| 摘要 |
A developing roller installed in an image forming apparatus to transfer a toner to a photosensitive member and a manufacturing method of the developing roller include a roller member having an outer cylindrical vessel, an inner vessel installed within the outer cylindrical vessel in concentric with the outer cylindrical vessel, a hollow portion formed at a center of the inner vessel, and a plurality of ribs connecting and supporting the outer cylindrical vessel and the inner vessel so as to connect and support the outer cylindrical vessel and the inner vessel, and a rotating shaft compressively fitted into the hollow portion of the inner vessel. The developing roller as stated above is manufactured by integrally extruding and drawing the outer cylindrical vessel, the inner vessel, and the ribs, cutting them into a desired length, grinding an outer circumferential surface of the outer cylindrical vessel and an inner circumferential surface of the hollow portion to have a desired precision to complete the roller member, and fitting the processed rotating shaft into the hollow portion by applying a pressure to the processed rotating shaft and the hollow portion.
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