A lower mold attachment plate, on the upper sur-face of which the fixed mold half is attached, isfixed to a machine base. An upper mold attachmentplate, to which the movable mold half is attached inopposite to the fixed mold half, is movable upwardlyand downwardly by mold moving cylinders. A rotarydisc, which has plural injection cylinder insertionholes in the same circle in vertical alignment withplural injection cylinder insertion holes of theupper mold attachment plate, is rotatably pivoted onthe upper surface of the upper mold attachment plate.Plural injection units arranged over the rotary discin predetermined distances along the circle are joinedwith the rotary disc as a unit. As the rotary disc isrotated to a divided angular position, a slidefastener chain is conveyed along the extension of thechain travelling path, by a predetermined length atevery injection molding by means of chain conveyer.
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