Maximum liquid level in dual chamber ink-jet cartridge to control head pressure effect on ink containing porous member in an ink-jet printer

An ink tank cartridge for an ink-jet type recording apparatus, the ink tank cartridge comprising:

• a housing having a bottom wall, and first and second chambers said first and second chambers being in fluid communication through openings at the bottom and the top of the chambers;
• said first and second chambers being in fluid communication through openings at the bottom and the top of the chambers;
• an ink supply port extending through and projecting from said bottom wall, said port having an opening;
• a porous member accommodated in one of said first and second chambers, said porous member abutting said opening of said supply port;
• and,
• wherein the other of said first and second chambers is partially filled with ink to a predetermined level.

An ink tank cartridge for an ink-jet type recording apparatus, the ink tank cartridge comprising:

• a housing having a bottom wall and a plurality of side walls forming a cavity;
• a divider wall positioned within said cavity to divide said cavity into a first chamber and a second chamber said divider wall having an opening near the bottom wall and at the top of the chambers to allow fluid communication between said first and second chambers;
• an ink supply port extending through and projecting from said bottom wall, said ink supply port having an opening;
• a porous member accommodated in one of said first and second chambers, said porous member resiliently abuts said opening of said supply port;
• a groove formed in said bottom wall to direct and transfer ink from said porous member to said ink supply port;
• a filter positioned between said porous member and said ink supply port and positioned over said groove;
• and,
• wherein the other of said first and second chambers is partially filled with ink to a predetermined level.

An ink tank cartridge, for an ink-jet type recording apparatus, the ink tank cartridge comprising:

• a housing having a bottom wall and a plurality of side walls forming a cavity;
• a divider wall positioned within said cavity to divide said cavity into a first chamber and a second chamber said divider wall having an opening near the bottom wall and at the top of the chambers to allow fluid communication between said first and second chambers;
• an ink supply port extending through and projecting from said bottom wall, said ink supply port having an opening;
• a porous member accommodated in one of said first and second chambers, said porous member resiliently abuts said opening of said supply port;
• a groove formed in said bottom wall to direct and transfer ink from said porous member to said ink supply port;
• a filter positioned between said porous member and said ink supply port and positioned over said groove;
• and
• wherein the other of said first and second chambers is partially filled with ink to a predetermined level approximately 2 millimeters above an opening in said bottom wall said predetermined level of ink prevents excessive flow of ink through said opening of said bottom wall.