| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a hollow roller containing a heating element and used in a fixing mechanism of an electrophotographic device and the like, capable of solving problems on lowering the manufacturing efficiency and increasing the manufacturing cost caused by the increase of the depreciation of mold, as the hollow roller is thinned to meet demands for reducing the power consumption and shortening a warm-up time, and a journal part is also thinned, which impairs the mechanical strength, and needs the complex machining to secure the strength in machining and the strength of a mounting structure of a driving gear and a driving pulley sheave. SOLUTION: The lowering of the manufacturing efficiency can be prevented by thickening the journal part while satisfying the demands for thinning an intermediate part of the hollow roller, and simplifying the mounting structure with driving components similarly as a conventional roller. The necking forming is performed on both ends of a material tube over a length corresponding to a length of the journal part to reduce inner and outer diameters and to increase the thickness. An outer diameter of the necking part is a thickness obtained by adding two times of the thickness by the specification and a proper finishing allowance to the inner diameter of the intermediate part, and then the outer periphery is cut and ground by the finishing allowance to manufacture the straight hollow roller.
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