Eccentricity compensation in a web handling system
US6831801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Mar 1, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/1883
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A control system compensates for web tension variation caused by a first spool, (A) determines rotational frequency of the first spool; (B) determines variation in rotational velocity at the second spool which occurs at the (A) first spool frequency; (C) determines the rotational position at the first spool corresponding to the (B) variation in rotational velocity at the second spool; (D) calculates a drive motor profile for the first spool which tends to cancel the (B) variation in rotational velocity at the second spool; and (E) superimposes the (D) drive motor profile on a first spool drive motor at the (C) determined rotational position of the first spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.