Patent ID: 9639039
Date: 2017-05-02
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a paper feeding tray configured to store papers; a conveying unit configured to convey a paper stored in the paper feeding tray; an image forming unit configured to form a toner image on the paper conveyed by the conveying unit; a fixing member configured to heat and fix the toner image formed by the image forming unit onto the paper; a temperature sensor configured to detect a temperature of the fixing member; a heater configured to heat the fixing member; a detection unit configured to detect that the temperature of the fixing member reaches a lower limit value at which the temperature once reduced by start of a heating and fixing process to the paper turns to rise, after an image forming operation starts; and a determination unit configured to determine a type of the paper based on at least one of an elapsed time from a predetermined reference time point after the image forming operation starts to a time point at which it is detected that the temperature of the fixing member reaches the lower limit value, and a temperature difference between the temperature of the fixing member at the reference time point and the lower limit value.