Patent ID: 8783832

Claim:
An ink jet printing apparatus comprising: a receiving unit configured to receive an instruction to start a printing operation or a preliminary ejection operation; a first print head with a plurality of print elements configured to eject ink; a first heating unit configured to heat the first print head; a first temperature measuring unit configured to measure a temperature of the first print head; a second print head with a plurality of print elements configured to eject ink; a second heating unit configured to heat the second print head; a second temperature measuring unit configured to measure a temperature of the second print head; and a control unit configured to control the first heating unit and the second heating unit in such a manner that the first print head and the second print head reach a reference temperature, wherein if both the first temperature measuring unit and the second temperature measuring unit at least once measure that temperatures of the respective print heads have become equal to or higher than the reference temperature after the receiving unit receives the instruction, the control unit controllably starts the printing operation or the preliminary ejection operation using the first print head and the second print head when one of a temperature measured by the first temperature measuring unit and a temperature measured by the second temperature measuring unit is lower than the reference temperature at the start of the printing operation or the preliminary ejection operation.