| 摘要 |
<p>A method and apparatus for twisting two or more strands of yarn together in accordance with a pre-selected and changeable pattern so as to obtain twisted yarn with a selected twist level extending for a selected length of the yarn and other selected twist levels extending for various other lengths of the yarn so that a package of finished yarn has a variable twist pattern which is reproducible and changeable. The yarn twisting apparatus has a drive (60, 46 or 160, 146 or 260, 246, 244) for rotating a finished package (12 or 112 or 212) of twisted yarn, a yarn twister (22, 24, 38 or 122, 124, 138, 139 or 224, 238, 239) for twisting the yarn together, and a drive (52, 152, 252) for the yarn twister. Each drive includes a motor (52, 60 or 152, 160 or 252, 260) which may be a servo motor or a controllable a.c. motor so that the product package drive and the yarn twisting drive may be controlled to selected speed ratios, and also includes a programmable controller (64 or 164 or 264) for controlling this ratio and for varying the time that each selected ratio is maintained.</p> |
