With this arrangement, {HEAD ~ the opposite side edge portions} of {TAIL ~ the sheet} can be driven independently either in a forward or in a rearward direction 
of
With this arrangement , { HEAD ~ the opposite side edge portions } of { TAIL ~ the sheet } can be driven independently either in a forward or in a rearward direction
OTH OTH OTH OTH HEAD HEAD HEAD 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