发明名称 |
Method and apparatus for monitoring film thicknesses by sensing magnetic interaction between members movable to a film thickness distance |
摘要 |
An improved method and apparatus for monitoring the thickness of a film includes a sensor roll which cooperates with a compliant roll to form a nip through which the film passes. As the two rolls rotate relative to each other, magnets disposed in the sensor roll are sequentially moved to and from the nip. As a magnet moves by the nip, the field emanating from the magnet is concentrated by a body of material having a relatively high magnetic permeability and disposed in the compliant roll. This results in an induced voltage being generated in a sensor coil. The output from the sensor coil is transmitted to control circuitry which effects operation of a suitable apparatus to control the thickness of the film.
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申请公布号 |
US4767987(A) |
申请公布日期 |
1988.08.30 |
申请号 |
US19860938047 |
申请日期 |
1986.12.04 |
申请人 |
HARRIS GRAPHICS CORPORATION |
发明人 |
MONTGOMERY, ROBERT M. |
分类号 |
G01R33/12;(IPC1-7):G01B7/10 |
主分类号 |
G01R33/12 |
代理机构 |
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主权项 |
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地址 |
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