Abstract: The ink cartridge comprises a casing closed on all sides, with a face wall having an aperture for receiving a tubular socket of the printing head. The casing contains a foam element impregnated with ink. It has locking elements for engaging arrester means of the printing head, as well as a second smaller aperture for feeding air. An elastomeric foil is provided between the face wall and the foam element, the foil having a hole smaller than the aperture and extending coaxially with the aperture. An edge zone of the smaller hole projects beyond an edge of the aperture and rests sealing against the sockets when the cartridge is inserted.

Abstract: A print head for an ink-jet printer comprises a housing having an exterior wall in which is carried a jet plate having ink ejection outlets. A wall in the housing defines an interior chamber having at least one side formed by a screen. A first flow passage leads from the interior of the chamber to the jet plate. Overlying the screen on the side of the screen external to the interior chamber is a connection including a tubular element having an inlet end with a porous sealing element for connection with an ink cartridge. A sealing ring surrounds the inlet end. The connection further includes a second flow passage for conducting ink from the inlet end through the interior of the tubular element to the screen external to the interior chamber.

Abstract: A print head includes a plurality of receiving chambers each for receiving an ink cartridge having an ink of a predetermined color. Each ink cartridge is separately replaceable. A common pump element on the housing of the print head is provided to recharge the ink cartridges after replacement.