US Patent 7905583 Ink supply system

The present invention comprises at least a reservoir tank which stores an ink supplied from an ink supply section, and an ink chamber which distributes and supplies the ink supplied from the reservoir tank to each recording head in a recording head group, wherein the reservoir tank maintains a predetermined negative pressure state with respect to the ink in a plurality of ink nozzles of each recording head through the ink chamber, and the ink chamber supplies the ink with an uniformed pressure loss in ink supply paths to each recording head in the recording head group.