Patent ID: 8929752
Filing Date: 2015-01-06
Classification: G03G

Abstract:
1. A fixing device for fixing an unfixed toner image on a recording medium, comprising: a rotatable fixing member that is locally heated by a heater to produce a temperature distribution that includes areas across the fixing member in a direction of rotation of periodically changing temperature, and which contacts the recording medium bearing the unfixed toner image while rotating; the heater disposed inside the fixing member and turned on and off intermittently at a start of a fixing process to heat the fixing member intermittently; a first pressing member disposed opposite the fixing member to press against and rotate the fixing member to define a fixing nip through which the recording medium passes to fix the unfixed toner image with heat and pressure; and a temperature detector to detect the temperature distribution of the fixing member associated with an output control of the heater, the temperature detector being configured to actively detect whether or not the fixing member is rotated or moved by detecting the temperature distribution of the fixing member at a position on the fixing member within a passing area of the recording medium, wherein, when the temperature detector detects the temperature distribution of the fixing member associated with the output control that includes turning on and off the heater intermittently over a time period from a first time to a second time after the first time, the temperature detector detects over the time period whether or not the fixing member is rotated or moved.