Importance

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Abstract

An ink jet printer has a drum rotated about its axis and past a translatable print bar located adjacent and parallel thereto. The print bar has equally spaced, identical print heads mounted along the length thereof to print images on the drum or directly on a recording medium mounted on the drum. Each print head has an array of high density nozzles that extend for a predetermined length. The spacing between print heads is equal to the integer multiples of the nozzle array length. The print bar may be translated a distance equal to a integer divisor of the nozzle array length up to one full nozzle array length during each drum revolution. The drum rotation and concurrent print bar translation produce barber pole shaped swaths of image on the drum by each print head. Multiple passes of the drum are required to print a complete image.

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First Claim