Pneumatic pressure pad for cyclical even application of pressure forces, particularly for contact duplication
US5113219A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jun 4, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/20
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.