Abstract: An instantaneous clamping/unclamping mechanism for a CNC machine tools is provided. The two stage procedure tool separating function includes an oil cylinder with a piston rod passing through its inner part and engaged with a first piston for tool separating therein and a second piston for tool presetting installed at the bottom of the first piston and formed in slidable relation with the piston rod. The space in the oil cylinder is therefore separated by the two pistons into upper, middle and lower three oil flowing chambers. Further, an adjusting screw is provided at the bottom of the piston rod and is connected with the tool pot. Two mechanism valves are provided for controlling the direction of oil flow for operating the piston rod to perform two stage procedures of tool separation. The position of the two valves is controlled by a valve position changeover mechanism.

Abstract: Disclosed herein is a clamping and positioning mechanism for the inclined axis of two-axes rotary tables comprising an annular recessed slot formed along the outer surface of a stationary supporting frame. In this slot, there is installed a piston with a large cross sectional area and a plurality of connecting rods are in connection with the piston. These connecting rods are penetrated through corresponding plurality of respective through holes which are bored through the stationary supporting frame, and are extended until the surface of an axle bush of the inclined axis. There are plurality of double diameter holes opened on the axle bush so as to accept a plurality of double diameter brake members passing through those corresponding double diameter holes and screw combine with the extended ends of the connecting rods respectively. A spring is provided to regularly and elastically pressing against the piston such that the double diameter brake members are under relaxed position.