Method and relative device for intermittently storing and returning yarn during the winding of conical bobbins fed with yarn at constant speed.

摘要

A device and method for winding conical bobbins with yarn withdrawn at constant speed from individual spinning units, and comprising: a deflecting roller (5) or similar element, which is connected to and moved backwards and forwards by a swinging flat element (4) for yarn storage and accumulation, to compensate the variation in the speed at which the yarn is collected on the conical surface of the bobbin (24) under formation; an electronic or similar yarn tension measurer (7) of known type for measuring the tension values of the yarn being wound and to generate electrical signals proportional to said values; an electrical comparator (8) for comparing said electrical signals with one or more reference signals to generate a control signal when an electrical signal arises which indicates a non-regular yarn tension; an electronic control unit (8) for converting said control signal into a signal which varies the amplitude of the swing motion of a drive source; a drive source (9) which increases or decreases the amplitude of its intermittent drive motion in order to adjust the swing movement of the storage arm (4) to an amplitude which is slightly greater or slightly less than the previous value in order to rapidly restore the yarn tension to within the range of values corresponding to regular tension.