Each of the crankpins 224 will describe a separate circle, and the center of the ring 215 which coincides with {HEAD ~ the center} of the eccentric disc 213 travels in a circular path about {TAIL ~ the axis} of the shaft 211 
Each of the crankpins 224 will describe a separate circle , and the center of the ring 215 which coincides with { HEAD ~ the center } of the eccentric disc 213 travels in a circular path about { TAIL ~ the axis } of the shaft 211
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 HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH