Platen cover for a vacuum contact printer

Details Platen cover for a vacuum contact printer Platen cover for a vacuum contact printer

1975-11-07

1977-06-14

Hix, L. T.

Photocopying

Contact printing

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

355 76, 355 99, G03B 2762

Patent

active

040294048

ABSTRACT:
In a vacuum contact printer there are provided a winding roller to which one end of a resilient vacuum sheet is attached and a pressure roller for pressing the sheet against a glass plate. Along with the advancement of both rollers, which are rotatably supported on a pair of bearing plates movable in a longitudinal direction, the sheet automatically spreads over the glass plate, being wound off the winding roller and simultaneously being pressed by the pressure roller so that all the air kept between the sheet and the glass plate is completely expelled. In addition, a suctorial operation encourages a closer adhesion of the sheet to the glass plate, whereby a document and a sensitive material placed between them can be sufficiently in close contact with each other. On the other hand, along with the retraction of both rollers, the sheet is automatically and perfectly wound up around the winding roller without any slack or rumple caused thereon, since the pressure roller is raised slightly above the sheet by means of cam plates so as to put no pressure on the sheet.

REFERENCES:
patent: 2584401 (1952-02-01), Thralls
patent: 3560089 (1971-02-01), Jones
patent: 3635559 (1972-01-01), Harrell et al.
patent: 3944367 (1976-03-01), Hakanson et al.

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