Compact speed reduction mechanism for a uhf indicator dial

Details Compact speed reduction mechanism for a uhf indicator dial Compact speed reduction mechanism for a uhf indicator dial

F - Mech Eng,Light,Heat,Weapons

16

H

365/19

F16H 35/18 (2006.01) H03J 1/02 (2006.01) H03J 1/04 (2006.01)

Patent

CA 1050180

A COMPACT SPEED REDUCTION MECHANISM FOR A UHF INDICATOR DIAL Abstract of the Disclosure A compact speed reduction mechanism for driving a tuning indicator dial of a UHF television tuner or the like includes a harmonic drive unit having a rigid fixed spline and a movable flexible spline member. The indicator dial is mechanically coupled to the flexible spline member and a wave generator is attached to the selector shaft. The number of teeth on each spline is selected to give approxi- mately a seven-to-one reduction ratio between the selector shaft and the indicator dial. More teeth are provided on the flexible spline than the rigid spline to prevent binding between the splines which normally occurs when reduction ratios of less than approximately twenty-to-one are used.

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