Vacuum frame for offset printing plates

Details Vacuum frame for offset printing plates Vacuum frame for offset printing plates

1983-06-02

1984-10-09

Burr, Edgar S.

Printing

Printing members

Plate mountings

101407BP, 269 21, B41F 2700

Patent

active

044754582

ABSTRACT:
A vacuum frame for holding at least one negative and a plate for exposure to intense light to transfer the negative image to the plate to fashion a printing plate. The frame has a base with a flat upper surface to support the plate and negative. A plurality of apertures are disposed about the periphery of the upper surface, the apertures communicating with a vacuum source. Overlying the upper surface and the apertures is a mesh material which defines a multiplicity of small air passages over the upper surface. The plate and negatives are supported on the mesh material and upper surface and are aligned by suitable aligning means. A flexible transparent cover is positioned over the upper surface to cover the negative, plate and mesh material. The evacuation of air through the apertures and air passages causes the cover, negative and plate to be held closely together and to the base for exposure of the plate.

REFERENCES:
patent: 1914127 (1933-06-01), Huebner
patent: 2597178 (1952-05-01), Pleydell et al.
patent: 2914289 (1959-11-01), Schutt
patent: 3294392 (1966-12-01), Dunham
patent: 3453957 (1969-07-01), Hamilton
patent: 3958508 (1976-05-01), Sakurai
patent: 4005653 (1977-02-01), Arkell
patent: 4049484 (1977-09-01), Priest et al.

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