Patent ID: 7540482

Claim:
A post-processing apparatus which sequentially receives sheets one by one from an image forming apparatus to execute a post-process on the sheets, comprising: a first transport device which receives sheets delivered from the image forming apparatus and transports the sheets; a sheet overlap device which stays the sheets transported by the first transport device and causes another sheet transported sequentially by the first transport device, to overlap at least one stayed sheet; a second transport device which transports a plurality of sheets overlapping each other by the sheet overlap device; a plurality of stacking devices capable of stacking a plurality of sheets transported by the second transport device; and a controller which selects a stacking device which stacks a plurality of sheets transported by the second transport device, from among the plurality of stacking devices; wherein the controller controls a timing for sheet transport performed by the first transport device, according to the selected stacking device, to cause another sheet transported by the first transport device to overlap the at least one stayed sheet by shifting the another sheet in a sheet transport direction by a predetermined deviation amount.