Method of producing lithographic plates

Details Method of producing lithographic plates Method of producing lithographic plates

1985-05-28

1986-01-07

Wintercorn, Richard A.

Photocopying

Contact printing

Methods

355 91, G03B 2702

Patent

active

045630852

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: 2173168 (1939-09-01), Hughes
patent: 2174882 (1939-10-01), Huebner
patent: 2842037 (1958-07-01), Gobeille et al.
patent: 3176601 (1965-04-01), Bradley
patent: 3625611 (1971-12-01), Orr et al.
patent: 3635560 (1972-01-01), Hulen
patent: 3771870 (1973-11-01), Taylor
patent: 4423955 (1984-01-01), Powers
patent: 4529303 (1985-07-01), Ternes

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