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