Distinguishing the propriety of the image which after the sheet was formed on

摘要

PROBLEM TO BE SOLVED: To provide a sheet post-processing unit which can efficiently continue a post-processing without incurring any error in page order by eliminating an unsuitable sheet outside a path by discriminating the sheet on which an image is formed.;SOLUTION: A discrimination means for discriminating whether or not the image is suitable is provided in a sheet discriminating path P1 for supplying the sheet to a post-processing section and in addition, there are provided an eject tray 55 for extracting the unsuitable sheet based on the discriminated result and a buffer tray 54 for temporarily stacking a subsequent sheet. The buffer tray 54 is configured to store a plurality sheets and to send the same toward the post-processing section in the stored order. Then, a control means is provided for supplying the sheet which is held in the buffer tray 54 to the post-processing section following a normal sheet when the suitable normal sheet is supplied again to the sheet discriminating path P1.;COPYRIGHT: (C)2011,JPO&INPIT