Abstract: An improved injection moulding machine comprising a fixed mould clamping assembly and injection assembly having novel support means for positively and accurately raising and lowering the injection assembly. Means are provided for vertically raising and lowering the injection assembly relative to the mould clamping assembly whereby the mould clamping assembly is maintained in parallel horizontal alignment with the injection assembly. The support means comprise a pair of vertical support rods adapted for vertical adjustment secured to a pair of parallel tie bars at substantially the center of gravity of the injection assembly and means for raising and lowering the vertical rods in unison for adjusting the height of the injection assembly. Connecting means are provided to secure the ends of the tie bars adjacent the mould clamping assembly.