Ink detecting mechanism for a liquid ink printer

Details Ink detecting mechanism for a liquid ink printer Ink detecting mechanism for a liquid ink printer

1995-12-11

1998-02-24

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

B41J 201

Patent

active

057215740

ABSTRACT:
An ink detecting mechanism for a liquid ink printer including a liquid ink printhead having a plurality of ink carrying conduits terminated by an ink ejecting orifice. The ink detecting mechanism detects the presence of ink within the ink carrying conduits and includes a normally open circuit maintained in an open condition when said ink carrying conduit lacks the presence of ink. The fluid detecting device includes a detecting probe spaced from a transducer element located in the ink carrying conduit such that the presence of ink is detected for between the location of the detecting probe and the location of the transducer element. A signal is generated by a detection circuit for each of the channels of the printhead. Each signal is then summed and a decision signal is generated indicating whether or not the entire array of printhead nozzles should be primed. The detection of ink within the channels is performed without the need for ejecting ink from the channels.

REFERENCES:
patent: 5072235 (1991-12-01), Slowik et al.
patent: 5250957 (1993-10-01), Onozato
patent: 5488395 (1996-01-01), Takayanagi et al.

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