| 摘要 |
PURPOSE:To control servomotors efficiently and economically by a method wherein multistage rolls for taking up a molten and extruded resin sheet are driven respectively by individual DC servomotors to supply electric power from a common DC power source to these servo-units. CONSTITUTION:In units for taking up a molten and extruded sheet 10 continuously to which an intended tension is given by multistage rolls 12, 14, 16 and take-up rolls 18, 20, having polishing mechanisms and which is cooled gradually, each roller 12-18 is driven respectively by individual servo-motors and those corresponding DC servo-motor control circuits MC12-MC18 so that revolutional speed can be controlled to supply electric power from a common DC power source to servo-units SU12-SU18 for controlling each servo-motor. |
