Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Reexamination Certificate
1999-02-02
2001-02-20
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
C425S451000, C425S575000
Reexamination Certificate
active
06190154
ABSTRACT:
REFERENCE TO RELATED APPLICATIONS
The present application claims the priority of German Patent Application 196 31 432.1, filed on Mar. 8, 1996, the disclosed contents of which are hereby expressly used also for the subject-matter of the present application.
TECHNICAL FIELD
The invention relates to an injection molding machine for processing plasticisable materials such as, for example, plastics materials, pulverulent materials or ceramic materials according to the preamble of claim
1
.
PRIOR ART
Such an injection molding machine is known, for example, from DE-A 20 20 336, which forms the basis for the preamble of claim
1
, or from DE-C 32 14 728, not only to permit injection into the cavity of the injection mold by means of an injection molding unit via an injection opening provided in the mold, but to inject also into the parting plane, if necessary. However, a pivotal movement of the mold closing unit into a vertical position is advantageous, even when working with inserts. The basic provisions therefor are hereby simultaneously created to inject via the central sprue opening and into the parting plane by means of two injection molding units. For this purpose, it is necessary to pivot the mold closing unit from the horizontal position, in which the closing axis of the mold closing unit coincides with the injection axis of the injection molding unit, into a vertical position, in order to permit access to the parting plane. However, since the pivotal axis of the entire mold closing unit, disposed on a pivotal frame, cannot extend up to the level of the injection axis, it is necessary to pivot the injection molding unit via a first mechanical or manual drive and then to displace the parting plane, by means of a second unit in the form of a worm drive, to a level where the injection molding unit can inject. Apart from the outlay required therefor, this has the consequence that there is no end position certainty, since the optimum pivotal position only needs to be set during the pivoting-back movement into the horizontal position, more especially, so that the various drives are actuated several times.
It was hitherto assumed that a pivotal movement and a reliable displacement with the same drive unit are not possible. Basically, for an optimum pivotal movement without displacement if possible, it would be necessary to position the pivotal axis on a level with the closing axis. However, limits are set for these displacements of the pivotal axis by the mold clamping chamber, since otherwise a transfer of the tool to the mold clamping chamber is hindered. In prior art, therefore, the pivotal axes were disposed as low as possible. On the other hand, the space below the mold clamping chamber was to be kept free for the disposal of the injected parts and sprues, so that even this space was not occupied by a drive unit. In view of this, an attempt was made to effect the rotation about a pivot which lies, if possible, externally of a projection of the mold clamping chamber, and, in any event, to dispose the displacement mechanism in a space-saving manner laterally of the mold clamping chamber.
STATEMENT OF THE INVENTION
On the basis of this prior art, the basic object of the present invention resides in developing further an injection molding machine of the initially mentioned type, so that a pivotal movement into the various positions of the mold closing unit is rendered possible in an economical manner with as few driving means as possible.
This object is achieved by an injection molding machine having the features of claim
1
.
Only a single drive is now still basically required for the pivotal movement, since the pivotal movement and the displacement, possibly required; are accomplished by one and the same drive unit. The drive unit is pivotally disposed for such purpose, the desired effect of accomplishing all of the required movements with only one unit being achieved because of the ratio in respect of the spacing between the pivotal axis and the articulation point of the drive unit. Because of a displacement of the drive unit into a region which appeared unsuitable in prior art, it now becomes possible to dispose the operational axis of the drive unit so that it can simultaneously effect the pivotal movement, and so that it is also capable, when a structural unit is pivoted, to apply the forces for displacing the structural unit.
Further advantages are found in the sub-claims.
REFERENCES:
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patent: 3350746 (1967-11-01), Blumer
patent: 3373459 (1968-03-01), Hehl
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patent: 3720492 (1973-03-01), Hehl
patent: 3751203 (1973-08-01), Hehl
patent: 3761214 (1973-09-01), Hehl
patent: 3852010 (1974-12-01), Hehl
patent: 3909173 (1975-09-01), Latter
patent: 4005961 (1977-02-01), Manceau
patent: 4430059 (1984-02-01), Bielfeldt
patent: 4487569 (1984-12-01), Hehl
patent: 5753153 (1998-05-01), Choi
patent: 530 260 (1972-12-01), None
patent: 3214728 (1983-11-01), None
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patent: 2 525 526A (1983-10-01), None
Cantor & Colburn LLP
Luk Emmanuel
Pyon Harold
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