| 摘要 |
Improvements to procedures for the splicing of yarns (20-21), whether textile or not, the splice being obtained by coupling two single untwisted yarns (20-21) and re-imparting the twists thereafter, in which improvements a part of the single yarns is untwisted until twists of a sign opposite to the original sign have been imparted, and such part is then coupled and small tails (220-221) are obtained, and the coupled segment is then retwisted by imparting a desired twist, such small tails (220-221) being obtained after a substantial parallelization of the fibres to be plucked and/or torn (42) and after a successive plucking and/or tearing action (40) along the axis of the yarns, the tapering (320-321) of such tails (220-221) reaching the neighborhood of the periphery of the retwisting rings (28), the resulting tails (220-221) being controlled and positioned alongside the yarns (21-20) before the beginning of such action to impart such desired retwisting, at least part of the segment of yarn being untwisted undergoing a drawing action at least during the untwisting step and at least at about the transient stage of conversion from one type of twist to the other (from "Z" to "S" or from "S" to "Z"). |
