An image forming device that uses only one temperature sensor to detect temperatures of the recording sheet and a rotation member for fixing, and can perform the temperature adjustment control carefully in detail during the image forming operation. One of the positions is the retracted position with the fin assembly housed within a longitudinally and transversely extending cavity along the shoe’s sole. The input device takes an image of the infrared light radiated by the infrared radiation emitters, and also receives an input from a user. One method of identification uses an advanced randomized error-tolerant non-adaptive group testing technique and a clique-independent set problem solution.