Patent ID: 6708731
Filing Date: 2004-03-23
Classification: D03D

Abstract:
Method of monitoring weft yarn run/stop conditions during the insertion cycles of a shuttle-less weaving machine like a rapier or projectile weaving machine (M) by means of a weft yarn actuated electronic weft yarn feeler (W, S) operating with a working sensitivity level (Hi) for generating run output signals, said weft yarn feeler (W, S) comprising electronic means to adjust said working sensitivity level, characterised in that the present working sensitivity level (Hi) as effectively used for confirming run/stop weft yarn conditions continuously and automatically is adjusted during operation of said weaving machine to oscillate about an optimum and safe working sensitivity level by observing within a predetermined restricted observation interval (X) of each insertion cycle the signal stability of the run output signal under consideration of an observation sensitivity level (Lo) lower than the respective present working sensitivity level (Hi), and by lowering or raising the present working and observation sensitivity levels in dependence from the observed signal stability.