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