Sheet post-process apparatus

A sheet post-process apparatus comprising:

• a plurality of rollers which receive sheets from an MFP and convey the sheets forward;
• a waiting tray which is provided in a conveying path and holds the sheets conveyed from the rollers when the sheets need to be post-processed;
• a processing tray which holds the sheets conveyed from the waiting tray and the sheets conveyed via the conveying path without being conveyed to the waiting tray, before the sheets are post-processed, and which has a rear end positioned at upstream of a rear end of the waiting tray;
• a conveying mechanism which causes the sheets to fall, due to gravity, from the waiting tray onto the processing tray;
• a sheet-aligning mechanism which aligns the sheets with one another on the processing tray, at transverse edge and longitudinal edge, thereby forming a bundle of sheets;
• a post-process mechanism which performs a post-process on the bundle of sheets on the processing tray;
• sheet-conveying means for conveying the bundle of sheets from the processing tray;
• and
• a storage tray which holds the bundle of sheets conveyed from the processing tray.