Progressive directional evacuation of vacuum copy frames

Details Progressive directional evacuation of vacuum copy frames Progressive directional evacuation of vacuum copy frames

1986-06-06

1987-06-30

Wintercorn, Richard A.

Photocopying

Contact printing

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

355 73, G03B 2720

Patent

active

046766332

ABSTRACT:
The present invention provides an improved vacuum frame having upper and lower frame members of rectangular shape, the upper one of which supports a plate of glass. Connected to the lower frame is a flexible sheet such as a rubber sheet with a backing member connected to its lower surfae. Resilient members such as springs urge one edge of the sealing sheet upwardly toward the glass plate and the other edge downwardly away from the glass plate to produce a wedge shaped vacuum chamber which upon being evacuated becomes progressively smaller as air is progressively and directionally removed proceeding from one edge of the glass plate to the other.

REFERENCES:
patent: 2739516 (1956-03-01), Hosterman
patent: 2774289 (1956-12-01), Collins
patent: 2929309 (1960-03-01), Young
patent: 3625611 (1971-12-01), Orr et al.
patent: 3995955 (1976-12-01), Topfer
patent: 4080068 (1978-03-01), Madigan et al.
patent: 4551016 (1985-11-01), Maher et al.

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