In a printer, most of the motor drive applications are in relative motion. Often‐time though, it is necessary to
set a known Reference (usually re‐zeroing the position), for applications such as printing (zero against paper
edge), or for position limited mechanisms like the service station or carriage (zero against a reference
hardstop). For high precision paper motion, zeroing against a position on the encoder disk requires an
additional pattern, sensed by an additional sensor, to allow motion compensation against periodic positional
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INC, HP, "SENSORLESS NON-HARDSTOP BASED SERVOMOTOR POSITION REFERENCING", Technical Disclosure Commons, (March 19, 2019)