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

045927138

ABSTRACT:
A mold closing unit has a multi-way valve in a hydraulic supply line leading to a hydraulic traveling cylinder which is controlled as a function of a speed pattern specified for the movable mold clamping plate. The valve body of this multi-way valve is arranged on an elongated, threaded rotatable spindle in an axially movable manner. The spindle is connected with a stepping motor which is controlled as a function of the speed pattern. As soon as the movable mold clamping plate has reached a predetermined distance from the stationary mold clamping plate, the stepping motor is switched to a higher number of steps per revolution and the mold is closed below the creep rate.

REFERENCES:
patent: 3564659 (1971-02-01), Koch et al.
patent: 3677685 (1972-07-01), Aoki
patent: 3797364 (1974-03-01), Schulze
patent: 3825235 (1974-07-01), Schwertfeger et al.
patent: 3857658 (1974-12-01), Muzsnay
patent: 3940930 (1976-03-01), Rosander
patent: 3941534 (1976-03-01), Hunkar
patent: 4009983 (1977-03-01), Jacobs
patent: 4253358 (1981-03-01), Schulze
patent: 4540359 (1985-09-01), Yamazaki
Berger Lahr, entitled "DIVI-STEP Type SST 088/SST 093".
Hartmann and Laemmle KG, entitled "Electro-Hydraulic Linear Amplifiers LVS, 10th Edition 1977.

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