Method and device for limiting a number of times each print hammer is driven during a predetermined period of time
US5826990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1997 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Sep 19, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J9/26
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
To prevent effective print speed from being lowered, a counter is provided for each of a plurality of print hammers. A number of times a print hammer is driven during one print phase having a predetermined period of time is counted by the counter. The counted value is compared with a reference value, and when the counted value has reached the reference value during the print phase, driving of the print hammer is halted until the end of the print phase. A reference value is changed based on the number of times the print hammer is driven during a previous print phase immediately before the present print phase. The reference value represents an allowable number the print hammer can be driven during each of successive print phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.