Patent ID: 7309121

Claim:
An ink supplying system, comprising: a replaceable ink tank configured to contain ink and perform recording; and an ink supplying unit, connected to the ink tank through a plurality of communication paths, facilitating supplying ink introduced from the ink tank to a recording head, the ink supplying unit having a substantially sealed space other than at a portion of connection of the recording head and the plurality of communication paths, wherein the ink in the ink tank is introduced into the ink supplying unit through at least one of the communication paths, and gas in the ink supplying unit is transported into the ink tank through at least a different one of the communication paths, wherein the ink tank includes a first storage unit configured to store information regarding a residual amount in the ink tank, the ink supplying unit including a second storage unit configured to store information regarding a residual ink amount in the ink supplying unit, and wherein an ink amount to be used for recording can be calculated based on the information regarding the residual ink amount stored in the first and the second storage units.