Method and apparatus for detecting periodic yarn irregularities

Details Method and apparatus for detecting periodic yarn irregularities Method and apparatus for detecting periodic yarn irregularities

1977-01-19

1977-11-22

Queisser, Richard C.

Textiles: spinning, twisting, and twining

Apparatus and processes

Web material

28227, 57156, 73160, D01H 1322

Patent

active

040589625

ABSTRACT:
A measuring head is used to measure a yarn characteristic while generating a continuous signal proportional to variations in the measured characteristic. The signal is multiplied by an identical second signal obtained either from a second measuring head located downstream of the first measuring head a distance corresponding to a predetermined periodic interval of yarn length (L) or by a time-delay of the first signal corresponding to the periodic interval (L). The multiplication of the signal deviations occurring at the periodic intervals, should such be present, produces a strong output signal indicative of the yarn irregularities. This output signal can be used to interrupt operation of the yarn processing machinery.

REFERENCES:
patent: 2641960 (1953-06-01), Strother
patent: 3069621 (1962-12-01), Buthcaz et al.
patent: 3303698 (1967-02-01), Loepfe
patent: 4007457 (1977-02-01), Aeppli

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