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