Sheet processing apparatus having a staple detecting function

摘要

A sheet processing apparatus capable of shortening a time period required to determine whether or not a sheet bundle has been normally stapled, while suppressing an increase of apparatus size and an increase of apparatus manufacturing cost, and capable of stacking sheet bundles on a sheet discharge tray such that sheet bundles not normally stapled can be distinguished from normally stapled sheet bundles. When the absence of staple is detected in a sheet bundle by one or both of staple detecting sensors, sheet bundles starting from a sheet bundle to be discharged next are shifted on a processing tray, whereby a sheet discharge position of the next and subsequent sheet bundles on the sheet discharge tray is changed.

主权项

1. A sheet processing apparatus comprising:
a processing tray on which sheets are to be stacked; a stapler configured to staple a sheet bundle comprised of sheets stacked on said processing tray; a discharge unit configured to discharge the sheet bundle stapled by said stapler to a sheet discharge tray; a shift unit configured to shift a sheet bundle in a direction perpendicular to a direction of discharge by said discharge unit before the sheet bundle is discharged by said discharge unit; a detection unit configured to detect presence or absence of a staple in a sheet bundle that is being discharged by said discharge unit after said stapler operates; and a control unit configured to control an operation of said shift unit on a sheet bundle to be discharged next according to a result of detection by said detection unit, wherein in a case where the sheet bundle, for which said detection unit has detected that a staple is not present therein, has been shifted by said shift unit, said control unit controls said shift unit to not shift a sheet bundle to be discharged next, and wherein in a case where the sheet bundle, for which said detection unit has detected that a staple is not present therein, has not been shifted by said shift unit, said control unit controls said shift unit to shift a sheet bundle to be discharged next.