| 摘要 |
A sheet folding device (23) includes a first folding unit (33), a retreat path (34), a sheet retaining mechanism (35), and a second folding unit (37). The first folding unit (33) forms a first fold in a sheet. The retreat path (34) is entered by the sheet having the first fold formed by the first folding unit (33), and has a stop portion (54) to be contacted by the first fold. The sheet retaining mechanism (35) moves a movable member (81) with respect to the sheet that enters the retreat path (34), and regulates movement of the sheet in the retreat path (34) in a direction of thickness of the sheet. The second folding unit (37) forms a second fold in the sheet having the first fold while allowing the sheet that has contacted the stop portion (54) to exit the retreat path (34). |
