Injection molding machine

Claim 1

An injection molding machine, comprising: a valve holding member provided with a first passageway for introducing a first resin material from a first injection cylinder and a second passageway for introducing a second resin material from a second injection cylinder; a valve rotatably held in a mating hole provided in said valve holding member, said valve assuming a substantially cylindrical shape and provided with a cut-away portion at the axially central position thereof; a mold having a space for molding an article into which said resin materials are poured; and a member having a pouring gate for pouring said first and second resin materials into said space; said valve being constructed such that it is stopped at a first position and a second position by the rotational movement thereof, that in said first position, it pours the first resin material from said first injection cylinder into said space of said mold through said first passageway, said cut-away portion and said pouring gate, and that in said second position, it pours the second resin material from said second injection cylinder into said space of said mold through said second passageway, said cut-away portion and said pouring gate, wherein the central portion of said valve is of a cylindrical shape, the opposite ends of said cylindrical shape assume a frusto-conical shape, and gaps for shearing leaked resin are provided between the frusto-conical portions of said valve and the inner surface of said mating hole of said valve holding member.