SHEET PROCESSING APPARATUS AND SHEET FOLDING METHOD AND IMAGE FORMING APPARATUS

摘要

According to one embodiment, a sheet processing apparatus pushes, with a folding plate, a sheet bundle held by a stacker into a nip portion formed by a first folding roller and a second folding roller and forms a fold. The first folding roller includes a first folding section configured to come into contact with the second folding roller and form the nip portion and a first groove configured to form a gap between the first groove and the second folding roller in a state in which the first folding section is in contact with the second folding roller. The first groove is formed in a position where an end in the width direction of a sheet bundle of a predetermined size pushed in by the folding plate passes.