| 摘要 |
A color image forming apparatus for forming a color image on a sheet includes a plurality of cartridge mounting portions for demountably mounting a cartridge each of which includes a developing roller for developing an electrostatic latent image formed on a photosensitive drum into a developed image and a developer accommodating portion for accommodating a developer to be used for development of the electrostatic latent image; a single intermediary transfer member which is provided opposed to the drums and onto which the developed images are transferred from the drums; an image forming unit containing the cartridge mounting portions and the intermediary transfer member and movable between a first position for transferring, onto the sheet, the developed images transferred onto the intermediary transfer member from the drums and a second position for permitting mounting and demounting of the cartridges relative to the cartridge mounting portion; an opening for permitting mounting and demounting of the cartridges relative to the cartridge mounting portions of the unit taking the a second position; and an opening-closing member movable between a closing position for closing the opening and an open position for opening the opening, wherein when the unit takes the first position, the cartridges take attitudes in which the developer is supplied to the developing roller by the weight thereof, and when the unit takes the a second position, the cartridges take attitudes in which the developer is not supplied to the developing roller by the weight thereof.
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