MAXIMUM LIQUID LEVEL IN DUAL CHAMBER INK-JET CARTRIDGE TO CONTROL HEAD PRESSURE EFFECT ON INK CONTAINING POROUS MEMBER IN AN INK-JET PRINTER

摘要

An ink tank cartridge (A) has a housing (10) with a bottom wall (28) and a divider (22) that separates a housing cavity (20) into first (24) and second chambers (26). An ink supply port (42) with an opening (46) extends through and projects from the bottom wall. A porous member (40) is accommodated in one of the chambers and abuts the opening in the ink supply port. The other chamber is partially filled with ink to a pre-determined level. The predetermined level is approximately 2 millimeters above the opening in the bottom wall in a preferred arrangement. The predetermined level is used to prevent excessive flow of ink through the opening in the bottom wall. A groove (62) is formed in the bottom wall to direct and transfer ink from the porous member to the ink supply port.