| 摘要 |
<p>A pull-off aid (9) for threads drawn overhead from upper and lower bobbins (4,3) comprises a disc of adjustable diameter, the disc periphery engaged by the thread from the lower bobbin (3) being formed by overlapping petal-like segments (10) radially displaceably guided between a lower support disc (11) and an upper carrier disc (12). The inner edges of the segments engage a cam (21) fixed to a bobbin carrier (2). The adjustable diameter disc (9) is received on the lower bobbin core which rests on a centering sleeve (6). The latter is supported by a spring (5) so that as the bobbins become smaller, and therefore lighter, the adjustable diameter disc (9) is lifted by the spring (5) so that the inner edges of the segments ride up the cam (21) and are gradually retracted by a garter spring or rubber ring (18). The diameter of the disc (9) is thereby gradually reduced as the diameter of the bobbins becomes smaller.</p> |
