Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1989-10-31
1991-02-26
Wintercorn, Richard A.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
355132, G03B 2720, G03B 2702
Patent
active
049965603
ABSTRACT:
An apparatus for exposing of an image of an original film on photosensitive material, the film and the photosensitive material being held together by vacuum contact between a transparent plate and a flexible sheet. The apparatus includes a squeegee unit which moves while pressing the flexible sheet. The squeegee unit forcibly moves the air, thereby speeding up the setting of the vacuum contact. The apparatus also includes a speed changing unit for changing the speed of the squeegee unit depending on the resistance of the air to movement. If the air moves easily, the squeegee unit moves rapidly. If the air does not move easily, the squeegee unit moves slowly, or the squeegee unit stops for a prescribed period and then, after the air is removed, is restarted. Thus, complete removal of air is carried out rapidly.
REFERENCES:
patent: 2739516 (1956-03-01), Hosterman
patent: 4029404 (1977-06-01), Mizukami et al.
patent: 4316669 (1982-02-01), Tachiki
patent: 4437759 (1984-03-01), Mizukami et al.
patent: 4526463 (1985-07-01), Hickey et al.
patent: 4774552 (1988-09-01), Nishihama et al.
Nanri Seiji
Ohno Takashi
Ueno Masatoshi
Dainippon Screen Mfg. Co,. Ltd.
Wintercorn Richard A.
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