Image forming apparatus, method to control the image forming apparatus, and computer readable medium for the image forming apparatus

A method configured be implemented on a processor to control an image forming apparatus, the image forming apparatus comprising:

• an image forming unit configured to form an image in a developer agent on a sheet;
• a fixing unit comprising a heater, the fixing unit being configured to fix the image in the developer agent on the sheet;
• and
• an end temperature sensor disposed on an end area of the fixing unit with regard to a direction of width of the sheet;
• the method comprising:
• a width obtaining step, in which the controller obtains the width of the sheet;
• a temperature obtaining step, in which the controller obtains a temperature of the fixing unit detected by the end temperature sensor;
• a comparison step, in which the controller compares the detected temperature with a threshold;
• a cooling step, in which the controller manipulates the heater to let the end area of the fixing unit cool down when the temperature detected by the end temperature sensor is one of higher and equal to the threshold;
• and
• a threshold-setting step, in which the controller sets a first value to be the threshold when the width of the sheet obtained in the width obtaining step is one of greater and equal to a predetermined width, and in which the controller sets a second value being different from the first value to be the threshold when the width of the sheet obtained in the width obtaining step is smaller than the predetermined width.

A non-transitory computer readable medium storing computer readable instructions that are executable by a computer to control an image forming apparatus, when executed by the computer, the image forming apparatus comprising an image forming unit configured to form an image in a developer agent on a sheet;

• a fixing unit comprising a heater, the fixing unit being configured to fix the image in the developer agent on the sheet;
• and an end temperature sensor disposed on an end area of the fixing unit with regard to a direction of width of the sheet, the computer readable instructions being configured to cause the computer to control the image forming apparatus by performing:
• a width obtaining step, in which the controller obtains the width of the sheet;
• a temperature obtaining step, in which the controller obtains a temperature of the fixing unit detected by the end temperature sensor;
• a comparison step, in which the controller compares the detected temperature with a threshold;
• a cooling step, in which the controller manipulates the heater to let the end area of the fixing unit cool down when the temperature detected by the end temperature sensor is one of higher and equal to the threshold;
• and
• a threshold-setting step, in which the controller sets a first value to be the threshold when the width of the sheet obtained in the width obtaining step is one of greater and equal to a predetermined width, and in which the controller sets a second value being different from the first value to be the threshold when the width of the sheet obtained in the width obtaining step is smaller than the predetermined width.