Process and device for measuring the twist of a running, elongate test body
US5030841A · kind A · utility
10Cited by
1References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Feb 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test body is illuminated by at least one light source obliquely to its direction of travel, and the reflected light is imaged onto a diaphragm and fed to a photoelectric receiver. Its signal is investigated, in an evaluating unit, for periodicties which are caused by irregularities included in the test body as a result of the twist and the wavelength of which represents a measure of the twist. A rapid and precise measurement of the twist of yarns is made possible thereby.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.