| 摘要 |
To provide a folding mechanism for folding a sheet with a simplified structure having no fear of causing a deviation from the fold position, wrinkle and the like, provided are a transport path 33 for transporting a sheet, and folding processing means 48 disposed in the transport path to fold the sheet. Then, the folding processing means is comprised of folding roll pairs (41b, 49, 50) coming into press-contact with one another to rotate in the opposite directions, and folding deflecting members (53, 54) for guiding the fold of the sheet to the nip portions (Np1, Np2) of the folding roll pairs. Then, the folding deflecting members are provided with driven rollers (53a, 54a) in contact press-contact with the roll periphery of one of the folding roll pair, and curved guides (53a, 54a) along the roll periphery of the other one. The driven roller provides the sheet with transport force to guide to the nip portion, and the curved guide brings the sheet along the roll periphery of the other one to guide to the nip portion.
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