Out-of-ink sensing method

Details Out-of-ink sensing method Out-of-ink sensing method

1989-08-08

1990-07-10

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

116227, G01D 1518, G01F 2300

Patent

active

049409972

ABSTRACT:
In an ink-jet printer, a ball check-valve (32) is used over the ink outlet (28) of an ink bag (16) to interrupt the flow of ink and/or air to the ink bladder when the ink supply in the bag falls below a predetermined level (40). The specific gravity of the ball is less than the specific gravity of ink in the bag but greater than the specific gravity of air.

REFERENCES:
patent: 3699914 (1972-10-01), Smith
patent: 4814786 (1989-03-01), Hoisington et al.
Loiselle, J. T., Bilevel Optical Ink Level Detector, Sep. 1975, IBM Technical Disclosure Bulletin, vol. 18, No. 4, pp. 1095-1096.

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