A lower ramp is disposed below the upper ramp and is movable into and out of {HEAD ~ the sheet feed plane} in alternating relation to {TAIL ~ the upper ramp} 
A lower ramp is disposed below the upper ramp and is movable into and out of { HEAD ~ the sheet feed plane } in alternating relation to { TAIL ~ the upper ramp }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL