<p>A printing press having one or more printing units has a separate motor for driving each inker cam mechanism. Each inker cam mechanism tracks the speed and phase of a selected gear driven by the main drive shaft of the press, with zero long-term position error. The speed ratio between each inker and the main drive shaft is individually controllable and the phase position of each inker with respect to the main drive shaft gear being tracked is also individually controllable.</p>
