| 摘要 |
A plurality of core mounting outer ring members are each rotationally slidably mounted on a corresponding inner ring member having cam surfaces in the outer surface. A rotating drive shaft has radial pistons and rotates the inner ring member by frictional engagement of the pistons displaced by an inflatable bladder. A pluraltiy of strips in one embodiment are between the bladder and teh pistons for providing increased torque on the inner ring member. The outer ring member has a first annular array of bores with core gripping balls resiliently urged radially outwardly to grip a core receiving a winding strip thereabout. A second array of bores in the outer member receive larger core gripping balls which freely displace in the bores. Ramp camming grooves are in the outer surface of the inner ring member, the larger gripping balls are engaged with the grooves and are forced into gripping engagement with the received core when the inner ring member is rotated. The spring loaded balls provide initial friction load between the core and outer ring members so that the ramp balls can operate to grip the core upon rotation of the inner ring member.
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