Abstract: The present invention relates to a thread-laying device with several rotating thread-guide elements, producing an alternating to-and-fro movement of synthetic or natural threads, supplied at high speed, in which the said device has its rotating thread-guide elements arranged in two groups which work together to wind the thread crisscrossed, and each group is positioned on an inclined plane in relation to the plane normal to the direction of downward movement of the thread and the said inclined planes converge in a vertex close to the said thread. The inclinations of the two said planes in relation to the normal plane have values which differ greatly from each other and the angle of their vertex has an essentially consistent value.

Abstract: The present invention relates to a process for piloting the distribution of thread on a package under formation, in a collection unit for collecting synthetic threads, to prevent ribboning from forming during the continuous overlapping of different winding layers. The present invention further relates to an apparatus to implement the above process. The process comprises setting, instant by instant, values of operational parameters during the thread winding in such a way that the collection unit operates along descending portions of lines. Each line is defined by a constant and non-integer "winding ratio" "K". The line portions are contained inside a range bounded by a maximum threshold value and a minimum threshold value of the winding angle. The maximum and minimum threshold values are symmetrical to the optimum value. The process further relates to piloting a traverse cam to fix any dislocation of the descending line portions at a distance higher than, or at least equal to, a prefixed reference value.