Provided is a sheet transport mechanism disposed between a feeding mechanism feeding out a sheet and an acceptance mechanism receiving the sheet. The sheet transport mechanism includes: a transport unit that transports the sheet; and a plurality of curl correction units each including a contact unit which comes into contact with the sheet that is transported by the transport unit. The plurality of curl correction units is disposed at positions different from each other on a transport route of the transport unit, respectively.

A bookbinding device includes a control unit for calculating set parameter values for a clamper and a processing unit on the basis of thickness on a book body to be bound, and initially setting the clamper and the processing unit in accordance with the set parameter values. The control unit includes an input unit for receiving an input of a reference parameter value for two or more different book body thicknesses; a function generation unit for generating, on the basis of the reference parameter value, a function for calculating a set parameter value that has been adjusted in accordance with the book body thickness; a parameter calculation unit for calculating, on the basis of the book body thickness, the set adjusted parameter value by using the function; and an initial setting unit for initially setting the clamper and the processing unit in accordance with the set adjusted parameter value.

A sheet pressing mechanism includes a pressing member configured to press a sheet that has been deformed to corrugate in a width direction that is orthogonal to a sheet discharging direction when the sheet is discharged toward a discharge tray. The pressing member has a first pressing area for pressing portions other than a top portion of a crest of the sheet when the discharged sheet comes into contact with the pressing member.

A printer includes a recording unit which performs recording on paper, an discharge portion which discharges the paper after the recording by the recording unit, a first paper discharge tray on which the paper which is discharge from the discharge portion is placed, and a retainer which includes a plurality of retaining portions which retains the paper toward the first paper discharge tray on a downstream in a medium discharge direction of the discharge portion, in which the plurality of retaining portions includes a first retaining portion and a second retaining portion which retains closer to an upstream in the medium discharge direction than a retaining position of the first retaining portion.

An image forming apparatus includes an image forming unit to form an image on a sheet, a sheet ejection section to which a relay unit and a sheet processing apparatus are removably coupled, a driving-side ejection roller disposed in the sheet ejection section, to eject the sheet outside the apparatus, a plurality of driven-side ejection rollers that are replaceable, one of which is disposed facing the driving-side ejection roller, and a roller holder removably secured to the sheet ejection section to hold the one of the plurality of driven-side ejection rollers. Each driven-side ejection roller has a shaft and a plurality of roller bodies attached to the shaft and lined in an axial direction of the shaft. The driven-side ejection roller is replaced with another driven-side ejection roller in accordance with whether or not the relay unit and the sheet processing apparatus are coupled to the sheet ejection section.

A sheet handling apparatus (for example, banknote handling apparatus 20) includes a storing and feeding unit (25) in which a sheet is stored on a rotary member (for example, drum (25a)) by winding the sheet on the rotary member and the sheet wound on the rotary member can be fed from the rotary member, a transport unit (23) that transports the sheet fed from the storing and feeding unit (25), a curl correction mechanism (70) that corrects a curl of the sheet transported by the transport unit (23), and a stacking unit (for example, banknote collection bag (34)) in which the sheet that has passed through the curl correction mechanism (70) is stacked.

A sheet handling apparatus (for example, banknote handling apparatus 20) includes a storing and feeding unit (25) in which a sheet is stored on a rotary member (for example, drum (25a)) by winding the sheet on the rotary member and the sheet wound on the rotary member can be fed from the rotary member, a transport unit (23) that transports the sheet fed from the storing and feeding unit (25), a curl correction mechanism (70) that corrects a curl of the sheet transported by the transport unit (23), and a stacking unit (for example, banknote collection bag (34)) in which the sheet that has passed through the curl correction mechanism (70) is stacked.

A sheet discharge device has a sheet discharge port, a conveying guide, discharge roller pairs, corrugation members, and first biasing members, and discharges sheets onto a discharge tray sequentially. The corrugation members are arranged between the discharge roller pairs to protrude beyond a nip portion in them and stiffens the sheet by pressing one side of the sheet. The first biasing members bias the corrugation members in the protruding direction. Each of the corrugation members has, in a region extending from the upstream side to a downstream-side end part of the discharge roller pairs in the sheet discharge direction and including the nip portion, a first pressing part making contact with one side of the sheet and, in a region further on the downstream side of the downstream-side end part of the discharge roller pairs, a second pressing part making contact with one side of the sheet.

A medium discharging device includes a paper discharging tray that is disposed below a height position of a discharging roller which discharges a medium and includes a placing surface on which the medium discharged by the discharging roller is placed, and a supporting member that is configured to be movable between a retreat position on an upstream side and an advance position on a downstream side between the discharging roller and the placing surface.

A medium discharging device includes a paper discharging tray that is disposed below a height position of a discharging roller which discharges a medium and includes a placing surface on which the medium discharged by the discharging roller is placed, and a supporting member that is configured to be movable between a retreat position on an upstream side and an advance position on a downstream side between the discharging roller and the placing surface.