Device for surveying the insertion of a weft yarn
US4784189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD03D51/34
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A device for surveying the insertion of a weft yarn in a shed of a jet loom, comprises an arrival sensor arranged at one end of said shed for detecting the arrival of weft yarn there. The arrival sensor and at least one yarn sensor are connected to a surveillance circuit measuring the period of time lapsed since releasing a stopping device and periodically correcting the measured period of time on the basis of the yarn sensor signal. The surveillance circuit only generates a signal indicating the completion of the weft yarn insertion if the following two conditions are simultaneously fulfilled: The measured period of time exceeds a predetermined period of time between 80% and 99.5% of the period of time required for a complete weft yarn insertion cycle, and the arrival sensor generates a signal representing the arrival of the weft yarn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.