Image forming apparatus

An image-forming apparatus includes: a photosensitive drum, a motor, and a drum gear train configured to transmit a driving force from the motor to the photosensitive drum. The drum gear train includes a first gear, a second gear and a first clutch. The first gear is rotatable about a first axis upon receipt of the driving force. The second gear is rotatable about the first axis and configured to receive the driving force from the first gear and to transmit the driving force to the photosensitive drum. The first clutch is switchable between a first transmission state where the driving force is transmitted from the first gear to the second gear and a first transmission cutoff state where the transmission of the driving force from the first gear to the second gear is cut off. 一种图像形成设备，包括：感光鼓，马达和鼓齿轮系，该鼓齿轮系被构造成将驱动力从马达传递至感光鼓。鼓齿轮系包括第一齿轮，第二齿轮和第一离合器。第一齿轮在接收到驱动力时可绕第一轴线旋转。第二齿轮可绕第一轴线旋转，并且被构造成接收来自第一齿轮的驱动力并将驱动力传递至感光鼓。第一离合器可在驱动力从第一齿轮传递至第二齿轮的第一传递状态与从第一齿轮至第二齿轮的驱动力的传递被切断的第一传递切断状态之间切换。