Zigzag folding device

Details Zigzag folding device Zigzag folding device

1994-08-11

1996-09-03

Lavinder, Jack W.

Manufacturing container or tube from paper; or other manufacturi

Bending

Folding

493419, B65H 4516

Patent

active

055519393

ABSTRACT:
A folding device for the zigzag folding of a sheet, including two pairs of folding rollers which form two folding nips and which rollers are drivable alternately in opposite directions of rotation, and a pair of feed rollers which alternately feed a sheet for folding to the folding nips, the speed of conveyance of the folding rollers being initially 120% of the speed of conveyance of the feed rollers and, after passage of the leading sheet edge through the first of the two folding nips, it is 110% of the speed of conveyance, wherein after each reversal of direction of rotation of the folding rollers, the speed of conveyance of the folding rollers is initially 110% of the speed of conveyance of the pair of feed rollers and, shortly after passage of a fold made in the associated folding nip, it is 100% thereof. For realizing a desired folding length the set process time between the start of a folding cycle and the change of the direction of drive of the folding rollers is automatically adjusted in dependency of this folding length (V) and the total sheet length (L).

REFERENCES:
patent: 3747917 (1973-07-01), Roda
patent: 4425696 (1995-06-01), Hara
patent: 4484905 (1984-11-01), Ashburner
patent: 5344379 (1994-09-01), Garrone

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