Patent attributes
A printer comprising:an inkjet printhead having an ink inlet, an ink outlet and a plurality of nozzles;a priming system for priming the printhead, the priming system comprising:an ink chamber having an outlet port connected to the ink inlet via an upstream ink line;an air pump having a pump outlet communicating with a headspace above the ink in the chamber;a sensor positioned for sensing ink in a downstream ink line connected to the ink outlet, the sensor cooperating with the pump such that the pump is shut off when the sensor senses any ink; andmeans for minimizing phantom sensing of ink caused by ink bubbles in the downstream ink line,wherein, in a priming configuration, the pump is configured to positively pressurize the headspace until the sensor senses ink.
