Extremely high speed halftone screen positioning assembly

Details Extremely high speed halftone screen positioning assembly Extremely high speed halftone screen positioning assembly

1976-05-17

1978-03-21

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 71, G03B 2760

Patent

active

040800687

ABSTRACT:
A contact screen positioning device supports a flexible bowed halftone screen over a vacuum platen having a sheet of film thereon so that as the positioning device moves slowly down over the vacuum platen, central portions of the contact screen initially press against central portions of the platen and less and less centralized portions thereafter sequentially press against less and less centralized portions of said vacuum platen, to produce a rapid sweeping of air toward outer portions of the platen for rapid positioning of said screen over said platen without entrapped air pockets being formed between the screen and the film on the platen.

REFERENCES:
patent: 3063337 (1962-11-01), Anander
patent: 3068748 (1962-12-01), Schutt et al.
patent: 3433567 (1969-03-01), MacPhee et al.
patent: 3510217 (1970-05-01), Cirimele et al.
patent: 3547537 (1970-12-01), Betron

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