Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1992-04-17
1994-02-22
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
73304R, B41J 2175
Patent
active
052892115
ABSTRACT:
The ink detecting device gives advance warning of the end of the ink in a reservoir or cartridge feeding an ink-jet thermal print head. The device comprises a pair of electrodes that are immersed in a spongy, ink-soaked body contained in the reservoir, and are arranged in a region adjacent to the feed duct at which the spongy body has a 30% to 100% higher capillarity than in remote regions. The electrodes are connected to a bridge circuit which measures the electrical resistance of the ink between the two electrodes.
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Morandotti Roberto
Scardovi Alessandro
Hartary Joseph W.
Ing. S. Olivetti & C., S.p.A.
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