发明名称 |
Web defect monitor for abrupt changes in web density |
摘要 |
An electro-optical scanner for detecting variations in a web and generating output signals representative of the variations is provided with discriminator logic and alarm circuitry that indicates when the output signals shift from a value exceeding a predetermined positive (negative) threshold value to a value beyond a predetermined negative (positive) threshold value within a prescribed minimum period of time as an occurrence of an abrupt change in web density and processing circuitry for determining and indicating when the number of such occurrences per unit time exceeds a threshold or predetermined number.
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申请公布号 |
US4011457(A) |
申请公布日期 |
1977.03.08 |
申请号 |
US19750602465 |
申请日期 |
1975.08.06 |
申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
WOLF, WILLIAM EDWARD |
分类号 |
G01N21/89;(IPC1-7):G01N21/32 |
主分类号 |
G01N21/89 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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