Patent ID: 7510261
Filing Date: 2009-03-31
Classification: B41J

Abstract:
1. A printhead assembly comprising: (a) an inkjet printhead; (b) a plurality of ink reservoirs in fluid communication with nozzles in said printhead, wherein at least one of said ink reservoirs contains a cleaning liquid for cleaning an ink ejection face of said printhead; (c) a pressure device for positively pressurizing said ink reservoir containing said cleaning liquid; (d) a cleaning fluid conduit providing fluid communication between said ink reservoir containing said cleaning liquid and said printhead; and (e) a valve in said cleaning liquid conduit for controlling a supply of cleaning liquid to said printhead; (f) a pressure sensor for measuring a pressure in said ink reservoir containing said cleaning liquid or said cleaning liquid conduit; and (g) a controller in communication with said pressure sensor, said pressure device and said valve, wherein said controller is configured to coordinate a printhead purging/cleaning operation, said controller being configured to: