Patent ID: 8162457

Claim:
An ink supply device comprising: a cartridge mounting portion for an ink cartridge, the ink cartridge including: an ink chamber for storing ink, the ink chamber including a hole through which an inner space of the ink chamber is capable of communicating with an outside; and a cover which is configured to cover the hole; wherein the cartridge mounting portion includes a cylinder extending in a direction intersecting with a gravity direction and is configured to removably mount thereon the ink cartridge while opening the cover by the cylinder; wherein the cylinder comprises a tip surface including: a first contact surface provided in at least an entire first region of the tip surface and configured to contact the cover, the first region being defined as a region above an upper end of an inner surface of the cylinder in the gravity direction; a second contact surface provided in a second region other than the first region and configured to contact the cover; and a passage provided to extend in a radial direction of the cylinder to allow an inner space of the cylinder to communicate with an outside; wherein any passage provided in the tip surface to extend in a radial direction of the cylinder to allow an inner space of the cylinder to communicate with an outside does not pass the first region; and wherein the second contact surface is provided at a lowest part in the second region in the gravity direction.