IMAGE-FORMING APPARATUS

PROBLEM TO BE SOLVED: To prevent an image-forming unit from being separated from a positioning hole in rotation of an idler gear. SOLUTION: The image-forming apparatus includes: an image-forming unit SY including a photoreceptor drum 10, a developing roller 12-2, and an idler gear 12-1a; a positioning hole 30a that contacts a shaft part 10a of the photoreceptor drum 10 at two points to perform positioning; and a bracket 30 having a support hole 30b that movably supports a rotating shaft 12-1aa of the idler gear 12-1a in the direction of approaching to or separating from the positioning hole 30a. When force F, which a rotational shaft 12-1aa receives when the idler gear 12-1a is driven, is divided into a first component force F1 and a second component force F2, the direction of the first component force F1 is a direction in which the contact force of the positioning hole 30a and shaft part 10a is increased. COPYRIGHT: (C)2011,JPO&INPIT