Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-05-01
1997-03-25
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2505594, 25055947, 377 8, 377 53, G01V 904
Patent
active
056147090
ABSTRACT:
A method for counting conveyed workpieces, such as on a variable speed conveyor belt, includes sensing interruptions via an object sensor such as an optical sensor with a light beam, and with a computer, applying a mathematical comparison between duration of interruptions to the light beam path and gaps that separate these interruptions. The comparison determines which interruptions are caused by the passage of conveyed workpieces and which interruptions are caused by the passage of other objects such as components of the conveyor belt. The method described involves the selection of a preset factor used in a ratio comparison between the duration of interruptions to the light beam and the gaps that separate these interruptions such that the computer is able to accurately count objects such as sheets of paper pulled by gripper bars and distinguishing between sheets of paper and gripper bars such that gripper bars and clips are not incorrectly counted as sheets of paper. Accuracy is not compromised by changes in speed of the conveyor. The gripper bars are fully filtered from the product count value.
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Allen Stephone
Freiburger Thomas M.
Golden Gate Microsystems, Inc.
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