Patents
United States Patent 6059556
Douris , ê et al. May 9, 2000
Injection apparatus for injection molding machine
Koike , Ê et al. May 9, 2000
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.
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