Dual roller apparatus for pressure fixing sheet material
US5195430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Nov 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/2064
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixing and developing apparatus in which sheet material to be treated is passed through a high pressure nip defined by a pair of rollers. At least one of the rollers may have a composite construction. The composite roller includes an elongated tubular shell with a pressure applying external surface, an elongated core positioned within the tubular shell, and an elastomeric material disposed between the core and shell to support the shell on the core. The core may be of a number of configurations and may increase in transverse cross-sectional dimension from the respective ends of the core toward the center of the core. The core may taper continuously or in discrete steps from its center toward its first and second ends. In addition, the core may have a longitudinal cross-section with a crown in the shape of a beam deflection curve for a simply supported, uniformly constant cross-section beam. The shell may be similarly configured along its interior surface. Also, the elastomer may be compressed at the center of the roller relative to the ends of the roller to preload its center portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.