Ink jet print head pressure and temperature control circuits

Details Ink jet print head pressure and temperature control circuits Ink jet print head pressure and temperature control circuits

1977-08-25

1978-11-14

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

73708, 219496, 219499, 323 75A, G01D 1516

Patent

active

041258452

ABSTRACT:
An electronic circuit for sensing and controlling the pressure and temperature of ink within an ink jet print head. Ink pressure is monitored by a pair of strain gauges electrically connected into a bridge whose output controls an ink supply valve. Part of that bridge is utilized with additional elements to form a second bridge for monitoring through one of the strain gauges the temperature of the ink jet head, accompanied with a heater of the head that is driven from the temperature signal to maintain the head temperature above a preset temperature.

REFERENCES:
patent: 3429178 (1969-02-01), Durbin
patent: 3946398 (1976-03-01), Kyser
patent: 3967188 (1976-06-01), Spencer

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