Patent ID: 7215922

Claim:
A sheet post process apparatus, the apparatus comprising: a waiting tray to temporarily retain a transported sheet in a waiting mode and release the support to drop the sheet; a processing tray to align and hold the sheet dropped from the waiting tray; and a storage tray to hold the sheet processed by the processing tray, wherein the waiting tray comprises: left and right lower face support members which support left and right lower faces in a sheet transport direction during retention in a waiting mode and release the support of a sheet distal end lower face of the left and right lower faces during release of the retention; a distal end lower face support member which supports a distal end lower face in a sheet transport direction during retention in a waiting mode and releases the support on the sheet distal end lower face during release of the retention; an alignment paddle member which aligns distal ends of the sheets held on the processing sheet during sheet alignment on the processing tray; and a rotary shaft allocated in association with a distal end face in the transport direction of the sheet retained in a waiting mode, and the rotary shaft moves the distal end lower face support member from a standby retention location to a retention release location by coaxially mounting and rotating the distal end lower face support member and paddle member, and moves the paddle member to a location in which the sheets are aligned.