| 摘要 |
PROBLEM TO BE SOLVED: To actually measure the fluid state of a material in a cavity and facilitate the execution of the measurement. SOLUTION: Three sensing means are provided in an ejector pin 24 (24a), which pushes out an molded item from a cavity of a molding die B separated after the item is molded. The sensing means, in the form of bar, exhibits its forward end on the forward end surface of the pin 24 (24a) and is provided so as to be axially slidable. And the means is comprised of a bar-shaped part 36, to the forward end of which the pressure of a material flowing in the cavity is applied, a deflecting part 37 which is fixed to the proximal end of the part 36 and elastically deflected by a load applied to the part 36, and a deflection sensing element 38 to sense a deflection generated in the part 37. The three means are disposed along the inner wall surface of the cavity so as to be equidistantly spaced apart one from another at the forward end of the pin 24 (24a). And the fluid state, such as flow direction, velocity, pressure, is grasped from the location of each means in the cavity and the difference of time of passage of material sensed by each sensing means.
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