Abstract: A control apparatus for the electromagnetic brake of a brake device or unit of a weaving machine or loom comprises a cam-controlled brake-pulse transmitter rotating with the machine shaft and two continuous signal switching stages which act upon two parallel connected AND-gates or circuits, each having connected thereafter an adjustable or regulatable time-delay element. The latter jointly cooperate with an OR-gate or circuit which delivers a related stop signal to the brake device or unit. In this way it is possible to achieve a simple, precise and reliable regulation of the angular position of the crank, so that the regulatable time-delay between the output pulse of the AND-gate and the output pulse of the time-delay element constitutes a measure for the corresponding angular position of the crank.

Abstract: A weft or filling thread monitor comprises a wire-shaped feeler pin which is pivoted by a thread, against the action of spring force, in the region of a measuring field. The measuring field encompasses a light-emitting diode and a photocell and enables generating, in a contactless manner by the feeler pin, an electrical control signal which is related to the monitored thread. This control signal is infed to a first input of a gate switching stage, at the second input of which there is applied a machine-controlled reference signal. In the absence of the control signal there appears at the output a work signal suitable for shutdown of the machine. Due to these measures such thread monitoring apparatus, working with contactless signal triggering, can fulfil all of the requirements placed thereon.