Patent ID: 6502933
Filing Date: 2003-01-07
Classification: B41J

Abstract:
An ink cartridge for an ink jet printer having an ink storing portion for containing ink and a head for ejecting droplets of the ink stored in the ink storing portion, wherein the ink storing portion comprises:a chamber filed with ink in a liquid state; a negative pressure maintaining means comprising a pressing member maintaining the pressure of the inside of the chamber to be negative; and a uniform supply guide means, installed between the chamber and the head, for guiding the ink in the chamber to be uniformly supplied to the head, the negative pressure maintaining means comprising: an accommodating portion having one side open and a through hole connected to the chamber formed at the other side thereof; and a first sponge installed in the accommodating portion to contact the through hole, said pressing member comprising a screw installed at the accommodating portion and having a hole formed therein to connect the open side of the accommodating portion and the side thereof toward the first sponge pressing the first sponge toward the through hole to decrease pore size of the first sponge.