Direct toner projection printing using an intermediate transfer medium
US5796422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1995 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Oct 17, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/4155
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An electrostatic printing apparatus includes a rotating transfer drum having an outer transfer surface. A plurality of direct toner projection units are positioned adjacent the transfer surface of the rotating transfer drum to project toner patterns of different colors onto the transfer surface in response to modulated signals. After the patterns are applied to the drum, they are transferred to paper and fused. The drum is constructed of two components: a base layer or core which is conductive, and a surface layer which is chosen primarily for its surface properties. The surface layer is conductive enough to allow toner particles to dissipate their electrical charges before additional toner is applied by downstream toner projection units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.