Molding apparatus with rotatable sprue bushing
AssigneeShinkoh Selubic Co., Ltd.
InventorHiroshi Takeuchi
Life of this patent
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Abstract
A molding apparatus includes a rotatable sprue bushing mounted in mold halves and formed with a sprue therein for introducing material into a mold cavity. The sprue communicates with a gate, as an outlet of the sprue, located at a position radially displaced from a center axis of the sprue bushing. Since the sprue bushing is rotated by a ring gear driven by a motor provided in or beside the mold half, the gate of the sprue rotates around the center axis when molten resin is introduced into the mold cavity, and therefore, the molding apparatus can eliminate localization of stress in molded articles, thereby improving quality of the molded articles.
Claims8
A molding apparatus for molding articles by introducing molten resin into a mold cavity thereof, comprising:
- a stationary mold half;
- a movable mold half capable of moving relative to said stationary mold half so as to come into contact with said stationary mold half to define said mold cavity for forming said article;
- a rotary member mounted in one of said stationary and movable mold halves so as to be rotatable about a center rotation axis of the rotatable member, said rotary member having a passage with a resin inlet located on said center rotation axis, and a gate which opens to said mold cavity located at a position radially displaced from said center rotation axis;
- and
- drive means for driving said rotary member to rotate about said center rotation axis while filling the molten resin into said mold cavity through said resin passage.
Dependencies are inferred from the claim text.