Patent ID: 7672607

Claim:
A fixing device, comprising: a fixing rotary body including a first heat source; a pressing rotary body including a second heat source; and a control device configured to cause, during a time of warm-up of said fixing device and prior to a surface temperature of said fixing rotary body rising to a preselected warm-up temperature, said fixing rotary body to rotate while causing at least one of said first heat source and said second heat source to generate heat, to allow, after the surface temperature of said fixing rotary body has risen to the preselected warm-up temperature, a sheet pass or a printing to be executed, and to cause said fixing rotary body to rotate for a preselected period of time, while said sheet pass or said printing is not executed, after the surface temperature of said fixing rotary body has risen to the preselected warm-up temperature, wherein the rotation of said fixing rotary body is continued while said sheet pass or said printing is not executed, when the surface temperature of said fixing rotary body has risen to the preselected warm-up temperature.