A variable gear assembly has {TAIL ~ a cam gear} with {HEAD ~ a plurality} of teeth of varying size and configuration, and a rotatably mounted roller gear has a plurality of rollers for meshing engagement with the teeth 
A variable gear assembly has { TAIL ~ a cam gear } with { HEAD ~ a plurality } of teeth of varying size and configuration , and a rotatably mounted roller gear has a plurality of rollers for meshing engagement with the teeth
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH