| 摘要 |
A wrong insertion preventing mechanism of simple construction is realized without requiring any sensor for discriminating the incompatibility of a process cartridge to the main body of an image forming apparatus. When an improper cartridge which does not match in function with the main body of the apparatus is wrongly inserted, a cam portion for opening and closing a shutter comes into engagement with a wrong insertion preventing engagement portion in the opening portion of the main body of the apparatus and the shutter is opened, whereby the wrong insertion of the cartridge is blocked. In the case of a proper cartridge, it is inserted without the shutter being opened in the opening portion of the main body of the apparatus, and with the operation of closing an openable and closable member, the cartridge is inserted into the inner part of the main body of the apparatus together with a moving guide and the shutter is opened at a proper position.
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