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Temperature controller for ink jet printing

  • US 5,623,292 A
  • Filed: 12/17/1993
  • Issued: 04/22/1997
  • Est. Priority Date: 12/17/1993
  • Status: Expired due to Fees
First Claim
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1. In an ink jet printer having a control cabinet, an ink supply in said cabinet and a remotely located printhead connected to said cabinet by an umbilical cord for supplying ink and control signals to said printhead the improvement comprising:

  • a) heat pump means comprising at least one thermoelectric device (TED) (40) disposed in said remotely located printhead (10) for transferring heat to or from said ink as a function of the polarity of the electric current applied to said TED;

    b) means (20) for measuring an ink temperature in said printhead (10);

    c) means (70) for comparing said ink temperature with a desired temperature range and for operating said TED to alter said ink temperature;

    d) heat exchange means (42) in said printhead in thermal relation with said TED (40) for transferring heat to or from said TED to enhance the ability of said TED to maintain said ink temperature within said desired range;

    e) said heat exchange means including a passageway (32, 34,

         36) running therethrough for circulating a heat exchange liquid and;

    f) means (50) for circulating said heat exchange liquid through said heat exchange means.

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