Vacuum holder for sheet materials

Details Vacuum holder for sheet materials Vacuum holder for sheet materials

1994-02-14

1995-05-09

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 76, 355 91, 355 94, G03B 2760, G03B 2762, G03B 2764, G03B 2720

Patent

active

054144914

ABSTRACT:
A sheet material holder includes a vacuum platen defining a plurality of arrays of vacuum channels corresponding in number and size to a plurality of sheet material sizes on one surface thereof and including a corresponding plurality of distinct vacuum plenums communicating with the arrays of vacuum channels; a vacuum pump; a corresponding plurality of remotely actuatable valves connected between the vacuum plenums and the vacuum pump; a corresponding plurality of flow sensors for sensing the flow of air between the plenums and the vacuum pump; and logic and control means connected to the flow sensors and the valves for sensing air flow between a plenum and the vacuum pump and actuating the corresponding valve. Sheet size is automatically inferred by the pattern of valves that are actuated.

REFERENCES:
patent: 3584954 (1971-06-01), Nast
patent: 3610751 (1971-10-01), Miyauchi
patent: 4175857 (1979-11-01), Rapp et al.
patent: 4362380 (1982-12-01), Dragstedt
patent: 4378155 (1983-03-01), Nygaard
patent: 4440492 (1984-04-01), Howard
patent: 4984017 (1991-01-01), Nishida et al.

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