Abstract: An ink cartridge for an ink jet printing device includes a rigid body having an ink chamber for containing ink within the body and an ink output port at one end of the body such that the ink within the ink chamber is output from the output port. A porous transmit medium is placed within the ink chamber and has one end adjacently connected to the ink output port such that the ink within the ink cavity is transmitted to the ink output cavity from the transmit medium by capillary action. The porous transmission medium is in an n-shaped form, including an input end, an output end, and an impermeable sheath between the input end and the output end. Thus, in the process of ink jet printing, at the instant when the ink within the ink output port is ejected, the porous transmit medium transmits the ink to the ink output chamber. As a result, no leakage of ink and smooth ink delivery are achieved. In addition, the structure of the cartridge is simple and assembly is early.

Abstract: The ink-jet cartridge of the present invention includes two magnetic plates attached to the two sides of a flexible ink reservoir and facing each other with their sides of the same magnetic polarity. Alternatively, the two magnetic plates are attached to two flexible bags within the rigid ink reservoir and face each other with their sides of the same magnetic polarity. Due to the repulsive force generated by the two magnetic plates, a pressure regulating effect can be achieved within the ink reservoir to prevent ink leakage and provide smooth ink delivery while printing.