Patent ID: 8123316

Claim:
An image forming apparatus comprising: a print-job controller configured to receive a print job and control a printing operation based on the received print job; an ink-ejection driver configured to output a driving signal on the basis of the print job; an ink ejector configured to eject ink onto a paper sheet on the basis of the driving signal outputted by the ink-ejection driver; and an ink-temperature measuring unit configured to measure an ink temperature, wherein when the ink temperature measured by the ink-temperature measuring unit is equal to or higher than a first reference temperature, the ink-ejection driver outputs a driving signal of a first voltage, and wherein when the ink temperature measured by the ink-temperature measuring unit is lower than the first reference temperature and is equal to or higher than a second reference temperature that is lower than the first reference temperature, the print-job controller performs the printing operation as long as predetermined conditions are satisfied for suppressing lowering of print quality possibly caused by ink ejection based on a driving signal of a second voltage that is higher than the first voltage, and the ink-ejection driver outputs the driving signal of the second voltage while the printing operation is being performed.