CONTINUOUS MEASUREMENT OF YARN TWIST

摘要

PCT No. PCT/AU83/00109 Sec. 371 Date Apr. 12, 1984 Sec. 102(e) Date Apr. 12, 1984 PCT Filed Aug. 12, 1983 PCT Pub. No. WO84/00781 PCT Pub. Date Mar. 1, 1984.A method and apparatus for non-destructively measuring twist in a translating yarn (2) by means of a blade (1) which is in rubbing contact with the translating yarn (2) so that vibrations are imparted to the blade (1). The frequency of vibration of the blade (1) provides a measure of the twist imparted to the yarn (2) so that the signal frequency can be used as a measurement of the twist in a yarn (2) under test or as a feedback signal controlling the rate of twist imparted by a twist insertion station(8) during the formation of a yarn.