Drive for an index plate of an injection molding tool

Abstract

The invention relates to a drive device for a displacement plate (8) of an injection molding tool for an injection molding machine, particularly for a multicomponent or multicolor injection molding machine. The invention is characterized in that the rotating shaft has at least one first rear part serving as a driving portion (21) and has at least one second front part, which is connected to the displacement plate (8) and which serves as a supply part (22), in which channels (24, 25, 38) are located for supplying the displacement plate (8) with liquid or gaseous media and / or for leading through electric or fiber-optic lines. Both portions are preferably connected to one another by a releasable coupling (16). By separating the functions of rotational drive and media supply, the diameter of the supply part can be adapted to the respective conditions. On the other hand, the driving portion can be specifically designed for an optimal driving power.

Description

The drive device of the index plate of the injection mold technical field The invention relates to a drive for an indexing plate of an injection molding machine, in particular for an injection mold of a multi-component injection molding machine or a multi-color injection molding machine, and an injection molding machine equipped with such a drive. Background technique Various methods are known for producing multicomponent or multicolor injection molded parts. In the so-called indexing plate method, the injection mold is modified to provide an additional third plate, called an indexing plate, between the two basic mold halves. The indexing plate is rotatable around a central axis and axially movable along the machine longitudinal direction. The index plate constitutes a central part of the mold cavity in which a pre-injection molded product is formed, which may remain constant. After the fixed mold parts have been released, the indexing plate is rotated by 180° and the pr...

AI Technical Summary

Problems solved by technology

The disadvantage of the known indexing disk is firstly that the transmission technology does not allow the rotating shaft to have too large a diameter, which makes it difficult to guide the rotating shaft from the temperature control device, supply lines, etc. through the indexing disk

A further disadvantage is that bearings for rotating shafts with a multi-groove profile are subjected to a higher load, since the rotating shaft is supported in the bearing only with a part of its outer surface, i.e. only with splines protruding from the rotating shaft, In contrast, the bearing surface is omitted in the region of the groove

This has a detrimental effect especially on heavy indexing plates

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