| 摘要 |
A reliable, fast-acting, web wrap detection system is disclosed which is particularly useful inn an offset printing press for stopping operation thereof quickly enough to prevent the web from wrapping around a blanket cylinder. The preferred detection system includes optical sensors which sense blanket cylinder surface reflectance and which stop printing press operation upon an increase in reflectance, such being indicative that the higher reflectance printing web has begun to wrap the cylinder which occurs when the web breaks.
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