Patent ID: 8425021

Claim:
An ink cartridge for a printer, comprising: a body having an opened surface and a predetermined shape to receive ink therein; a cover coupled with the body to define a desired space and provided with an ink filling port for injecting the ink into the body and an air inducing port that is in communication with the body so as to introduce air into the body or discharge the air from the body; a chamber instrument provided inside the body; and wherein the chamber instrument comprises a filling chamber having a space for receiving a part of the ink in the body, a discharging chamber connected with the filling chamber, an ink transferring channel for moving the ink received in the filling chamber to the discharging chamber, an air guiding hole for guiding air to an inside of the cartridge, an air suction valve that is in communication with the air guiding hole to allow the air introduced through the air guiding hole to enter and leave a space between the chamber instrument and the body and includes a check valve allowing air to float into an inner portion of the cartridge through the air guiding hole, and a pressure regulating valve that is in communication with the air guiding hole to discharge air in the body through the air guiding hole, thereby controlling an internal pressure of the body, and includes a check valve allowing air to be exhausted to an outside through the air guiding hole.