The traditional ordinary ROUND STUD RUBBER SHEET no on the machine drive motor adjustment, that is, as long as the machine electricity, motor is always the rated speed operation. ROUND STUD RUBBER SHEET because of motor and oil pump coaxial, oil pump will be rated production will oil inhaled in hydraulic system, when ROUND STUD RUBBER SHEET system needs to be provided by the flow of oil pump the flow of less than, the excess oil will be backflow, this will enormous waste.