A label printer having a stepping motor and the ability to dynamically accurately control longitudinal label registration as a function of steps of the stepping motor. The effective length of the steps moving the labels between a known point prior to the printhead and the printhead are monitored...http://www.google.de/patents/US5803624?utm_source=gb-gplus-sharePatent US5803624 - Methods and apparatus for compensatng step distance in a stepping motor driven label printer 
