Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to cause relative movement between mold and charger
Patent
1997-02-25
1999-10-19
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to cause relative movement between mold and charger
B29C 4546
Patent
active
059685638
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims the priorities of the German Patent Applications 195 31 329, filed on Aug. 25, 1995 as well as 195 42 453, filed on Nov. 14, 1995, the disclosures of which are herewith also explicitly the subject matter of the present application.
TECHNICAL FIELD
The invention concerns an injection molding unit for a plastics injection molding machine for processing plastifiable materials such as synthetic materials, powdery and ceramic masses.
The invention relates to an injection molding unit for a plastics injection molding machine for processing plastifiable materials, the machine being of the type including: a plasticizing unit for supplying plastifiable material to a mold via a nozzle along an injection axis; feeding means received in the plasticizing unit; a carrier block detachably receiving the plasticizing unit; an injection bridge at which the feeding means is mounted and which is movable towards and away from the carrier block for movement of the feeding means relative to the plasticizing unit; a plurality of electromechanical drive units arranged symmetrically to the injection axis for displacement of the injection molding unit along the injection axis for attachment of the nozzle to the mold; a plurality of electromechanical injection units arranged symmetrically to the injection axis for movement of the injection bridge relative to the carrier block; and linear guiding elements along which the carrier block and the injection bridge are displaceable.
PRIOR ART
Such an injection molding unit wherein a carrier block is seated so as to be axially displaceable relative to a stationary mold carrier, is known from EP-A 576 925. The linkage between carrier block and stationary mold carrier takes place via electromechanical spindle drives nested in series, wherein these comprise a drive unit, formed as a hollow shaft motor for attachment of the nozzle to the injection mold and an injection unit, which generates the axial movement of the feed screw within the plasticizing cylinder during injection. Furthermore a rotational motor for the rotation of the feed screw is provided at an injection bridge. Guide rails on which at least the carrier block is guided, are provided at the machine base as guidance which is not effected symmetrically. Further guiding elements are not provided. The serial arrangement of the drive unit and the injection unit results in a large overall length of the injection molding unit, since the movement paths of both units are lined-up one behind the other. In case of a defect of one unit, at least one `spar` with both units has to be dismounted, causing unnecessary extra work and additional costs. The arrangement of the units in the area of the plasticizing cylinder makes the access to the plasticizing cylinder itself more difficult.
From DE-C 43 17 998 it is also known to arrange drive units for attaching the nozzle and an injection unit symmetrically to the injection axis. Electromotors serve as drives, which drive the hollow shafts of the drive unit and the injection unit, which are nested into one another, via belt drives. Also here both units can only be exchanged together and no separate guiding elements, except of the guiding strips placed loosely at the machine base, are provided.
In the area of the hydraulically driven injection molding units it is known from DE-C 37 35 419, to arrange two drive units for attachment of the nozzle to the mold and two injection units symmetrically to the injection axis on two different planes. The piston rod of the drive unit at the same time takes over a guiding function for the whole injection molding unit, so that merely due to the sealing of the hydraulic liquids in the pistons, a guiding precision is granted, which with electromechanical drives cannot be achieved in the same way. It is not sufficient; however, just to exchange the hydraulic drives with electromechanical drives in order to transfer this principle to an electromeachanically driven injection molding unit. This
REFERENCES:
patent: 2966070 (1960-12-01), Wise
patent: 4802558 (1989-02-01), Garnett
patent: 5035120 (1991-07-01), Quilliou
Heitbrink Tim
Kinberg Robert
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