Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1984-12-06
1985-11-05
Goldberg, E. A.
Recorders
Markers and/or driving means therefor
With ink supply to marker
346 75, 222212, 73304R, 101364, 400470, G01D 1518, B65D 3700, G01F 2326, E41F 3312
Patent
active
045517347
ABSTRACT:
An ink cartridge 10 includes an ink level sensor 38 having a probe supporting structure, such as platform 174, which projects into a collapsible ink container 16 from an ink container support 18. First and second electrical probes 40, 41 are embedded within the structure, with tip portions 188, 190 of the probes 40, 41 being exposed to provide an electrically conductive path through the ink between the probes. Flat closure surface 176, 178 are provided between the exposed portions of the probes against which the container 16 collapses. When the ink container 16 collapses against these surfaces 176, 178, the resistance between the probes increases, is insensitive to ink conductivity, and indicates that volume of ink within the cartridge is low. The platform 174 is supported by tapered necks 180, 182 projecting into the ink container from the ink container support 18. The probes 40, 41 extend through these necks 180, 182 and into apertures 184, 186 provided through platform 174, thereby exposing the probe tips 188, 190 to ink within the ink container 16.
REFERENCES:
patent: 3708798 (1973-01-01), Hildenbrand et al.
patent: 4196625 (1980-04-01), Kern
patent: 4202267 (1980-05-01), Heinzl et al.
patent: 4422084 (1983-12-01), Saito
patent: 4432005 (1984-02-01), Duffield et al.
Causley Gary C.
Rosback Martin D.
Goldberg E. A.
Peterson David P.
Preston Gerald E.
Tektronix Inc.
Winkelman John D.
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