Injection assembly for an injection molding machine
AssigneeKrauss-Maffei Aktiengesellschaft
InventorHerbert Pickel
Life of this patent
Estimating the term…
Abstract
The extruder screw drive has a first and a second motor, a screw mechanism connected to the first motor and to the extruder screw for translating it in the extrusion cylinder, and a slide mechanism connected to the second motor and to the extruder screw for rotating it in the extrusion cylinder. The screw mechanism and the slide mechanism are coaxial and partially fit into one another to provide an axially compact arrangement. The motors can be hollow shaft electric motors axially aligned together, and pressure regulated hydraulic axial force can be added to the extruder screw during plasticating as it retracts due to increased volume of plastic at an output end of the extrusion cylinder.
Claims18
An injection assembly for an injection molding machine for processing of thermoplastic material, comprising:
- an extruder screw cylinder;
- an extruder screw rotatable and axially shiftable in said cylinder;
- and
- an extruder screw drive connected to said extruder screw, said extruder screw having two electric motors, one of said motors being operatively connected to said extruder screw for turning the extruder screw and another of said motors being operatively connected to said extruder screw for axial movement of the extruder screw, both of said electric motors being mounted with their axes aligned with an axis of the extruder screw and at least one said motors being a hollow shaft motor, both said motors being hollow shaft motors, said motors being in the form of disks next to one another.
An injection assembly for an injection molding machine for processing of thermoplastic material, comprising:
- an extruder screw cylinder;
- an extruder screw rotatable and axially shiftable in said cylinder;
- and
- an extruder screw drive connected to said extruder screw, said extruder screw having two electric motors, one of said motors being operatively connected to said extruder screw for turning the extruder screw and another of said motors being operatively connected to said extruder screw for axial movement of the extruder screw, both of said electric motors being mounted with their axes aligned with an axis of the extruder screw and at least one said motors being a hollow shaft motor, at least one of said two motors being speed controllable.
An extruder screw drive apparatus for a screw plasticating injection molding machine having an extruder screw rotatable and slideable in an extrusion screw cylinder, said apparatus comprising:
- a first and a second motor;
- screw means connected to said first motor and to said extruder screw for translating said extruder screw in said cylinder;
- and
- slide means connected to said second motor and to said extruder screw for rotating said extruder screw in said cylinder, said screw means and said slide means being coaxial, said screw means and said slide means fitting partially into one another, whereby an axially compact arrangement is provided.
Dependencies are inferred from the claim text.