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US 4,929,895 AGranted
Thickness gauge for moving sheet material with inner and outer flexibly mounted bearings
AssigneeImpact Systems, Inc.
InventorPekka M. Typpo
Life of this patent
Estimating the term…
Abstract
A caliper gauge for relatively thin moving sheet material is provided by the use of an outer ring type air bearing, flexibly supported, which is flexibly connected again to an inner air bearing carrying the magnetic measuring components. The outer air bearing (with its juxtaposed mate) tends to flatten the sheet so that minimum movement is required of the independently actuated inner air bearing. Thus, great accuracy is achieved and tearing or marking of the sheet material, such as super calendered or coated grades of paper, is avoided.
Claims8
A thickness gauge for moving sheet material comprising:
- first and second magnetic circuit means juxtaposed on opposite sides of said sheet indicative of the thickness of said sheet;
- upper and lower means on opposite sides of said sheet for respectively flexibly carrying said first and second magnetic circuit means, each of said upper and lower means including:
- outer bearing means including an outer rigid ring with a plurality of spaced air exit means around the circumference of such outer ring for providing an air bearing between said ring and said sheet;
- means for flexibly causing said outer ring to move toward engagement with said sheet, said opposed outer rings of said upper and lower means tending to flatten a portion of said sheet encompassed by said rings;
- rigid inner disk-like bearing means respectively carrying said first and second magnetic circuit means;
- means for flexibly connecting said inner disk-like bearing means to said rigid ring of said outer bearing means to place them in substantially the same plane;
- and means for flexibly causing said inner bearing means to move said magnetic circuit means toward engagement with said sheet.
4 more elements
Dependencies are inferred from the claim text.