Image forming apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorJong In HWANG
Life of this patent
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Abstract
An image forming apparatus having a heating roller and a pressing roller includes a temperature sensing unit provided to be broken when the heating roller is overheated and a pressure releasing control unit provided to release the pressing roller from the heating roller when the temperature sensing unit is broken, when a microcomputer erroneously operates due to a damage of an A/D port of the microcomputer, such that the pressing roller is forcibly released from the heating roller by the pressure releasing control unit, thereby preventing the heating roller and the pressing roller from being fused to each other.
Claims20
An image forming apparatus including a fixing unit having a heating roller and a pressing roller pressed against the heating roller, the image forming apparatus comprising:
- a pressure releasing unit that releases the pressing roller from the heating roller;
- a temperature sensing unit, which is broken when the heating roller is overheated;
- and
- a pressure releasing controller controlling an operation of the pressure releasing unit to release the pressing roller when the temperature sensing unit is broken.
An image forming apparatus comprising a fixing unit having a heating roller and a pressing roller pressed against the heating roller, the image forming apparatus comprising:
- a pressure releasing unit that releases the pressing roller from the heating roller;
- a first temperature sensing unit provided to sense a temperature of the heating roller;
- a second temperature sensing unit which is broken when the heating roller is overheated;
- a first pressure releasing controller to control an operation of the pressure releasing unit to read a temperature of the heating roller by the first temperature sensing unit and to release the pressing roller when the heating roller is overheated;
- and
- a second pressure releasing controller to control the operation of the pressure releasing unit to release the pressing roller when the second temperature sensing unit is broken.
An image forming apparatus having a heating roller and a pressing roller, comprising:
- a temperature sensing unit to detect a temperature of the heating roller;
- and
- a pressure releasing unit to selectively move the pressing unit with respect to the heating roller according to the detected temperature and a state of the temperature sensing unit.
Dependencies are inferred from the claim text.