Two-platen mold-clamping apparatus

Details Two-platen mold-clamping apparatus Two-platen mold-clamping apparatus

1994-04-08

2001-01-30

Pyon, Harold (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to lock mold in closed position

C425S589000, C425S451700, C425S451900

Reexamination Certificate

active

06179607

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a two-platen mold-clamping apparatus for use in molding machines such as injection molding machines and press machines.
BACKGROUND ART
In general, three-platen type mold-clamping apparatuses having stationary, movable and rear platens, have been employed in molding machines such as injection molding machines. The mold-clamping apparatus of this kind are designed to use a toggle mechanism, a crank mechanism or a ball-screw/ball-nut mechanism to reciprocate the movable platen along a plurality of parallel tie bars which extend between and interconnect the stationary platen and the rear platen for mold-opening, mold-closing and mold-clamping operations. Such mold-clamping apparatus is arranged so that the tie bars may be elongated, during the mold-clamping operation, for generating a mold clamping force. And respective ends of the tie bars are supported by the rear platen to establish and maintain a constant parallel relationship between the stationary and movable platens. These conventional three-platen type mold-clamping apparatuses inevitably include a plurality of tie bars and the rear plate. However, these components are expensive, and it is therefore difficult to produce a three platen mold-clamping apparatus which is low-priced and free from complicated maintenance.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a two-platen mold-clamping apparatus which has a reduced number of structural parts, and does not include tie bars or a rear platen, and is therefore easy to maintain and low-priced.
In order to achieve the above-mentioned object, the two-platen mold-clamping apparatus of the present invention includes a stationary platen; a movable platen disposed for reciprocal motion relative to the stationary platen along a predetermined path; a plurality of ball nuts each mounted for movement with the movable platen along the path of rotation relative thereto; a respective elongated ball screw threadedly engaged with each of the ball nuts each ball screw having an end portion fixed to the stationary plate; a motor having an output shaft and mounted on the movable platen; and means for operatively coupling the output shaft of the motor to the ball nuts, whereby ball screws may be moved longitudinally relative to the moveable platen, during a mold-clamping operation, so as to generate a mold-clamping force.
As a result of the present invention which provides a plurality of ball screws, each of which is fixed to a stationary platen, and each of which is threadedly engaged with a respective ball nut that is coupled to a motor and that is axially immovably mounted on a movable platen, the ball screws may be moved longitudinally relative to the movable platen for generating a mold-clamping force. Accordingly, neither a rear platen nor tie bars are required and the resultant mold-clamping apparatus includes a reduced number of structural parts, is easy to maintain, and is low-priced.


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