A stacking wheel mechanism (30) includes a stacking wheel (32) that is arranged near a stacking unit (26) and having a plurality of elastic blades (32a) on an outer circumferential surface thereof, and a blade guiding member (38) that is arranged near the stacking wheel (32) to guide the blades (32a) of the stacking wheel (32). The blade guiding member (38) guides the blades (32a) of the stacking wheel (32) such that the blades (32a) of the stacking wheel (32) enter into a transport path (for example, an internal transport path (36)) when the stacking wheel (32) rotates in a feeding-in direction of a paper sheet toward the stacking unit (26) and the blades (32a) of the stacking wheel (32) retreat from the transport path when the stacking wheel (32) rotates in a feeding-out direction of the paper sheet from the stacking unit (26).

A sheet postprocessing device includes a saddle binding device configured to stack a plurality of recording sheets on a table, abut leading edges of the respective recording sheets against a leading edge cursor, thus to align the leading edges with each other, and bind the center of the recording sheets and fold the recording sheets, and a first pressing member supported so as to pivot in a direction toward and away from the table. The first pressing member is made to pivot toward the table by self-weight thereof, allows the leading edge of the recording sheet delivered to the table to pass toward the leading edge cursor, and presses a portion of the recording sheet in a proximity of the leading edge, at a position upstream of the leading edge cursor, in a delivery direction of the recording sheet.

A mechanism (100a or 100b) for preventing the folding of an intermediate item (300) in a knife folder (200) is disclosed. The mechanism (100a or 100b) includes a deflector (50) that is movable between a non-operating position (50a) and an operating position (50b). When the intermediate item is moving on the folding rollers (230a and 230b) of the knife folder (200), the deflector (50) is moved to the operating position (50b) for deflecting the received intermediate item towards a roller gap (232) of the folding rollers by the deflector end (20) of the deflector. Upon rotating the folding rollers, the intermediate item (300) moves away from the knife folder (200) through the roller gap (232) preventing folding of the intermediate item (300).

A stacker includes a placement part that stacks thereon sheets discharged from a discharge port by a conveyor that conveys the sheets; a side guide that regulates edges of the sheets in a width direction intersecting a discharge direction of the sheets; a guide driver that moves the side guide along the width direction; and a controller configured to control the guide driver to position the side guide at a position where the sheet discharged from the discharge port is supported from below by the side guide.

The present invention provides a transport guide drive mechanism that corrects the transport state in a paper sheet transport device including a wide transport surface that can be used in common for paper sheets with different width dimensions, to a normal state while preventing a deformation or a damage of the paper sheets during continuous and unintermittent transport. The transport guide drive mechanism includes transport guides 310 that are arranged along both side edges of a transport surface 11 in a width direction to oppose each other and that respectively guide both side edges of a paper sheet to be transported, an advancing/retreating mechanism 350 that causes the transport guides to synchronously protrude and retract in a predetermined direction, stoppers 440 each of which defines a protruded position where an associated one of the transport guides 310 is most protruded from the transport surface 11 and a retracted position retracted from the protruded position toward the transport surface, and a DC motor 450 that drives the advancing/retreating mechanism 350.