After {HEAD ~ the front edge} of the document sheet touches {TAIL ~ the stopper} 101, the motor 21 is run for an extra period of time sufficient for moving the conveyer belt 10 by about 10 mm 
touches
After { HEAD ~ the front edge } of the document sheet touches { TAIL ~ the stopper } 101 , the motor 21 is run for an extra period of time sufficient for moving the conveyer belt 10 by about 10 mm
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH 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