Patent ID: 7001169
Filing Date: 2006-02-21
Classification: B29C,F16P

Abstract:
1. An injection molding machine for processing synthetic materials having a vertically movable mold-clamping plate, an electrical drive motor for moving the movable mold-clamping plate, a motor control unit for the drive motor, the drive motor producing a drive signal when moving the movable mold-clamping plate, a machine control unit and a safety device means for preventing unintentional movement of the movable mold-clamping plate, the safety device means comprising at least one retaining device for controllably preventing movement of the movable mold-clamping plate the machine control unit being connected to the drive motor and a movement sensor being connected with the machine control unit, the machine control unit including means for activating the at least one retaining device to prevent movement of the movable mold-clamping plate when a movement of the movable mold-clamping plate is indicated to the machine control unit by the movement sensor in the absence of a corresponding drive signal from the drive motor.