Patent ID: 7959267

Claim:
A liquid ejection apparatus comprising: a liquid ejection head that ejects liquid; and a switching device that switches a type of liquid supplied to the liquid ejection head between a first liquid and a second liquid different from the first liquid, the switching device including: a first supply passage through which the first liquid flows; a second supply passage through which the second liquid flows; a head supply passage extending to the liquid ejection head from a joining point between a downstream end of the first supply passage and a downstream end of the second supply passage; a first ON-OFF valve that selectively opens and closes the first supply passage at a position upstream from the joining point; a second ON-OFF valve that selectively opens and closes the second supply passage at a position upstream from the joining point; a rotary cam; and an actuator, wherein, when the cam rotates, the actuator is driven by the cam in such a manner that the first ON-OFF valve and the second ON-OFF valve are selectively opened and closed, the actuator operating the first and second ON-OFF valves in such a manner that one of the first and second ON-OFF valves becomes open and the other becomes closed, wherein the actuator includes a first actuator that closes the first ON-OFF valve and a second actuator that closes the second ON-OFF valve, and wherein the first actuator and the second actuator are driven commonly by the cam.