Bidirectional transport of sprocketed film

Photocopying – Contact printing – Machine

Patent

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Details

226 2, 226 49, 355132, G03B 2710

Patent

active

039703860

ABSTRACT:
In a bidirectional continuous contact printer for sprocketed film, sprocket holes in a raw film and a master film engage teeth in a sprocket wheel located at an exposure aperture. Between one storage reel and the sprocket wheel, the raw film and the master film pass over tensioning means that draw one edge of the sprocket holes of the raw film and the master film that engage the teeth of the sprocket wheel against such teeth to align the sprocket holes of the films. The tensioning means draw the same edge of the sprocket holes against the teeth in the sprocket wheel during both directions of film transport. In one direction of film transport, the sprocket wheel pulls the film past the exposure aperture, and in the other direction of film transport, the tensioning means pull the film past the exposure aperture. In both directions of film transport, the relative film position is controlled well enough to meet high quality film printing standards.

REFERENCES:
patent: 2205540 (1940-06-01), Phillimore
patent: 2933031 (1960-04-01), Friedel
patent: 3382787 (1968-05-01), Jeffee et al.

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