Real-time determination of web tension and control using position sensors
US6985789B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2003 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Dec 22, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/1888
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Web tension in web material passing through a web transport system is determined in real time using position sensors coupled to driven rollers that define a beginning and an end of a tension zone. The position sensors on the rollers provide information related to the amount of strained web material that has been added and subtracted from the web material present in the tension zone. The amount of web material added to, subtracted from and present in the tension zone in a sample time period is then converted to an unstrained amount of web material that when combined provides an estimate for the present amount of unstrained web material present in the tension zone. Because the length of the tension zone is both fixed and known, the tension in the web material is determined from the present amount of unstrained web material in the tension zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.