Mold closing unit of an injection molding machine

Details Mold closing unit of an injection molding machine Mold closing unit of an injection molding machine

1984-08-01

1986-06-03

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

264 405, 4254512, 425590, 425DIG223, B29C 4568

Patent

active

045927146

ABSTRACT:
A mold closing unit of an injection molding machine has a threaded spindle which is engaged with the movable mold clamping plate of the machine via a spindle nut. The spindle is attached to the stationary mold clamping plate of the machine in a freely pivotable manner, and is connected with a stepping motor by means of a coupling. The stepping motor is controlled depending on a specified speed pattern as a function of the distance between the mold halves of the mold clamping plates. The valve body of a 4/2-way valve engages the spindle for relative axial movement and controls the hydraulic operating medium for the mold closing unit. A switch is arranged in the casing of the valve which can be triggered by the coupling and which actuates, for example, an indication system when a mold closure security error occurs.

REFERENCES:
patent: 3564659 (1971-02-01), Koch et al.
patent: 3642405 (1972-02-01), Eggenberger et al.
patent: 3677685 (1972-07-01), Aoki
patent: 3704973 (1972-12-01), Renfrew et al.
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patent: 4253358 (1981-03-01), Schulze
patent: 4473345 (1984-09-01), McDowall
patent: 4540359 (1985-09-01), Yamazaki
Berger Lahr, entitled "DIVI-STEP Type SST 088/SST 093".
Hartmann and Laemmle KG, "Electro-Hydraulic Linear Amplifier LVS", 10th Edition 1977.

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