Importance

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Abstract

In order to control a digital sensor S, which by means of a sensor element H responds at least to a variation of a magnetic field M and emits different output signals Y, which are sampled or detected at predetermined points in time t1, t2, t3, the analogue response signal W of the sensor element H being converted by means of a digitising hysteresis switching device T into the output signals Y, the sensor S is switched off and on again at least before the respective output signal Y is detected. The sensor S comprises a clocked interrupter U for switching the sensor S on and off alternately, the clock frequency of the sensor being adapted to the detecting frequency such that the output signal Y can only be detected if the sensor S is switched on before detection. The sensor constitutes a yarn sensor in a yarn feeder F, which comprises a permanent magnet P in a stationary storage drum 13, which permanent magnet P can be moved by the yarn G, and the yarn sensor output signals being converted into control signals for a yarn winding on drive 12 (FIG. 1).

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First Claim