| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sheet processing device capable of folding a sheet bundle without decreasing a folding speed, and an image forming device provided with the sheet processing device. SOLUTION: The sheet bundle Sa can be folded at a predetermined portion by pushing the predetermined portion of the sheet bundle Sa into a nip part N between a pair of rotating bodies 57a, 57b with a pushing-in means 55. It can be prevented that only a sheet Si, which directly contacts with the pair of rotating bodies 57a, 57b, is strongly and rapidly rolled in by setting a rolling force for rolling the sheet bundle Sa pushed into the nip part N between the pair of rotating bodies 57a, 57b so that its strength does not cause a sheet Si of the sheet bundle Sa, which contacts with the pair of rotating bodies 57a, 57b, to be separated from the other sheets.</p> |
