Pneumatic pressure pad for cyclical even application of pressure

Details Pneumatic pressure pad for cyclical even application of pressure Pneumatic pressure pad for cyclical even application of pressure

1991-06-04

1992-05-12

Hayes, Monroe H.

Photocopying

Contact printing

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

355 87, 355 73, 355 76, G03B 2720

Patent

active

051132192

ABSTRACT:
A pneumatic pressure pad within an exposure stage of a microfiche duplication equipment cyclically reliably evenly progressively pressures a microfiche master film into uniform pressured contact with an unexposed film in order that the unexposed film may be exposed from the master film without appreciable distortion. A housing of the pneumatic pressure pad defines a chamber divided into separate volumes by a flexible diaphragm. A pneumatic source cyclically applies a differential air pressure between the chamber's two volumes and across the flexible diaphragm. Outside of the housing, an elastomeric pressure pad presents a substantially planar precision crowned surface in a direction oriented towards the planes of each of the unexposed and exposed films. A shaft connects the diaphragm to the pressure pad. Pneumatic movement of the diaphragm cycles the pressure pad in a direction orthogonal to the planes of the films, thereby to cyclically pressure the films into contact without inducing bowing, warping, wrinkles, or other distortions in either film.

REFERENCES:
patent: 2451161 (1948-10-01), Fairbanks
patent: 3156462 (1964-11-01), Weaver
patent: 3318219 (1967-05-01), Anderson
patent: 3355829 (1967-12-01), Butterbaugh
patent: 3413903 (1968-12-01), Maldarelli
patent: 3510217 (1970-05-01), Cirimele et al.
patent: 3797797 (1974-03-01), Keller

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