Device for surveying the insertion of a weft yarn

Details Device for surveying the insertion of a weft yarn Device for surveying the insertion of a weft yarn

1988-02-29

1988-11-15

Jaudon, Henry S.

Textiles: weaving

Stopping

Weft

139452, D03D 4734

Patent

active

047841893

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.

REFERENCES:
patent: 4541462 (1985-09-01), Tholander
patent: 4556088 (1985-12-01), Tanaka et al.
patent: 4558723 (1985-12-01), Tanaka et al.
patent: 4595039 (1986-06-01), Tholander
patent: 4607668 (1986-08-01), Tholander
patent: 4617971 (1986-10-01), Hellstroem
patent: 4627474 (1986-12-01), Tholander

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