Apparatus for monitoring yarn travel at a multiple spindle spinning machine

摘要

An apparatus for monitoring yarn travel at a multiple spindle spinning machine which is equipped with a suction device servicing at least one group of the spindles. In a collecting channel of the suction device there is arranged a probe which upon passage therepast of fiber flocks or the like delivers an electrical signal to an evaluation circuit equipped with a periodically resettable signal counter having pre-settable counter value and an alarm device. The alarm device can be switched-in by means of a further cumulative counter with a higher, pre-set counter value. This further cumulative counter is coupled by means of a logic circuit with the periodically resettable signal counter in such a manner that the cumulative counter is reset whenever there is missing once or twice a signal from the periodically resettable signal counter.