A device for processing a workpiece which, for this purpose, is fixed inside a working space in a machining center and is processed with the aid of a tool. When the flexible screen is pulled out and entirely exposed outside of the casing, the entire flexible screen can be used for image-displaying. Each sliding cable fastening block can be slid in or out from the receiving slot for conveniently installing a large cable. When the force is initially applied to the cushioning device, the cushioning device is deformed to conform to the physical object from its original shape.