Patent ID: 8419174

Claim:
A cartridge for an ink-jet printer comprising a cartridge body, a protective cover moving relative to the cartridge body under pressure, a detection mechanism for the cartridge and remaining ink volume, said cartridge body including an ink storage chamber, an ink outlet for providing ink to the printing head and an air inlet, characterized in that said detection mechanism for the cartridge and remaining ink volume includes first and second detecting members respectively matching to first and second sensors on the printer, and a soft support cap set on the cartridge body and connecting to the ink storage chamber, of which the said second detecting member includes a movable lever, a fixed shaft set on the cartridge body, and a position adjustment member for the movable lever set on the protective cover, said movable lever is connected to the rotating shaft of the cartridge body through the fixed shaft, said movable lever is positioned to rest on said soft support cap such that when the volume of ink in the ink storage chamber decreases, the volume of the soft support cap decreases causing the movable lever to move from a position blocking the second sensor to a position not blocking the second sensor thus indicating to the printer there is insufficient ink left in the ink storage chamber.