| 摘要 |
The soft back-up pin 11 is formed of a bottom-side holder portion 12, and a top-side soft pin portion 13 which is held by the holder portion 12 in an exchangeable manner. A ring-shaped background portion 29 which is possible to be distinguished from the soft pin portion 13 and be recognized using image processing is provided on a top end surface of a cylindrical fitting portion 17 which is outside of an outer circumference of the soft pin portion 13 in the holder portion 12 of the soft back-up pin 11. When checking the state of the soft pin portion 13 of the soft back-up pin 11, the soft pin portion 13 of the soft back-up pin 11 and the background portion 29 of an outer circumference thereof are framed in a visual field of a camera 54, an image is captured using the camera 54, the image is processed by an image processing unit 57 to recognize the ring-shaped background portion 29 of the outer circumference of the soft pin portion 13 of the soft back-up pin 11, and thereby recognizes an inner circumferential edge of the background portion 29 as the outer circumferential edge of the soft pin portion 13 of the soft back-up pin 11. |
