Incremental printing of symbolic information – Ink jet – Controller
Patent
1993-04-26
1995-01-31
Reinhart, Mark J.
Incremental printing of symbolic information
Ink jet
Controller
B41J 2175
Patent
active
053862244
ABSTRACT:
A discrete ink level sensing system according to the present invention includes a level sensing probe (130) with at least first and second level sensing pads (178, 180) that is placed in an ink reservoir (28). The level sensing system uses electrical conductivity of the ink to detect when the upper surface level of the ink is lower than the lowest points of the level sensing pads. The upper and lower level sensing pads are electrically connected by a sense resistor (182). A voltage sensor (174) detects across the sense resistor a voltage that depends on the ink conductivity and the position of an upper surface level of the ink with respect to the lowest points of the first and second level pads. The value of the voltage is sent to a CPU (154) that signals a user that a predetermined amount of ink should be added to the reservoir.
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Buehler James D.
Crawford Clark W.
Deur Ted E.
Marantz Richard
Wood Brian J.
D'Alessandro Ralph
Reinhart Mark J.
Tektronix Inc.
Winkelman John D.
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