Patent ID: 11878337
Assignee: INGVEST AB
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A method according to claim 8, comprising the steps of
individually displacing the clamping rollers (23a, 23b) of the second pair of clamping rollers sideways transversally to said feeding direction, and individually pivoting the clamping rollers (23a, 23b) of the second pair of clamping rollers about a vertical pivot axis (PA2, PA3) during the forming operation, and
controlling, with the electronic control device (12), the sideways displacement and the pivoting of the clamping rollers (23a, 23b) of the second pair of clamping rollers during the forming operation such that said second peripheral folding edge (25) follows a fold line (F2, F3) between said web (4a, 4b) and the central flange (2) and that the plane (P2) passing through the centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to a part of the fold line (F2, F3) in contact with the second peripheral folding edge (25).