Patent ID: 8238795

Claim:
An image forming apparatus for forming a color image on a recording material comprising: (i) a plurality of process cartridges, each of which includes a photosensitive drum and a developing roller that develops an electrostatic latent image formed on 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 driving source; (iii) a first clutch that connects and disconnects said driving source and the developing roller of the black process cartridge, and that selects driving force transmission to the developing roller of the black process cartridge; (iv) a second clutch that connects and disconnects said driving source and the developing roller of the non-black process cartridge, and that selects driving force transmission to the developing roller of the non-black process cartridge; (v) a movable first member, actable on said first clutch, that switches between an operation state for transmitting a driving force from said driving source to the developing roller of the black process cartridge and a non-operation state of not transmitting the driving force thereto; (vi) a movable second member, actable on said second clutch, that switches between an operation state for transmitting the driving force to the developing roller of the non-black process cartridge and a non-operation state of not transmitting the driving force thereto; and (vii) a switching member, actable on said first member and said second member, that switches among (a) the operating states of said first clutch and said second clutch, (b) the non-operating states of said first clutch and said second clutch, and (c) the operating state of said first clutch and the non-operating state of said second clutch, wherein said switching member includes a first portion that contacts said first member to move said first member, said first portion being rotatable, and a second portion that contacts said second member to move said second member, said second portion being rotatable, and wherein said first portion and said second portion are rotatable only in a predetermined direction.