| 摘要 |
PURPOSE:To prevent short shot from occurring and flashes from generating by controlling the actual molding pressure in a cavity by a structure wherein a molding pressure detector, a first and a second pressure setting parts, a first and a second comparing parts and clockwork parts are provided. CONSTITUTION:Reference pressure are respectively set at a first and a second pressure setting parts 20 and 30. Molten resin, which is fed to a screw 2 and heated by a heating cylinder 1, is injected in a cavity 8 with an injection cylinder 3 driven by a driving device 4. When molding pressure, which is detected by a molding pressure detector and outputted to a first and a second comparing parts, reaches the set reference pressures, timer circuits 61 and 66, at both of which the predetermined periods of time are set, are counted and, after the predetermined periods of time, the injection of the molten resin is completed. If the detected molding pressure does not reach the reference pressure set at the second pressure setting part, a relay in a controlling circuit 75 is brought into actuation after the elapse of the predetermined period of time at a clockwork part and a 'defective injection' alarm lamp is lit. |
