{HEAD ~ The cam mechanism} comprises {TAIL ~ a first cam member} and a second cam member, and it converts rotation of the first cam member about an axis of rotation into a first straight line motion of the second cam member 
{ HEAD ~ The cam mechanism } comprises { TAIL ~ a first cam member } and a second cam member , and it converts rotation of the first cam member about an axis of rotation into a first straight line motion of the second cam member
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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