Importance

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Abstract

In case a defect in the ink discharge performance is generated in a nozzle in an ink jet printing head, the printing is executed by a main scanning operation of a printing head, excluding data corresponding to such defective nozzle. Then, a sub-scan is executed by a width corresponding to the defective nozzle, and the complementary printing is executed with a complementary recording nozzle without abnormality, in the returning main scan. When the total sum of the number of drives of the complementary recording nozzle exceeds a predetermined value, the amount of sub-scan for complementary recording, thereby changing the nozzle used therefor. In this manner, even in case of abnormality in a recording element, a defect-free record can be obtained by the complementary recording, and a substantial service life of the recording head can be extended in case of obtaining such defect-free record by the complementary recording.

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First Claim