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Laser printer power saver

  • US 5,321,428 A
  • Filed: 09/04/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 09/04/1992
  • Status: Expired due to Term
First Claim
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1. A system for operating a printer having a fuser-heater comprising:

  • means for initializing the printer by turning on the fuser-heater and printer circuitry, and readying the printer to accept print request and data;

    means for transmitting a print request and data to be printed to the printer;

    means for ascertaining, when a print request is received, whether the printer is initialized, and if it is, whether the fuser-heater is off, on but not at operating temperature, or on and at operating temperature;

    means for turning the fuser-heater on in response to the condition that a print request and data is received, the printer is initialized, and the fuser-heater is off;

    means for limiting the data acceptance rate at the printer to a rate less than the maximum rate in response to the printer being initialized and the fuser-heater being on and not at operating temperature, and accepting data at maximum rate in response to the printer being initialized and the fuser-heater being on and at operating temperature;

    means for measuring time in response to the condition that the printer is initialized, a print request and data is received, and the fuser-heater is on and at operating temperature, the measured time reset to zero each time a print request is received; and

    means for turning off the fuser-heater when the measured time reaches a preset maximum time without being reset to zero.

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