Ink jet printing apparatus and ejection recovery method for printing head
US7175252B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Jun 14, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/16579
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An example conventional method of avoiding a printing failure caused by residual bubbles in a print head involves counting from an initiation of a printing operation the accumulated number of print dots formed by the entire print head and, when the count value reaches a predetermined value, executing a recovery operation. Such a conventional method, however, requires the recovery operation to be performed frequently by selecting a threshold value for the worst condition. To solve this problem, the nozzles in the long print head are divided into a plurality of blocks, the accumulated number of print dots is counted for each block, the count value multiplied by a weighting value, which is determined according to the position of the block, is compared with a predetermined threshold, and, when at least one of the weighted count values exceeds the predetermined threshold, the recovery operation is executed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.