Vacuum contact type printing machine and method of contact there

Details Vacuum contact type printing machine and method of contact there Vacuum contact type printing machine and method of contact there

1989-09-20

1991-01-08

Hix, L. T.

Photocopying

Contact printing

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

G03B 2720

Patent

active

049840177

ABSTRACT:
A vacuum contact type printing device, for carrying out printing with an original film and a photosensitive material maintained in contact with each other, includes a flexible sheet on which the photosensitive material is placed, a sheet holding portion provided below the sheet, an original holding portion for holding an original facing the sheet, and a sealable exposure chamber containing the sheet, the sheet holding portion and the original holding portion. Switching valves for switching the pressure of the central portion and of the peripheral portions of the sheet holding portion between a reduced pressure and the atmospheric pressure are provided at the central and peripheral portions. A vacuum pump is connected to the exposure chamber to reduce the pressure of the exposure chamber, and a pressure sensor for detecting the pressure in the exposure chamber is provided. The pressure between the sheet and the sheet holding portion is switched by the switching valves successively from the central portion outwardly to peripheral portions and from the reduced pressure to the atmospheric pressure in response to the output from the pressure sensor.

REFERENCES:
patent: 4484813 (1984-11-01), Maher et al.
patent: 4580892 (1986-04-01), Nishida et al.
patent: 4714947 (1987-12-01), Nishida et al.
patent: 4737824 (1988-04-01), Sakai et al.
patent: 4764794 (1988-08-01), Fujii
patent: 4812883 (1989-03-01), Ohlig

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