| 摘要 |
In an ink jet printer in which preliminary ejection is performed onto printing paper, unnecessary ink consumption due to the preliminary ejection is suppressed. More specifically, the paper preliminary ejection is designed to be performed only for a printing head of cyan ink. For this cyan ink the longest duration of its non-ejection state, in which the printer can attain high printing quality when restarting printing after continuation of the non-ejection state in the case of not performing the paper preliminary ejection, is shorter than 1.6 seconds of the duration which is necessary for the reciprocal printing. This eliminates the paper preliminary ejection for the printing heads of the other colors of ink, thereby avoiding unnecessary ink consumption due to the paper preliminary ejection performed uniformly for every color of ink.
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