Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1992-04-03
1993-04-27
Wintercorn, Richard A.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
G03B 2720
Patent
active
052066800
ABSTRACT:
A contact print frame of the type which is especially adapted to move one or more transparent films (7) into intimate contact with a light sensitive printing plate (11), a light sensitive collection film or any other light sensitive medium and to expose/print said one or more transparent films (7) onto said light sensitive medium (11), and comprising a supporting transparent glass, named contact glass (1), which has, as conventional, vacuum grooves (5, 6) at the bottom surface thereof for vacuum connecting an original/master film (7) and eventually also a masking film to said contact glass (1), and which is arranged to be pressed into contact with the printing plate (11) etc. during the exposure/printing process, and an assisting glass (2) which is carried by the contact glass (1) and which is sealingly connected thereto on a slight distance above the upper surface of the contact glass (1), an air pressure chamber (14) formed between the the sealingly interconnected contact and assisting glasses (1, 2), means (4) for putting said air pressure chamber (14) under a slight positive pressure, so that the contact glass (1) is thereby cambering slightly convexly towards the printing plate (11) while the contact print frame with the contact glass (1) is being moved into contact with the printing plate (11).
REFERENCES:
patent: 4523840 (1985-06-01), Hagedorn-Olsen
patent: 4704028 (1987-11-01), Richards, Sr.
patent: 5017960 (1991-05-01), Tuulse
Misomex AB
Wintercorn Richard A.
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