Circuit arrangement for an adjusting drive for a press ram adjustment

Claim 1

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, the maintaining means includes a force measuring sensor means, a circuit means receiving signals from the force measuring sensor means for evaluating the received signals and providing an output signal upon the occurrence of a predetermined output signal from the force measuring sensor means, and oscillator means connected to said evaluator circuit means and the drive means for actuating the drive means in a direction so as to one of raise and lower the press ram in response to a predetermined force sensed by the force measuring sensor means.