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 {HEAD ~ rollers} for meshing {TAIL ~ engagement} with the teeth 
for meshing
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 { HEAD ~ rollers } for meshing { TAIL ~ engagement } with 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 HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH