Image forming apparatus

摘要

Power is supplied from a capacitor (C) of an auxiliary power source (4) to a secondary heating element (2b) of a heating unit (2), thereby preventing temperature drop of a fixing roller (40) at the time of continuous paper delivery. An allowable range for starting discharge from the capacitor (C) is set to, for example, 30 to 40 volts. A discharge time in which the voltage of the capacitor (C) reduces to a termination value, such as 20 volts, is longer than a time necessary for a reading unit (11) to read a maximum number (for example, 100 sheets) of documents that can be read at one time.