Measuring and testing – Dynamometers – Responsive to force
Patent
1990-03-01
1991-09-17
Noland, Tom
Measuring and testing
Dynamometers
Responsive to force
73159, 7386204, G01L 118, G01L 500
Patent
active
050483536
ABSTRACT:
A pressure sensitive device, such as a piezoelectric strip or plurality of piezoelectric crystals, is or are arrayed along the surface of a roll, preferably in a spiral pattern, extending for one revolution of the roll which is nipped with another roll. The nip pressure between the rolls, with or without a paper web passing through the nip, produces a signal by the piezoelectric device indicative of irregularities along the nip. These irregularities, which can be indicative of variations in the web caliper, roll surface, hardness and other parameters of roll or web quality, are then passed to a monitor for continuous read-out of the irregularities or non-uniformities along the face of the roll. Other apparatus, such as a signal conditioner and a signal encoder, can be provided for processing the signals determining the exact axial location along the roll surface of the pressure sensitive device passing through the nip at any given time.
REFERENCES:
patent: 3194061 (1965-07-01), Sorenson et al.
patent: 3363458 (1968-01-01), Scharf et al.
patent: 3425267 (1969-02-01), Pfeiffer
patent: 3451258 (1969-06-01), Westbrook
patent: 3540270 (1970-11-01), Wolfer
patent: 3962911 (1976-06-01), Grenlund
patent: 4016756 (1977-04-01), Kunkle
Clayton, executrix Katherine J.
Justus, deceased Edgar J.
Beloit Corporation
Campbell Raymond W.
Mathews Gerald A.
Noland Tom
Veneman Dirk J.
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