Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1986-02-11
1987-06-02
Hayes, Monroe H.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
355 76, 355 92, G03B 2720
Patent
active
046698701
ABSTRACT:
A vacuum contact system has a vacuum contact frame including a bi-layer blanket having top and bottom layers spaced apart by a number of parallel strip members to define a first space. A bead is positioned around the outer edges of the top layer to support a glass plate so that a second space is formed. Vacuum connectors communicate with the second space and a further vacuum connector communicates with the first space, all the connectors being connected to a vacuum pump. The first and second spaces have the atmosphere therein controlled by electromagnetic valves located in a vacuum circuit with the pump.
In operation a film master and a presensitized material are located in the second space and the vacuum circuit is arranged to remove air from both the first and second spaces so that the two layers of blanket are drawn together. Ridges formed by the strip members are thus formed in the top layer outer surface and these ridges press the film master and presensitized material against the glass plate. The vacuum circuit is then arranged to vent the space between the two blanket layers to atmosphere so that overall contact of the blanket layer is made against the film master and presensitized material which are thus sandwiched between the blanket layer and the glass plate substantially over the whole area of the film master.
REFERENCES:
patent: 4484813 (1984-11-01), Maher et al.
patent: 4551016 (1985-11-01), Maher et al.
Hayes Monroe H.
Parker Graphics Limited
LandOfFree
Vacuum contact system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vacuum contact system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vacuum contact system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-609752