Image forming apparatus

An image forming apparatus in which a toner image is formed by feeding a toner to an electrostatic latent image formed on an image bearing member by electrophotography, by a developing device, the apparatus comprising:

• a transfer section which transfers the toner image borne on the image bearing member to a recording medium;
• a fixing section which heats the image toner transferred to the recording medium to fix the image toner to the recording medium, the fixing section comprising a heating section having a heat source for generating heat by current conduction provided therein, and arranged so as to be rotation-driven around an axis thereof, a pressure section provided so as to form a pressure-contact part between the pressure section and the heating section by coming into pressure-contact with the heating section, and a driving section which rotates the heating section by current conduction;
• a power source which applies a voltage to the fixing section;
• a voltage detection section which detects a voltage applied to the fixing section from the power source;
• a temperature detection section which detects a temperature of a surface of the heating section;
• and
• a fixing control section which controls the operation of the fixing section, the fixing control section comprising:
• a switching control section which controls switching on and off conduction operations between the heat source and the power source, and between the driving section and the power source;
• a voltage judgment section which judges as to whether or not a detected voltage by the voltage detection section is a given threshold voltage or more;
• a temperature judgment section which judges as to whether or not a detected temperature by the temperature detection section is a given preset temperature or higher;
• and
• a preparation control section which controls a preparation operation of the heating section before performing the operation of forming a toner image on the image carrier, wherein when the switching control section switches a conduction state to the heat source and the driving section from an off conduction state to an on conduction state and the voltage judgment section judges that the detected voltage by the voltage detection section is less than the threshold voltage, the preparation control section controls the preparation operation of the heating section such that the switching control section continues the on conduction state over a given idle time after the temperature judgment section has judged that the detected temperature by the temperature detection section is a preset temperature or higher.