MATRIX DEVCE FOR INJECTION MOULDING

摘要

PURPOSE: To provide the subject apparatus simple to produce, low in cost and capable of ensuring the dimensional accuracy and stability of a molded product at the same time by freely connecting a holding means to a vacuum source in order to hold a core to a wall surface by at least vacuum sucking action. CONSTITUTION: The rotary power generated by rotating the rotary shaft 11 connected to an external power supply is transmitted to a bush 9 through a helical gear device to draw in a holder 7 in the direction shown by an arrow 13 with respect to the bush 9. The holder 7 is housed in a recessed place 14 and a flange 10 presses a disc 5 to the front 4 from the outside. The flange 10 cooperates with the front 4 to hold the rim in the center hole 6 of a disc 5 in a center hole 6 to hold the disc 5 to a rear mold 3. The floating of the outer peripheral part of the disc 5 can be perfectly prevented by connecting the ring-shaped groove 18 formed to the front 4 to a suction pipe 21 through a suction passage 19 and a ring-shaped gap to suck the same under vacuum.