| 摘要 |
An image forming apparatus includes a plurality of cartridges for supplying developers, the cartridges being detachably mountable to a main assembly of the apparatus; a plurality of first doors, provided correspondingly to cartridges, respectively, for opening and closing inserting openings for permitting insertion of the cartridges into the main assembly, independently from each other; a remaining amount detecting device for detecting information relating to an amount of the developer contained in the cartridges; a locking device for locking the first doors; a controller for controlling the locking device, on the basis of a result of detection of the remaining amount detecting device, to unlock only the first door corresponding to the cartridge to be exchanged; a moving mechanism for moving the first door from a position closing to an opening position with the unlocking of the locking device; and a second door movable between a closing position for preventing access to the first doors and an opening position for permitting access to the first doors; an opening and closing detecting device for detecting opening and closing of the second door; wherein the controller unlocks the first door on the basis of the results of detection of the opening and closing detecting device and the remaining amount detecting device.
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