Patent ID: 6755635
Filing Date: 2004-06-29
Classification: B29C

Abstract:
An apparatus for protecting molds in an injection molding machine, comprising:a cross head; a driving apparatus for driving the cross head; a movable mold connected to said cross head via a link mechanism; and a controller for controlling a forward thrust force of said movable mold when said movable mold is brought in contact with a fixed mold and the movable and fixed molds are closed, wherein said controller comprises: a memory table in which a correspondence table showing a relation between just a cross head position and a movable mold operation is stored beforehand; and a driving control unit which controls driving of said cross head by said driving apparatus so that said movable mold moves with a thrust force preset to a mold protecting force or less in accordance with the operation of the movable mold in a mold protection area of said movable mold; and wherein a limit value of a minus thrust force on a backward side during deceleration of said cross head during mold closing until said movable mold contacts said fixed mold indicates a maximum driving force of said cross head.