Dot position discrepancy correcting circuit for printing apparatus
US4956648A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Jul 5, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/125
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printer driving circuit for a printer having a printer head which is mounted to scan perpendicularly to a direction in which a sheet to be printed upon is fed, the printer head including a plurality of dot printing units arranged on the head so that the units are spaced from one another by respective separation distances in the direction of head scanning, the printer driving circuit includes: a detector for detecting the position of the head; a picture memory for storing print data associated with at least one scan by the printer head at addresses corresponding to printed pixel locations on the sheet; a position generator coupled with the detector for generating information related to respective positions of the printing units on the sheet; a read out device coupled with the detector for reading out the pixel data stored in the picture memory at addresses corresponding to the positions of the printing units relative to the sheet; a timing generator coupled with the position generator for generating a plurality of printing timing signals and having a timing selector to select one of the printing timing signals in accordance with the information related to the respective positions …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.