Patent ID: 6910752

Claim:
An ink jet printing apparatus using a printing head capable of ejecting ink and printing on a printing medium by ejecting ink while moving at least one of the printing head and the printing medium relative to the other, said apparatus comprising: an encoder that outputs a pulse each time at least one of the printing head and the printing medium is moved a specified amount relative to the other; detecting means for detecting a time interval between the pulses; adjusting means capable of adjusting driving timings with which the ink is ejected from the printing head; calculating means for setting the time interval between the pulses obtained when at least one of the printing head and the printing medium is moved relative to the other with an expected relatively high reference speed as a reference time interval, and calculating a delay time for a driving timing for the printing head depending on the magnitude of a difference between the time interval between the pulses detected by said detecting means and the reference time interval; and control means for controlling said adjusting means depending on the delay time calculated by said calculating means.