Device for applying a flexible halftone screen over a camera vac

Details Device for applying a flexible halftone screen over a camera vac Device for applying a flexible halftone screen over a camera vac

1975-10-28

1977-08-23

Adams, Russell E.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 72, 355 76, 355 87, 355125, 355133, G03B 2760

Patent

active

040436632

ABSTRACT:
A roller is coupled to a movable support frame which in a first position bears a flexible halftone screen which is fully wound up about said roller. As the support frame is translated in a first direction across the film mounted upon a vacuum platen, the flexible screen unwinds and is laid flat across the platen. When the movable support frame is translated in a second direction, the screen is thereafter wound up about said roller somewhat in the manner of a "reverse windowshade."

REFERENCES:
patent: 2155149 (1939-04-01), Rutherford
patent: 3068748 (1962-12-01), Schutt et al.

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