US Patent 7758174 Ink supply system comprising air compressor and in-line valve

An ink supply system for an inkjet printhead is provided. The system comprises: (a) an ink reservoir for storing ink, the ink reservoir being contained in a pressurizable chamber; (b) an ink conduit providing fluid communication between the ink reservoir and the printhead; (c) a pressure device for positively pressurizing the chamber, the pressure device comprising an air compressor in fluid communication with the chamber; and (d) a valve in the ink conduit for controlling a supply of ink to the printhead.