Patent ID: 7832821

Claim:
An inkjet printing apparatus including a plurality of inkjet printing heads for the same color ink arranged side by side in the conveying direction of a printing medium, each head formed of an array of nozzles for ink ejection in a direction crossing the conveying direction, the apparatus capable of dividing image data into pieces corresponding to the nozzle arrays, feeding the divided image data to the plurality of inkjet printing heads, and printing the divided image data, and further comprising: complementing means which, when a poorly ejecting nozzle is present in one of the ink jet printing heads, causes a corresponding nozzle of another inkjet printing head to complement a printing operation assigned to the poorly ejecting nozzle, wherein, the complementing means feeds the same piece of divided image data to the one inkjet printing head and the other inkjet printing head, and the complementing means makes invalid the printing operation of the one inkjet printing head only at a driving timing of the poorly ejecting nozzle, and makes valid the printing operation of the other inkjet printing head only at a driving timing of the corresponding nozzle.