A sheet post-processing device includes: an alignment member which aligns a sheet bundle on a stacking tray; and a stapler which performs binding processing on a rear end of the sheet bundle. The stapler includes: a first stapler which moves along the rear end of a first sheet bundle and performs the binding processing on a plurality of positions at the rear end of the first sheet bundle; and a second stapler which performs, at one part of an end portion of the rear end on one side, binding processing different from the first stapler. The alignment member includes: a first alignment member and a second alignment member which align the sheet bundle in a first stacking position; and a third alignment member which is fixed to a position corresponding to the second stapler and which aligns the sheet bundle in a second stacking position with the first alignment member.

A sheet loader includes a housing and a fence. The housing has a bottom face. The fence is movable in a fence moving direction and configured to regulate a position of an end face of the sheet to be loaded in the housing. The fence includes a sliding face and a bend. The sliding face is configured to slide on the bottom face of the housing as the fence moves. The bend is disposed at an end of the sliding face in the fence moving direction and bent in a direction away from the bottom face of the housing.

A sheet loader includes a housing and a fence. The housing has a bottom face. The fence is movable in a fence moving direction and configured to regulate a position of an end face of the sheet to be loaded in the housing. The fence includes a sliding face and a bend. The sliding face is configured to slide on the bottom face of the housing as the fence moves. The bend is disposed at an end of the sliding face in the fence moving direction and bent in a direction away from the bottom face of the housing.

A sheet conveyance apparatus includes a control unit configured to determine that the sheet is of a first size in a case where first and second detection sensors detect that a sheet is present and determines that the sheet is of a second size smaller than the first size in a case where the first detection sensor detects that the sheet is present and the second detection sensor detects no sheet. The control unit controls the sheet conveyance unit in a first mode in a case where the control unit determines that the sheet is of the first size and controls the sheet conveyance unit in a second mode in which a sheet conveyance speed is slower than that of the first mode in a case where the control unit determines that the sheet is of the second size.

A conveyance apparatus that conveys a sheet by passing the sheet through a nip formed between a first conveyance roller and a second conveyance roller contacting each other. The conveyance apparatus includes a first gate member, a second gate member, and a third gate member into which a rotational shaft of the first conveyance roller is loosely inserted, the first and second gate members being disposed at a predefined interval, the third gate member being disposed between the first and second gate members. The first, second, and third gate members each include a portion protruding radially outwards, and the protruding portions are positioned on a conveyance path during no sheet conveyance, the protruding portion of the third gate member being positioned upstream of the protruding portions of the first and second gate members in a conveyance direction.

A conveyance apparatus that conveys a sheet by passing the sheet through a nip formed between a first conveyance roller and a second conveyance roller contacting each other. The conveyance apparatus includes a first gate member, a second gate member, and a third gate member into which a rotational shaft of the first conveyance roller is loosely inserted, the first and second gate members being disposed at a predefined interval, the third gate member being disposed between the first and second gate members. The first, second, and third gate members each include a portion protruding radially outwards, and the protruding portions are positioned on a conveyance path during no sheet conveyance, the protruding portion of the third gate member being positioned upstream of the protruding portions of the first and second gate members in a conveyance direction.

A sheet transportation device includes a sheet loading table, a feeding unit that feeds a sheet placed on the sheet loading table, a first detection unit that is provided downstream of the feeding unit in a sheet transportation direction and that detects a position of a leading end of the sheet, a second detection unit that is provided upstream of the feeding unit in the sheet transportation direction and that detects a position of a leading end of a small-size sheet which is smaller than the sheet detected by the first detection unit, and a control unit that starts feeding the sheet based on a result of detection performed by any of the first detection unit or the second detection unit in accordance with a size of the sheet.

A sheet conveyance apparatus that conveys a sheet along a curved path shorter than the sheet and corrects skew of the sheet, includes: a conveyance roller that sends the sheet into the curved path; a guide that guides the sheet along the curved path; and a gate that is hinders advance of the leading end, generates a moment about a normal of the sheet passing through the leading end, and allows advance of the leading end by being pushed away by the leading end, wherein the guide includes a projection projecting toward a movement space for the sheet on a surface facing the movement space, and the projection abuts a center portion of the sheet in a longitudinal direction and generates a moment about an axis parallel to an advance direction of a portion that has come into contact with the projection.

A sheet conveyance apparatus that conveys a sheet along a curved path shorter than the sheet and corrects skew of the sheet, includes: a conveyance roller that sends the sheet into the curved path; a guide that guides the sheet along the curved path; and a gate that is hinders advance of the leading end, generates a moment about a normal of the sheet passing through the leading end, and allows advance of the leading end by being pushed away by the leading end, wherein the guide includes a projection projecting toward a movement space for the sheet on a surface facing the movement space, and the projection abuts a center portion of the sheet in a longitudinal direction and generates a moment about an axis parallel to an advance direction of a portion that has come into contact with the projection.

A sheet conveying apparatus including: a locking member having an abutment surface abutting a sheet to correct skew feed of the sheet; a holding member configured to hold the locking member to rotate from a waiting position when the locking member is pushed by the sheet; a roller pair configured to nip the sheet abutting the abutment surface; a first urging portion configured to urge the holding member to the waiting position; a movable support portion configured to support the locking member in a manner that the locking member is located a retracted position where the locking member contacts a surface of the sheet and allows the sheet to pass; and a second urging portion configured to urge the locking member to a position where the abutment surface abuts a succeeding sheet.