Injection assembly for an injection molding machine
US5540495A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/5048
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.