Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector
Patent
1988-06-17
1989-09-12
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With product ejector
425589, 425595, B29C 4566
Patent
active
048655368
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct mold clamping apparatus with an ejector, which is capable of uniformly applying a mold clamping force to a movable platen and is simple in construction and compact in size.
2. Description of the Related Art
Conventionally known direct mold clamping apparatuses include a push rod fixed to a movable platen, a ball nut attached to the rod so as to be rotatable and movable integrally with the rod and a ball screw mating with the nut. The ball screw is rotated in forward and reverse directions to reciprocate the movable platen, thereby effecting mold closing and mold opening operations. In apparatuses of this type, an ejector for ejecting moldings is attached to the movable platen in a manner such that the movable-platen-side end portion of the push rod is branched so that each branch end portion extends at a location outwardly of the ejector, and the extreme end of the branch end portion is coupled to its corresponding edge portion of the movable platen, to avoid interfering with the ejector. However, the distribution of a driving force applied to the movable platen through the branch end portions of the pusher rod is likely to produce irregular pressure force, so that the movable platen may possibly be deformed when it is subjected to a mold clamping force. In this case, a gap will be formed between a movable die and a stationary die at their contact faces, so that the moldings will be burred, for example. Thereupon, the movable platen is conventionally given a high rigidity such that it cannot be deformed even when it is subjected to an irregular mold clamping force. To attain this, however, the weight of the movable platen is increased thus requiring the use of a high-output drive source. As the moving speed of the movable platen is reduced, moreover, the required molding cycle time is inevitably lengthened. If the movable platen is bent as aforesaid, the movable platen rubs against its tie bars, thus creating friction loss and errors in control of the mold clamping force.
Furthermore, the mold clamping apparatuses with ejector are required to be simplified in configuration and made compact.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a direct mold clamping apparatus with an ejector, which apparatus is capable of uniformly applying a mold clamping force to a movable platen and is simple in construction and compact in size.
In order to achieve the above subject, according to the present invention, there is provided a direct mold clamping apparatus with ejector, where a first ball nut is attached to a hollow push member, fixed to a movable platen, so as to be non-rotatable relative to the push member and movable integrally therewith, and a first ball screw, which is threadedly engaged with the first ball nut and extends through a hollow portion of the pusher member, is rotated by means of a first drive source, thereby effecting mold closing and mold opening operations.
In this mold clamping apparatus, the push member is coupled to a central portion of the push-member-side end face of the movable platen through a substantially single annular junction plane. An ejector of the mold clamping apparatus includes a second ball nut supported in the hollow portion of the pusher member so as to be rotatable and axially immovable relative to the movable platen. A second ball screw, which mates with the second ball nut, is disposed in axial alignment with the first ball screw, and has, as its one side remote from the movable platen, one end portion removably fitted in a hole axially formed in a corresponding end portion of the first ball screw. An ejector pin is fixed to another end portion of the second ball screw facing the movable platen, and is arranged for projection from an end face of the movable platen remote from the push member. Further, a second drive source is operatively connected to the second ball nut.
According to the present invention, as described above, the components of the
REFERENCES:
patent: 4230442 (1980-10-01), Rees et al.
Inaba Yoshiharu
Mitoguchi Fumio
Tokunaga Shigeo
Fanuc Ltd.
Heitbrink Timothy W.
Woo Jay H.
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