Abstract: A jam preventing drive device for a facsimile suitable for removing instability of document relay and for preventing document jam. The drive device has a drive motor, main transmission gears for rotating both a document separation roller and a guide roller during initial rotation of the motor, and for rotating a register roller during reverse rotation of the motor. Auxiliary transmission mechanism transmit the rotating force of the register roller to the document separation roller during the reverse rotation of the motor. In the drive device, the rotating force of the motor is transmitted to both the document separation roller and the guide roller during the initial rotation of the motor, while the rotating force of the motor is transmitted to both the register roller and the document separation roller during the reverse rotation of the motor.