| 摘要 |
PURPOSE:To detect the joint of a beltlike body with high accuracy by boring plural punch holes in the beltlike body on straight line perpendicular to its conveyance direction, detecting them optically, and masking specific areas between the punch holes. CONSTITUTION:The punch holes 2 and 2' which have diameters d1 and d2 are bored at welding points of a thin steel plate 1 at an inside interval L on the straight line perpendicular to the conveyance direction of the steel plate 1. Level values of masking processing are set to alphamm from the rear end of the hole 2 and betamm from the front end of the hole 2', and their interval is set to (l)mm. When an image sensor 3 fixed above the steel plate 1 detects the hole 2, the value alpha and interval (l) are set simultaneously with the rising of the detection signal. When the detection signal of the camera 3 coincides with the set value of the diameter d1 of the hole 2, the masking is started at a point which is alphamm from the rear end of the hole 2 to carry out the masking by the interval (l)mm, and then the signal of the camera 3 is inputted to discrimi nate the presence of the hole 2'. When its detection signal coincides the set value of the diameter d2 and the set value of the interval L, a welding point, i.e. joint is decided.
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