Apparatus for producing lithographic plates

Details Apparatus for producing lithographic plates Apparatus for producing lithographic plates

1983-06-02

1985-07-16

Wintercorn, Richard A.

Photocopying

Contact printing

Fluid pressure retention of carrier and receiver in exposure...

G03B 2720

Patent

active

045293031

ABSTRACT:
A vacuum frame is provided with a work surface with a known reference center point. Two vacuum chambers on the underside of the work surface are included for a lithographic plate and an image carrier. Vacuum motors associated with the two vacuum chambers, upon actuation, cause the lithographic plate and image carrier to be tightly drawn up against the work surface through a plurality of small apertures formed through the work surface and communicating with the vacuum chamber. A plurality of arrays of registering pins are disposed in the work surface, each array having a known relationship; to the center of the work surface. Each registering pin is adjustable to be flush with or project at selected elevations above the work surface.

REFERENCES:
patent: 3635560 (1972-01-01), Hulen

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