Method and device for manufacturing laminated iron core

A method of manufacturing a laminated iron core, the method comprising:

• inserting a plurality of electrical steel strips in a superposed state to feed rolls including a pair of upper and lower feed rolls that are driven by a drive device to feed the electrical steel strips in a superposed state into a die having a plurality of punching processes in sequence;
• joining a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die after feeding out the electrical steel strips from the pair of upper and lower feed rolls;
• and
• punching simultaneously the plurality of electrical steel strips in a superposed state in the die.

A manufacturing apparatus for manufacturing a laminated iron core, comprising:

• feed rolls including a pair of upper and lower feed rolls;
• a die having a plurality of punching processes and configured to simultaneously punch the plurality of electrical steel strips in a superposed state;
• a first device configured to insert a plurality of electrical steel strips in the superposed state to the pair of upper and lower feed rolls such that the electrical steel strips in the superposed state;
• a second device configured to join a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die;
• and
• a drive device that drives the pair of upper and lower feed rolls.