Patent ID: 7434505
Filing Date: 2008-10-14
Classification: B30B

Abstract:
1. A system for controlling a servo press in which an eccentric rotation mechanism is driven by a servo motor, the rotation of which is controlled by a servo amplifier which receives a motor speed command, and the rotating power of the eccentric rotation mechanism is transmitted to a slide through a connecting rod or linkage, thereby vertically moving the slide, comprising: (a) a slide position detector for detecting a position of the slide; (b) a slide position deviation computing unit for calculating deviation of the slide position detected by the slide position detector from a target slide position; (c) a positional gain computing unit for calculating a positional gain according to a speed ratio of the slide; and (d) a motor speed instructing unit for calculating a motor speed command based on the slide position deviation calculated by the slide position deviation computing unit and the positional gain calculated by the positional gain computing unit and outputting the calculated motor speed command to the servo amplifier.