Patent ID: 7287825
Filing Date: 2007-10-30
Classification: B41J

Abstract:
1. A paper preliminary ejection method, which is used in an ink jet printing apparatus in which ink is ejected from a printing head for ejecting a plurality of kinds of ink to a printing medium to print an image, for performing ink ejection, unrelated to the image to be printed, on the printing medium, said method comprising: a step for, for each of the plurality of kinds of ink, determining information on predetermined time periods for each of a plurality of frequencies for paper preliminary ejection including a lowest frequency at which no paper preliminary ejection is performed, each predetermined time period being defined as a time period elapsing after an operation of discharging ink from the printing head with the paper preliminary ejection being performed at the corresponding frequency, wherein after the predetermined time period having been elapsed and upon starting of printing a predetermined image, no predetermined degradation of printed image occurs; and a step for, for each of the plurality of kinds of ink, comparing the predetermined time period for each of the plurality of frequencies with a time period from the operation of discharging ink to the next operation of discharging ink, and when the predetermined time period is shorter than the time period from the operation of discharging ink to the next operation of discharging ink, performing the paper preliminary ejection at a frequency higher than a frequency corresponding to the predetermined time period for the corresponding ink.