Apparatus and methods for compensation of thermal and hydroscopic expansion effects in a low cost motion control system
US8182065B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Aug 5, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J19/202
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Disclosed are apparatus and methods for compensating for the change in length of an encoder strip due to environmental effects such as temperature and humidity. The apparatus and methods utilize two simple optical sensors spaced apart and mounted on a substrate having a different coefficient of thermal expansion than the encoder strip; the substrate is mounted to the movable component which is to be positioned, such as a printer carriage. Embodiments of the methods utilize information from the two sensors, in conjunction with information from the analog encoder used to position movable component, to compensate for environmental effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.