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
Patent
1998-04-02
2000-08-29
Mackey, James P.
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
425192R, 425556, 425577, B29C 4517, B29C 4542
Patent
active
06109904&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a mold closing unit comprising a device for handling and/or removal of injection moldings wherein there is provided a stationary mold carrier; a movable mold carrier displaceable towards and away from the stationary mold carrier; a mold clamping space formed between the movable and stationary mold carriers and adapted for receiving a mold comprising a mold cavity for manufacture of moldings; a supporting element supporting the device at the mold closing unit; the device including a handling element actuatable for penetrating linearly into the mold to the mold cavity when handling or removal of moldings is required; an actuating element for actuating the handling element; and an electromechanical drive unit for driving the actuating element, wherein the drive unit, the supporting element and the handling unit comprise a structural unit which is independently detachable from the mold closing unit.
PRIOR ART
Such a mold closing unit comprising a device for handling and/or removal of moldings constituted as a structural unit and having multiple uses is known from DE 42 28 140 A1. It can be tested at the customer's company with regard to its operatability before the device is installed and can be transferred from machine to machine, if the customer should require it. For this purpose the unit has only to be connected to a corresponding connection component in the area of the mold of the injection molding machine and to a mains supply. The device is driven via an electromotor as for example a gear motor, so that a triggering via a spur gear takes place. This not only involves an additional expenditure, but means that in the space already required for the mold closing device of the mold closing unit, space for arranging the gear motor and the gear has to be provided, if an ejector is applied. This makes it more difficult to transfer the device to different machines and in some cases even impossible.
From DE 44 09 822 A1, a planetary-rolling-thread-spindle drive is known, which makes possible an extremely precise triggering of the ejector. In this spindle drive known as such from EP-B 320 621, planet rolls are provided, which on the side of the nut, mesh with rills of the nut and on the side of the spindle are in connection with the thread of the spindle. Through a rolling motion, thread pitches up to a range of 0.1 mm per each thread pitch are possible. Due to the rolling motion these drives have an extremely low noise level, although, a space-robbing separation between motor and drive is the consequence which is not desirable in the area of the ejector.
In the field of electro mechanical machines, electrical devices are also known for handling and/or removal of moldings from the injection mold. These known devices mostly have a problem that they cannot work sufficiently precise or that not enough space for the ejectors is at disposal, since when electromotors are applied, a rotational movement always has to be converted into a linear movement. The linearly moved element of the drive then, however, needs a corresponding space at the injection molding machine. In this field, however, it is unusual to use the same element as ejector-, core drawback- and unscrewing-device.
A mold closing unit is known for example from DE 82 33 362 U1 for hydraulically working machines. This device serves as an ejector for ejecting the moldings manufactured in an injection molding process. The ejector units or alternatively core drawback- or unscrewing devices (DE 19 62 663 B2) required therefor, however, are because of space reasons, arranged fixedly in the area of the mold closing unit and are not displaceable.
SUMMARY OF THE INVENTION
Based on this state of the art, it is an object of the invention to create a space-saving, electromechanically working device for handling and/or removal of moldings, which is multiply usable as an independant, operative unit.
The above and other objects are accomplished according to the invention by the provision of a combination of a mold closing unit a
REFERENCES:
patent: 4645446 (1987-02-01), Hehl
patent: 5585126 (1996-12-01), Heindl et al.
patent: 5711971 (1998-01-01), VanderSanden
Kelemen Gabor J.
Mackey James P.
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