| 摘要 |
PURPOSE:To prevent a sensor from deteriorating its accuracy and shortening its service life and also to control plural heaters by placing one end of an optical fiber so as to be movable along the axial direction of a roller, on one outside periphery of a heat roller, extending the other end of this optical fiber, opposing it to a photodetecting part of an infrared ray sensor, and fixing it. CONSTITUTION:Lamp heaters 5, 5' whose light emitting distribution is different from each other are provided on the inside of a heat roller 3, and on the other hand, a rail 6 is placed along the axial direction of the roller 3 at a suitable part of the outside, and limit switches 7, 7' are fixed to suitable parts of the vicinity of both end sides of the rail 6, respectively. Subsequently, a photodetecting part 9 of an optical fiber 8 is installed onto the rail between the limit switches 7, 7', and the photodetecting part 9 of the optical fiber 8 can execute a reciprocating motion between the limit switches 7, 7' by using a driving device which is not shown in the figure. |
