an injection molding machine includes a clamping unit constructed for support of at least two molding tools to provide at least two different cavities . a first plasticizing unit is provided for charging one of the cavities in one of the molding tools , and a second plasticizing unit is provided for charging the other one of the cavities in the other one of the molding tools . the second plasticizing unit is hereby attached to a mounting in a substantially vertical orientation . the mounting may be mounted on one of the platens of the injection molding machine or on a frame which extends above the clamping unit .