Ink containing device and ink supply device

An ink containing device comprising:

• an ink cartridge comprising:
• a first main body comprising a first surface facing a first direction and a chamber configured to store ink;
• an ink outlet portion disposed on the first surface of the first main body and configured to direct the ink from the chamber to an exterior of the first main body;
• and
• an ink detecting portion configured to detect the ink stored in the chamber;
• and
• an adapter configured to selectively attach to the ink cartridge, the adapter comprising:
• a second main body;
• and
• a movable member configured to move with respect to the second main body,
• wherein the movable member is configured to move between a first position and a second position,
• wherein the movable member is in the first position when the ink cartridge detaches from the adapter,
• wherein, when the adapter attaches to the ink cartridge, the movable member is configured to move in the first direction from the first position to the second position, which is downstream from the first surface in the first direction,
• wherein the adapter comprises a first wall facing the first direction and a first opening formed in the first wall, the first wall of the adapter comprises a second surface facing the first surface of the first main body in a second direction opposite to the first direction,
• wherein the ink outlet portion is exposed to the exterior of the second main body, the ink outlet extends through the first opening when the adapter attaches to the ink cartridge,
• wherein the adapter comprises a third surface facing a third direction, and an electrical interface is disposed on the third surface, and
• wherein the ink detecting portion is disposed downstream from the ink outlet portion in the third direction and the electrical interface is disposed downstream from the ink detecting portion in the third direction when the adapter attaches to the ink cartridge.