Non-contact sheet sensing system and related method
US6588118B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 10, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Oct 10, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contact system for sensing a property of a passing web of material includes first and second sensors positioned on opposite sides of the web. The opposing sensors are repelled from the web and each other by gas bearings formed between the sensors and the web and attracted to each other by one or more polarized magnets embedded in the sensors. The resultant net force properly spaces the sensors from the web to ensure reliable and accurate sensing. The repelling force enables the sensors to react substantially instantaneously to changes in the pass line of the web. An automatic actuator/retractor can be provided to withdraw the sensors, extend the sensors to or retract the sensors from adjacent the feed path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.