| 摘要 |
PURPOSE:To immediately change a projecting system in a sheet defect detecting device in the case of changing a band sheet which is an inspecting target from a transparent material to an opaque material in the same device, or conversely changing it. CONSTITUTION:A lower lighting device 15 is provided between first and second guide rollers 24, 29 in such a manner as to be capable of being raised and lowered by a first cylinder 18. The first guide roller 24 is supported on the upper end parts of a pair of first arms 21 the lower end parts of which are pivotally mounted on a machine base 1, and the pair of the fist arms 21 are made rotatable by a second cylinder 25. The second guide roller 29 is supported on the upper end parts of a pair of second arms 32 the center parts of which are pivotally mounted on the machine base 1, and the pair of the second arms 32 are energized by a tension spring 34 in the direction of mutually approaching both the guide rollers 24, 29. |
