Image forming apparatus with a heat-controllable fixing unit and computer readable medium for image forming apparatus

摘要

An image forming apparatus, including an image forming unit, a fixing unit with a heater, an end temperature sensor to detect a temperature in an end area an end area of the fixing unit, and a controller, is provided. The controller is configured to perform a width obtaining step to obtain the width of the sheet, a temperature obtaining step to obtain the detected temperature of the fixing unit, a comparison step to compare the detected temperature with a threshold, a cooling step to let the end area of the fixing unit cool down when the detected temperature is one of higher and equal to the threshold, and a threshold-setting step to set one of a first value and a second value to be the threshold depending on the width of the sheet obtained in the width obtaining step.

主权项

1. An 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; an end temperature sensor disposed on an end area of the fixing unit with regard to a direction of width of the sheet; and a controller configured to perform:
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; anda 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 smaller than 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, the second value corresponding to a lower conveying velocity to convey the sheet than a conveying velocity corresponding to the first value.