{HEAD ~ A control cam} is formed on {TAIL ~ a first transmission linkage} and a feeler roller is rotatably mounted on a second transmission linkage 
is formed on
{ HEAD ~ A control cam } is formed on { TAIL ~ a first transmission linkage } and a feeler roller is rotatably mounted on a second transmission linkage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH