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