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Conventional ink jet printers use an ink jet head which discharges ink droplets by heating of a heat element such as a heater, for example, to perform printing on a printing medium such as paper.
In such a printer using an ink jet head, in addition to the discharged ink droplets which remain on the surface of a medium on which printing is performed, there are ink droplets remaining within a head that cannot be discharged.
When such remaining ink droplets are left unattended, the ink droplets flowing along the surface of a medium may be removed by contacting the medium, thus wetting the medium and being then removed. If the resulting removal ink droplets include solvents or additives which cause clogging of an ink discharge port or a nozzle of the head, the removal ink droplets may cause a deterioration in the quality of printing. Accordingly, in conventional ink jet printers, upon detection of the existence of any ink droplets remaining in the ink jet head, the head is purged to discharge those ink droplets remaining in the head.
In a conventional ink jet printer, prior to detection of the presence of ink droplets in the ink jet head, the head is required to be primed by discharging ink from the head before formation of a printing image on a paper medium. This is because of the high viscosity of 0b46394aab