Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-09-07
1990-09-04
Fields, Carolyn E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2503591, 250559, 378 55, 378 89, 356386, 33701, 264 401, G01N 2186
Patent
active
049547194
ABSTRACT:
A sheet thickness gauging system locates sheet edges to measure sheet width and to calibrate the gauging procedure to take into account neck-in or lateral shifting of the sheet. Initially, and at regular intervals during extrusion, the controller, motor, and motor control that cooperate to control a nuclear gauge's movement and measurement on a traverse across the path of movement of the sheet, rapidly move the gauge to a first position near a first edge of the sheet. From that position to the edge the gauge steps in small steps until a substantial reduction in apparent thickness is detected, signifying the location of the edge. A limit to the regular transverse gauging movement of the gauge is set just inward of the detected first edge. The gauge is then moved rapidly across the sheet to a second position near the other edge of the sheet, where the system proceeds similarly to detect the second edge and set a second limit. Regular gauging then proceeds, across the sheet from one limit to other.
REFERENCES:
patent: 3307215 (1967-03-01), Gerhard et al.
patent: 3518431 (1970-06-01), Rowe
patent: 3840302 (1974-10-01), Brunton et al.
patent: 4393313 (1983-07-01), Calkins et al.
patent: 4454084 (1984-06-01), Smith et al.
patent: 4542297 (1985-09-01), Hold
patent: 4559452 (1985-12-01), Igaki et al.
patent: 4734922 (1988-03-01), Harris
Harrel, Inc.'s Technical Data Sheet, TDS-250 entitled "TG Series Nuclear Thickness Gauges".
Harrel, Inc.'s Technical Data Sheet, TDS-245B entitled "SC-600 Series Digipanel Sheet Thickness Controller".
Holton E. Harris, "Computerized Control of Sheet Thickness Makes Extrusion More Profitable," Plastics Design and Processing, Feb. 1975.
Fields Carolyn E.
Harrel, Inc.
Porta David P.
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