Abstract: The invention relates to bending presses containing pistons providing up and down motion of an upper clamp, two servo motors for motion of the pistons, valves providing pre-filling during quick down and up motion of the pistons wherein upon driving of the four quadrant pumps by the servo motors, the four quadrant pumps rotate in descending direction and the upper clamp is moved downward and the servo motors rotate in reverse direction because of the weight of the upper clamp and the four quadrant pumps generate energy when servo motors are rotating on counter clockwise via kinetic energy that produced by ram weight, gravity and stroke distance of cylinder on press brake.

Abstract: Bending presses containing pistons providing up and down motion of the upper clamp, at least one engine for motion of the said pistons, and filling valves providing pre-filling during quick down and up motion of the pistons. The bending presses contain at least one pump of variable rotation and fixed displacement transmitting the motion received from the said engine to the pistons.