Package height detector having a first group of light sensors se

Details Package height detector having a first group of light sensors se Package height detector having a first group of light sensors se

1992-04-14

1993-11-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01N 2186, G01V 904

Patent

active

052668100

ABSTRACT:
A dimensional detector useful for determining the height of a package as it moves along a conveyor, comprising a light source and corresponding light sensors oppositely disposed across the conveyor, wherein the light is interrupted by the package before being received by the light sensors. Rapid determination of the package height is provided by grouping the light sensors into groups of contiguously disposed light sensors and a group of light sensors interspersed between the contiguously disposed light sensor groups. Included within the group having interspersed light sensors is also a group of contiguously disposed light sensors which are located at the lowest end of the dimension to be measured. According to the invention, the group of light detectors comprising the interspersed light detectors and the lowest dimensional disposed contiguous detectors is first read to determine if the package height is within the lowest dimensional disposed contiguous detector. If not, one of the remaining groups of contiguous light detectors is read, according to the signals from the interspersed light detectors. In this manner, the package height is rapidly determined often with only one group reading, but never more than two group readings.

REFERENCES:
patent: 2299798 (1942-10-01), Colson et al.
patent: 3566135 (1971-02-01), Mouchart
patent: 3727069 (1973-04-01), Crittenden, Jr. et al.
patent: 4192613 (1980-03-01), Hammar
patent: 4266124 (1981-05-01), Weber et al.
patent: 4590410 (1986-05-01), Jonsson
patent: 5130532 (1992-07-01), Clemens

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