Method and device for monitoring the operational state of a rese

Details Method and device for monitoring the operational state of a rese Method and device for monitoring the operational state of a rese

1998-06-25

2000-12-26

Royer, William J.

Incremental printing of symbolic information

Ink jet

Controller

B41J 2195

Patent

active

061647446

ABSTRACT:
In order to monitor the state of a reservoir made of electrically insulating material containing a normally electrically conductive product, ink for example, the free end of the outlet channel of the reservoir is connected to a predetermined potential and two measurement procedures are defined, the first of which results in a first measurement signal, a characteristic of which varies mainly with the quantity of product contained in the storage cavity of the reservoir, and the second of which results in a second measurement signal, a characteristic of which varies mainly with the electrical conductivity of the channel between its ends.
During the measurements, an abnormality correction procedure (or a simple alarm procedure) is triggered when the characteristic of the second measurement signal indicates a low electrical conductivity of the channel (absence of product) whilst the characteristic of the first signal indicates that there is still product in the storage cavity.

REFERENCES:
patent: 4788861 (1988-12-01), Lichti
patent: 5162817 (1992-11-01), Tajika et al.
patent: 5500657 (1996-03-01), Yauchi et al.
patent: 5682184 (1997-10-01), Stephany et al.
patent: 5724076 (1998-03-01), Ishida
patent: 5774136 (1998-06-01), Barbehenn et al.
patent: 5788388 (1998-08-01), Cowger et al.

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