Sensors are provided so that {TAIL ~ the rotational position} of {HEAD ~ each worm gear} can be determined thereby indicating the position of the print wheels 
Sensors are provided so that { TAIL ~ the rotational position } of { HEAD ~ each worm gear } can be determined thereby indicating the position of the print wheels
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH