Feeding device for a tool slide of a machine tool

A feeding device for a tool slide of a machine tool including an electro-hydraulic amplifier having a cylinder housing, in which a piston is guided with a piston collar for longitudinal movement, said piston being provided with an axial channel and a hollow piston rod penetrating an end wall of the cylinder housing and having a free end portion outside said cylinder housing, an electromotor with a housing and a rotatable drive shaft, said housing being fixed to the free end portion of the piston rod, said cylinder housing having a first cylinder chamber between said end wall and said piston collar, a second cylinder chamber adjacent the side of the piston collar remote from the first cylinder chamber and a third cylinder chamber on the side of the second cylinder chamber remote from the piston collar, control valve means comprising a valve housing and a valve member in said valve housing, said control valve means being fixedly disposed in said third cylinder chamber, a threaded spindle extending through the hollow piston rod and the axial channel of said piston, said spindle being connected to the drive shaft of said electromotor and in operative connection with said valve member.