Patent ID: 8384969

Claim:
A transmission device adapted for individually driving an automatic document feeder and a scanner, the transmission device comprising: a first transmission shaft; an actuator movably attached around the first transmission shaft; a first transmission module coupled to the scanner; a second transmission module coupled to the automatic document feeder; and a power switching module assembled to the first transmission shaft, the power switching module coupled to the first transmission module to drive the scanner, the power switching module coupled to the second transmission module to drive the automatic document feeder, wherein when the power switching module is coupled to the first transmission module and the first transmission shaft rotates in a first direction such that the scanner moves toward the transmission device to a first position, the scanner drives the actuator to drive the power switching module to be coupled to the second transmission module, when the first transmission shaft rotates in a second direction opposite to the first direction, the power switching module is coupled to the first transmission module and drives the scanner to move away from the transmission device.