Photocopying – Projection printing and copying cameras – Detailed holder for photosensitive paper
Patent
1981-04-07
1983-03-29
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Detailed holder for photosensitive paper
355 76, G03B 2760
Patent
active
043781551
ABSTRACT:
A suction film holder preferably for a reproduction camera and comprising a plate with channels opening outwards and communicating with a suction means. The known suction holders comprise a plurality of concentric chambers mutually communicating through valves, only the intermediary chamber being connected to the suction source. The sheet in question may therefore neither be of an arbitrary size nor be arbitrarily located. According to the invention the channels uniformly dispersed across the entire plate are individually connected to the suction means through at least one valve, said valve closing when a heavy flow takes place and slightly opening when substantially the same pressure is present on both sides thereof. In this manner the sheet may have an arbitrary size and be arbitrarily located. A plurality of channels always open on to the back of the sheet, the valves of said channels slightly opening when substantially the same pressure is present on both sides of the valve, i.e. a low pressure retaining the sheet. The valves located in the channels opening on outside the sheet close.
REFERENCES:
patent: 2694337 (1954-11-01), Anander
patent: 3307816 (1967-03-01), Cocito
patent: 3307817 (1967-03-01), Cocito
patent: 3307818 (1967-03-01), Cocito
patent: 3307819 (1967-03-01), Cocito
Ebert Michael
Eskofot A/S
Wintercorn Richard A.
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