Automatic cake discharging is realized by the plate shifter on the both side-beams. This is the key different between semi-automatic filter press with automatic filter press. After filtering process is finished, the moving end plate is in fully open position, the PLC is designed to operate plate shifter to do reciprocating motion. The Plate Shifting Device shifts individual plates (For fast open system, it will be a group of plate pack) driven by the motor with necessary chain and sprocket design. Necessary controls for speed and pressure are incorporated in the power pack unit.