Patent ID: 8119044
Filing Date: 2012-02-21
Classification: B29C

Abstract:
1. An apparatus for controlling a plasticizing capability in an electric-motor driven injection molding machine having a plasticizing mechanism which consists of a screw injection drive system where rotation of a servomotor for injection is transferred to rotation of a ball screw through a reduction gear and rotation of said ball screw is converted to a linear motion of a nut of said ball screw and a screw is moved back and forth through a moving part drived by a movement of said nut and pressure application to the melted polymer stored at the end of a barrel is realized by the movement of said screw and the pressure applied to the melted polymer is referred to as a screw back pressure and a screw revolution drive system where rotation of a servomotor for plasticization is transferred to rotation of said screw through a reduction gear and resin pellets fed through a hopper are melted by the rotation of said screw and a given amount of melted polymer is stored at the end of said barrel, comprising: a screw back pressure controller operative to provide a motor current demand signal for said servomotor for injection to external, which comprises a motor controller for injection fed said motor current demand signal from said screw back pressure controller; and a motor controller for plasticization controlling a revolution speed of said servomotor for plasticization.