Laminated block correctness determining method

A laminated block correctness determining method for determining whether a laminated block to be laminated is a correct laminated block when manufacturing a laminated iron core by laminating cylindrical laminated blocks, each including laminated iron core pieces, wherein

• the laminated blocks include a laminated block that has a groove formed on an outer circumferential surface of the laminated block and a laminated block that does not have the groove, and
• the laminated block correctness determining method comprises:
• detecting presence or absence of the groove in the laminated block, the detecting presence or absence of the groove includes detecting a position of the groove when detecting the groove;
• and
• determining whether a laminating order of the laminated blocks is correct from a detection result of the detecting presence or absence of the groove,
• wherein, in a state in which the laminating order of the laminated blocks is determined to be correct from the detection result, the laminated blocks are laminated, and
• wherein, in a state in which the laminating order of the laminated blocks is determined to be incorrect from the detection result, the laminated blocks are prevented from being laminated.