Three-roll fuser with center pressure roll for black and color application
US5296904A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1993 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Mar 31, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/209
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A three roll fuser system for a xerographic machine includes a reversibly drivable central pressure roll, a first fuser roll located adjacent the central pressure roll forming a first fuser nip with the central roll, and a second fuser roll located adjacent the central pressure roll on a substantially opposite side of the central pressure roll as the first fuser roll forming a second fuser nip with the central roll. Copy sheets having an unfused image on a side thereof are transported from an inlet through one of the first and second nips to fuse the image on the copy sheet and then transported to an outlet. The three roll fuser system is capable of selectively fusing either side of a copy sheet without requiring extra sheet inverting devices. In a preferred embodiment, the fuser rolls have differing physical properties and can be operated under different operating conditions such as fuser temperature and speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.