Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, has a first and second pumps for supplying with an operating fluid a first and second actuators, position transducers and a first and second proportional valves to adjust the flow of the operating fluid into the first and second actuators according to signals of the position transducers.

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, has a first and second pumps for supplying with an operating fluid a first and second actuators, position transducers and a first and second proportional valves to adjust the flow of the operating fluid into the first and second actuators according to signals of the position transducers.

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, having pump means for supplying with an operating fluid first actuating means and second actuating means; position transducer means connected operationally to an electronic control unit; and first and second proportional valve means operatively controllable by said electronic control unit to adjust the flow of said operating fluid into said first and second actuating means according to signals of said position transducer means.

Abstract: A device and a system for positioning work pieces having cylindrical and/or hollow conical bodies, to be processed in workstations. The system comprises at least a first and a second independent positioning devices for positioning and driving in rotation the work pieces to be processed; each positioning device for a base frame provided with two roll groups for supporting the work piece to be processed, each provided with parallely arranged rolls. One or both of roll groups are movable in horizontal and/or vertical direction with respect to the base frame; a gear motor is operatively connected to the roll of at least one of the roll groups for drivingly rotate the work piece to be processed.

Abstract: An automatic roll bending machine for bending metal sheets, sections and the like. The machine includes two or more bending rolls and a driver for causing rotation and/or changing the working positions of the rolls. The driver is operatively connected to an electronic control device that includes a programmable process unit provided with a movable digital control board which can be manually operated by an operator for remotely controlling in a selective manner the movements of each roll and for performing automatic execution of a bending cycle.

Abstract: A process and a roll bending machine for bending plates. The plate to be bent is made to pass between upper and lower gripping rolls parallely arranged between each other; at least one of these rolls is connected to a drive motor for rotation. One of the rolls is upwardly movable to exert a required working pressure on the plate, and it is adjustably urged against the other roll in at least one intermediate position of its length till causing a deflection of both the rolls in the same direction, making one roll to assume an arch shaped configuration substantially conforming to the configuration of the other roll, in such a way to generate an homogenous bending pressure for the entire width of the plate which is thus bent with a substantially constant bending degree.

Abstract: A roll bending machine for bending plates or iron sheets comprising an upper roll for dragging the plate, a central gripping roll and lateral bending rolls beneath the upper roll, wherein the flexure of each roll of the bending machine is opposed by a longitudinal beam and by a plurality of rolling members disposed between each roll and the longitudinal support beam. The rolling members are mounted in pairs which are individually adjustable relative to their associated beam in directions toward and away from the beam.

Abstract: A roll bending machine for bending plates or iron sheets with a programmable work cycle; a central processing unit (CPU) by suitable sensing means controls the working positions of the rolls of the bending machine adjusting them according to programmed data which can be modified each time by an operator or automatically, according to the characteristics of the plate being worked. The use of a three-point sensing device enables the diameter which the machine is conferring to the plate, to be controlled, intervening to make the necessary corrections.