Provided is a sheet post-processing apparatus in which a control portion repetitively performs a width-direction alignment operation including a first alignment operation of moving width regulating members from standby positions to first regulating positions before a sheet that is carried in onto a processing tray is aligned in a carry-in direction by abutting of an edge of the sheet against a reference plate, and a second alignment operation of moving the width regulating members from the standby positions to second regulating positions after the sheet has been aligned in the carry-in direction by the reference plate. The sheet post-processing apparatus satisfies C1>C2>P1?C3 where P1 is a size in a width direction of the sheet, and C1, C2, and C3 are intervals between the width regulating members at the standby positions, the first regulating positions, and the second regulating positions, respectively.

Provided is a sheet post-processing apparatus in which a control portion repetitively performs a width-direction alignment operation including a first alignment operation of moving width regulating members from standby positions to first regulating positions after a sheet that is carried in onto a processing tray has been aligned in a carry-in direction by abutting of an edge of the sheet against a reference plate, and a second alignment operation of moving the width regulating members from the first regulating positions to the standby positions after performing the first alignment operation, and then moving the width regulating members to second regulating positions. The sheet post-processing apparatus satisfies C1>C2>P1?C3 where P1 is a size in a width direction of the sheet, and C1, C2, and C3 are intervals between the width regulating members at the standby positions, the first regulating positions, and the second regulating positions, respectively.

Provided is a sheet post-processing apparatus in which a control portion repetitively performs a width-direction alignment operation including a first alignment operation of moving width regulating members from standby positions to first regulating positions after a sheet that is carried in onto a processing tray has been aligned in a carry-in direction by abutting of an edge of the sheet against a reference plate, and a second alignment operation of moving the width regulating members from the first regulating positions to the standby positions after performing the first alignment operation, and then moving the width regulating members to second regulating positions. The sheet post-processing apparatus satisfies C1>C2>P1?C3 where P1 is a size in a width direction of the sheet, and C1, C2, and C3 are intervals between the width regulating members at the standby positions, the first regulating positions, and the second regulating positions, respectively.

The sheet postprocessing device includes a sheet conveyance path, a sheet tray, a carry-in guide, a processing part, a discharge member, a blower device, and an intermediate conveyance part. The sheet tray includes an upstream-side stacking part. The intermediate conveyance part is provided at a position within a range from the upstream-side stacking part to the downstream-side stacking part in a conveyance direction, and allows a sheet to pass therethrough below the processing part. The intermediate conveyance part is made up by including an upstream part including a first clearance through which the sheet passes, and a downstream part placed on a downstream side of the upstream part and including a second clearance through which the sheet passes. A size of the second clearance in a planar direction perpendicular to a surface of the sheet is wider than a size of the first clearance in the planar direction.

The sheet postprocessing device includes a sheet conveyance path, a sheet tray, a carry-in guide, a processing part, a discharge member, a blower device, and an intermediate conveyance part. The sheet tray includes an upstream-side stacking part. The intermediate conveyance part is provided at a position within a range from the upstream-side stacking part to the downstream-side stacking part in a conveyance direction, and allows a sheet to pass therethrough below the processing part. The intermediate conveyance part is made up by including an upstream part including a first clearance through which the sheet passes, and a downstream part placed on a downstream side of the upstream part and including a second clearance through which the sheet passes. A size of the second clearance in a planar direction perpendicular to a surface of the sheet is wider than a size of the first clearance in the planar direction.

A sheet postprocessing apparatus includes a table configured to receive a plurality of sheets delivered thereto, and inclined downward toward a downstream side in a sheet delivery direction, a leading edge cursor provided on a far side on the table in the delivery direction, and configured to align respective leading edges of the sheets abutted against the leading edge cursor, and a postprocessing device including a stapling device that binds a central portion in the delivery direction, of the sheets stacked on the table, and a center folding device that folds the sheets along the central portion. The table includes an upper face region that allows the sheet to slide thereon, and a plurality of slip sheets of a belt-like shape, each extending on the upper face region along the delivery direction, with a clearance between each other in a width direction orthogonal to the delivery direction.

A sheet postprocessing apparatus includes a table configured to receive a plurality of sheets delivered thereto, and inclined downward toward a downstream side in a sheet delivery direction, a leading edge cursor provided on a far side on the table in the delivery direction, and configured to align respective leading edges of the sheets abutted against the leading edge cursor, and a postprocessing device including a stapling device that binds a central portion in the delivery direction, of the sheets stacked on the table, and a center folding device that folds the sheets along the central portion. The table includes an upper face region that allows the sheet to slide thereon, and a plurality of slip sheets of a belt-like shape, each extending on the upper face region along the delivery direction, with a clearance between each other in a width direction orthogonal to the delivery direction.

A recording medium post-processing apparatus includes: a stacker which is stacked with a plurality of sheet-like recording media with images being recorded thereon; an receiving device which receives at least one of information regarding the images to be recorded on the recording media and information regarding the recording media; an alignment device which applies an external force to the recording media stacked on the stacker so as to align the recording media; a controller which sets, on the basis of the at least one information received by the receiving device, at least one of (i) a stacked-sheet number that is the number of the recording media, and (ii) a magnitude of the external force that is applied to the recording media and which controls the alignment device on the basis of the setted at least one of the stacked-sheet number and the magnitude of the external force.

A recording medium post-processing apparatus includes: a stacker which is stacked with a plurality of sheet-like recording media with images being recorded thereon; an receiving device which receives at least one of information regarding the images to be recorded on the recording media and information regarding the recording media; an alignment device which applies an external force to the recording media stacked on the stacker so as to align the recording media; a controller which sets, on the basis of the at least one information received by the receiving device, at least one of (i) a stacked-sheet number that is the number of the recording media, and (ii) a magnitude of the external force that is applied to the recording media and which controls the alignment device on the basis of the setted at least one of the stacked-sheet number and the magnitude of the external force.

In accordance with an embodiment, a sheet processing apparatus comprises an axis of rotation; a standby section configured to buffer a sheet; a processing section configured to execute a post processing on sheets moved from the standby section; a first paddle configured to be mounted in the axis of rotation and be rotated around the axis of rotation to contact with the sheet supplied from the standby section to draw the sheet into a stopper; and a second paddle configured to be mounted in the axis of rotation at a predetermined angle with respect to the first paddle and draw the sheet into the stopper after the first paddle is separated from the sheet after a drawing-in operation of the sheet by the first paddle.