Continuous measurement of yarn twist
AssigneeUnisearch Limited
InventorsJae L. Woo, Boshra D. Farah
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Abstract
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.
Claims10
A method of measuring twist in a translating yarn comprising sensing the frequency of vibration of a fixed blade having an edge in contact with the translating yarn and calculating the twist of the yarn which is a function of the frequency of vibration of said blade.
Apparatus for measuring twist in a translating yarn comprising a fixed blade adapted to have an edge in contact with a translating yarn, means for sensing the vibration imparted to said blade by the translation of said yarn across said edge, and means for measuring the frequency of said vibration.
An automatic control system for a twist insertion apparatus comprising:
- a fixed blade adapted to have an edge in contact with a translating yarn;
- means for sensing the vibration imparted to said blade by the translation of said yarn across said edge;
- means for measuring the frequency of said vibration;
- and, means for providing a feedback signal controlling the twist insertion rate applied to input fibre material at a twist insertion station.
Dependencies are inferred from the claim text.