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