Electrophotographic printer with print justification control
US5177508A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Oct 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electrophotographic printer 10 is described having a print justification control for controlling the justification of the print should the linear speed of the print media 12 passing through the printer 10 be out of synchronization with the rotation of the photo conductive drum 40. The printer has a scan sensor 82 for scanning each scan line. A processor 90 compares the number of actual scan lines to a desired number of scan lines for each print media segment. A print moving sensor is provided to generate a signal for each movement of a print segment of the media. A comparison is made by the processor 90 to determine the number of actual image information scan lines placed in each media segment and for duplicating scan lines should the number of actual scan lines exceed a preset number. If the linear speed of the print media is greater than the circumferential speed of the electro conductive drum, then a processor 90 deletes scan lines. The printer 10 includes a print control system 86 that has an all-white scan line sensor circuit 112 that senses the presence of an all-white image information scan line. This information is provided to the processor 90 to duplicate such an all-wh…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.