| 摘要 |
A method for detecting both separated and non-separated edge cracks on a travelling product, such as a continuous paper web, and the like, and an apparatus for performing the invented method. The method includes directing air onto a travelling product with sufficient force to separate non-separated edge cracks and utilizing an optical signal device to detect edge cracks in the travelling product. A preferred embodiment of the method includes directing two streams of air toward opposite surfaces of the travelling product to effectively separate the non-separated edge cracks and orienting the optical device so that the direction of emitted optical signals forms an angle other than a right angle with the direction in which the product is travelling. The air used to separate the non-separated cracks is also directed across the optical signal device to prevent the build-up of foreign particles, thus improving the integrity of the method. The method also involves automatically tracking the edge of the travelling product and moving the optical sensing device along with the edge of the travelling product so that the optical signal device is continuously positioned at a predetermined distance from the edge of the product. An apparatus for performing the invented method includes an air-purged housing which forms an air delivery opening, and an optical sensor located within the air-purged housing which directs optical signals through the air delivery opening.
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