Fixing device comprising controller which judges whether or not fixing belt is rotating and image forming apparatus including same

A fixing device comprising:

• a fixing belt configured to be rotatable;
• a pressuring member configured to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip;
• a heat source configured to heat the fixing belt;
• a pressing member configured to press the fixing belt to a side of the pressuring member;
• a temperature sensor configured to detect a temperature of the fixing belt;
• and
• a controller into which the temperature detected by the temperature sensor is inputted,
• wherein the fixing belt includes a base material layer and an elastic layer provided around the base material layer,
• wherein a detected region whose temperature is detected by the temperature sensor is formed in the fixing belt, and the elastic layer of the detected region is provided with a hole in a part thereof in a circumferential direction, and
• wherein the controller judges that the fixing belt is rotating in a case where the temperature detected by the temperature sensor alternately increases and decreases in a state that the heat source is heating the fixing belt, and judges that the fixing belt is not rotating in a case where the temperature detected by the temperature sensor does not alternately increase and decrease in the state that the heat source is heating the fixing belt,
• wherein the heat source is placed at an inner diameter side of the fixing belt, and
• wherein an inner circumferential face of the detected region has higher thermal absorptivity than an inner circumferential face of regions other than the detected region of the fixing belt.

A fixing device comprising:

• a fixing belt configured to be rotatable;
• a pressuring member configured to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip;
• a heat source configured to heat the fixing belt;
• a pressing member configured to press the fixing belt to a side of the pressuring member;
• a temperature sensor configured to detect a temperature of the fixing belt;
• and
• a controller into which the temperature detected by the temperature sensor is inputted,
• wherein the fixing belt includes a base material layer and an elastic layer provided around the base material layer,
• wherein a detected region whose temperature is detected by the temperature sensor is formed in the fixing belt, and the elastic layer of the detected region is provided with a hole in a part thereof in a circumferential direction, and
• wherein the controller judges that the fixing belt is rotating in a case where the temperature detected by the temperature sensor alternately increases and decreases in a state that the heat source is heating the fixing belt, and judges that the fixing belt is not rotating in a case where the temperature detected by the temperature sensor does not alternately increase and decrease in the state that the heat source is heating the fixing belt,
• wherein the elastic layer of the detected region has higher thermal conductivity than the elastic layer of regions other than the detected region of the fixing belt.