Introduction of Automatic Constant Tension (ACT) Bobbin Hanger
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¡¡¡¡Automatic constant tension (ACT) bobbin hanger is designed and developed by our factory under a large analysis of structures of bobbin hangers from both at home and abroad. And also we made in-depth investigation from problems in using bobbin hanger in domestic spinning mills. By years' of research, we developed out this ACT bobbin hanger. Thus we solved the problems of unstable tension, unexpected prolonged and suspended roving yarns during unwinding, which would cause yarn defects, hard heads and yarn breakages, etc.

¡¡¡¡ACT bobbin hanger changes its original structure mode, the constant tension structure (internal) is comprised of damping spring, force spring, and steel ball bowl. Its working principle is the turning friction of bobbin hanger changes with the weight of roving. The stable tension of roving from heavier to lighter during unwinding is ensured by controlling the damping value of friction which is completed by elastic ratio of damping spring, force spring and friction ratio of damping cap.

¡¡¡¡Specific working principle descriptions: when bobbin hanger with full roving, its gravity is maximum, at this time the force spring is under maximum pressure, leading damping cover moves down, at this same time the compressed damping spring would be released and elongated, and the pressure of damping spring on damping cover would be reduced (maximum designed pressure at ex-works), so the friction is minimum, full roving tension is fixed. As roving becoming smaller and smaller, gravity on bobbin hanger would also become smaller and smaller, and unwinding speed would become faster. At this time the force spring gradually releases and elongates, and the damping spring is gradually compressed and elasticity is strengthening. Pressure on damping cover is also gradually becoming bigger, friction is also becoming bigger, but the combined forces of gravity and friction on roving do not change. The roving tension keeps same as before. That is this ACT bobbin hanger could keep the roving tension stable by automatically adjusting unwinding friction ensuring the roving tension remain unchanged, making unwinding speed stable. Thus to avoid the roving speed unstable, which would cause intermittently stops and appears roving suspended, yarn defects, hard heads, and breakages, etc. So, the problems, which had suffered spinning mills for so many years, have been solved from now on.

 
 
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