Patent ID: 7520499

Claim:
A sheet post-process apparatus, comprising: a plurality of rollers which receive sheets transferring sequentially from an MFP and convey the sheets forward; a waiting tray which is provided in a conveying path and holds some of the sheets conveyed from the rollers that are part of a bundle of sheets while previously transferred sheets are being post-processed; a processing tray which holds the sheets held on and conveyed from the waiting tray and sheets conveyed via the conveying path without being conveyed to the waiting tray that complete the bundle of sheets, wherein the waiting tray opens and closes by a sliding reciprocating motion in a direction of a sheet width with respect to a conveying direction of the conveyed sheets and causes the sheets held on the waiting tray to fall in an opening created by opening of the sliding reciprocating motion of the waiting tray, due to gravity, onto the processing tray; a sheet-aligning mechanism which aligns the bundle of sheets held on the processing tray with one another, at a transverse edge and a longitudinal edge; a post-process mechanism which performs a post-process on the bundle of sheets on the processing tray; a sheet-conveying mechanism which conveys the bundle of sheets from the processing tray; and a storage tray which holds the bundle of sheets processed on the processing tray.