Film perforator

Details Film perforator Film perforator

1989-04-19

1990-05-29

Schran, Donald R.

Cutting

Tool engages work during dwell of intermittent workfeed

Work-feed element contacts and moves with work

23 33, 23133, 23110, 23276, B26F 102

Patent

active

049285629

ABSTRACT:
Disclosed is a film perforator having a punch unit, a pad roller and a feed roller which are disposed at the upstream side of the punch unit and support a film by nipping it between them, and a sprocket which is disposed at the downstream side of the punch unit and comes into engagement with punch-finished perforations, the sprocket and the feed rollers are connected by a pulley and the line speed of the sprocket is adjsuted to be a little higher than that of the feed rollers so that the film is caused to slip from its nipped position between the feed roller and the pad roller, whereby the film is exerted with backward tension so as to keep its proper flatness.

REFERENCES:
patent: 1291524 (1919-01-01), Howell
patent: 1416168 (1922-05-01), Carleton

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