Measuring and testing – Speed – velocity – or acceleration – Fluid
Patent
1989-10-02
1990-11-13
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Fluid
73 377, G01P 326
Patent
active
049693603
ABSTRACT:
A system for determining the rotational, or cyclic, speed and rotational position of a looped traveling belt, such as a felt in a papermaking machine, utilizes a discontinuity, or caliper variation, in the surface of the belt near one edge thereof. A fluid stream, such as compressed air, is projected against the web along the annnular area containing the discontinuity, and a pressure transducer is mounted to fixed proximity with the belt downstream of, and aligned with, the fluid stream. The transducer senses differences in the pressure of the fluid stream projected against the belt and against the discontinuity, and produces a signal indicative of the passage of the discontinuity past the transducer. The time interval of this signal is used to compute the cyclic speed of the traveling belt and to identify the part of the belt passing through a nipped roll couple at another location.
REFERENCES:
patent: 2786978 (1957-03-01), Warner
patent: 2919673 (1960-01-01), Williams et al.
patent: 3754471 (1972-08-01), Hohenberg
patent: 4602510 (1986-07-01), Mon
patent: 4652736 (1987-03-01), Osterberg
patent: 4848632 (1989-07-01), Mack et al.
Beloit Corporation
Campbell Raymond W.
Mathews Gerald A.
Roskos Joseph W.
Veneman Dirk J.
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