Patent ID: 6193499
Filing Date: 2001-02-27
Classification: B29C

Abstract:
Injection apparatus for an injection molding machine, said apparatus comprising:a. a plastication unit including a plastication barrel and a helical screw rotatably carried within the plastication barrel for plasticating molding material;b. an accumulator barrel spaced from and in communication with the plastication barrel for receiving plasticated molding material and including a plunger slidably and rotatably carried within the accumulator barrel, the accumulator barrel having an inner diameter and a forward end through which molding material is injected and having a rearward end through which the plunger extends, the plunger having a head at its forward end within the accumulator barrel and having an elongated shaft extending rearwardly from the head and out the rearward end of the accumulator barrel;c. electrically-powered plunger drive means connected with the plunger shaft for translating and rotating the plunger within and relative to the accumulator barrel; andd. a support bushing carried at the rearward end of the accumulator barrel, the bushing having a central opening surrounding and engaging the plunger shaft to provide support for the plunger as it slides within the accumulator barrel.