Patents Assigned to Ing. S. Olivetti & C., S.p.A.
  • Ink detecting device for a liquid-ink printing element
    Patent number: 5289211
    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.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: February 22, 1994
    Assignee: Ing. S. Olivetti & C., S.p.A.
    Inventors: Roberto Morandotti, Alessandro Scardovi