. . "In this embodiment, the peripheral surface of the development roller 18 has been simply coated with carbon. [0128] The longitudinal ends of the development roller 18 are fitted with a sleeve flange 18 a (one at one of the longitudinal ends is shown), which is a cylindrical member with a step portion, formed of metallic material such as aluminum or stainless steel, and is pressed into the end of th" . . .