Patent ID: 8915279

Claim:
A rotary lamination apparatus for rotating and laminating core pieces, the apparatus comprising: a die; a punch that descends into an inner space of the die to punch core pieces from a thin plate material mounted on the die; a rotation drive source that intermittently drives and rotates the die about the central axis of the die; a mounting table arranged in the inner space of the die, wherein the core pieces are rotated and laminated on the mounting table; at least one proximity sensor, wherein, when the die has stopped rotating, the proximity sensor detects whether the die is in the proximity of a predetermined position for the die in a non-contact manner; a determining device that determines whether the die is stopped at the predetermined position based on a detection result from the proximity sensor; and a tubular holding member that rotates integrally with the die is arranged on the outer circumference of the die, a die set for rotationally supporting the holding member is located on the outer circumference of the holding member, a recess corresponding to the predetermined position of the die is formed in an outer peripheral surface of the holding member, and the proximity sensor is arranged at a position in the die set facing the outer peripheral surface of the holding member and is configured to detect the recess.