{HEAD ~ The cam mechanism} comprises a first cam member and a second cam member, and it converts rotation of {TAIL ~ 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 a first cam member and a second cam member , and it converts rotation of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH