B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
271/47
B41F 13/54 (2006.01) B41F 13/04 (2006.01) B41L 17/12 (2006.01) B41L 21/12 (2006.01)
Patent
CA 1303080
METHOD AND APPARATUS FOR INTERMITTENTLY PROCESSING SUCCESSIVE DEFINITE LENGTHS OF A CONTINUOUS FLEXIBLE WEB Abstract of the Disclosure A system is provided for intermittently processing succes- sive definite lengths of flexible sheet material in continuous web form, e.g., tractor-fed computer printout paper, with nearly tensionless transport of the web through web feeding operations, cyclical web processing and driving operations, and web delivery operations, that are not speed-interdependent. For each processing cycle, with the web extended without slack through an upstream lead to a processing station where a certain length of the web is positioned to be nest processed, an excess length of loose web is fed into that lead, typically forming a loop in it; then the certain web length is processed and driven forward a distance shorter than the length of loose web; and then web is retracted from the upstream lead to remove the residual loose web and leave a next certain web length in position to be processed. The processed web is delivered and may be folded into a pack as a downstream lead of it is made slack by web driven from the processing station. The system enables increased speeds of offset printing of paper such as continuous computer printout forms.
560899
Macrae & Co.
Van Pelt Equipment Corp.
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