Abstract: A gear teeth forming apparatus is used for forming a plurality of gear teeth on an outer circumferential wall of a pressed drum. The apparatus includes a punch and a plurality of rotational rollers. A plurality of convex/concave portions are formed in the axial direction on the punch. The punch has an outer circumferential surface on which the outer circumferential wall of the pressed drum is fitted. Also, the punch is movable in the axial direction. A plurality of the rotational rollers are insertable partially into grooves of the punch and are rotatable along the grooves.

Abstract: A configuration is provided for a pair of sheet-feeding registration rollers, a transfer device, and an image-forming photo-sensitive drum in an image reproducing apparatus particularly of the clamshell-type construction. The transfer device has a sheet-charging discharge wire for transferring a toner-developed image on the photo-sensitive drum to a copy sheet. A case for the transfer device includes a synthetic-resin housing which retains the discharge wire and is fitted into a shield frame. The shield frame is configured together with at least one bracing spring to constitute a positioning mechanism for maintaining a predetermined parallel spacing lengthwise between the discharge wire and the cylindrical surface of the photo-sensitive drum, the positioning mechanism therein elastically abutting specially formed lengthwise ends of the shield frame against either of lower ends of a housing containing the photo-sensitive drum.