Capillary reservoir binary ink level sensor

Details Capillary reservoir binary ink level sensor Capillary reservoir binary ink level sensor

1989-10-18

1992-01-07

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

With ink supply to marker

73323, 116276, B41J 2125, G01D 1300

Patent

active

050795708

ABSTRACT:
An ink level sensor (18, 18', 18") is provided for detecting the level of ink in an ink cartridge (10) containing a capillary reservoir (14), such as foam, therein. The ink level sensor is a binary fluidic indicator, which provides both a human and machine readable indication of the level of the ink. A plurality of embodiments are described, including a two-port sensor (20), a one-port sensor (22), and a pair of fluidically-connected needles of different length (24).

REFERENCES:
patent: 3708798 (1973-01-01), Hildenbrand et al.
patent: 4015272 (1977-03-01), Yamamori et al.
patent: 4376490 (1983-03-01), Mizusaki
patent: 4380772 (1983-04-01), Italiano
patent: 4604633 (1986-08-01), Kimura et al.
patent: 4607266 (1986-08-01), DeBonte
patent: 4610202 (1986-09-01), Ebinuma et al.
patent: 4771295 (1988-09-01), Baker et al.

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