Apparatus for measuring length of article transported on conveyo

Details Apparatus for measuring length of article transported on conveyo Apparatus for measuring length of article transported on conveyo

1993-05-20

1994-12-13

Evans, F. L.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250560, G01B 1104

Patent

active

053733630

ABSTRACT:
An apparatus for measuring a length of an article which is transported by a conveyor including first and second light sensors arranged along the conveyor being separated from each other by a reference distance which is similar to a minimum length or an average length of the articles, a rotary encoder secured to a roller of the conveyor ant at least one counter for counting output pulses from the rotary encoder, the counting operation of the counter being controlled by output signals from the first and second light sensors. A length of the article is calculated as a sum of the reference length and a length derived from at least one count value of the counter. The reference length can be predetermined precisely, so that the length of the article can be measured very accurately.

REFERENCES:
patent: 2916633 (1959-12-01), Stone et al.
patent: 3428817 (1969-02-01), Hofmeister et al.
patent: 3682554 (1972-08-01), Flaczynski
patent: 4088411 (1978-05-01), Ahlquist et al.

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