Patent ID: 8032046

Claim:
An image forming device that thermally fixes an unfixed image onto a recording sheet having the unfixed image formed thereon, by passing the recording sheet through a fixing nip between a pair of rotating members for applying pressure to the recording sheet, wherein in a standby state, rotation of the pair of the rotating members is controlled to stop, and a temperature of at least one of the pair of the rotating members is controlled to be kept at a given standby temperature, and in a low-temperature fixing state, the pair of the rotating members is controlled to rotate, and the temperature is controlled to be kept at a temperature lower than the standby temperature, in a high-temperature fixing state, the pair of the rotating members is controlled to rotate, and the temperature is controlled to be kept at a temperature higher than or equal to the standby temperature, the image forming device comprises: a determiner comprising: a first determiner operable to determine whether a last of a plurality of recording sheets on which an image is formed has passed through the fixing nip; and a second determiner operable to determine whether the control of the rotation and the temperature is performed in the low-temperature fixing state or the high-temperature fixing state wherein the determiner determines in affirmative when the first determiner determines in affirmative and when the second determiner determines the control of the rotation and the temperature is performed in the low-temperature fixing state; and a controller operable, if the determination by the determiner is affirmative, to control the temperature to be kept at a temperature being intermediate between the lower temperature and the standby temperature, and subsequently to control the temperature to be kept at the standby temperature.