Continuous form printer
US5779378A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1997 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Apr 8, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/42
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printer includes a tractor unit for feeding continuous form paper, encoders driven in synchronization with a tractor belt, and detecting sensors for detecting rotation of the encoders to generate feed pulses at a standard interval. The printer further includes a paper top sensor which detects a leading edge of the continuous form paper to generate a paper top signal and is arranged to control the feeding of the paper based on a feed pulse generated after the paper top signal. In order to compensate for a delay of the paper top signal, the printer controller is arranged to determine if there is a delay in the paper top signal by comparing the time interval between the paper top signal and the feed pulse with a threshold value. The printer is so arranged that the threshold value is stored in a non-volatile memory and can be set after assembly of the printer. A positioning error of the paper top sensor with respect to the tractor unit due to imprecise mounting of the paper top sensor can be compensated by adjusting the threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.