Patent ID: 6443722
Filing Date: 2002-09-03
Classification: B29C

Abstract:
An electric injection assembly for injection presses for plastic material, comprising a plasticating screw (5) that performs a translational feed movement during injection of plastic material into a mould cavity and a rotary movement around its own axis and a rotary translational movement of rotation around its own axis and retraction during plasticating stage of the plastic material and two electric motors (32A, 32B) acting on drive means able to impart said translational, rotary and rotary translational movements to the plasticating screw (5), characterized in that the said drive means for the plasticating screw is a drive screw (30) comprising two sections (30A, 30B) with threads having a helix in opposite directions, each of said sections engaging in respective screw nuts (31A, 31B) driven in rotation by means of said electric motors (32A, 32B).