A dial is provided to a laser printer such that only a portion of the dial is exposed in an accommodating area for accommodating a process cartridge. A user can manually rotate a conveying roller to convey a paper through a conveying path by operating the dial. The dial is disposed coaxial with an auger. The auger operates in association with the conveying roller because of an auger gear being engaged with a conveying gear. A driving force from a driving motor is transmitted to the conveying gear via a planetary gear. When a paper jam occurs, the user operates the dial in order to move the planetary gear, thereby switching the state for communicating the driving force from the drive motor to the conveying roller from a communicating state to a non-communicating state.