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