A printer including apparatus for reducing systematic print quality defects includes, in one embodiment, a printhead with variably spaced nozzles and, in another embodiment, a controller which varies the location along the carriage scan axis that ink is ejected from the nozzles....http://www.google.de/patents/US6231160?utm_source=gb-gplus-sharePatent US6231160 - Ink jet printer having apparatus for reducing systematic print quality defects
