Patent ID: 7434924

Claim:
An ink cartridge detachably mounted with respect to an image forming apparatus body and supplying a developing unit with ink, comprising: a housing comprising an inflow inlet into which ink flows; and an inflow inlet opening and closing unit for operating together with the image forming apparatus body such that when the housing is mounted in the image forming apparatus body a center portion of the inflow inlet is opened and a remaining portion of the inflow inlet remains closed, wherein the inflow inlet opening and closing unit comprises: a moving member installed in the housing so as to move in first and second directions; at least one expanding tube bag installed in the inflow inlet for expanding and shrinking depending on an inflow amount of liquid to close and open the inflow inlet, respectively; and a liquid feeding unit for selectively feeding the liquid to and withdrawing the liquid from the at least one expanding tube bag depending on a movement direction of the moving member.