PURPOSE: To prevent ink effectively from sticking to an outer peripheral part of an ink tank when the ink tank is detached by a method wherein an replacement workability of the ink tank is improved and generation of bubbles following taking out and putting in of the ink tank is enabled to be restrained.
CONSTITUTION: An ink cartridge is as follows; a tank opening 1a of an ink tank is sealed with a seal member 5 capable of being crushed, which is composed of a non-like permeable material; besides, a crushing promotion part 6 which crushes the seal member 5 when an ink supply pipe 4 is brought into contact with the seal member 5 in providing the ink tank 1, is formed to the ink supply pipe 4 of an ink jet head 3; or, a cylindrical part 7 which protrudes inside and compresses an ink absorbing material 2, is provided to an inner peripheral fringe of the tank opening part 1a; or a recess 8 which contains an elastic seal member 9 existing between the other peripheral fringe of the tank opening 1a of the ink tank 1 and a flange part 4a of the ink supply pipe 4 is provided to the outer peripheral fringe of the tank opening of the ink tank 1.
OGAWA KATSUHIDE
TOMIKAWA ICHIRO
ISHISE TATSUHIRO
