Method and apparatus for detecting yarn tension and method for w

Details Method and apparatus for detecting yarn tension and method for w Method and apparatus for detecting yarn tension and method for w

1998-03-02

1999-12-07

Mansen, Michael R.

Winding, tensioning, or guiding

Tension control or brake

Take-up coil drive control

73160, 2424135, 242485, B65H 5938, B65H 7700

Patent

active

059969253

ABSTRACT:
An apparatus, for measuring a yarn tension, capable of preventing a filament breakage or loop from being generated while eliminating the necessity of adjustment and keeping a desired precision of measurement. The apparatus is constructed by an unit 1 for an application of a vibration to a yarn being moved, an unit 2 for measuring an apparent transverse wave propagation velocity of the yarn, and a unit 3 for calculating a true transverse wave propagation velocity based on the yarn speed and the calculated apparent transverse wave propagation velocity of the yarn. A control of a winding of the yarn in accordance with a propagation velocity of the transverse wave is also disclosed.

REFERENCES:
patent: 3931938 (1976-01-01), Hasegawa et al.
patent: 4169565 (1979-10-01), Blok et al.
patent: 4393725 (1983-07-01), Satterfield
patent: 4441367 (1984-04-01), Daws et al.
patent: 4572243 (1986-02-01), Felix
patent: 5056734 (1991-10-01), Uchida et al.
patent: 5141169 (1992-08-01), Sugioka
patent: 5710432 (1998-01-01), Bell

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