IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To reduce the number of component items, to reduce a cost, and also to satisfy high accuracy required for a distance between an image carrier and a developing roll. SOLUTION: The distance S between the developing roll 50 and the photoreceptor drum 12 is determined by bringing the curved surface 60A of a photoreceptor drum supporting member 60 in contact with a developer roll bearing 52. That is, the distance S is determined by the developing roll bearing 52 and the photoreceptor drum supporting member 60, then, the number of components is reduced. Consequently, the material cost and the man-hour for assembling are reduced, then, the cost reduction is attained. Besides, there are fewer accumulated tolerances by component tolerances of respective components, and also, fewer assembling errors, then, the high accuracy required for the distance S is satisfied. When the distance S becomes narrow owing to the wear of the curved surface 60A of the photoreceptor drum supporting member 60 due to a secular change, the photoreceptor drum supporting member 60 is rotated to change a contact position of the curved surface 60A with the developing roll bearing 52. The newly abutting curved surface 60A of the photoreceptor drum supporting member 60 is not worn, then, the distance S is recovered. COPYRIGHT: (C)2006,JPO&NCIPI