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US 5,225,785 AGranted
Apparatus for sensing the thickness of a moving sheet of film
AssigneeModern Controls, Inc.
InventorsDaniel W. Mayer, Roger C. Oestreich
Life of this patent
Estimating the term…
Abstract
A rotatable capacitance sensor preferably constructed of a generally cylindrical body mounted on bearings to a carriage assembly. The body has a number of parallel, spaced apart conductive plates having edges extending through the exterior body surface, and alternate ones of the plates are connected via a bearing to a conductor in one part of the carriage assembly, and the remaining ones of the plates are connected via a bearing to a second conductor in another part of the carriage assembly.
Claims6
An apparatus for measuring thickness of a moving sheet of film material, comprising:
- a) a frame mounted transverse to the direction of movement of said sheet of film material;
- b) a carriage mounted to said frame, said carriage having a pair of spaced apart legs directed toward said sheet of film material;
- c) a rotatable sensor head mounted between said spaced apart legs, said sensor head having a circular cross section contacting said film material, said circular cross section including a plurality of capacitor plates with interleaved dielectric insulators;
- and
- d) means for electrically coupling said capacitor plates to circuits for detecting changes in capacitance caused by changes in relative thickness of said moving sheet of film material.
2 more elements
Dependencies are inferred from the claim text.