Patent ID: 7275922
Filing Date: 2007-10-02
Classification: B29C

Abstract:
1. A controller for controlling an ejector mechanism of an injection molding machine having means for moving ejector pins forward to project into a mold, springs for generating an elastic force to return the ejector pins to a retracted position, and brake means for generating a retaining force to retain the ejector pins at a terminal position of the forward motion, said controller comprising: position detecting means for detecting a position of the ejector pins; elastic force detecting means for detecting an elastic force of the springs during a forward motion of the ejector pins from the retracted position; determining means for determining a criterial position of the ejector pins where the detected elastic force of the springs is equivalent to the retaining force of the brake means; and display means for displaying the detected criterial position of the ejector pins for setting the terminal position of the forward motion of the ejector pins.