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Temperature control method for a fixing device

  • US 5,287,155 A
  • Filed: 12/20/1991
  • Issued: 02/15/1994
  • Est. Priority Date: 12/21/1990
  • Status: Expired due to Fees
First Claim
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1. A temperature control method for a fixing device incorporated in image forming equipment and having a heat roller which has a heater contained therein and a thermistor for sensing a surface temperature of said heat roller, said method comprising the steps of:

  • (a) moving said thermistor between a contact position contacting the surface of said heat roller, and a non-contact position spaced apart from said surface of said heat roller;

    (b) on/off controlling said heater of said heat roller in response to a temperature measured at said non-contact position;

    (c) correcting said temperature measured in step (b) by comparing temperatures measured at said non-contact position and said contact position, respectively; and

    (d) stopping energizing said heater when a difference between said temperatures measured at said contact position and said non-contact position in step (c) does not lie in a predetermined range, thereby indicating that an error has occurred.

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