Abstract: An injector mounted on a carriage having an elevator is movable along a row of conventional mold press units each having an article mold, and is movable vertically to register with a selected mold. The press units and the molds therein are separate and independent of one another. Injection parameters are preset and activated upon registry of the injector with a selected mold, independently of the mold-to-mold sequence selected. Conventional mold press units (clamps) are simply modified to cooperate with the injector. The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.