a press brake system for bending , flanging , folding and forming an elongate and curved worksheet , and a worksheet handling device for handling such a worksheet are disclosed . the press brake system includes a press brake including a punch and a matrix which cooperate along a bending line in a working plane , and members for straightening an elongate and curved worksheet . the worksheet handling device includes members for straightening an elongate and curved worksheet . such straightening members include : forcing members for applying force to the worksheet at central portion or end portions of a longitudinal edge , the force being in a direction perpendicular to the bending line and within a loading plane ; and fixing members for fixing the worksheet so that it can not move against the force . this design enables the system to carry out appropriate bending or flanging to obtain a work with flanges of constant width along bending lines .