This particular attitude of small roller 50 assists in tending to lift and maintain the side edge portion 21a in the bight of {HEAD ~ the U} shaped {TAIL ~ guide bar} 48, keeping the sheet material from migrating downwardly and out of the guide bar 
This particular attitude of small roller 50 assists in tending to lift and maintain the side edge portion 21a in the bight of { HEAD ~ the U } shaped { TAIL ~ guide bar } 48 , keeping the sheet material from migrating downwardly and out of the guide bar
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH