Process and device for measuring the twist of a textile yarn
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Oct 15, 1991
filing date -
Feb 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention concerns a process and a device for optically measuring the twist of a textile yarn. The device comprises means (20) for lighting up the yarn (10) by a beam of light (11) to form a spot of light (12) which corresponds to the light diffracted by the surface fibres of the compact core of this yarn. The energy repartition of this spot is then analyzed by means such as a rotary analyzer (27) to define the angle of twist by determination of the maximum of energy in the said spot (12).
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