Thermo-electric transfer system for liquid toner
US5204722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Aug 19, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1695
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A thermo-electric image transfer system (50) for transferring a toned image directly to a paper or transparency medium in the absence of a liquid toner carrier. The medium is fed over a pre-heating platen (52) which drives excess moisture out of the medium. The medium is fed into a nip between first and second transfer rollers (64, 62). The first transfer roller (64) is heated so as to heat the backside of the medium, and includes a thermally and electrically conductive elastomeric layer (64A). A guide element (66) guides the medium out of the nip between the transfer rollers, and into another nip between the first transfer roller (64) and the photoconductor drum (68), with pneumatic cylinders maintaining pressure between the roller and drum. An electrostatic bias voltage is applied to the first roller (64) of a polarity opposite to that of the toner defining the image on the drum (68), to provide an electrostatic attraction of toner to the medium. The heat, pressure and electrostatic fields causes a toner image to be transferred to the medium from the drum (68). The medium is allowed to remain against the drum (68) to allow for cooling and adhesion to the medium, and thereafter is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.