Patent ID: 8903282
Filing Date: 2014-12-02
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a drive source; a first photosensitive member on which an electrostatic latent image is to be formed; a first developing roller configured to supply developer to the first photosensitive member; a first urging member configured to urge the first developing roller toward the first photosensitive member; a translation cam configured to be moved in a predetermined direction upon receipt of a drive force from the drive source and to move the first developing roller between a first contact position contacting the first photosensitive member and a first retracted position retracted from the first photosensitive member; and an adjacent member which includes a first engaging portion and which is adjacent to the translation cam, wherein the translation cam has a first cam surface configured to move the first developing roller from the first contact position to the first retracted position and a first holding surface configured to hold the first developing roller at the first retracted position, and the translation cam includes a second engaging portion engageable, in the predetermined direction, with the first engaging portion, and wherein the first engaging portion and the second engaging portion are positioned such that the first engaging portion and the second engaging portion engage each other before a surface to receive an urging force from the first urging member is switched from the first holding surface to the first cam surface, and are configured such that one of the first engaging portion and the second engaging portion does not climb over the other one of the first engaging portion and the second engaging portion when a force smaller than the drive force from the drive source is applied to the translation cam, and the one of the first engaging portion and the second engaging portion climbs over the other one of the first engaging portion and the second engaging portion when a force equal to or larger than the drive force from the drive source is applied to the translation cam.