| 摘要 |
A fixing apparatus for fixing an image on a record sheet [comprises] includes a fixing roller in which a heater is disposed, a pressing roller urged against the fixing roller, heat pipes extending in either one of the fixing and pressing rollers in a longitudinal direction thereof, and a temperature detection/control device for detecting [to control] and controlling a temperature of the fixing roller. In a typical embodiment, the heat pipes are disposed in the fixing roller to extend both through [an imaging portion] a sheet passage area, through which a record sheet passes, and through a [non-imaging portion] sheet non-passage area, through which no record sheet passes and the temperature detection/control device has a temperature detection device for detecting a temperature of the fixing roller in contact with the [non-imaging portion] sheet non-passage area. The temperature detection/control device is provided with a temperature regulating device for interrupting electricity to the heater when the fixing roller exceeds a predetermined temperature. In another embodiment, at least one of the heat pipes is provided in the fixing roller in parallel with an axis of the fixing roller, and a core of the fixing roller is produced by extrusion.
|
