| 摘要 |
PURPOSE:To prevent a mold from being damaged, by providing a change-over contact that can stop servo driving in the case that an abnormal value has happened between predetermined filling pressures and a pressure detector provided to a pipeline on the input side of a pressure oil of an injection cylinder. CONSTITUTION:A screw 1 of an injection molder is moved in divisions divided by A1-A3 at rates V1-V4 set respectively by rate setting apparatuses 10-13. The reference numerals 14-16 denote pressure setting apparatuses that can set injection pressures during the filling step. The reference numeral 18 indicates a pressure detector that is located in a pipeline on the input side of a hydraulic oil of an injection cylinder 2 and detects the injection pressure. Using these apparatuses, the pressure value detected by the pressure detector 18 and P1-P3 set by the pressure setting apparatuses are compared, and if the detected pressure value exceeds the set values P1-P3, immediately a circuit change-over contact 22 located in a driving circuit is turned off via a servo-driver 21 to stop the servo driving. By this stopping, the mold would not be under excessive load and would not be damaged. |
