| 摘要 |
PURPOSE:To eliminate temperature drift and enhance measuring accuracy by inserting slidably a bar-shaped pressure transmitting pin in a case provided on an opening section through an injection cylinder wall surface in front of an injection plunger, and bringing one end in contact with a pressure sensing device of a pressure sensor and the other end with the resin in the injection cylinder. CONSTITUTION:A pressure submitting pin 4 is inserted slidably in a case 5 provided in an opening section 3 running through a wall surface of heating cylinder 1, with its one end in contact with a pressure sensing device of a pressure sensor 6 and the other end with the resin in a heating cylinder. The shape of the pressure submitting pin 4 should preferably have steps in order to reduce the friction resistance with the gas 5 and prevent the resin from flowing in. Actually the friction force of the pressure submitting pin 4 and the gas 5 is reduced from the pressure, which is not a problem in the actual stage, and the measuring accuracy can be enhanced. The pressure sensor 6 should preferably be mounted on a position separated from an outer wall surface of the heating cylinder 1 from the viewpoint of protecting the pressure sensor 6 from the heat of the heating cylinder 1, and air flow should preferably be sprayed to the pressure sensor 6. |
