Ribbon feed with ink depletion compensation
US4619537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1985 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | May 23, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J31/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Where the ribbon advance mechanism of a printer is driven by the motion of the print head carrier, ink in the ribbon will be differentially depleted depending upon the density of print. This varied depletion becomes a problem for printers capable of printing high density graphics images, particularly color filled images. In accordance with this invention, the printing density is monitored and when the printing density exceeds a predetermined value, the print head is caused to be moved an amount greater than that necessary to position the print head at a succeeding print position so as to thereby cause additional ink ribbon to be advanced and to avoid overprinting on areas of the ribbon where high density printing has occurred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.