Flat field, roll film transport

Details Flat field, roll film transport Flat field, roll film transport

1976-11-22

1978-06-13

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Image transferred from individual documents to film strip

352224, G03B 2732, G03B 2752

Patent

active

040946037

ABSTRACT:
A film transport capable of periodically advancing roll film to present a flattened portion of the film at an exposure station between the supply and take-up spools. As originally developed the invention is applied to processing sensitized photographic film. Such a film, even when tightly rolled upon a spool, will exhibit a tendency to curl and bow transversely when unwound from the spool, the face of the film carrying the emulsion curving inwardly. This film transport as an accessory to a paper printer periodically presents to an "enlarger" in the printer successive frame portions of 35mm film or the like, in place of the regularly dispensed sensitized paper, while eliminating the hazard of damage to the image area of the film, this latter feature being achieved by non-use of any pressure plate or hold-down springs which might abrade the film surface and the substitution of means to exert a reverse bending strain on the film and thus to achieve a localized flattening of the film at the exposure station.

REFERENCES:
patent: 1638392 (1927-08-01), Case
patent: 2600636 (1952-06-01), Goetz et al.
patent: 3033074 (1962-05-01), Schaefer
patent: 3113498 (1963-12-01), Kallenberg
patent: 3547536 (1970-12-01), Phleps
patent: 3994581 (1976-11-01), Hopkins et al.

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