Philips Electronics N.a. Corporation

Richard R Wright

Christopher J Ryan

A cable drive apparatus is presented which has minimal cable slippage and backlash. Such a cable drive is particularly well suited for systems requiring accurate positioning and repositioning capabilities, such as motorized camera orientation systems. To achieve minimal slippage on a cable driven pulley, one or more positioning balls are located at fixed locations on the cable, and corresponding positioning holes are located on either pulley. Tensioning means are also provided to remove slack, to minimize the backlash which may result from the stretching of the cable over time. A two pulley system is presented wherein the cable is fixedly attached to one pulley, travels over the other pulley which has the slippage constraining positioning holes, and then to tensioning means which also fixedly attached to the first pulley.

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Reinholds, PA, United States of America

Richard R Wright