Patent ID: 8229312
Filing Date: 2012-07-24
Classification: G03G

Abstract:
1. An image forming device comprising: a heater; a heat application rotation member heated by the heater; a pressure application rotation member heated by the heat application rotation member; a detector configured to detect a surface temperature of the pressure application rotation member; and a controller configured to control rotation speed of the heat application rotation member and the pressure application rotation member, wherein after rotation of the heat application rotation member and the pressure application rotation member is started at a first rotation speed during a warm-up period, the controller changes the first rotation speed to a second rotation speed, the second rotation speed depending on an amount of temperature change detected by the detector, and being maintained until the surface temperature of the pressure application rotation member detected by the detector reaches a predetermined temperature, and the amount of temperature change of the surface temperature that is detected by the detector is calculated by the controller based on a temperature increase value that is measured at a predetermined time after the heater begins to heat the heat application rotation member and after the controller begins rotating the heat application rotation member and the pressure application rotation member at the first rotation speed.