Injection moulding clamping apparatus for an injection moulding machine
AssigneeTsuois Corporation
InventorToru Shibata
Life of this patent
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Abstract
Injection pressure acting on a molten material inside a nozzle in an injection process also acts on a mould clamping piston disposed in an injection cylinder to face an injection piston. The injection pressure acting on the mould clamping piston is transmitted to an auxiliary platen mounted at the right ends of tie bars, thus producing tensile force in the tie bars. Because of the tensile force, a movable platen mounted at the left ends of the tie bars is pulled toward a stationary platen, which in turn presses a movable mould against a stationary mould. Consequently, clamping force proportional to the injection pressure acts on the moulds, thus firmly clamping the moulds.
Claims10
A mould clamping apparatus for an injection moulding machine comprising:
- a plurality of tie bars having a peripheral surface
- a stationary platen mounted to the tie bars, said stationary platen having a back surface and a front surface, said front surface having a stationary mould;
- a movable platen also mounted to the tie bars and said movable platen having a movable mould, said movable mould defines, together with the stationary mould, a cavity for a moulding article;
- a mould opening/closing means for moving the movable platen to open or close said stationary and movable moulds;
- a housing disposed at the back surface of the stationary platen, said housing having an injection cylinder in which an injection piston slides, said injection piston having a peripheral surface;
- and
- a mould clamping means for applying a mould clamping force to said stationary and movable moulds against an injection pressure acting on the injection piston so as to clamp said stationary and movable moulds together,
- the mould clamping means including a converting means for converting the injection pressure into the mould clamping force and transmitting the mould clamping force to said stationary and movable moulds, so that a mould clamping process is synchronized with an injection process.
Dependencies are inferred from the claim text.