Edge sensor for a moving strip of material
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United States of America Patent
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-
Nov 24, 1992
Grant Date -
N/A
app pub date -
Apr 16, 1991
filing date -
Aug 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An edge sensor for a moving web of material includes an elongated light source on which is mounted a receiver containing an active receiver element made of a plastics material with light-absorbing properties. The receiver element comprises an elongated light input surface and at least one light exist on which a light detector is provided. The receiver element is an elongated hollow body made of a light-absorbing plastics material which is supported directly in the receiver in such a way that is light input surface is directly exposed to the light from the light source which falls on the web. A hollow body which is, or can be made, self-supporting directly and without accessories results in a simpler structure and optimal use of light. The hollow body is particularly suitable for use in the tube supports of a standard commercial fluorescent tube housing.
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