Injection moulding machine

Details Injection moulding machine Injection moulding machine

1995-04-06

1996-09-17

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

4254501, 4254519, B29C 4564

Patent

active

055566561

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to an injection moulding machine with a machine frame, one stationary and one moveable die platen and, carried on an end plate of the machine frame, a hydraulic or electro-mechanical closing mechanism which is provided with a closing piston moveable with respect to the end plate, with which closing mechanism the moveable die platen can be displaced on guide rails provided on the machine frame, wherein the end plate upon which the moveable die is supported and the stationary die platen are connected exclusively by means of the machine frame and the die platens locked together are inclined, under the influence of the closing force, slightly out of a plane perpendicular to the machine frame, and a hinge is provided near to the closing piston which joins together a hinge part assigned to the machine frame and a hinge part assigned to the moveable die platen.
An injection moulding machine of this type is known from EP-B1-0 311 133. Injection moulding machines without transoms offer better access to the moulding tool, whereby for example the time required for dismantling can be substantially reduced. As a whole they are distinguished by free access to the tool area, the possibility of using bulky tools, by better use of the machines and by the possibility of using automatic tool changers.
It has been shown that when there is a very high degree of build-up of closing force, the stationary die platen and the end plate upon which the closing mechanism is supported are pushed apart from one another. In order that the moveable die platen can optimally match up with the stationary die platen, it not only has to perform a tilting movement, but also a movement along its vertical plane.


SUMMARY OF THE INVENTION

The object of the invention is to provide a mounting for the moveable die platen which makes it possible in a simple, cost effective manner for it to match the movement of the stationary die platen and thereby guarantees an absolutely sealed moulding tool.
The object according to the invention is solved in that when hinged, in addition to a tilting movement the hinge part belonging to the moveable die platen performs a radial displacement relative to the machine frame, preferably directed approximately normally with respect to the longitudinal axis of the machine.
By means of the embodiment according to the invention the closing force always acts normally upon the interface of the tool, whereby the absolute sealing of the tool during the injection process is ensured.
An injection moulding machine without a transom of this type can naturally be configured as a horizontal machine as well as a vertical machine.
The closing mechanism according to the invention can also be used advantageously in transfer moulding presses and moulding press machines.
Different embodiments of the invention will hereafter be described in more detail with reference to the attached drawings. The embodiments shown concern horizontal machines and injection moulding machines.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a side view of an injection moulding machine according to the invention,
FIG. 2 shows schematically and in an exaggerated manner the deflection of the longitudinal axes of the closing cylinder and the moveable mould carrying platen from the main axis of the machine during a high degree of build-up of closing force,
FIG. 3 shows a side view of a further embodiment of an injection moulding machine according to the invention,
FIG. 4 shows a section according to the line A-B in FIG. 3,
FIG. 5 shows the view 1 in FIG. 3,
FIG. 6 shows claim 2 of FIG. 3,
FIG. 7 shows a side view of a further embodiment of an injection moulding machine according to the invention,
FIG. 8 shows, again greatly exaggerated, a side view of this injection moulding machine under a high degree of closing pressure,
FIG. 9 shows schematically the side view of an injection moulding machine without a transom,
FIG. 10 shows schematically a side view of the closing device when the tool is open,
FIG

REFERENCES:
patent: 3111053 (1963-11-01), Svensson
patent: 3386324 (1968-06-01), Ihle
patent: 3829266 (1974-08-01), Melcher
patent: 5249951 (1993-10-01), Leonhartsberger et al.

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