Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-03-31
1988-06-14
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250224, 209524, 209530, 356428, G01B 1108
Patent
active
047513861
ABSTRACT:
A lean detector comprises a first light source for determining the time of arrival of a container at an inspection site, a second light source for determining the time of arrival of a portion of the container at a predetermined position at the inspection site and a third light source for determining the time of arrival of another portion of the container at another predetermined position at the inspection site. The second and third light sources are perpendicular to each other. A guide rail laterally positions the container at the inspection site. Before real containers are inspected, a non-leaning test container is passed through the inspection site and the times of arrival of the corresponding second and third portions of the test container relative to the time of arrival of the container at the inspection site are determined to serve as reference values. Then, after a real container passes through the inspection site and the times of arrival measured, the reference values are subtracted from the times of arrival of the second and third portions of the real container at the inspection site so that it is not necessary to precisely position the light source relative to each other or relative to the guide rail in order to accurately determine the amount of lean of the real container.
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Emhart Industries Inc.
Samodovitz Arthur J.
Westin Edward P.
Wieland Charles F.
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