| 摘要 |
A sheet folding apparatus for folding a bundle of sheets at its center includes a pair of center-folding rollers including a first roller and a second roller. Each roller is rotatable about an axis thereof. The first roller and the second roller are pressed in contact with each other to define a nipping portion, but are separable from each other. A center-folding blade projects towards the nipping portion for pushing a folding portion of the bundle of sheets into the nipping portion. The pair of center-folding rollers nips and conveys the folding portion to fold the bundle of sheets into a two-fold. A pivotal shaft is provided for swingably supporting the center-folding blade. A projecting leading end of the center-folding blade is swung in accordance with the thickness of the bundle of sheets that is to be folded at its center.
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