| 摘要 |
An apparatus for monitoring a yarn at a winder which comprises a tribo electrical transducer for determining the presence of a stationary yarn, an interrogation mechanism operably associated with the yarn, and means for actuating the interrogation mechanism when the speed of travel of the yarn has fallen below a predetermined boundary value so that the interrogation mechanism can generate a relative movement between the transducer and the yarn which is sufficient to produce a response signal by the transducer.
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