Method of controlling an ejector of an injection molding machine
AssigneeFanuc Corporation
InventorsMasao Kamiguchi, Yuichi Hosoya, Minoru Kobayashi
Life of this patent
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Abstract
An ejector mechanism is driven by a servomotor. An ejector pin in the ejector mechanism is made to perform a motion such that the ejector pin reaches a predetermined protrusion limit position beyond a position where the removal of a molded product from a cavity or core is completed after making a check for positioning, and a plurality of cycles of reciprocating motion of a short amplitude such that the ejector pin neither retracts beyond a position where the removal of the molded product from the cavity or core is started nor protrudes to the protrusion limit position, without requiring a check for positioning.
Claims5
An ejector control method for an injection molding machine, in which the operation of an ejector mechanism driven by a servomotor is controlled according to a movement command program, by which a molded product remaining in a cavity or core of a movable mold fixed to a movable platen is removed from said cavity or core and dropped by protruding an ejector pin in said cavity or core, said method comprising the steps of:
- making said ejector pin reach a predetermined protrusion limit position beyond a position where the removal of said molded product from said cavity or core is to be completed, by conducting positioning confirmation;
- and
- making said ejector pin perform a plurality of cycles of reciprocating motion of a short amplitude, without any positioning confirmation, so that said ejector pin neither retracts beyond a position where the removal of said molded product from said cavity or core is started nor protrudes to said protrusion limit position.
Dependencies are inferred from the claim text.