Patent ID: 7870661

Claim:
A die machine for manufacturing a laminated iron core comprising: a first working row for punching out iron core pieces having a given configuration from a steel sheet material, each of said iron core pieces including a spindle hole and plurality of slot holes; a second working row for punching out electrically insulating sheet pieces from an electrically insulating synthetic resin sheet material, each of said electrically insulating sheet pieces including a spindle hole and a plurality of slot holes which have a substantially similar configuration to said slot holes of the iron core pieces but have a smaller size than said slot holes of the iron core pieces; and a stacking die mold arranged movably between said first and second working rows for selectively receiving said iron core pieces and electrically insulating sheet pieces such that successive stacks of a given number of iron core pieces are sandwiched between said electrically insulating sheet pieces; wherein: said stacking die mold includes first and second stacking dies and a driving unit for rotating said stacking die mold such that each of said first and second stacking dies are indexed at each of punching out and stacking positions in the first and second working rows; said first working row includes at least a spindle hole punching station for forming a spindle hole in the steel sheet material at a given position, a slot hole punching station for forming slot holes in the steel sheet material around the spindle hole, and a punching out and stacking station for punching out an iron core piece from the steel sheet material and stacking the punched out iron core piece into the stacking die indexed at the punching out and stacking position in the first working row; and said second working row includes at least a spindle hole punching station for forming a spindle hole in the electrically insulating synthetic resin sheet material at a given position, a slot hole punching station for forming slot holes in the electrically insulating synthetic resin sheet material around the spindle hole, and a punching out and stacking station for punching out an electrically insulating sheet piece from the electrically insulating synthetic resin sheet material and stacking the punched out electrically insulating sheet piece into the stacking die indexed at the punching out and stacking position in the second working row.