Method and apparatus of monitoring the quality of a false twist textured yarn
US5440870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1992 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Jan 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/365
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring the quality of the yarn processed on a false twist texturing machine is disclosed, and which includes sensing the tension of the advancing yarn at a location immediately downstream of the false twist unit, and determining the coefficient of variation of the sensed tension. An error signal is generated whenever the coefficient of variation exceeds a predetermined upper limit and whenever the coefficient of variation drops below a predetermined lower limit. Also, an alarm signal is generated whenever the error signal exceeds the predetermined upper limit for a predetermined time, and whenever the error signal drops below the predetermined lower limit for a predetermined time, and the alarm signals are counted so as to provide an indication of the quality of the yarn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.