| 摘要 |
PROBLEM TO BE SOLVED: To suppress a state in which a folded sheet bundle is opened more widely than in an expected state.SOLUTION: The post-processing device in the invention comprises: a compile tray 31 for bundling plural sheets together for forming a sheet bundle B81; and a folding knife 35 for forming a crease on the sheet bundle B81 for folding the sheet bundle B81. The folding knife 35 forms folding stripes C1, C2 and a folding part R different from the folding stripes C1, C2 on the sheet bundle B81, and then folds the sheet bundle B81 not at the folding stripes C1, C2 but at the folding part R. |
