Vacuum printer

Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...

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Details

355 94, G03B 2720

Patent

active

044848137

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 juxtaposed over the blanket frame in snug 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, a vacuum source having a first vacuum conduit extending into communication with the printing chamber for evacuating it; the improvement which comprises a perforated blanket support plate within the blanket frame underlying the blanket and defining within the blanket frame a blanket chamber. A second vacuum conduit interconnects the vacuum source and the blanket chamber. An electronic control is connected to the conduits for evacuating the blanket chamber, and after a pre-set period evacuating the printing chamber. In the method of contact printing wherein the step of communicating vacuum to a vacuum printing chamber between a glass frame and a flexible blanket is preceded by the step of communicating vacuum to a blanket chamber below the blanket for a predetermined interval holding the blanket away from the glass frame until the vacuum printing chamber is fully evacuated.

REFERENCES:
patent: 2270578 (1942-01-01), Cambell
patent: 2287228 (1942-06-01), Cambell
patent: 2376416 (1945-05-01), Cambell
patent: 2494282 (1950-01-01), Cambell
patent: 3106145 (1963-10-01), Hutchins
patent: 3995955 (1976-12-01), Topfer

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