Patent ID: 6835057
Filing Date: 2004-12-28
Classification: B29C

Abstract:
An injection unit for an injection molding machine for processing thermoplastic material, said molding machine having a screw guided in a cylinder, comprisinga first motor coupled to said screw for axially moving said screw in said cylinder for injecting said thermoplastic material, wherein its axial motion is driven by a spindle coupled with a spindle nut, said spindle nut being directly driven by said first motor, and a second motor coupled to said screw by a gear mechanism for rotating said screw for preparing said thermoplastic material for injection, said gear mechanism reducing the rotational speed of said screw relative to said second motor to a speed appropriate for the preparation of said material for injection, wherein the two motors, gear mechanism and spindle nut, apart from rotatary motion, are stationary, and the spindle is rotatably and displaceably arranged between the spindle nut and the screw.