Patent ID: 7867122

Claim:
A method for maintaining the rotational speed of an output component in a rotationally driven system within a desired range, said method comprising: rotating a first input component; rotating a drive mechanism in response to rotating said first input component, wherein said drive mechanism comprises: a plurality of components moving eccentrically, said eccentrically moving components rotating about the axis of rotation of said first input component; and two stages, said first stage comprising a first portion of said moving components rotating at a first reduced speed in response to either rotation of said first input component or said second input component; and said second stage comprising a second portion of said moving components rotating at a second reduced speed in response to rotation of said first portion; rotating said output component in response to rotating said drive mechanism; and further rotating said drive mechanism in response to rotating a second input component wherein rotating said second input component is responsive to changes in rotational speed of said output component from said desired range.