Method of and apparatus for detecting weft yarn in jet looms

Details Method of and apparatus for detecting weft yarn in jet looms Method of and apparatus for detecting weft yarn in jet looms

1983-05-24

1984-12-11

Kee Chi, James

Textiles: weaving

Stopping

Weft

340677, D03D 5118

Patent

active

044872356

ABSTRACT:
The amplitude of a signal (original waveform) produced by weft sensors is relativized, and the signal waveform is analyzed in various aspects based on multiple parameters to discriminate a weft yarn and a jet of fluid accurately. More specifically, a discriminating function is calculated beforehand from a signal indicative of the weft yarn and jet of fluid under normal weft insertion conditions, and a signal produced in actual detection operation is compared with the discriminating function to determine whether the weft yarn is present or not. The discriminating function can be obtained by extracting feature parameters from a signal generated by the weft sensors, and relativizing the feature parameters with respect to the original signal waveform to find a reference quantity. The feature parameters include the original waveform per se, a differentiated value thereof, an integrated value thereof, frequencies in certain frequency ranges, and sampling averages of the above parameters. The parameter relativization is carried out by finding ratios and differences between the feature parameters. The discriminating function is created by a statistical method.

REFERENCES:
patent: 3967656 (1976-07-01), Gotoh
patent: 4183381 (1980-01-01), Gotoh
patent: 4188902 (1980-02-01), Kahan
patent: 4270579 (1981-06-01), Nakanishi
patent: 4393903 (1983-07-01), Ida

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