Patent ID: 7726638
Filing Date: 2010-06-01
Classification: B65H

Abstract:
1. A sheet processing apparatus, which performs a bookbinding process by folding a sheet stack, comprising: a folding roller pair comprising a first roller and a second roller brought into press contact with the first roller to be contacted/separated with/from the first roller, for conveying the sheet stack while folding the sheet stack; a plurality of urging members capable of urging the second roller in a direction of the first roller; and an urging mechanism for changing a number of the urging members for urging the second roller, according to a thickness of the sheet stack to be folded; wherein the urging mechanism comprises a swingable holding member for holding the second roller to be contacted/separated with/from the first roller, and change the number of the urging members for urging the second roller, along with fluctuation of the holding member.