Ink cartridge

An ink cartridge comprising:

• a hollow ink tank body defining an accommodating chamber therein, said ink tank body having an ink outlet port and a mounted seat being formed on a bottom surface thereof;
• a cover member having an ink filling inlet formed therein, said cover member being fixedly secured to said hollow ink tank body and sealing said accommodating chamber of said hollow ink tank body;
• and
• a pressure regulator mounted on the mounted seat and having a box body, an elastic member, and a cover body, said cover body being constructed of rigid material and having an inner layer formed with four air holes on a periphery of the inner layer defining a platform between said air holes.

An ink cartridge comprising:

• a hollow ink tank body defining an accommodating chamber therein, said ink tank body having an ink outlet port and a mounted seat being formed on a bottom surface thereof;
• a cover member having an ink filling inlet formed therein, said cover member being fixedly secured to said hollow ink tank body and sealing said accommodating chamber of said hollow ink tank body;
• and
• a pressure regulator mounted on the mounted seat and comprising a box body, an elastic member, and a cover body;
• wherein said box body is constructed by rigid material and has at least one opening formed thereon, said cover body is constructed by rigid material and has an inner layer formed at least one air hole on a periphery of the inner layer defining a platform thereon, said elastic member is made by non-rigid, flexible material and has a valve layer protruded a ring therein defining a central hole;
• whereby
• the pressure regulator is closed because the ring cover the platform, until the value layer is drawn in by the force caused from a pressure difference during printing, the ring will shrink apart the platform and result in a gap between the ring and platform to let air flow in.