Method and apparatus for detecting periodic yarn irregularities in a yarn between a yarn forming stage and a yarn winding stage
US4058962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1977 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Jan 19, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/365
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring head is used to measure a yarn characteristic while generating a continuous signal proportional to variations in the measured characteristic. The signal is multiplied by an identical second signal obtained either from a second measuring head located downstream of the first measuring head a distance corresponding to a predetermined periodic interval of yarn length (L) or by a time-delay of the first signal corresponding to the periodic interval (L). The multiplication of the signal deviations occurring at the periodic intervals, should such be present, produces a strong output signal indicative of the yarn irregularities. This output signal can be used to interrupt operation of the yarn processing machinery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.