Apparatus for detecting the longitudinal edges of a rod-shaped object
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United States of America Patent
Stats
-
May 31, 1988
Grant Date -
N/A
app pub date -
Mar 5, 1987
filing date -
Mar 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for detecting the longitudinal edges of a rod-shaped object moving in its longitudinal direction, in particular a tobacco or filter rod, comprises a light source, at least one beam divider for dividing the light beam coming from the light source into at least two light beams sweeping over the edge regions of the object, an optical deflection system for sweeping the two light beams over the object, two photodetectors for the light beams and an evaluating means for determining the position of the longitudinal edges from the instants of the bright/dark transitions at the two photodetectors on the one hand and the instantaneous positions of the light beams on the other hand. The or each beam divider generates two light beams which are parallel to each other and move in opposite directions over the object.
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