Patent ID: 8235494

Claim:
An image forming apparatus comprising: a head configured to eject supplied ejection liquid onto a recording medium; a circulating path configured to collect the ejection liquid remaining in the head and circulate and supply the ejection liquid to the head again; an upstream side chamber arranged further on an upstream side with respect to an ink flowing direction than the head in the circulating path and configured to temporarily store the ejection liquid that should be supplied to the head through the circulating path; a downstream side chamber arranged further on a downstream side than the head and further on the upstream side than the upstream side chamber in the circulating path and configured to temporarily store the ejection liquid collected from the head; and a pressure-difference adjusting mechanism configured to select a first pressure state in which pressure in the downstream side chamber is lower than pressure in the upstream side chamber and a second pressure state in which the pressure in the upstream side chamber is lower than the pressure in the downstream side chamber.