Patent ID: 8655230
Filing Date: 2014-02-18
Classification: G03G

Abstract:
1. An image forming apparatus for forming a color image on a recording material, said image forming apparatus comprising: (i) a plurality of processing cartridges, each of which includes a photosensitive drum, a developing roller that develops an electrostatic latent image formed on the photosensitive drum, a first frame that rotatably supports the photosensitive drum, and a second frame that rotatably supports the developing roller, the second frame being movable relative to the first frame to contact the developing roller to the photosensitive drum and to space the developing roller from the photosensitive drum, the process cartridges including a black process cartridge containing a black developer and a non-black process cartridge containing a non-black developer; (ii) a motor; (iii) a first movable member that acts on the second frame of the black process cartridge and is capable of providing (a) an operation state to contact the photosensitive drum and the developing roller to each other and (b) a non-operation state in which the photosensitive drum and the developing roller are spaced from each other; (iv) a second movable member that acts on the second frame of the non-black process cartridge and is capable of providing (a) an operation state to contact the photosensitive drum and the developing roller to each other and (b) a non-operation state in which the photosensitive drum and the developing roller are spaced from each other; and (v) a switching unit that is actable on said first movable member and said second movable member, and switches between (a) the operation states of the black process cartridge and the non-black process cartridge and (b) the non-operation states of the black process cartridge and the non-black process cartridge, wherein, when said switching unit moves said first movable member and said second movable member by a driving force from said motor, said motor rotates unidirectionally in a predetermined direction.