Cam surfaces on {HEAD ~ the advancing elements}, which engage cam surfaces on adjacent members in conjunction with a pair of pneumatic cylinders which apply {TAIL ~ a reciprocating motion} thereto, provide the movement of these advancing elements 
Cam surfaces on { HEAD ~ the advancing elements } , which engage cam surfaces on adjacent members in conjunction with a pair of pneumatic cylinders which apply { TAIL ~ a reciprocating motion } thereto , provide the movement of these advancing elements
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH