Patent ID: 8016398

Claim:
A liquid ejection apparatus comprising: an apparatus main body; a liquid ejection head for ejecting a liquid; a pump for supplying the liquid to the liquid ejection head; a working fluid supply source provided in the apparatus main body, the working fluid supply source having a drive mechanism; a liquid supply source containing the liquid; a working fluid supply line connecting the pump to the working fluid supply source, wherein, in response to actuation of the drive mechanism, the working fluid is supplied to the pump from the working fluid supply source through the working fluid supply line; a liquid supply line connecting the pump to the liquid supply source; a liquid outlet line connecting the pump to the liquid ejection head, wherein, in response to a change in a pressure of the working fluid, the pump draws the liquid from the liquid supply source through the liquid supply line, and is pressurized by the drive mechanism and supplies the liquid to the liquid ejection head through the liquid outlet line; a first one-way valve provided in the liquid supply line to only permit a flow of the liquid from the liquid supply source to the pump; and a second one-way valve provided in the liquid outlet line to only permit a flow of the liquid from the pump to the liquid ejection head.