Patent ID: 7283280

Claim:
A method of printing using two printheads in communication with each other, each printhead having a plurality of nozzles, each of which discharge ink to produce an ink dot to print the image, comprising the steps of: loading each nozzle with ink, sensing the temperature of each printhead; if the temperature of the printheads is at the required temperature, printing said ink; if the temperature of one or more of said printheads is below the required temperature, heating the respective printhead by firing a short pulse to each nozzle of the the respective printhead, said pulses being insufficient to discharge ink from the nozzle, but sufficient to heat up the printhead; sensing the temperature of each printhead; repeating the steps of heating the printhead and sensing the temperature of each printhead until the required temperature is reached in both printheads; and printing said image, simultaneously by both printheads.