Ink jet print head cartridge assembly

摘要

The head comprises at least one nozzle (38) associated with two electrodes and carried by a holder (14) into which an ink cartridge (50) can be fitted. The cartridge is filled with ink and sealed after it has been filled. The cartridge terminates at one end with a cylindrical portion (60) which is closed by a diaphragm which can be ruptured upon insertion in the head. The diaphragm is ruptured by a tube (66) which projects within the holder and which communicates with the printing nozzles (38). The cylindrical portion (60) of the cartridge is offset with respect to the longitudinal axis of the cartridge to ensure correct insertion thereof. At the other end the cartridge is closed by a cover (87) having an aperture which is disposed above the free level (PL) of the ink and which is initially closed by a second diaphragm. The second diaphragm is ruptured by a movable suction conduit (102) which is manually fitted to the cartridge to lock the latter in position and to permit a pump to exhaust the gases which are formed during the printing operation. The printing head may comprise a holder having a plurality of housings in side-by-side relationship for the insertion of corresponding cartridges containing inks of different colors.