Self-adjusting controller for dot impact printer
US5439302A · kind A · utility
12Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Dec 13, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/28
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A controller for a dot impact printer has capacitance sensors for sensing the motion of the dot wires in the print head, and a non-volatile, rewritable memory for storing self-adjustment data relating to dot-wire characteristics. A processor controls the driving of the dot wires according to the self-adjustment data stored in the memory. At certain times, the processor causes the dot wires to be driven in a test sequence and updates the self-adjustment data in the memory according to the resulting sensor output. Print quality is thereby maintained for the full guaranteed life of the print head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.