A paper sheet S is intermittently transported by a transport mechanism 6 and each processing unit 7, 8 operates while the transport mechanism pauses the transport operation. An information acquisition unit 9 obtains paper information from the paper sheet. A control unit 10 stores the paper information of the paper sheet to be processed for each processing unit, updates the data of the memory in a manner such that the paper information of the paper sheet associated with the previous processing unit is associated with the next processing unit every time the transport mechanism transports, and configures the settings of each processing unit for the next processing operation based on the paper information every time the processing operation of the processing unit is completed.

A postprocessing device performs postprocessing on sheets received from an image forming apparatus. The postprocessing device includes a pair of folding rollers, a folding blade, a transport device, a drive portion, and a drive controller. The drive controller controls the drive portion to match moving speed of a tip portion of the folding blade with moving speed of a circumferential surface of the folding rollers, at a time point that the sheaf of the sheets makes contact with the circumferential surface of the folding rollers, when the image forming apparatus forms the image by ink jet printing, and to match the moving speed of the tip portion of the folding blade with the moving speed of the circumferential surface of the folding rollers, at a time point that the sheaf of the sheets reaches the nip region between the folding rollers.

A postprocessing device includes a pair of folding rollers, a folding blade, a transport device, a roller driver, a blade driver, and a drive controller. The drive controller selectively performs one of a first rotation control, including controlling the roller driver to keep rotation speed of the pair of folding rollers constant, while the folding blade is moving away from a nip region, and a second rotation control, including controlling the roller driver to stop the rotation or slow down the rotation speed of the pair of folding rollers, while a tip portion of the folding blade is being withdrawn from a folded portion of a sheaf of sheets folded, and to restore the rotation speed of the pair of folding rollers to original rotation speed, after the tip portion of the folding blade has been removed from the folded portion of the sheaf of sheets folded.

A postprocessing device includes a pair of folding rollers, a folding blade, a transport device, a roller driver, a blade driver, and a drive controller. The drive controller selectively performs one of a first rotation control, including controlling the roller driver to keep rotation speed of the pair of folding rollers constant, while the folding blade is moving away from a nip region, and a second rotation control, including controlling the roller driver to stop the rotation or slow down the rotation speed of the pair of folding rollers, while a tip portion of the folding blade is being withdrawn from a folded portion of a sheaf of sheets folded, and to restore the rotation speed of the pair of folding rollers to original rotation speed, after the tip portion of the folding blade has been removed from the folded portion of the sheaf of sheets folded.

A first unit includes a receiving portion that receives a medium to be processed, a drying unit that processes the medium received from the receiving portion, and an end stitching unit that processes the medium received from the receiving portion or the medium processed by the drying unit. The processing performed by the drying unit is processing of drying the medium, the drying unit is located vertically below the end stitching unit, and the drying unit and the end stitching unit have a portion overlapping when viewed in a vertical direction.

A post-processing device includes a loading unit on which a sheet is loaded, a first transport unit configured to apply, to the sheet loaded on the loading unit, a transport force toward an alignment unit, a second transport unit located between the first transport unit and the alignment unit, and configured to apply, to the sheet, a transport force toward the alignment unit, a control unit configured to control rotation operation of the second transport unit, and a post-processing unit configured to perform post-processing on the sheet transported to the alignment unit, wherein the post-processing unit is configured to execute a plurality of types of the post-processing, and the control unit is configured to control the rotation operation of the second transport unit in accordance with the type of the post-processing.

A post-processing apparatus includes a post-processing device, an ejection device, and an ejection tray. The post-processing device executes post-processing on a medium on which an image is formed by an image forming apparatus. The ejection device ejects the medium on which the post-processing is executed by the post-processing device. The ejection tray holds the medium ejected by the ejection device. The ejection tray includes a main tray having an upper face inclined downward in an ejection direction, and a movable tray being rotatably supported by the main tray between a stacking position at which the medium ejected by the ejection device remains stacked on the upper face of the main tray and an ejection position at which the medium ejected by the ejection device slides along the upper face of the main tray.

In a sheet folding apparatus for folding a sheet, a sheet is pushed at a predetermined position thereof by a push member while the sheet is being conveyed by a conveyance roller. The predetermined position of the sheet is guided to the nip section of a folding roller pair. Then, the sheet is nipped at the predetermined position thereof and folded by the folding roller pair.

In a sheet folding apparatus for folding a sheet, a sheet is pushed at a predetermined position thereof by a push member while the sheet is being conveyed by a conveyance roller. The predetermined position of the sheet is guided to the nip section of a folding roller pair. Then, the sheet is nipped at the predetermined position thereof and folded by the folding roller pair.

A conveying unit 2including conveyor belts 7, a stopper 3positioning a sheet S at a folding position P on a conveying path 2, a knife-type folding unit 4, an anti-bounce roller unit 16having rollers 25a, 25b, and a motor 22 are provided. The rollers can be moved back and forth. A roller rotational speed monitoring unit 31 and a roller position setting unit 32 operatively connected to the motor are further provided. In setting mode, the rollers are moved from an upstream or a downstream of a tail end of the sheet positioned at the folding position P toward the tail end at a constant speed and stopped when the rotational speed of the rollers changes.