Drive transmission device, drive unit, and image forming apparatus

A drive transmission device comprising:

• a drive train including a plurality of drive transmitters configured to transmit a driving force of a drive source to a rotator rotatable around a shaft and a swing member rotatable around a shaft different from the shaft of the rotator;
• and
• a container that contains the drive train,
• wherein:
• the rotator is a roller,
• the swing member is a switching claw,
• the drive transmitters include two outputs to drive the roller and the switching claw, respectively,
• a rotation of the roller has a higher resistive force on the drive train then a rotation of the switching claw,
• when the switching claw is not restricted from moving, the drive source rotates the switching claw,
• when the switching claw is restricted from moving, the drive source rotates the roller.