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

1997-05-14

1999-10-12

Le, N.

Incremental printing of symbolic information

Ink jet

Controller

347 19, B41J 2195

Patent

active

059661445

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: 4595935 (1986-06-01), Brooks et al.
patent: 5049898 (1991-09-01), Arthur et al.
patent: 5200763 (1993-04-01), Tanuma et al.
patent: 5363134 (1994-11-01), Barbehenn et al.

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