Patent ID: 6428154
Filing Date: 2002-08-06
Classification: B41J

Abstract:
An ink cartridge for use in an ink jet printing device, comprising:an outer casing provided with an atmosphere communication portion for bringing an inside of the casing into communication with atmosphere, an ink supply portion for supplying ink to said printing device, and a filling portion having a cylindrical hollow portion projecting inwardly of said outer casing for filling the casing with ink; and a plug integrally sealed to said filling portion, wherein said plug is inserted into the cylindrical hollow portion of said filling portion so as to establish a first contact portion between an inner surface of the cylindrical hollow portion of said filling portion and an outer surface of said plug, wherein a twisting vibration is applied at an abutment portion of the plug, the abutment portion of the plug being different from the first contact portion, so as to fuse the abutment portion, wherein the fused abutment portion is enlarged outwardly relative to the cylindrical hollow portion so as to establish the integral seal between said plug and said filling portion; and wherein enlargement of the fused abutment portion establishes a second contact portion between an inner surface of said cylindrical hollow portion and a fused outer surface of said plug, said second contact portion being different from the first contact portion and the abutment portion.