Patent ID: 9031427
Filing Date: 2015-05-12
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image formation portion that forms a toner image to transfer the formed toner image to a sheet; a fixing portion that includes a heating rotation member, a pressurizing rotation member which is pressed onto the heating rotation member to form a fixing nip, an exciting coil for inductively heating the heating rotation member and a temperature detection member for detecting a temperature of the heating rotation member and that passes, through the fixing nip, the sheet to which the toner image has been transferred so as to fix the toner image to the sheet; a main control portion that recognizes the temperature of the heating rotation member based on an output of the temperature detection member, and that recognizes a temperature abnormality, and stops a printing operation performed by the image formation portion and the fixing portion when the temperature of the heating rotation member is maintained at a fixing control temperature which is a temperature suitable for the fixing and the temperature of the heating rotation member falls within a predetermined temperature abnormality range; a notification portion that provides abnormality notification when the main control portion recognizes the temperature abnormality; a power supply portion that supplies power to the exciting coil; and a heating control portion that controls power supply from the power supply portion to the exciting coil and detects supply power to the exciting coil, that detects, when the detected supply power falls outside a predetermined supply condition, a power abnormality which is an abnormality in the supply power to the exciting coil, that stops, when the power abnormality is detected in a state that control for supplying power on the exciting coil is performed, the power supply to stop the induction heating and that provides, to the main control portion, stop notice indicating that the induction heating is stopped by the power abnormality, wherein the main control portion determines, based on a history of the stop notice from the heating control portion, whether or not the temperature abnormality is based on the stop of the induction heating, and the main control portion makes the notification portion notify a power supply abnormality when it is determined that the temperature abnormality is due to the stop of the induction heating whereas the main control portion makes the notification portion notify an abnormality in the fixing portion when it is determined that the temperature abnormality is not due to the stop of the induction heating.