| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of detecting the slot shape of a slot rod that can continuously measure the reverse angle and twisting pitch of an SZonSZ slot with high accuracy. Ž<P>SOLUTION: Values detected by scanning the rotation angle of the slot with respect to the axial center of the slot rod in a fixed cycle are held, and a value A of a present rotation angle is compared with a value B of a rotation angle scanned before a predetermined time T from the present. Rotation angles before 1/2T from the time when the value B exceeds the value A or is equal to the value A in a process from a state of the value A being continuously larger than the value B until a state of the value A being continuously smaller than the value B, are detected as maximum reversing parts PUA1, PUA2, etc. of the rotation angles. When the compared value shows a reverse large-small tendency, rotation angles before 1/2T from the time when the value A exceeds the value B or is equal to the value B, are detected as the minimum reversing parts PLA1, PLA2 of the rotation angles. The reverse angle and twisting pitch can thereby be continuously measured with high accuracy. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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