US 12,290,850 B2
Machine for working bars and corresponding working method
Giorgio Del Fabro, Udine (IT)
Assigned to M.E.P. MACCHINE ELETTRONICHE PIEGATRICI S.P.A., Reana del Rojale (IT)
Appl. No. 17/428,925
Filed by M.E.P. MACCHINE ELETTRONICHE PIEGATRICI S.P.A., Reana del Rojale (IT)
PCT Filed Feb. 5, 2020, PCT No. PCT/IT2020/050020
§ 371(c)(1), (2) Date Aug. 5, 2021,
PCT Pub. No. WO2020/161758, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 102019000001631 (IT), filed on Feb. 5, 2019.
Prior Publication US 2022/0126346 A1, Apr. 28, 2022
Int. Cl. B21D 7/022 (2006.01); B21D 7/08 (2006.01); B21D 11/12 (2006.01); B21F 1/00 (2006.01)
CPC B21D 7/022 (2013.01) [B21D 7/08 (2013.01); B21D 11/12 (2013.01); B21F 1/004 (2013.01)] 7 Claims
OG exemplary drawing
 
1. Machine for working bars, suitable for working at least one bar having a mainly oblong development, said machine comprising at least two support sliders, of which at least one is mobile reciprocally toward/away from the other along an axis of movement and each provided with a work plane on which at least one curving unit is installed, suitable to curve at least a longitudinal portion of said bar, and at least a first bending unit, provided with a first contrast element having a first bending radius, and with a first bending element selectively rotatable about said first contrast element to bend said bar around the latter, wherein at least one of said sliders comprises on said work plane at least a second bending unit provided with a second contrast element and a second bending element selectively rotatable about said second contrast element to bend said bar around the latter, said second contrast element having a bending radius different from the first bending radius of said first contrast element, wherein the first and second bending units are fixed in their relative position and only linearly movable with the movement of the respective sliders,
wherein said machine further comprises a drawing unit, installed on at least one of said support sliders, and mobile on said work plane in a direction perpendicular to said axis of movement, configured to draw said bar in the direction of said axis of movement and to draw at least one of said support sliders in the same direction;
wherein said drawing unit comprises drawing rollers disposed aligned in a direction orthogonal to said axis of movement (Z) and defining a variable passage gap between them for the passage of said bar (B) and for the drawing thereof;
wherein said drawing unit is associated with a clamping means able to hold at least a portion of the bar during the bending operation and the clamping means is mobile with the bar on the work plane on a sliding guide such as to guarantee correct positioning of the bar for any curving and bending operation; and
wherein the drawing unit and the clamping means are configured to be movable together on the work plane in said direction perpendicular to said axis of movement so as to bring the bar in correspondence with one of the bending units and guarantee correct positioning of the bar for any curving and bending operation.