Ink level sensing for disposable ink jet print head cartridges

Details Ink level sensing for disposable ink jet print head cartridges Ink level sensing for disposable ink jet print head cartridges

1992-11-24

1997-11-25

Yockey, David

Incremental printing of symbolic information

Ink jet

Controller

347 19, B41J 2195, B41J 29393

Patent

active

056917503

ABSTRACT:
A printer having a disposable print head which contains a consumable ink supply includes the capability of determining the level of ink in the print head without directly measuring the ink supply. The print head includes a number of resistors which can be driven to an open circuit condition by the printer. The printer includes a counter and memory for tracking the usage of the print head and a driver for selectively driving the print head resistors to an open circuit condition based upon such usage. The printer is also capable of detecting the condition of the resistors on the print head and producing a resultant visual display.

REFERENCES:
patent: 4074318 (1978-02-01), Kopes, Jr.
patent: 5049898 (1991-09-01), Arthur et al.
patent: 5068806 (1991-11-01), Gatten
patent: 5357347 (1994-10-01), Hirose et al.
patent: 5363134 (1994-11-01), Barbehenn et al.
Mono, M. Morris, Digital Design, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1984, pp. 30-31 and pp. 182-189.

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