PROCESS AND APPARATUS FOR CONTROLLING DISTRIBUTION OF THREAD ON A PACKAGE IN A COLLECTION UNIT FOR SYNTHETIC THREADS

摘要

The present invention relates to a process for piloting the distribution of the thread on the package under formation, in a collection unit for collecting synthetic threads, so as to prevent ribbness from forming during the continuous overlapping of different winding layers, so as to render easy and simple the subsequent technologic operations which the thread of the package has to be submitted to. The present invention furthermore relates to an apparatus for the practical implementation of the process, which substantially consists in setting, instant by instant, the values of the operational parameters during the thread winding in such a way that the collection unit operates along descending portions of lines, with each being defined by a constant and non-integer "winding ratio" "K", and in containing said line portions inside a range bounded by a maximum threshold value and a minimum threshold value of the winding angle, with said maximum and minimum threshold values being symmetrical relatively to the value regarded as the optimum one, for the package under formation, and in furthermore piloting the traverse cam in order to fix the dislocation of said descending line portions at a distance higher than, or at least equal to, a prefixed reference value, from a whatever line belonging to the group of "integer-K-value" lines, or of "exact-fraction-K-value" lines, which represent, as a whole, the orders of ribbness caused by the "mirror effects", regarded as detrimental to the winding which is taking place.