Kabushiki Kaisha Meiki Seisakusho

Nisso Electric Company

Aronkasei Co., Ltd.

Kabushiki Kaisya Meiki Seisakusyo

Ryozo Morita

Keijiro Oka

Satoshi Tomita

Satoshi Nishida

Hiroshi Shibuya

Tokuzou Sekiyama

Takashi Shinoda

Tsuyoshi Miyaki

Tadashi Hasegawa

Shinichi Nakamura

Shigemi Kushida

Yoshimitsu Tabata

Ryoji Takashi

An injection molding machine comprises a pre-pressure addition meansadding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screwto a detection meansand/or the screw, the detection meansdetecting the axial pressures A and B of the screw, and a screw movement control meanscontrolling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition meansis made non-contact with the direction means, a forward and backward driving motoris disposed adjacent to a heating cylinder, and a screw connectorat the rear end of the screwis spline-connected inside a rotating rotor of a screw rotating motor. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Injection molding machine and method of controlling the injection molding machine

An injection molding machine comprises a pre-pressure addition meansadding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screwto a detection meansand/or the screwthe detection meansdetecting the axial pressures A and B of the screw, and a screw movement control meanscontrolling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition meansis made non-contact with the direction meansa forward and backward driving motoris disposed adjacent to a heating cylinderand a screw connectorat the rear end of the screwis spline-connected inside a rotating rotor of a screw rotating motorAccording to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Injection molding machine having a screw support base moved by an actuator

A mold clamping apparatus including a moving device for moving a movable plate relative to a stationary plate. The moving device includes (a) a plurality of ballscrew shafts each of which extends from the stationary plate toward the movable plate, and each of which is supported at an axis end portion thereof by the stationary plate, so as to be rotatable relative to the stationary plate and so as not to be displaceable relative to the stationary plate in an axial direction thereof; (b) a plurality of servo motors which drive the respective ballscrew shafts, and which are disposed on one of opposite sides of the movable plate remote from the stationary plate, each of the servo motors having a rotor which is connected to the other axial end portion of the corresponding one of the ballscrew shafts such that the rotor and the corresponding ballscrew shaft are rotatable together; and (c) a plurality of ballscrew nuts which engage the respective ballscrew shafts and are fixed to the movable plate, so as to be moved in the axial direction with rotations of the respective ballscrew shafts, for thereby carrying the movable plate in the axial direction.

Mold clamping apparatus having ballscrew directly connected to rotor of servo motor

Mold clamping apparatus is disclosed which includes: an electrically-operated movable-platen-driving device of ball-screw type having a first ball-screw shaft supported by one of a movable and a rear platens, a first ball-nut threaded-engaged with the first ball-screw shaft and supported by the other of the movable and rear platens, and a movable-platen driving device for rotating the first ball-screw shaft and nut relative to each other so as to generate a relative longitudinal motion of the first ball-screw shaft and nut so that said movable platen is moved toward and away from a stationary platen to close and open the mold; a pressure-generating cylinder device having a pressure-generating piston moved by the relative longitudinal motion of the first ball-screw shaft and nut in order to generate a hydraulic pressure; and a mold clamping cylinder device adapted to generate a mold clamping force based on the hydraulic pressure applied from the pressure-generating cylinder device; and an engaging device which is operable for connecting a mold clamping ram of the mold clamping cylinder device with the movable platen, for applying the mold clamping force to the movable platen. The method of controlling operation of the apparatus is also disclosed.

Mold clamping apparatus and method of controlling operation of the apparatus

A pre-plasticizing injection apparatus operated with a mold clamped by a mold clamping device comprises: a screw device movable toward and away from the mold clamping device and including a heat-plasticizing cylinder having a bore and a screw which rotatably extends through the bore, so that a resin material introduced into the heat-plasticizing cylinder is fed by rotation of the screw to one axial end of the heat-plasticizing cylinder, while being plasticized, and is ejected from the axial end; and a plunger device movable toward and away from the mold clamping device and including a plurality of heating and injecting cylinders and an injection nozzle which is connectable to the mold, each heating and injecting cylinders being operated to store therein the resin material plasticized by the screw device, while being operated to inject the resin material through the injection nozzle into the mold; and a switching valve device which permits the screw device to be connected to at least one of the plurality of the heating and injecting cylinders to supply the resin material from the screw device to the cylinder, while at the same time permitting the injection nozzle to be connected to at least one of the rest of the plurality of heating and injecting cylinders to inject the resin material store in the cylinder through the injection nozzle into the mold. An injection molding method using the injection apparatus is also disclosed.

Pre-plasticizing injection apparatus having a plurality of heating and

A screw-in-plunger injection apparatus is provided which is advantageously used for molding either a large-size or a small-size product. The injection apparatus is capable of selectively carrying out a plunger-type injection operation and an inline-screw-type injection operation. In the plunger-type injection operation, an injection plunger 12 and a screw 10 are advanced in an injection cylinder 14, so that a melted resin fed to a storage space provided on the side of one axial end of the injection plunger 12 is injected. In the inline-screw-type injection operation, a surface of the axial end of the injection plunger 12 is held in abutment with the injection cylinder 14, so that the storage space is reduced to provide a reduced storage space to and from which the melted resin is fed by the rotation of the screw and is injected by the movement of the screw in an axial direction thereof.

Growing community of inventors

Nagoya, Japan

Ryozo Morita