| 摘要 |
<p>A knife folder (60) for folding output sheets from a copier or other machine has a pair of folding cylinders (66,67) forming a nip between which the sheets are folded, and a blade (70) which guides the sheets towards the nip. Pairs of nip rollers (61,62) are located adjacent the folding cylinders. The nip rollers and the blade are fixedly mounted together and can be moved towards the folding cylinders such that the blade gently buckles the sheet into engagement with the folding cylinders without the blade itself actually engaging the cylinders. The nip rollers are simultaneously brought into engagement with the folding cylinders. The buckled sheet is thus driven into the nip between the folding cylinders for the fold to be completed before being ejected. This arrangement ensures positive sheet acquisition with minimal risk of the blade damaging the sheet.</p> |
