Drive unit

A drive unit configured to drive an output unit, the drive unit comprising:

• an electric motor configured to be forwardly and reversely rotated;
• a first gear train including a first drive gear, a first driven gear, and a clutch member, the first drive gear configured to receive a torque transmitted thereto from the electric motor, the first driven gear having a tubular shape, the first driven gear configured to receive the torque transmitted thereto from the first drive gear, the clutch member disposed to be axially movable inside the first driven gear, the clutch member configured to receive the torque transmitted thereto from the first driven gear;
• a second gear train including a second drive gear, the second gear train configured to transmit to the output unit the torque transmitted thereto from the first gear train;
• a third gear train including a third drive gear, the third gear train configured to transmit to the output unit the torque transmitted thereto from the first gear train;
• and
• a moving mechanism configured to axially move the clutch member toward the second drive gear such that the clutch member is engaged with the second drive gear when the electric motor is forwardly rotated, the moving mechanism being configured to axially move the clutch member toward the third drive gear such that the clutch member is engaged with the third drive gear when the electric motor is reversely rotated.