Apparatus and method for heating ink to a uniform temperature in

Details Apparatus and method for heating ink to a uniform temperature in Apparatus and method for heating ink to a uniform temperature in

1993-03-02

1995-06-13

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 60, 347 88, B41J 2938

Patent

active

054247675

ABSTRACT:
A multiple-orifice phase-change ink-jet print head (28, 44) is heated by a composite laminate heater (29, 58) having multiple heating zones (31-31K, Z1-Z28) spanning the X- and Y-directions of the print head. The print head has multiple rows of ink-jet orifices (34, 46) spread across its face in the Y-direction with the ink in each orifice in each row requiring substantially the same temperature to ensure a uniform jetting velocity from every orifice. In one embodiment, the print head is in fluid communication with a thermally massive multicolor ink reservoir (52) that conducts heat through a region of contact (92) with the print head. A rotating drum (32), spaced across a gap (90) from the print head, draws air through the gap thereby cooling the print head differentially in the Y-direction. Radiation and convection are further thermal transfer mechanisms that contribute to a nonuniform temperature throughout the print heads. The heating zones of the print head heaters compensate for the various thermal transfer mechanisms to cause a uniform temperature throughout the print heads. A temperature controller ( 16) requires only a single temperature sensor (18, 104) to regulate print head temperature.

REFERENCES:
patent: 4395146 (1983-07-01), Arai
patent: 4418355 (1983-11-01), DeYoung et al.
patent: 5083143 (1992-01-01), Hoffman
patent: 5087930 (1992-02-01), Roy et al.
patent: 5285049 (1994-02-01), Fukumoto et al.

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