Apparatus for injection molding

A sprue bar assembly for conducting melt to mold cavities, the mold cavities being defined by plural pairs of mating mold components, each mating mold component comprising a mold assembly, plural mold assemblies being supported so that mating mold components are simultaneously abutted and separated by movement of supports in a direction parallel to a mold longitudinal axis and the sprue bar assembly is abutted with and separated from a mating member with abutment and separation of mating mold components, the sprue bar assembly comprising a sprue bar segment, a nozzle and a length adjusting device interposed between the nozzle and the sprue bar segment, the sprue bar segment comprising a tubular body having a passage there through providing fluid communication between a source of melt and said plurality of mold cavities, the nozzle having a nozzle passage there through for conducting melt between the sprue bar assembly and a mating mold interface member engaged by the sprue bar assembly when mating mold components are abutted, a shank portion received in the passage, a nose portion for engaging a mating mold interface member when mating mold components are abutted and a flange intermediate the nose portion and the shank portion, the length adjusting device comprising a wedge member having a wedge first surface oblique to the axis of adjustment for abutting an adjustment surface, the adjustment surface being oblique to the longitudinal axis of the sprue bar assembly, a wedge second surface perpendicular to the axis of adjustment and means for setting the transverse position of the wedge member relative to the longitudinal axis of the sprue bar assembly to establish the position of the second surface relative to the adjustment surface, whereby the overall length of the sprue bar assembly is established by setting the transverse position of the wedge member relative to the longitudinal axis of the sprue bar assembly.