PURPOSE: To shorten a warm-up time by arranging in a storage battery so that the battery can be switched between a connection configuration wherein a charging circuit is formed with a charger and a connection configuration wherein a discharging circuit is formed with a heater and a DC power source.
CONSTITUTION: A heater driving means is equipped with a DC power source 3 which converts the output of a commercial power source 2 into a direct current and supplies it to the heater 1, the chargeable storage battery 4, and the charger 5 which is connected to the commercial power source 2 to charge the storage battery 4. When the power source is turned on and the connection of the storage battery 4 is switched to the connection configuration wherein the discharging circuit is formed with the heater 1 and DC power source 3, the capacity of the power source for the heater 1 increases to quicken the temperature rise of the fixing device. When the connection of the storage battery 4 is switched to the connection configuration where the charging circuit is formed with the charger 5, the storage battery 4 is charged without reference to whether the device is in fixing operation or in stand-by mode. Consequently, the target set temperature of the warm-up operation is lowered to shorten the time required for the warm-up operation.
HANADA SHINJI
TANAKA KAZUMOTO
