Dynamoelectric machine laminated core mfg. appts. - punches projection in sheet which is then blanked out over blanked sheet to form interlocking structure

摘要

Apertured laminations are provided with projections formed from the portion of the sheet from which the apertures are formed to define an interlocked laminated stack. The first of the laminations is provided with a through aperture with the projection being eliminated so as to define a non-projecting surface in the first of the laminations of the stack. The projections of each of the subsequent laminations extend into and are interlocked with the preceding lamination in its aperture. The punching apparatus for providing the apertures and projections is selectively operated to define either the formed aperture and projection structure or a blanked out apertured structure.