Patent ID: 8197042

Claim:
A detachable structure for an ink cartridge which is detachable with a printer, the structure comprising: an ink supply port provided in the ink cartridge for supplying ink to the printer; an inner stopper provided in the ink supply port, the inner stopper being pressed outward due to an inner pressure of the ink cartridge to close the ink supply port; a joint section provided in the printer, the joint section being coupled with the ink supply port to engage the ink supply port and having an ink flow path within the joint section that communicates with the ink supply port while the ink supply port is coupled the joint section; an insertion rod provided in the joint section for pushing the inner stopper into an inside of the ink supply port to communicate the ink flow path with the ink supply port while the ink supply port is coupled with the joint section; and an anti-outflow member slidably provided in the joint section, the anti-outflow member being urged toward an outside of the joint section and sliding along the insertion rod when the ink supply port is being inserted into the joint section so that, during withdrawal of the ink cartridge from the joint section, the anti-outflow member presses against the ink supply port, the anti-outflow member including a plate having an outer shape corresponding to an inner shape of the ink flow path.