Electrostatographic single-pass multiple station printer with improved colour registration

摘要

The present invention provides improved electrostatographic single-pass multiple station printers as well as methods of operating the same being able to avoid displacement of different color images by effects of the toner coverage of the printed pages. To obtain this, a main encoder means (50) and a printing medium advancement measurement means (60a) are provided, the main encoder means (50) for producing a first signal (501) indicative of printing medium displacement and the printing medium advancement measurement means (60a) for providing a second signal (601) representative of printing medium advancement. The printing medium advancement measurement means (60a) is adapted to co-operate with the main encoder means (50) for automatic adjustment of said first signal (501) using said second signal (601).