Abstract: A charging contact plate is used for preventing a primary charge roller of a cartridge used in a printer from shifting in a longitudinal direction and for charging the primary charge roller. The charging contact plate includes a main plate, a semicircle plate and a contact portion. The main plate has an end fastened on the cartridge and connected with a power supply within the printer. The semicircle plate has an end disposed at another end of the main plate. And, the contact portion has an end disposed at another end of the semicircle plate and has another end contacting with the primary charge roller.

Abstract: An ink cartridge includes an ink tank body having a plurality of surfaces defining an accommodating chamber therein and an ink outlet part disposed on one of the surfaces thereof. An ink porous member is positioned in the accommodating space of the tank body. A cover body has an ink charging inlet and an air inlet part communicated with the accommodating space of the tank body, respectively. A ventilated screw with a hollow ring is arranged on the air inlet part of the cover body and defining a ventilated channel therein. A tab mechanism is installed to a position on one side of the cover body. Whereby can efficiently supply ink to an ink delivery needle and avoid leaking during transportation, storage, or operation, and have a wrong prevention function.