Ink cartridge and ink jet printer that detects ink depletion

Details Ink cartridge and ink jet printer that detects ink depletion Ink cartridge and ink jet printer that detects ink depletion

1996-12-26

2000-01-11

Barlow, John

Incremental printing of symbolic information

Ink jet

Controller

347 86, B41J 2195, B41J 2175

Patent

active

060127937

ABSTRACT:
An ink cartridge is designed with a reduced number of component parts without deteriorating functions to prevent ink leakage and to detect ink depletion. The ink cartridge has an ink chamber including a foam holding chamber for holding a foam member saturated with ink to be supplied to the print heads and an ink holding chamber for holding ink to be supplied to the foam member. The ink chamber has ink filler ports for filling the ink chamber with ink and electrically conductive plug members, which are exposed to the ink chamber. The plug members close the ink filler ports and detect ink depletion in the ink chamber based on changes in electrical resistance between the plug members.

REFERENCES:
patent: 4940997 (1990-07-01), Hamlin et al.
patent: 5255019 (1993-10-01), Mochizuki et al.
patent: 5341161 (1994-08-01), Yamakawa et al.
patent: 5619238 (1997-04-01), Higuma et al.
patent: 5657058 (1997-08-01), Mochizuki et al.

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