Patent ID: 8023881
Filing Date: 2011-09-20
Classification: G03G

Abstract:
1. A sheet finisher having a post-processing section that conducts post-processing on a sheet on which an image has been formed by an image forming apparatus, the sheet finisher comprising: (a) an intermediate storing section in which a plurality of sheets conveyed from the image forming apparatus are superposed to be stored temporarily; (b) a pair of conveyance rollers that convey the plurality of sheets stored in the intermediate storing section to the post-processing section while the plurality of sheets are superposed, wherein the pair of conveyance rollers rotate in a sheet conveyance direction; (c) two drive motors, wherein each of the two motors drives one of the pair of conveyance rollers that comes in contact with one sheet of the plurality of sheets and the other of the pair of conveyance rollers that comes in contact with the other sheet of the plurality of sheets, separately; (d) a sheet displacement amount information obtaining section which obtains an amount of a sheet displacement of the superposed plurality of sheets relative to each other in the sheet conveyance direction, which is generated downstream of the intermediate storing section; and (e) a correction controller that controls a rotation speed of at least one of the two drive motors based on the obtained amount of the sheet displacement so that the sheet displacement amount is eliminated.