Abstract: A dual-directional pipe-bending machine bends a pipe in either direction and has a base, a transporting device and a pipe-bending assembly. The base has a bracket. The transporting device is mounted slidably on the bracket. The pipe is mounted on the transporting device. The pipe-bending assembly is mounted on the base and has a transversely moving bracket, a vertically moving bracket, a location-changing assembly, a rotating transmission device, a rotating bracket and two pipe-bending devices. The transversely and vertically moving brackets are mounted on the base. The location-changing assembly moves the transversely moving bracket and the vertically moving bracket. The rotating bracket connects to the vertically moving bracket. The rotating transmission device rotates the rotating bracket. The two pipe-bending devices are mounted on the rotating bracket.

Abstract: A transmission device for a tube bending machine include a first power means and a second power means mounted on the sliding seat to drive the sliding seat as well as a workpiece securely connected to the sliding seat to move. The second means has a second motor alternately connected to the clutch so that the transmission power is selectively transmitted to drive the sliding seat when required. Therefore, transmission of workpiece is smooth and the processing work to the workpiece is accomplished.