Nissei Plastic Industrial Co., Ltd.

Junichi Yamashita

Hiroo Okubo

Isamu Yamaguchi

Atsushi Koide

A mold clamping apparatus of an injection molding machine includes a drive mechanism. The drive mechanism includes a first drive mechanism for opening/closing a mold at high speed through advancement/retreat of a movable platen effected by means of a first drive motor unit and a first ball screw mechanism; a second drive mechanism for clamping the mold at high pressure through application of pressure to a pressing member effected by means of a second drive motor unit and a second ball screw mechanism; an engagement mechanism for engaging the movable platen with the pressing member in the course of advancement of the movable platen; and a clutch mechanism which is operated after establishment of the engagement effected by the engagement mechanism, in order to interlock the pressing member with the movable platen to thereby enable the pressing member to apply pressure to the movable platen.

Mold clamping apparatus of injection molding machine

A mold-thickness adjustment mechanism is provided which uses intermediate toothed wheels engaging with a pair of toothed wheels on a tie-bar side. The mechanism includes a toothed wheel on an outer surface of a pressure-receiving plate and toothed wheels with a large diameter for mold-thickness adjustment provided together with a toothed wheel-driving motor on the side of the pressure-receiving plate on the central portion of an outer surface of the pressure-receiving plate. Intermediate toothed wheels are arranged between the toothed wheels with the large diameter and a pair of toothed wheels of one side of the pressure-receiving plate to engage each other. A pair of the toothed wheels is designed to rotate by rotation of the intermediate toothed wheels at the same time, whereby a diameter of the toothed wheel with the large diameter is constituted approximately equally to the breadth of the plate body of the pressure-receiving plate.

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Nagano, Japan

Junichi Yamashita