Control circuit for regulating temperature in an ink-jet print h

Details Control circuit for regulating temperature in an ink-jet print h Control circuit for regulating temperature in an ink-jet print h

1993-12-14

1995-12-12

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 60, B41J 205

Patent

active

054754054

ABSTRACT:
A temperature control circuit regulates temperature in an ink-jet print head. The control circuit includes a thermal sensor mounted on the print head to measure its temperature and a temperature level detector to determine whether the measured print head temperature exceeds a threshold temperature. The temperature level detector outputs a first signal when the measured print head temperature exceeds the threshold temperature and a second signal when the measured print head temperature does not exceed the threshold temperature. The control circuit also has first logic circuitry to output warming pulses upon receipt of the second signal. The warming pulses have energy insufficient to deposit an ink drop from the print head. Second logic circuitry is configured to output warming pulses to non-selected nozzles of the print head and firing pulses to selected nozzles. In this manner, the print head is automatically warmed via the warming pulses so long as the print head temperature is below a prescribed level. An ink-jet print head incorporating the control circuit is also disclosed.

REFERENCES:
patent: 4492968 (1985-01-01), Lee et al.
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patent: 4847636 (1989-07-01), Durbeck et al.
patent: 4910528 (1990-03-01), Firl et al.
patent: 5059989 (1991-10-01), Eldridge et al.
patent: 5107276 (1992-04-01), Kneezel et al.
patent: 5168284 (1992-12-01), Yeung
Franco, Sergio "Design with Operational Amplifiers and Analog Integrated Circuits" McGraw Hill Publishing Co., 1988, pp. 293-4, 317-8.

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