Patent ID: 8050594

Claim:
An image forming apparatus comprising: a photoconductive drum including a conductive cylindrical member and a photoconductive layer on an outer circumferential surface of the cylindrical member; a transfer roller including a conductive shaft member that has an axis parallel to an axis of the cylindrical member of the photoconductive drum, and a contact charging member that is provided in an outward direction of the shaft member to transfer a developer image onto a recording medium; a conductive drum flange that is provided at one end of the cylindrical member of the photoconductive drum, and on an outer circumferential surface of which plural first gear teeth are formed; a driving unit that drives to rotate the drum flange; and a nonconductive gear member that is provided in the shaft member of the transfer roller to be opposed to the drum flange and has an outer circumferential surface on which plural second gear teeth, to which driving force is transmitted from the plural first gear teeth of the drum flange, are formed, a bearing surface that rotatably supports the shaft member, and two sides orthogonal to an axial direction of the shaft member and on at least one side of which a groove is formed.