Patent ID: 7695123

Claim:
An ink supply system for an inkjet printhead comprising: (a) an ink reservoir for storing ink, said ink reservoir being contained in a pressurizable chamber; (b) an ink conduit interconnecting said ink reservoir and said printhead; (c) an air compressor in fluid communication with said chamber; and (d) a valve positioned between said air compressor and said chamber; (e) a first air conduit interconnecting an outlet of said air compressor and said valve; and (f) a second air conduit interconnecting an inlet of said air compressor and said valve, wherein said valve is switchable between: a first configuration in which said valve interconnects said outlet and said chamber via said first air conduit; and a second configuration in which said valve interconnects said inlet and said chamber via said second air conduit, thereby providing active control of ink pressure in said ink reservoir and said printhead.