The cranks confine {HEAD ~ the motion} of {TAIL ~ each} of the transmission rings to a non rotary, planetary motion 
The cranks confine { HEAD ~ the motion } of { TAIL ~ each } of the transmission rings to a non rotary , planetary motion
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH