When the mechanical press is working, the motor drives the large belt pulley through the V-belt, and drives the crank slider mechanism through the gear pair and clutch to make the slider and the punch go down in a straight line. After the forging work of the mechanical press is completed, the sliding block moves upward, the clutch automatically disengages, and the automatic device on the crank shaft is connected, so that the sliding block stops near the top dead center.