Patent ID: 8061172

Claim:
A roll bender machine for bending metal sheets, the machine comprising a bending roller driven in rotation and about which sheet metal is rolled, and at least two backing rollers adapted to receive and bear against the sheet metal while it is being bent around the bending roller, the at least two backing rollers being mounted to rotate freely on a support that is adjustable in height so as to adapt the clearance between said bending roller and the at least two backing rollers to the thickness of the sheet metal, the bending roller being associated with at least one first set of means for compensating its deflection, at least in part, the at least two backing rollers being associated with at least one second set of means for compensating their deflection, the at least one second set being adjustable depending on a residual deflection of the bending roller, the at least one first set of means for compensating the deflection of the bending roller including an arm provided with a housing in which the bending roller is received in part, together with means for holding the bending roller in the housing, the arm having an outer shape in a form of a cylinder of circular cross section and around which bent metal sheet passing from between the bending roller and the at least two backing rollers is received, and the arm being secured, at one end thereof, to a main body of the machine and, at an opposite end thereof, including a mandrel mounted to a movable support arm so that, when the support arm moves from the mandrel, bent metal sheet carried on the arm may be removed from the arm.