| 摘要 |
Apparatus for mechanically converting the movement of a driven member into usable mechanical output signals without imposing any significant loading on the driven member. The driven member is modified as necessary to permit it to roll a lightweight bearing element between a pair of apertures and the bearing element will pass through the second of said apertures and be picked up by a power drive unit which includes means for sensing the presence of the bearing element as it is driven back to the vicinity of the first aperture through which it is returned so as to again be intercepted by the driven member.
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