Patent ID: 9223265
Filing Date: 2015-12-29
Classification: G03G

Abstract:
1. An image forming apparatus, to which an option device is connectable, for forming a toner image on a recording material, the image forming apparatus comprising: an image forming unit configured to form an unfixed toner image on the recording material; a fixing unit, including a heater, configured to fix the unfixed toner image on the recording material; a temperature detection unit configured to detect a temperature of the fixing unit; a power control unit configured to control power to be supplied to the heater so that a detected temperature detected by the temperature detection unit becomes a target temperature for enabling fixing the unfixed toner image, and to set a maximum power suppliable to the heater according to a total power to be supplied to the image forming apparatus; a conveyance unit configured to convey the recording material to the fixing unit; and a conveyance control unit configured to control conveyance of the recording material, wherein the conveyance control unit executes, in a case where the maximum power is greater than a threshold power in a warm-up period of the fixing unit, a first mode where the conveyance unit conveys the recording material to the fixing unit according to a time that has elapsed from when power supply to the heater has started, and executes, in a case where the maximum power is less than the threshold power in the warm-up period, a second mode where the conveyance unit conveys the recording material to the fixing unit according to the detected temperature, and wherein the power control unit sets a larger value to the threshold power when the option device is connected to the image forming apparatus than a value set when the option device is not connected to the image forming apparatus.