US 12,406,803 B2
Method for the production of sheet cores, gripping system for stacks of sheets and plant for the production of sheet cores
Damiano Costa, Lugo (IT); and Riccardo Bedeschi, Lugo (IT)
Assigned to L.A.E. LUGHESE ATTREZZATURE PER L'ELETTROMECCANICA S.R.L., (IT)
Appl. No. 17/800,249
Filed by L.A.E. LUGHESE ATTREZZATURE PER L'ELETTROMECCANICA S.R.L., Lugo (IT)
PCT Filed Feb. 25, 2021, PCT No. PCT/IB2021/051577
§ 371(c)(1), (2) Date Aug. 17, 2022,
PCT Pub. No. WO2021/171217, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 102020000003880 (IT), filed on Feb. 25, 2020.
Prior Publication US 2023/0063429 A1, Mar. 2, 2023
Int. Cl. H01F 7/06 (2006.01); B65G 47/92 (2006.01); H01F 41/02 (2006.01)
CPC H01F 41/0233 (2013.01) [B65G 47/92 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for a production of stacked sheet cores for transformers by means of stacks of sheets; the method comprising the steps of:
providing a stack of sheets comprising one or more sheets made of grain oriented electrical steel;
grabbing said stack of sheets by a gripping system; and
placing the stack of sheets on an assembly table,
wherein during the step of placing, the stack of sheets falls in free fall along a path;
wherein the gripping system comprises electromagnetic elements configured to selectively produce an electromagnetic field suited to attract, in use, the stack of sheets and support elements configured to support the stack of sheets; wherein, during the step of grabbing, the electromagnetic elements are activated to attract the stack of sheets; and
wherein, during the step of placing, the support elements are interposed between the stack of sheets and the assembly table; wherein the step of placing comprises to disconnect the electromagnetic elements so that the stack of sheets falls in free fall onto said support elements.