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