Digital copier including means for erasing digital image data over a given area, especially suitable for preventing jamming of paper
US5200837A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1990 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Apr 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/295
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital copier for recording image data representative of a document image on a paper sheet by digitally processing the image data and capable of forming a blank area in a leading edge portion of the paper sheet to prevent the sheet from wrapping round a fixing roller. Digital image data representative of a document image is erased over a predetermined area in a subscanning direction, while the erasing area is variable depending on positive-negative reversal/non-reversal. The blanking control area is varied in response to the number of black pixels included in the image data and to conditions particular to a paper sheet used. Black pixels included in the digital data are counted in matching relation to the reversal/non-reversal, whereby a blank area in a leading edge portion of a paper sheet is controlled. When the reversal is not effected, the blank area in a leading edge portion is controlled on the basis of the number of black pixels; when it is effected, the blank area is controlled on the basis of the number of white pixels. The blank area is varied on the basis of the number of black pixels and the conditions of a paper sheet, while the omission of the image in the leading …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.