Phase-locked web position signal using web fiducials
US8847185B2 · kind B2 · utility
4Cited by
59References
10Claims
0Family size
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Key dates
| Filing date | Dec 7, 2009 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Feb 27, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/512
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Approaches for enhancing web position determination involve phase locking a web movement encoder signal to a sensed web fiducial signal. Fiducials disposed along a longitudinal axis of a substrate are sensed and corresponding sensor signals are generated. An estimated web position is provided by one or more encoder signals. The phase difference between the sensor signals and the encoder signals is calculated and the web position error is determined based on the phase difference. The web position error signal can be fed back to adjust the encoder signals which improves the accuracy of the web position determination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.