A medium discharging device includes a side cursor, a moving unit, a discharge unit, and a side guide. The side cursor is provided in a processing tray and is provided movable in an intersecting direction intersecting a discharging direction of the medium, aligns an end portion of a media bundle in the intersecting direction, and guides the media bundle in the discharging direction when the media bundle is discharged. The moving unit moves the side cursor in the intersecting direction. The discharge unit discharges the media bundle from the processing tray to the discharge tray where the media bundle is placed. When the media bundle is discharged, the side guide is disposed alongside the side cursor in the discharging direction and restricts movement of the media bundle in the intersecting direction, which is discharged by the discharger.

A medium conveyance device includes a first loading base that has a first loading surface formed thereon and is movably supported on a main body, a second loading base that has a second loading surface formed thereon and is movably supported on the first loading base so that the second loading surface is positioned next to with the first loading surface and so that the second loading surface overlaps with the first loading surface, a mechanism that converts motion of the first loading base into motion of the second loading base so that the second loading base is arranged in a position corresponding to a position in which the first loading base is arranged, and an elastic member that is elastically deformed when the second loading base is not arranged in a position corresponding to a position in which the first loading base is arranged.

A paper stack S supplied between clamping plates 1a, 1b of a carriage clamp 1 is pushed toward a positioning bar 2b by an alignment bar 5. A nip head 7 of a paper stack supplying unit 3 has first and second nip plates 9, 10, and a nip plate drive mechanism 11 moving each nip plate from a protruding position at which the nip plate protrudes from the nip head and a retracted position at which the nip plate retracts into the nip head, and translating the second nip plate taking the protruding position relative to the first nip plate taking the protruding position between a first position at which the first and second nip plates receive the paper stack therebetween and a second position at which the second nip plate cooperates with the first nip plate to grip the paper stack.

A sheet processing apparatus includes a conveyance unit configured to convey a sheet, a stacking portion on which the sheet conveyed by the conveyance unit is stacked, a first regulation member configured to regulate a position of an edge portion, in a conveyance direction, of the sheet stacked on the stacking portion, a second regulation member configured to regulate a position of an edge portion, in a width direction orthogonal to the conveyance direction, of the sheet stacked on the stacking portion, a binding unit supported movably in the conveyance direction and configured to perform a binding process of binding the sheet stacked on the stacking portion, and a moving unit configured to move the second regulation member in the conveyance direction accompanied with a movement, in the conveyance direction, of the binding unit.

A sheet stacker includes a sheet stacking member, a biasing force applier, an angle setter, and a regulator. The sheet stacking member has an upstream portion in a sheet conveyance direction. The upstream portion is movable in a vertical direction. The biasing force applier is configured to apply a biasing force to bias the sheet stacking member upward. The angle setter is configured to set an angle of the sheet stacking member in the sheet conveyance direction, relative to a sheet conveying portion, between a first angle and a second angle. The regulator is configured to regulate movement of the sheet stacking member in a case in which the upstream portion of the sheet stacking member is located closer to the sheet conveying portion at either the first angle or the second angle.

A paper sheet stacking device includes: a conveyance mechanism that conveys paper sheets; a stacking mechanism including a stacking space in which the paper sheets, which are conveyed by the conveyance mechanism, are stacked, a first space regulating member that moves in a thickness direction of the paper sheets in the stacking space, a support member that extends in the moving direction of the first space regulating member and supports one side of the paper sheets in the stacking space, and a second space regulating member that is provided to face the support member and moves in a direction toward and away from the support member; and a controller that controls the stacking mechanism. The controller controls a position of the second space regulating member in accordance with an outer dimension of the paper sheets that are conveyed into the stacking space by the conveyance mechanism.

A media-sheet stacking system for stacking media sheets on a device output tray comprises a kicker to advance a media sheet along the output tray by pushing a trailing edge of the media sheet as it exits the device, and a movable element arranged to face the output tray across a space that receives media sheets exiting the device. A drive mechanism is provided to drive the movable element in the direction of advance of the media sheet along the output tray.

A post-processing apparatus that rotates a rotation paddle in which a fin having flexibility is cantilevered by a holder to apply a conveying force along a rotation direction to a sheet to align the sheet, wherein the holder includes a recess in which a peripheral surface part from a support position of the fin to an upstream side in the rotation direction is recessed from a circumscribed circle of the holder, and when the fin elastically turns while being pressed against the sheet with rotation of the rotation paddle, turning of the fin is allowed until the fin comes into contact with a surface of the recess.

A medium conveyance device includes a first loading base that has a first loading surface formed thereon and is movably supported on a main body, a second loading base that has a second loading surface formed thereon and is movably supported on the first loading base so that the second loading surface is positioned next to with the first loading surface and so that the second loading surface overlaps with the first loading surface, a mechanism that converts motion of the first loading base into motion of the second loading base so that the second loading base is arranged in a position corresponding to a position in which the first loading base is arranged, and an elastic member that is elastically deformed when the second loading base is not arranged in a position corresponding to a position in which the first loading base is arranged.

A post-processing apparatus includes an ejection tray receiving a recording medium that is ejected, an elastic member urging the ejection tray upward in a vertical direction, a moving mechanism causing the ejection tray to move up and down in the vertical direction, and a driving source driving the moving mechanism.