US 6,059,556 AGranted

Injection apparatus for injection molding machine

AssigneeToshiba Kikai Kabushiki Kaisha

InventorsJun Koike, Masahiro Tamaki

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Abstract

An injection apparatus of an injection molding machine, for easy control of the charging motor and the injection motor and highly precise control of the back pressure of a screw thereby enabling performance of the proper charging operation, has an injection motor with a rotor adapted to act as a ball screw nut and which is secured to an injection carriage having mounted thereon a heating barrel of the injection apparatus. The injection motor has a shaft forming a ball screw in one end portion of the shaft connected to a screw of the injection molding machine. The ball screw is screwed into the rotor of the injection motor. The other end of the shaft forms a spline portion, and is connected to a charging motor that has a hollow drive shaft whose inside-diameter portion is spline-fitted onto the spline portion of the shaft.

Claims4

Dependent claims

An injection apparatus for an injection molding machine having a barrel unit and a motor driven screw disposed in the barrel unit rotatably and movably in the axial direction, said apparatus comprising:

an injection carriage movably disposed on a base of the injection apparatus for mounting the barrel unit thereon;
an injection motor, having a rotor provided with a ball screw nut integrally therewith, disposed movably in the axial direction of the screw;
a first shaft member having one end portion connected to the screw and the other end portion having a straight-sided spline shaft;
a second shaft member provided with a hollow shaft portion having an interior wall portion into which the spline shaft is fitted slidably so as to permit a retreat motion of the first shaft member, and a ball screw portion engaging with the rotor of the injection motor;
a charging motor for driving the second shaft member and disposed movably in the axial direction of the screw;
and
a guide member having structure constructed and arranged to guide the injection carriage, injection motor and the charging motor to move in the axial direction of the screw.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/116,585Filed 16 Jul 1998
Priority: JP 9-20710716 Jul 1997
Granted: 9 May 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B29C 45/5008
Axially movable screw: drive means therefor
B29C 2045/5028
Drive means therefor: screws axially driven by the coaxial rotor of an electric motor
B29C 2045/504
Drive means therefor: electric motors for rotary and axial movement of the screw being coaxial with the screw
B29C 2045/5048
Drive means therefor: screws axially driven and rotated by a drive shaft having a screw threaded part and spline part