Patent ID: 7380921

Claim:
A liquid-feeding system comprising: a liquid-using unit; a liquid chamber in communication with the liquid-using unit and adapted to hold liquid; a liquid storage storing liquid and attachable to the liquid chamber; a plurality of communication paths facilitating communication between the liquid chamber and the liquid storage and provided to the liquid chamber, the plurality of communication paths having a liquid flow path introducing the liquid in the liquid storage to the liquid chamber and an air flow path moving the air in the liquid chamber to the liquid storage; a pressure regulator disposed in the liquid storage and regulating the internal pressure of the liquid storage, wherein a space other than the plurality of communication paths and the liquid-using unit is substantially sealed and formed in the liquid chamber, wherein the liquid-feeding system changes the pressure equilibria in both of the liquid chamber and the liquid storage; and a pressure-changing unit configured to make the pressure in the liquid chamber comparatively higher than the pressure in the liquid storage, so as to move air in the liquid chamber to the liquid storage through the air flow path, wherein the pressure-changing unit includes a member and activating means, wherein the member defines at least a part of the liquid chamber, and wherein the activating means changes the pressure in the liquid chamber by being disposed at a part other than the liquid chamber and operating on the member.