{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 into
{ 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 REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH