The working principle of the pneumatic clamping system driven by a three-angle effect mechanism and a non-pole cylinder is introduced. The calculating formulae of force amplifying coefficient and output force are provided in this paper too. The structure of this three-step force amplifier device is very compact and simple. It can reduce the diameter of the cylinder, if we put it together with Pneumatic Clamping Device. Furthermore, if the diameter of the cylinder is determined, it can improve the output for...