Sensor to measure the rotary speed of an open-end spinning rotor, without contact, is within a housing in a telescopic array for setting at the end surface of the rotor support disk fitted with a permanent magnet

摘要

To measure the rotary speed of a rotor without contact, at an open-end spinner, at least one permanent magnet (37) is at a rotor shaft support disk (4) to generate magnetic field lines. A sensor (39) is shrouded within an electrically conductive and earthed housing (48) of a non-ferrous material. The sensor to measure the rotary speed of an open-end spinning rotor is within a sleeve housing of brass, which can be telescopic to set the sensor at the disk surface. The telescopic action is controlled by a setting unit (44) with a return spring (47). The sensor has an induction coil, with a ferromagnetic core to bridge the gap between the induction coil and the end side (36) of the rotor support disk. The return spring, at the sensor housing setting unit, is an electrically conductive signal transfer unit for the signals from the sensor, insulated against the housing during signal transfer. When the sensor is retracted, into the inoperative setting, the housing is short circuited with the return spring.