PURPOSE: To provide a reduction in warming-up time, a decrease in the axial temp. difference of a heating roller and a prevention of bearing heating by providing partition members between the heating roller and a heat generating pipe.

CONSTITUTION: There is ≥3mm clearance between the inside diameter of a roller body 1 which is supported by bearings 2 and is further attached with a gear 3 and the outside diameter of a halogen tube heater 4 even in the open port parts at both end sides of the body 1 where the outside diameter is reduced. Partition members 5 which narrow or close the spacing are provided by fitting the members onto the outside diameter of the heater 4 or fitting the same into the bone in the open ports on both end sides of the body 1. The members 5 are provided by using supplementarily stoppers 6 for the outside diameter of the heater 4 or may be fitted into the bore of the body 1. The members 5 are formed of metals, ceramics, asbestos, glass fibers, heat-resistant rubber and other suitable heat-resistant materials.