Importance

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Abstract

An ink jet apparatus includes an ink jet head having a plurality of ejecting ports arranged in a predetermined pattern and a plurality of heat generating elements arranged corresponding to the ejecting ports, and a driving controlling means for applying a driving signal to heat generating elements 1e in response to a driving information wherein a printing mode of printing a printing medium by ejecting ink from the ejecting ports and a preliminary ejecting mode of performing no ejection toward the printing medium are settled for the apparatus. The driving controlling means includes a defoaming position changing means for changing the position of a defoaming point P.sub.B arising on each heat generating element 1e when ink is ejected in conformity with the preliminary ejecting mode. With this construction, a density fluctuation in character, image or the like can be eliminated, and moreover, a quantity of consumption of ink usable for preliminary ejection can be reduced compared with a conventional ink jet apparatus. In addition, an ink preliminary ejecting method to be practiced by the ink jet apparatus is also provided.

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First Claim