Device for scanning a yarn with a light beam
US7333203B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 2003 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Jul 28, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8845
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a device for scanning a thread, which is displaceable in the longitudinal direction thereof inside a measuring slot, by means of an optical beam emitted by a light source. The device includes a receiver of light reflected on the thread and a unit for processing electrical signals received by the receiver. The aim of the invention is to develop a small-sized device which is easy to operate and which makes it possible to detect foreign matter contained in the thread in a most selective manner at a high sensitivity. For this purpose, the light emission in at least two wavelength ranges is carried out by means of a light source, with these wavelength ranges being determined by two main wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.