A.k. Technical Laboratory, Inc.

Sentaro Kobayashi

Naohide Matsuzaka

Hideaki Koda

Motohiro Matsuzawa

Osamu Sakai

An injection/stretch blow mold clamping mechanism comprises mold clamping shafts erected vertically movably on both sides of an injection molding operation section and extending through the lower base platen and upper base platen, hydraulic mold clamping means connected respectively to lower ends positioned within a bed of the clamping shafts, a mold clamping platen having core molds attached thereto and being fitted on the mold clamping shafts, the clamping platen being installed vertically movably between the upper base platen and a top platen, a pair of mold air cylinders connecting on both sides thereof the upper base platen and the clamping platen with each other and causing the clamping platen to move vertically with respect to the upper base platen, a mold clamping rod connected to the mold clamping platen through the top platen, and a pair of clamp members disposed on an upper surface of the top platen.

Injection/stretch blow molding machine

Improvement of simplicity and durability of a stretch rod extending device and a bottom mold lifting device, equipped on a stretch blow molding machine, is achieved by applying a combination of a magnetic screw shaft and a magnetic nut member, which is able to convert rotary-linear movement smoothly without contact. The nut member and the screw shaft of the extending deviceand lifting devicecomprise a magnetic nut memberand a magnetic screw shaft, having spiral N magnetic pole and S magnetic pole alternately provided on inner peripheral surface of a cylindrical member and outer peripheral surface of a shaft at a same regular pitch. The magnetic screw shaft is inserted into the plunger, having the magnetic nut member equipped inside with keeping required clearance so as to match the magnetic pole to oppose the magnetic nut member at the same poles each other.

Stretch rod extending device and bottom mold lifting device for stretch blow molding machine

To realize direct and intermittent rotation of a transfer member by directly coupling the rotary part of a servo motor with a rotary shaft. A supporting board is arranged side by side with working spacemade vacant above a machine base. The center part of a transfer member arranged on the undersurface of a supporting boardis coupled with a rotary shaftof a relatively large diameter inserted through the center of the supporting board and mounted on a bearing. The servo motorprovided with the fixing partinside of the rotary partof the large diameter in the center of the supporting boardis attached to a supporting baseerected on the supporting boardvia a jointon the side of the fixing part. The rotary partis mounted on the top of the rotary shaftand thereby the transfer memberis constructed so as to be directly rotated with the rotary shaftby the servo motor

Rotary transfer device in blow molding machine

A mold clamping apparatus in which hydraulic oil that is forcibly discharged into hydraulic lines from one of two kinds of cylinders, that is, a differential mold clamping cylinder and a mold clamping oil chamber of a mold opening/closing cylinder, is, in an alternating manner, provided to the other cylinder as its operating oil. This feature enables the simultaneous operation of the two kinds of cylinders as well as reduction in operating time in which the mold is opened or closed. The mold clamping apparatus includes a stationary mold, a movable mold which closes with respect to the stationary mold, a core movable through the movable mold into and out of the stationary mold. The movement of the core into and out of the stationary mold is effected by a differential mold clamping cylinder which is separate from a mold opening/closing cylinder for the movable mold and is fitted with a booster ram. A hydraulic line on the mold opening side of the mold opening/closing cylinder and a hydraulic line for the differential mold clamping cylinder are interconnected to one another via a communication passage with a pressure/flow control valve disposed thereon. While the movable mold is opened and closed and the core is moved into and out of the stationary mold, a volume of hydraulic oil that is discharged into these hydraulic lines is alternately provided to the mold opening oil chamber or to the differential mold clamping cylinder.

Growing community of inventors

Nagano-ken, Japan

Sentaro Kobayashi