| 摘要 |
A motorized yarn-winding drum (D, D') holds a plurality of loops of yarn (F) wound thereon and is driven to rotate for drawing said yarn (F) from a reel (R) and feeding it to a general downstream machine (M). A movable guiding member (26, 126) is biased to slidably engage the yarn (F) unwinding from the drum (D, D') and to deviate its path, by a spring (24, 124) acting in contrast to the tension of the yarn (F), thereby generating a reserve releasable in response to tension peaks on the yam. The stroke of the guiding member (26, 126) is limited by a stop (30, 130) defining a position of maximum deviation of the yarn (F). The spring (24, 124) has one end operatively connected to the guiding member (26, 126) and one opposite end connected to driving means (36, 136) operable for applying a load to the spring (24, 124), with the guiding member (26, 126) abutting against said stop (30, 130). The driving means (36, 136) are controlled by a control unit (CPU) which is programmed to adjust the load as a function of a desired feeding tension.
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