Method and apparatus for cooling thermal ink jet print heads

Details Method and apparatus for cooling thermal ink jet print heads Method and apparatus for cooling thermal ink jet print heads

1990-10-05

1992-01-28

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, B41J 205, B41J 2175

Patent

active

050847139

ABSTRACT:
A thermal ink jet cartridge which avoids problems associated with internal heat generation. The cartridge uses a resistor assembly to eject ink from the cartridge. To control heat generated by the resistors, a cooling system is provided. The cooling system consists of an ink channel positioned adjacent the resistor substrate. The channel is supplied with ink from a chamber within the cartridge. Ink flowing through the channel contacts the substrate, causing a cooling effect. The ink is then returned to the chamber in the cartridge. If desired, a pumping system for enhancing ink flow through the channel may be provided. The system may consist of a thin-film resistor positioned adjacent at least one of the openings provided between the channel and the chamber. When the resistor is energized and heated, it causes ink to flow through the openings and back into the chamber.

REFERENCES:
patent: 4500895 (1985-02-01), Buck et al.
patent: 4791440 (1988-12-01), Eldridge
patent: 4896172 (1990-01-01), Nozawa
patent: 5019941 (1991-05-01), Drake

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