Patent ID: 7577382

Claim:
An image forming apparatus comprising: a process unit being attachable to and detachable from the image forming apparatus and including a developing roller for supplying a developer to a photosensitive member; a driving source that generates a rotation driving force; a first driving unit that rotates when the rotation driving force generated by the driving source is transmitted; and a connection switching unit that switches between a transmission state in which the rotation driving force generated by the driving source is transmitted to the first driving unit and a non-transmission state in which the rotation driving force generated by the driving source is not transmitted to the first driving unit, wherein the process unit includes: a transmission permission unit that switches a state of the connection switching unit into the transmission state, when the process unit exists at a process mounting location with respect to the image forming apparatus; and a second driving unit that couples with the first driving unit when the process unit exists at the process mounting location and rotates a rotation driving subject in the process unit by a rotation force of the first driving unit.