Electrostatic printing apparatus comprising improved electrode drive means
US4262294A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1978 |
| Grant date | Apr 14, 1981 |
| Priority date | — |
| Expiry date | Jul 31, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/41
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sheet of copy paper (24) is moved perpendicular to a linear array (22) of printing electrodes (221, 222, 223, 224 . . . ). The electrodes (221, 222, 223, 224 . . . ) are selectively energized to form an electrostatic charge pattern on the copy sheet (24) corresponding to one horizontal scan line of an original document. The electrostatic charge pattern is developed by a toner and the resulting toner image fixed to the copy sheet (24). The electrodes (221, 222, 223, 224 . . . ) are divided into a first set (221, 223, 225 . . . ) and a second set (222, 224, 226 . . . ), the electrodes in the second set (222, 224, 226 . . . ) being alternatingly spaced from the electrodes in the first set (221, 223, 225 . . . ) along the length of the array (22). The first set (221, 223, 225 . . . ) of electrodes are selectively energized during a first time period (t1) and the second set (222, 224, 226 . . . ) of electrodes are selectively energized during a subsequent second time period (t2). The second time period (t2) may be made longer than the first time period (t1) and/or a voltage (V2) applied to the second set (222, 224, 226 . . . ) of electrodes may be made higher than a voltage (V1) appli…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.