Anti-dither container counter

Details Anti-dither container counter Anti-dither container counter

1989-08-10

1991-03-26

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Counting animate or inanimate entities

250223B, 377 53, G06M 700

Patent

active

050035630

ABSTRACT:
A first sensor at a first location along a conveyor provides a first signal indicating whether or not a container is present at the first location while a second sensor similarly provides a second signal indicating whether or not a container is present at a second nearby location. The first and second signals are input to a logic circuit which outputs a count pulse only if the the inputs are of a proper form in a proper sequence designed so that dither is ignored. The sensors are diffuse reflection type sensors operating at different frequencies. They are mounted so their sensing axes converge at about a 15 degree angle and the sensor lenses are about 3.5 inches from the point of conveyance. A mounting system allows the sensors to be moved up/down and in/out with respect to the conveyor and maintain a position perpendicular with both the container sidewall and the container flow direction.

REFERENCES:
patent: 3665444 (1972-05-01), Scott
patent: 3955179 (1976-05-01), Planke
patent: 4000400 (1976-12-01), Elder
patent: 4081661 (1978-03-01), Durbin
patent: 4831638 (1989-05-01), Dabby et al.

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