| 摘要 |
An improved medium clamp mechanism in a drive mechanism is disclosed which assures good centering and clamping of a medium such as a floppy disk and a video disk. The mechanism includes a pulley having a substantially U-shaped cross section, a hub frame and a hub having a cylindrical portion and a contiguous flanged portion and cooperating with the pulley to clamp a medium therebetween. The pulley has an inner diameter rather smaller than the diameter of a center clamp hole of the medium and has a tapered portion provided on the inner periphery adjacent the top thereof. Meanwhile, the outer diameter of the cylindrical portion adjacent the flanged portion of the hub is rather larger than the diameter of the clamp hole of the medium and another tapered portion is provided there such that a spacing is formed between the tapered portions of the hub and of the pulley.
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