| 主权项 |
1. A motion control system for precise and repeatable rotation of an external device, comprising:
a gearset, having;
a rotatable driven gear having driven gear teeth around an outside diameter, a central axis about which said driven gear may rotate, said driven gear teeth affixed to said gear;a rotatable cam, having an inside diameter surface with a first axis, an outside diameter surface with a second axis, said outside and said inside diameter defining a cam sidewall, said driven gear being rotatably held within said inside diameter surface of said rotatable cam and concentrically rotatable with respect to said inside diameter surface, said first axis coaxial with said central axis of said gear, said first axis eccentrically offset from said second axis, said rotatable cam having a first end face and a second end face, said inside diameter surface terminating at said first and second end faces, said outside diameter surface terminating at said first and second end faces, said first end face being separated from said second end face by a first distance; a case, having an upper surface and a lower surface, said upper surface being separated from said lower surface by a second distance;
a gearset bore extending from said upper surface to said lower surface with a central axis, said gearset bore rotatably containing said outside diameter surface of said cam so that said cam may rotate with respect to said case along its second axis, a portion of said came sidewall located between said driven gear teeth and said gearset bore;a driving gear, said driving gear having a central axis and gear teeth adapted to interface said driven gear teeth, said driving gear being rotatable with respect to said case about its central axis, and said driving gear fixed from lateral movement with respect to said case, whereby rotating said cam with respect to said case shifts a relative distance between said central axis of said driving gear and said central axis of said gearset bore. |
