Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Patent
1997-04-10
1999-03-30
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
B29C 4566
Patent
active
058885609
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to an injection molding machine comprising a substantially C-shaped machine frame, on one limb of which is mounted a stationary mold mounting plate and on the other limb of which is mounted a closing mechanism for driving a movable mold mounting plate, wherein the free ends of the limbs of the machine frame, which are not connected by beam members, deform under the influence of the closing force which occurs during the closing operation.
An injection molding machine of that kind is known for example from DE-U1-92 12 480. The object of the invention is to simplify the construction and nonetheless to provide for good guidance of the mold mounting plates and absolute parallelism of the two mold halves, even when very high mold driving forces are involved.
SUMMARY OF THE INVENTION
The object according to the invention is attained in that arranged between the stationary mold mounting plate and/or the closing mechanism on the one hand and the machine frame on the other hand is at least one holding portion which is deformed when the closing force is applied whereby the stationary mold mounting plate or the closing mechanism is tilted relative to the machine frame.
Such a design configuration makes it possible to avoid the pivot trunnions which were used hitherto in relation to injection molding machines without connecting beam members. If, in an injection molding machine according to the invention, the two limbs of the machine frame pivot outwardly about notional lower axes of rotation under the influence of the closing force, the stationary mold mounting plate and/or the closing mechanism mutually pivot about notional upper pivot axes.
The invention can be embodied by means of different structures. In that respect the only essential consideration is that the deformation of the connecting region of the stationary mold mounting plate or closing mechanism on the one hand and the machine frame on the other hand, as is produced by the closing force, at least approximately compensates for expansion of the machine frame which is open at the top.
Preferably the holding portions as well as the machine frame comprise steel. The holding portions however do not have to be in one piece with the machine frame but can be in the form of separate components. That affords the possibility of making holding portions and machine frame from different material and in particular making the elasticity of the holding portions greater than that of the machine frame.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the invention are described in detail hereinafter with reference to the Figures of the accompanying drawings.
FIG. 1 is a diagrammatic side view of an injection molding machine according to the invention and FIGS. 2 and 3 each diagrammatically show side views of the stationary mold mounting plate and the associated part of the machine frame.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The essential part of the injection molding machine is the machine frame 1 which carries the stationary mold mounting plate 2 by way of a frame limb 9 and a flange 3 of the closing mechanism 4 by way of a frame limb 7.
In the illustrated embodiment the closing mechanism is a hydraulic piston-cylinder unit. It would however also be possible to provide an electromechanical closing mechanism, for example also a bell crank mechanism. The movable mold mounting plate 8 is displaced by way of the closing mechanism 4.
In the embodiment shown in FIG. 1 both the stationary mold mounting plate 2 and also the closing mechanism 4 are mounted on the machine frame 1 by means of a plurality of separate holding portions 5, 6. In the illustrated embodiment the holding portions 5 between the stationary mold mounting plate 2 and the machine frame are loaded in compression and the holding portions 6 between the drive plate 3 and the machine frame 1 are loaded in tension. It would however also be possible for the flange 3 of the closing mechanism 4 to be mounted at the inside of the frame limb 7,
REFERENCES:
patent: 5538415 (1996-07-01), Reinhart et al.
patent: 5556656 (1996-09-01), Lampl et al.
patent: 5578329 (1996-11-01), Hehl
patent: 5650182 (1997-07-01), Fuller et al.
Engel Maschinenbau Gesellschaft m.b.H.
Heitbrink Tim
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