Patent ID: 8027597

Claim:
An image forming apparatus, comprising: an auxiliary power source device for storing electric power of a commercial power source and supplying the stored electric power; a fixing device including: a first heat generator for generating heat for a fixing processing, the first heat generator using electric power supplied by the commercial power source; and a second heat generator for generating heat for the fixing processing, the second heat generator using electric power supplied by the auxiliary power source device; a heat generation controller for allowing the first heat generator and the second heat generator to generate heat; an image forming section for forming an image on a recording sheet, the image forming section including the fixing device and a sheet conveyance path to allow the recording sheet to pass through the fixing device along the sheet conveyance path; a sheet jam detector for detecting a sheet jam of a recording sheet which occurs in the image forming section; a charged capacity detector for detecting a charged capacity of the auxiliary power source device; a charge controller for allowing charging of the auxiliary power source device to start when the sheet jam detector detects a sheet jam, and the charged capacity detector detects no full charge of the auxiliary power source device; and a cover operation detector for detecting a closing of an openable cover provided on a housing of the apparatus for allowing a user to treat a sheet jam, wherein the charge controller allows the auxiliary power source device to continue charging, and the heat generation controller allows only the first heat generator to generate heat to start up the fixing device when the cover operation detector detects the closing of the cover after the sheet jam detector detects no sheet jam, and the charge capacity detector detects no full charge of the auxiliary power source device, and the heat generation controller allows the first heat generator to generate heat with electric power which is equal to or less than a remaining electric power after subtracting electric power used by the charge controller for charging from rated electric power of the commercial power source when the cover operation detector detects the closing of the cover after the sheet jam detector detects no sheet jam, and the charge controller allows the auxiliary power source device to continue charging.