Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector
Patent
1991-09-19
1993-11-02
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With product ejector
264334, 425444, B29C 4543
Patent
active
052579255
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for removing articles from, for example, a mold cavity between two mold halves of a machine, in particular an injection-molding machine, press or the like, there being connected to one mold half a drive element, which drives a drive wheel on the other mold half and thereby sets a rocker in pivoting motion, by means of which an arm with the removal apparatus can be guided out of the mold cavity by the rocker sliding into a channel between two guide strips and moving out of this channel in each predetermined end position of the arm, and the arm being held in these end positions.
Such apparatuses are known, for example, from International Patent Application WO 88/03238. In the embodiments shown there, a handling mechanism is introduced by mechanical means into the mold cavity of an injection-molding machine during the opening of the movable mold half and during closing of the injection-molding machine is forcibly moved out again from the mold cavity together with the article to be removed. Furthermore, although a carriage, on which the removal apparatus is fixed, is held in the respective end positions, there are always one or more pressure rollers interacting with a fixed stop. Although the apparatus has proved successful in practice, it is of a relatively complex construction and requires a great number of individual elements, which may be subject to wear, especially as these apparatuses are in some cases used in three-shift operation and enter the mold cavity of an injection-molding machine several times a minute.
SUMMARY OF THE INVENTION
The inventor has set himself the object of improving the fixing of the arm or carriage in the end positions and making the handling of the apparatus more reliable.
It leads to the achievement of this object that in each end position a locking unit fixed on the mold half accomplishes the fixing of the arm.
This preferably takes place by means of a single slide, which in the precisely defined end positions engages with corresponding detents in grooves or engages behind locking bars. In this arrangement, this slide is assigned a drive unit, which preferably comprises a rack and gear parts correspondingly coordinated with one another. As a result, an exact fixing and securing of the arm in its end positions is accomplished in a simple mechanical way.
Furthermore, the connection between the removal apparatus and one mold half can be released by means of a single rod with corresponding eccentrics, so that for example the injection-molding machine can also be operated unaffected without a removal apparatus. In any event, however, it is still ensured that whenever the machine closes, the arm or the removal unit connected to it is moved out of the mold cavity.
In the case of a further illustrative embodiment of the invention, the number of elements is reduced considerably, since then the slide has been replaced by simple disks, which interact with a likewise movable forked bolt. There is no longer any stop in the end positions, instead in the end positions, in which the speed of the carriage briefly approaches zero, the carriage is held by the disks once the guide roller has slid out of the guide channel.
According to the invention, the disks have in each case a sector cut-out, by which two control edges which can enter the forking of the forked bolt in the respective end position are formed in the solid disk part.
Above all, the adjustment of the end position fixing means is made much easier, since the disks are preferably arranged on a shaft, where they can be displaced. Similarly, in the desired end position, the disks can be turned about the shaft and then fixed in such a way that the desired engaging moment is precisely established.
The shaft itself takes over the movement of the disks, the shaft rotating about its longitudinal axis. This rotation is preferably accomplished by a drive device, which is coordinated with the movement of the crank arm. At the instant at which the crank arm or the guide roller o
REFERENCES:
patent: 3734666 (1973-05-01), Guest et al.
patent: 4901589 (1990-02-01), Gaigl
Gaigl Karl-Josef
Heitbrink Tim
Waldorf Veronika
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