US Patent 7506959 Inkjet printer and bubble removing method in inkjet printer

Disclosed is an inkjet printer including: a recording head having nozzles for ejecting ink; an ink tank for reserving the ink; an ink-flow passage for supplying the ink from the ink tank to the recording head; a valve for opening or closing the ink-flow passage; a filter disposed in the ink-flow passage between the valve and the recording head; a vacuum cap to be coupled to the recording head so as to cover an ejection opening of the nozzle when sucking an ink from the ejection opening; and a vacuum pump for sucking the ink from the ejection opening through the vacuum cap, wherein the printer includes a bubble-storing portion provided at least at a part of the ink-flow passage between the filter and the recording head, for storing a predetermined volume of bubble.