Circuit arrangement for an adjusting drive for a press ram adjustment

In a high-speed cutting press comprising a press ram, a platen, an upper die means attached to the press ram, a lower die means attached to the platen, the upper die means being adapted to penetrate into the lower die means during a cutting operation, and drive means for driving the press ram to adjust the position thereof, the improvement comprising a control arrangement for the adjusting drive of the press ram comprising means for actuating the drive means, switching means for controlling the connection between the drive means and the actuating means so that said drive means may be actuated in either a direction to raise the press ram or a direction to lower the press ram, and means for maintaining a depth of penetration of the upper die means into the lower die means at a constant value during operation of the high-speed cutting press in dependence upon an operating condition of the high-speed cutting press, wherein said maintaining means includes at least one limit switch means adjustably mounted at a press frame in a displacement path of the press ram for sensing the operating condition of the high-speed cutting press at the bottom end position of the moving press ram and for providing an output signal indicative of the sensed operating condition, and oscillator means operatively connected with the at least one limit switch means and the switching means for controlling the switching means so that the drive means is actuated in a direction so as to one of raise and lower the press ram to adjust the position thereof in response to the sensed operating condition.