One of the typical applications of screw mechanisms is the effort-saving devices. And the screw presses are a representative application of effort-saving devices. The fundamental principle of the screw presses is, via the screw motion, to convert a small input torque as an extremely large output force. For the shown design, this screw press is constructed with a screw and a frame. On the lower end of the screw, a press plate is attached to the screw and the workpiece can be placed under the press plate to wait for pressing. When a torque is inputted into the screw, the screw will output a translational motion, which forces the press plate pressing the workpiece in a very large force.