| 摘要 |
PURPOSE:To improve thermal responsiveness and to simplify a temp. control unit by bringing a heater part having a positive coefft. of resistance temp. into contact with the inside part of a metallic roller via an insulation layer. CONSTITUTION:A heater part 2 consisting of heating elements having a positive coefft. of resistance temp. is formed to a cylindrical shape provided with electrode layes on both inside and outside surfaces. The part 2 is incorporated in the bore of a metallic roller 1 in tight contact therewith via an insulation layer 3, and both the part 1 and the part 2 are made rotatable. Sliding electrodes 4a, 4b mounted to both inside and outside electrode layers of the part 2 are so formed as to slide on the stationary electrodes 8a, 8b fixed to the center of the part 1, and the leads are drawn to the outside through the sliding electrodes and the stationary electrodes. Since the part 2 is in tight contact thermally with the part 1, thermal responsiveness is improved, and since the part 2 is of self-temp. control type, the need for any temp. control unit is eliminated. |
