Automatic adjusting device for adjusting platen gap
US5772339A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1997 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Jun 6, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J25/308
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An automatic adjusting device for accurately adjusting a platen gap including an encoder 14 for outputting pulse signals in accordance with a moving distance of a carriage, a pulse width detector for detecting a pulse width of the pulse signal when the carriage is moved from a reference position in a direction of the platen, a difference calculator for calculating a difference between a pulse width of the pulse signal sent from the pulse width detector and a pulse width of a stored pulse signal, a contact detector for judging a contact position of the recording head with the platen surface by comparing the difference with the reference value, and a controller for controlling a platen gap in accordance with the thickness of a recording medium charged on the platen detected by a pulse signal sent from the encoder and a signal sent from the contact detector. A change in the pulse width caused by resistance on the carriage is subtracted by the difference detector to obtain correction data so that the contact point can be accurately detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.