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In a xerographic printer including a fuser having a heating element, a first predetermined power level is applied to the heating element. The voltage associated with the heating element is measured, yielding an output code which is applied to a look-up table. The output of the look-up table relates

In a xerographic printer including a fuser having a heating element, a first predetermined power level is applied to the heating element. The voltage associated with the heating element is measured, yielding an output code which is applied to a look-up table. The output of the look-up table relates to power to be applied to the heating element in a time interval T going forward: the output sets forth what power level is to be applied to the heating element for a smaller interval t within interval T, and what power level is to be applied to the heating element for the balance of the interval T.

대표청구항 ▼

1. A method of operating a heating element useful in fusing marking material to a sheet, comprising:applying to the heating element power at a first predetermined level; measuring a voltage associated with the heating element; and determining an output code in response to the measuring, the output c

1. A method of operating a heating element useful in fusing marking material to a sheet, comprising:applying to the heating element power at a first predetermined level; measuring a voltage associated with the heating element; and determining an output code in response to the measuring, the output code defining, for a subsequent time interval, a proportion of the interval at which power is to be applied to the heating element at a second predetermined level. 2. The method of claim 1, further comprisingapplying power to the heating element according to the output code. 3. The method of claim 1, wherein the first predetermined level is distinguished from the second predetermined level by a proportion of missing AC half-cycles.4. The method of claim 1, wherein the subsequent time interval has a duration of a predetermined number of AC half-cycles applied to the heating element.5. The method of claim 1, wherein the determining includes applying a number related to the measured voltage to a look-up table.6. The method of claim 1, wherein the determining includes applying a number related to the first predetermined level to a look up table.7. The method of claim 1, wherein the output code includes instructions relating to a power level to be applied to the heating element for a balance of the interval besides the proportion.8. The method of claim 1, wherein the proportion of the interval occurs at a beginning of the interval.