Patent ID: 6339685
Filing Date: 2002-01-15
Classification: B65H,G03G,H04N

Abstract:
A sheet processing apparatus which can be connected to an image formation apparatus and stacks image-formed sheets on which images were formed by said image formation apparatus, comprising:first stacking means for stacking the sheets; conveyance means for conveying the sheets stacked on said first stacking means and the image-formed sheets from said image formation apparatus; second stacking means for stacking the sheets conveyed by said conveyance means from said first stacking means and the image-formed sheets conveyed by said conveyance means from said image formation apparatus; size detection means for detecting sizes of the sheets stacked on said first stacking means; abnormality detection means for detecting sheet conveyance abnormality of the sheets conveyed by said conveyance means on the basis of a condition for detecting the sheet conveyance abnormality; and control means for starting to convey the sheets stacked on said first stacking means by said conveyance means prior to the sheet size detection by said size detection means, and for controlling to make the condition of said abnormality detection means before sheet size determination by said size detection means differ from the condition of said abnormality detection means after the sheet size determination by said size detection means.