{HEAD ~ A reciprocable drive mechanism} supporting the hammer bank is mounted to undergo {TAIL ~ free flight} with low friction along a selected axis parallel to a printing line 
is mounted to undergo
{ HEAD ~ A reciprocable drive mechanism } supporting the hammer bank is mounted to undergo { TAIL ~ free flight } with low friction along a selected axis parallel to a printing line
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH