Apparatus for defining the location of a foreign object on a rot

Details Apparatus for defining the location of a foreign object on a rot Apparatus for defining the location of a foreign object on a rot

1995-10-05

1998-09-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356237, G01N 2188

Patent

active

058148280

ABSTRACT:
An apparatus for determining the location of a foreign object on a rotary body rotates the body around a horizontally-movable vertical axis. A horizontal displacement detector detects the horizontal displacement of the axis and provides a first signal representing that displacement. An angular position detector detects the angular position of the body and provides a second signal representing that angular position. A lighting system illuminates the body's surface, and a light receiving system receives light that is reflected from the surface. A maximum value of an output signal of the light receiving system is determined to correspond to a representative value of angular position. A position determining section determines the position of the representative value based on the first signal representing the horizontal displacement, the second signal representing angular position, and a clock signal. A foreign object detecting section determines that a representative value exceeding a predetermined level to corresponds to a foreign object.

REFERENCES:
patent: 5377002 (1994-12-01), Malin et al.

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