Abstract: 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.

Abstract: A circuit for detecting disturbances in yarn travel at a textile machine, comprising a probe delivering an electrical signal in the presence of such disturbances, the probe being operatively coupled by means of discriminator stages with a pre-selection counter structured for setting the maximum permissable number of disturbances. The pre-selection counter is operatively coupled with a multivibrator which, upon exceeding the aforesaid number, delivers a disturbance signal. A clock generator is coupled with one input of the multivibrator which is constructed as a bistable multivibrator or flip-flop and additionally is connected by means of a delay element with a resetting input of the pre-selection counter.

Abstract: Apparatus for textile fiber band or the like composed of staple fibers, wherein the fiber band is guided through a transport tube or duct and there is produced within the transport duct an air flow directed in the same sense as the feed or conveying direction of the fiber band.

Abstract: A monitoring apparatus for a textile machine comprising a feeler coupled with an evaluation circuit, the feeler possessing two spaced electrodes, each of which delivers an electrode signal when textile material moves therepast. The electrodes are offset in the direction of movement of the textile material and the evaluation circuit comprises a logic circuit responsive to electrode signals having a time displacement corresponding at least approximately to the transit time of the textile material from the one electrode to the other electrode.