| 摘要 |
A rotary holding device includes a drive axle disposed within a housing, a worm gear supported by the drive axle and having a helical thread, a driven axle disposed within the housing and perpendicular to the drive axle, a rotary holder carried by the driven axle, and first and second drive discs mounted coaxially on the driven axle respectively at two opposite sides of the worm gear. Each of the first and second drive discs has an inner face provided with a plurality of axially projecting and angularly spaced-apart rollers that mesh with the helical thread of the worm gear.
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