| 摘要 |
PURPOSE:To enable the titled machine to hold constantly a quantity of molten resin every shot whatever variation a position of a screw directly before injection may be made, by performing changeover of an injection speed or injection pressure or changeover to a dwell process on a casting quantity of the molten resin while an actual quantity of the molten resin cast within a mold after beginning to the injection is being detected. CONSTITUTION:A moving speed f (v) of a screw 2 is converted into voltage by a speed-voltage converter 5, with a value of which time integration is begun by an integrator 7 through a signal made by an integration beginning trigger transmitter 6 along with beginning of injection. Simultaneously with the above matter an integrated value is compared with a value predetermined by a reference value setting-up device 8 beforehand by a comparator 9 and a signal 10 is made when both are coincident with each other. Not only the whole stroke of an injection process of the screw but also each stroke of each process whose speed has been changed over are coincident respectively with the predetermined value and a quantity of injection becomes constant irrespective of a deflection between a screw position directly before the injection process and a predetermined value of the retreated most position of the screw by performing changeover to an injection speed or injection pressure or a dwel pressure, which is one of injection process control, with the signal 10. |
