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