Apparatus for detecting the longitudinal edges of a rod-shaped o

Details Apparatus for detecting the longitudinal edges of a rod-shaped o Apparatus for detecting the longitudinal edges of a rod-shaped o

1987-03-05

1988-05-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356386, G01N 2186

Patent

active

047483326

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.

REFERENCES:
patent: 3765774 (1973-08-01), Petrohilos
patent: 3853406 (1974-10-01), Zanoni
patent: 3856411 (1974-12-01), Zanoni
patent: 3905705 (1975-09-01), Petrohilos
patent: 3975102 (1976-08-01), Rosenfeld et al.
patent: 4129358 (1978-12-01), Wei
patent: 4168126 (1979-09-01), Altman et al.
Zyogo Leaflet, "Beruhrungsfreies Laser-Messsystem", (Contactless Laser Measuring System).

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