{HEAD ~ Roller} 60 is movable along {TAIL ~ a surface} 62 of the front section 11b of the fixed frame 11 
is movable along
{ HEAD ~ Roller } 60 is movable along { TAIL ~ a surface } 62 of the front section 11b of the fixed frame 11
HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH