| 摘要 |
An improved assembly for alternating twist in yarn, utilizing a pair of air jets in which compressed air is supplied producing a vortex that causes the yarn passing therethrough to experience a torque about the yarn's longitudinal axis. This apparatus is used to provide an alternating twist to fill yarn as the yarn is being fed into the loom. The twisting unit operates by imparting "s" twist for a certain period of time while the yarn is in linear motion, followed by imparting a "z" twist for another certain period of time, in repeating fashion. The net twist in the yarn so treated is zero. Preferably, the twisting of the fill yarn is coordinated with the loom so that the twist direction is reversed prior to each successive filling insertion. This method produces a woven product that contains no yarn regions having an area of zero twist commonly found in weaves produced by alternate twist yarn, because the twist reversal occurs during a time when no filling is being inserted, and occurs spatially outside of the boundaries of the woven cloth. |
