| 摘要 |
According to an embodiment, a sheet folding apparatus includes: a conveying roller pair configured to convey a sheet; a conveying path provided on a downstream side of the conveying roller pair, an opening being formed in a part of the conveying path if the sheet is triple-folded and being closed if the sheet is double-folded; a retracting conveying path, an inlet of which is opened to the opening of the conveying path and an outlet of which is closed by a stopper, the retracting conveying path leading the front end of the sheet, which is conveyed through the conveying path, from the inlet to the stopper and temporarily retracting the front of the sheet if the sheet is triple-folded; a first folding roller pair disposed near the inlet of the retracting conveying path, the first folding roller pair nipping, if the sheet is triple-folded, a bend caused by pushing of the sheet led by the conveying rollers into the retracting conveying path to form a first fold and nipping, if the sheet is double-folded, the front end of the sheet, which is conveyed through the closed conveying path, and conveying the sheet further downstream; and a second folding roller pair configured to further form a second fold in the sheet on which the first fold is formed to triple-fold the sheet, and form only the second fold in the sheet on which the first fold is not formed to double-fold the sheet.
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