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