An upper ramp is disposed upstream from {HEAD ~ the accumulation section} and is movable into and out of {TAIL ~ the sheet feed plane} 
An upper ramp is disposed upstream from { HEAD ~ the accumulation section } and is movable into and out of { TAIL ~ the sheet feed plane }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL