cartridge includes a photosensitive drum in which the transferred contents are formed, and various types of means for operating on the photosensitive drum so as to form the contents to be transferred are collectively arranged in the process cartridge. As examples thereof, means for performing photographic developing, electrification, and cleaning can be exemplified.
The same process cartridge is attached to and detached from the apparatus body for maintenance or the old process cartridge is detached from the apparatus body so as to be replaced with a new process cartridge to be mounted in the apparatus body. A user of the image forming apparatus individually performs such attachment and detachment of the process cartridge. Therefore, from a viewpoint thereof, it is desirable that attachment and detachment of the process cartridgeand when the cover is in an open state, a movement for detachment is performed so as to prevent the drive force from being transmitted to the photosensitive drum. Accordingly, the process cartridge can be attached to and detached from the apparatus body in the direction different from the axial line direction of the drive shaft.
In addition, there is a technology in which the photosensitive drum is provided with a gear, and the gear is caused to mesh with another gear which is driven by the apparatus body, thereby rotating the photosensitive drum.
JP-A-2008-233868 as Patent Document 2 discloses an invention in which the drive shaft of the apparatus body engages with a photosensitive drum unit through a rotary power transmission component having a trunnion structure attached to the