Weft sensor for a loom

Details Weft sensor for a loom Weft sensor for a loom

1982-12-06

1985-10-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

1393702, 250571, D03D 5134

Patent

active

045462631

ABSTRACT:
A weft sensor for a loom which can detect the presence or absence of a weft inserted into a warp shed at an acceptable moderate sensitivity on the basis of the majority decision of weft detection signals. When sensor sensitivity is too high, the weft sensor erroneously detects the fluff attached to the sensor as the presence of a weft, thus keeping the loom operated continuously. This erroneous detection reduces the quality of woven cloth. On the other hand, when sensor sensitivity is too low, the weft sensor erroneously detects a slender weft as the absence of a weft, thus keeping the loom stopped unnecessarily. This erroneous detection reduces the duty cycle of the loom. The weft sensor according to the present invention comprises a plurality of weft detectors and a majority decision circuit made up of a plurality of logical circuit elements such as AND, OR, NAND gates, etc.

REFERENCES:
patent: 3853408 (1974-12-01), Kaalverink
patent: 4178969 (1979-12-01), Gotoh et al.
patent: 4248272 (1981-02-01), Wilson et al.
patent: 4384596 (1983-05-01), Brouwer et al.

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