| 摘要 |
Disclosed herein is means for correcting the position of bottom dead center of a slide in a press having a frame, a crankshaft rotatably mounted on the frame, and a slide connected to the crankshaft and movable in a vertical plane, wherein the correlation between the rotational speed of the crankshaft and the bottom dead center position of the slide is determined in one-to-one correspondence. The means comprises a variable speed motor for rotating the crankshaft; a sensor for sensing the position of bottom dead center of the slide; and a control circuit for comparing the signal generated from the sensor which is representative of the bottom dead center position with a signal representative of a preset reference position of bottom dead center of the slide and controlling the speed of the motor to suit the speed representative of the reference position of bottom dead center of the slide.
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