet supplied from an image forming apparatus is led into the processing tray through a lead-in path. The post-processing section applies post-processing to the sheet sent from the processing tray. The sensor detects an object passing a detection space in the lead-in path. The control section controls operation of the post-processing section based on a time in which the sensor detects the object.

A stapling device of a paper finishing device of one embodiment of the present disclosure includes a stapler including an entrance into which one side of paper is inserted, a moving part including a stapler moving bracket on which the stapler is seated and a moving roller installed on the stapler moving bracket, a driving part which moves the stapler moving bracket, a base frame on which the stapler moving bracket and the driving part are installed, and which includes a horizontal guide surface extending along the one side of the paper, a first corner stapling guide surface spaced apart from the horizontal guide surface, and a first inclined guide surface which diagonally connects the horizontal guide surface and the first corner stapling guide surface, and a position guide part which is installed on the base frame and includes a second corner stapling guide surface and a second inclined guide surface which diagonally connects the horizontal guide surface and the second corner stapling guide surface and is inclined to be opposite to the first inclined guide surface.

An image forming apparatus includes a sheet separation device, a first sheet feeder, a second sheet feeder, an image forming device, a heat source, and a circuitry. The sheet separation device is configured to separate a two-ply sheet in which two sheets are overlapped and bonded together at one end as a bonding portion of the two-ply sheet. The first sheet feeder is configured to feed the two-ply sheet. The second sheet feeder is configured to feed an inner sheet to be inserted between the two sheets. The image forming device is configured to form an image on the inner sheet fed from the second sheet feeder. The heat source is disposed upstream from the sheet separation device in the sheet conveyance direction. The circuitry is configured to cause the two-ply sheet fed from the first sheet feeder, to detour the heat source to the sheet separation device.

An image processing apparatus includes a read image obtaining unit configured to obtain read image data indicative of an image having been read, a target generation unit configured to generate, based on the read image data, target data indicative of a target color of a print medium, and a gradation correction unit configured to correct, based on the target data, a gradation of print image data indicative of an image to be formed.

A post-processing device includes a processing tray on which a medium on which recording was performed by a recording unit is loaded, a rear end alignment unit that aligns a rear end (an example of an end portion) of the medium on the processing tray, a post-processing unit that performs post-processing on the medium aligned by the rear end alignment unit, and a pressing member that presses the rear end of the medium. The post-processing unit is configured to be movable. The pressing member is provided to be rotatable in conjunction with movement of the post-processing unit, in a state in which the pressing member is in contact with the medium aligned by the rear end alignment unit.

A decoloring apparatus includes a sheet conveying unit, a scanner, a decoloring unit, and a controller. The decoloring unit decolors the image on the sheet conveyed through the sheet conveying unit. The decoloring unit is positioned downstream of the scanner in a sheet conveying direction. A distance along the sheet conveying direction between the scanner and the decoloring unit is shorter than a length of a first predetermined sheet size and longer than a length of a second predetermined sheet size. A controller determines whether the sheet conveyed by the sheet conveying unit is the first predetermined sheet size or the second predetermined sheet size. The controller performs a mode limiting process if the sheet size is determined to be the first predetermined sheet size.

A post-processing device includes: multiple types of post-processing modules that are disposed at predetermined installation positions within the post-processing device and each execute post-processing to an output sheet on which an image is formed; and a controller that (i) detects the post-processing modules at the installation positions and (ii) determines and controls adjustment contents of the post-processing modules based on a detection result.

A post-processing apparatus includes memory and a processor configured to control a curving device that curves a sheet, which is transported to the curving device, by pressing the sheet, control folding processing that is performed on a sheet curved by the curving device, and control, when folding processing is performed such that two ends of a sheet in a transport direction of the sheet face outward in opposite directions after the folding processing has been performed on the sheet, the curving device so as to curve the sheet in plural directions with respect to a transport surface.

An image forming apparatus includes a sheet separation device, a first sheet feeder, a second sheet feeder, an image forming device, a heat source, and a circuitry. The sheet separation device is configured to separate a two-ply sheet in which two sheets are overlapped and bonded together at one end as a bonding portion of the two-ply sheet. The first sheet feeder is configured to feed the two-ply sheet. The second sheet feeder is configured to feed an inner sheet to be inserted between the two sheets. The image forming device is configured to form an image on the inner sheet fed from the second sheet feeder. The heat source is disposed upstream from the sheet separation device in the sheet conveyance direction. The circuitry is configured to cause the two-ply sheet fed from the first sheet feeder, to detour the heat source to the sheet separation device.

A sheet processing apparatus includes a puncher, a first sensor positioned upstream of the puncher in the conveyance direction, a second sensor positioned upstream of the first detection position in the conveyance direction, a drive source configured to drive the puncher, a controller configured to control the drive source. The controller executes a control mode including a first process of controlling a rotation speed of the puncher on a basis of a detection result of the second sensor and a second process of controlling the rotation speed of the puncher on a basis of a detection result of the first sensor. In the control mode, the controller does not stop rotation of the puncher in a period between the punching process on the preceding sheet and a punching process on the succeeding sheet.