| 摘要 |
PURPOSE:To perform injection control while confirming the opening and closing stats of the check valve in a heating cylinder, by mounting a means for transmitting the change of the position caused by the opening and closing of the check valve to the outside and the position detection means of a screw rear part for detecting the positional change transmitted by said transmission means. CONSTITUTION:Proximity switches 27, 28 move so as to advance and retract along with a screw 12 through a back plate 20. A drawing shows such a state that a check valve 14, opened until the screw 12 advances after the completion of weighing, retracts by the pressure of a resin and the advance of the screw 12 to be closed. With the retraction movement of the check valve 14, a ring member 24 also moves so as to retract to the position of the proximity switch 28 from the position of the proximity switch 27 and, when the proximity switch 28 is turned ON, the opening of the valve is confirmed and, at the same time, the position of the screw at that point of time is set to an injection start point to perform injection control.
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