Device for monitoring the ink supply in ink recording devices

Details Device for monitoring the ink supply in ink recording devices Device for monitoring the ink supply in ink recording devices

1978-06-21

1980-04-08

Goldberg, Gerald

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

346140R, G01F 2324

Patent

active

041966252

ABSTRACT:
A device for monitoring the supply of electrically conductive recording fluid in a supply container for ink recording devices and other recording devices utilizing recording fluid, employing electrodes which are wetted by recording fluid and a circuit arrangement which detects the electrical resistance between the electrodes and triggers a display device when the amount of recording fluid falls below a specific volume, in which a plurality of electrodes are provided within the supply container, two electrodes of which define therebetween a fluid-specific standard resistance, formed by the recording fluid, and two electrodes defined therebetween a resistance, formed by the recording fluid, which changes in dependence upon the level of the fluid, with at least those electrodes which detect the fluid-specific standard resistance being disposed in an area of the supply container which is constantly wetted by fluid.

REFERENCES:
patent: 2648058 (1953-08-01), Breedlove
patent: 3862571 (1975-01-01), Vogel

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