Patent ID: 7546052

Claim:
An image forming apparatus comprising: a main switch that permits an operation of the image forming apparatus by electric power of a main power supply according to turn-on of the main switch and prohibits the operation according to turn-off of the main switch; a fixing unit configured to have a heating roller; a first electric heater and a second electric heater provided in the heating roller; an electricity storage device that can be charged and discharged; and a first control section configured to charge the electricity storage device with the electric power of the main power supply when the main switch is off; a second control section configured to stop the charging of the electricity storage device by the electric power of the main power supply according to a situation when the main switch is off; a third control section configured to suspend, when the main switch is turned on, if the electricity storage device has been charged to that point, the charging; a fourth control section configured to actuate the first electric heater with the electric power of the main power supply and actuates the second electric with discharge electric power of the electricity storage device when the main switch is on and the warming-up of the fixing unit is necessary; and a fifth control section configured to resume, when the main switch is on and the warming-up of the fixing unit is finished, if the charging of the electricity storage device has been suspended by the third control section, the charging of the electricity storage device by the electric power of the main power supply.