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