Patent ID: 8862022

Claim:
An image forming apparatus for forming an image on a recording material, comprising: an image forming unit configured to form an image on a recording material, said image forming unit including a main assembly; a supporting member, to be received in said main assembly for supporting a plurality of cartridges, wherein said supporting member is movable to an outside position to which said supporting member is capable of being pulled out of said main assembly of said image forming unit and where the cartridges are detachably mountable to said supporting member, a first inside position where the cartridges are positioned inside of the main assembly, and a second inside position where said supporting member is movable to the outside position and the first inside position inside of said main assembly; a first positioning portion, provided in said main assembly, for positioning an associated cartridge of the cartridges when said supporting member is located at the first inside position, and a first preventing portion, provided in said main assembly, for preventing rotation of the associated cartridge about said first positioning portion; and a second positioning portion, provided in said supporting member, for positioning the associated cartridge when said supporting member is located between the outside position and the second inside position, wherein said second positioning portion is spaced from the associated cartridge, when said supporting member is located at the first inside position.