Abstract: A pair of female die parts are mounted on a table of a lower frame of a folding press for forming a folding groove. One of the female die parts is slidably adjustable on the table with respect to the other female die part by an adjusting device including pairs of first and second tapered shims. The first and second shims of each pair are slidably arranged with respect to each other. The first shims are coupled with the adjustable female die part and the second shims of each pair are coupled with an actuating member connected to a driving device for adjusting the position of the second shims with respect to the first shims.

Abstract: The upper and lower frames of a folding press include a deflector capable of producing a deflection of at least one portion of a press member. A comparison device is provided which includes two longitudinal bars arranged, respectively, in longitudinal housings of each of the upper and lower frames. One of the ends of each of the bars is secured to its respective housing, the other end of each of the bars being free to move longitudinally in the housings and being connected to a measuring device respectively fixed to each of the upper and lower frames, so as to measure the respective movements of the other ends of the bars in their respective housings in response to any deflection of the upper and lower frames. The comparison device is arranged for controlling the deflector to compensate for any difference in deflection of the frames.

Abstract: A press has an upper table carrying a punch and a lower table bearing a tool-carrier. A jack for compensating the deflection inherent in the bending process is fitted in the lower table. The bending device enables the bending angle obtained in the workpiece to be monitored continuously. The bending device includes a series of paired measuring rods, circular in section and longitudinally machined to provide a flat surface for the lower surface of the workpiece to rest on, associated with devices for measuring the rotational angle of the measuring rods, and a control device connected to the rotational angle measuring device, to a device for controlling the jacks that actuate the punch and to the actuating device of the jack for compensating the deflection. A very accurate and constant bending angle is obtained throughout the length of the workpiece. The bending process is automatic and continuous once the operator has fed in the required bending angle.