Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under...
Patent
1997-11-05
1999-11-09
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
264334, 425556, B29C 4540
Patent
active
059802359
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
An apparatus for driving a displaceably mounted component of an injection molding machine having at least one rotatably mounted crank which is driven by a motor and which drives the displaceably mounted component by way of a bar pivotably connected to the crank. In injection molding machines, crank drives having a rotatably mounted crank and a bar pivotably connected thereto are already known for converting rotary movements, in particular from the drive of an electric motor, into a linear movement.
SUMMARY OF THE INVENTION
In order to improve the transmission of force to the displaceably mounted component and to afford the possibility of increasing the force applied to the displaceably mounted component, the invention provides that the bar engages a tiltably mounted intermediate lever which in turn is connected to the displaceably mounted component.
In accordance with the invention therefore the bar which is driven by the crank does not directly engage the displaceably mounted component, but an intermediate lever which then in turn engages the displaceably mounted component. That makes it possible to improve the geometry involved in the transmission of force and, if this is desirable, also to achieve a lever step-up effect which increases the force on the displaceably mounted component.
It is particularly desirable if the intermediate lever is in the form of a two-armed lever which at the center is pivotably connected to the displaceably mounted component which is pivotably connected on one side of the center to the bar driven by the crank and which is tiltably mounted on the other side of the center.
Such an arrangement, in spite of the fact that there is only a single crank, makes it possible to achieve a structure which is substantially symmetrical in regard to the transmission of force.
In the case of injection molding machines, in particular with a closing force range of between 300 and 3000 kN, there is increasingly a demand for individual electrical drives. Advances in the area of three-phase current servo technology afford an alternative to fully hydraulic machines in so-called hybrid machines in which one or more electrical individual drives are combined with a relatively small hydraulic central drive. In that situation electrical individual drives are distinguished by a low level of power consumption, precise controllability and regulatability and a high level of dynamics involved in the starting and stopping movements in the injection molding procedure.
In order to achieve the energy density which is known from hydraulics however electrical individual drives have to be of very large dimensions. In that case there is the problem that no apparatus which is comparable to storage hydraulics is known in connection with electrical drives, for producing high power peaks as occur at different locations in the injection molding procedure.
Therefore a further object of the present invention is to provide an apparatus by which the power of the electric motor of an electrical individual drive can be kept as constant as possible in the region of the power average of an injection molding cycle during the cycle.
In accordance with an aspect of the invention that is achieved in that there is provided a spring which assistingly acts on the movable component in that direction of movement which requires a higher level of power on the part of the electric motor.
In the case of the linear movements which occur in injection molding, there is typically a large difference in the motor power required for the movement, depending on the direction of movement involved. In addition, in part only short power peaks also occur in connection with that direction of movement which overall has the higher level of power requirement. Those power peaks mostly occur at the beginning of the movement, that is to say during the acceleration phase, as in many cases large masses have to be moved or accelerated. If the motor which is producing the linear movement operates against a spring during the
Eppich Stefan
Urbanek Otto
Engel Maschinenbau Gesellschaft m.b.H.
Heitbrink Tim
LandOfFree
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