| 摘要 |
A rotatable drum has a restraining ring slipped thereover. It is held in position towards the bottom end of the drum by magnets located inside the drum, the restraining ring being either of magnetic material or plastic, incorporating magnetic material; the magnetic force holds the ring floatingly. The ring is flexible and, in one embodiment, can just be slipped over a restraining bulge formed on the drum. During operation, the ring slightly deforms into elliptical shape to permit thread to pass therebeneath and over the bulge. Rotation of the drum is controlled pneumatically by intermittently engaging the drum with a continuously rotating drive, for example from the main drive of the machine (which may be a circular knitting machine) or, over clutches, with individual motors in the drums.
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