Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1984-09-26
1985-11-05
Adams, Russell E.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
G03B 2720
Patent
active
045510164
ABSTRACT:
In a vacuum printer for the graphic arts having a bed, a blanket frame upon the bed including a flexible impervious blanket having a peripheral sealing bead, a glass frame including a glass, with the glass in snug flexing and sealing registry with the blanket bead defining a contact printing chamber, the glass frame being movably mounted for opening and closing movements relative to the blanket frame, and a vacuum source having a first vacuum conduit communicating with the printing chamber for evacuating it; the improvement which comprises a non-metallic base plate positioned within and yieldable mounted upon the blanket frame supportably underlying the blanket. A flexible apertured skirt at its outer and inner periphery is sealed respectively upon the blanket frame and the base plate, defining with the blanket a vacuum chamber connected by a second conduit to the first conduit. A control is connected to the second conduit to simultaneously evacuate the vacuum chamber for a limited interval, and regulate its vacuum level by the controlled flow air into the vacuum chamber during its evacuation.
REFERENCES:
patent: 2257581 (1941-09-01), Ulsheimer
patent: 2270578 (1942-01-01), Campbell
patent: 2287228 (1942-06-01), Campbell
patent: 2376416 (1945-05-01), Campbell
patent: 2494282 (1950-01-01), Campbell
patent: 3106145 (1963-10-01), Hutchins
patent: 3995955 (1976-12-01), Topfer
Maher Robert J.
Tooson Ronald
Adams Russell E.
Brown Brian W.
Douthitt Corporation
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