Patent ID: 6353726
Filing Date: 2002-03-05
Classification: B65H,G03G

Abstract:
A sheet processing apparatus comprising:a first stacking tray connectable to an image forming apparatus and on which sheets are stacked; a conveyor for conveying a sheet loaded on said first stacking tray and a sheet on which an image has been formed by said image forming apparatus; and a second stacking tray for stacking the sheets conveyed from said first stacking tray and the sheet on which an image has been formed by said image forming apparatus; wherein sheet processing is performed on the sheet conveyed by said conveyor from said first stacking tray, according to an operation mode of said image forming apparatus, said sheet processing apparatus comprising: detecting means for detecting a skew amount of a sheet conveyed from said first stacking tray; determining means for determining whether to perform sheet processing by said sheet processing apparatus; and control means for controlling conveyance of the sheet by said conveyor based on a skew amount of the sheet detected by said detecting means and a determination result of said determining means, wherein said control means inhibits conveyance of a sheet by said conveyor if a detected skew amount of a sheet detected exceeds a first predetermined skew amount and said determining means determines to perform said sheet processing, and permits conveyance of a sheet by said conveyor if the detected skew amount of the sheet exceeds the first predetermined skew amount and said determining means determines not to perform said sheet processing.