Title: Lubricating apparatus for conveyor chains

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Abstract: An apparatus for lubricating a chain has a follower bar which rides the rollers between the rows of chain links on each side of the chain, and accordingly maintains a predetermined lateral position with respect to the chain. Oil nozzles are carried by the follower bar and are directed toward the links. The nozzles are supplied with oil from a pneumatically operated ejector which is controlled by a fluidic control device including an air jet and a fluidic sensing unit aligned with the jet. The chain passes between the nozzle and the fluidic sensing unit and is positioned such that the rollers in it periodically interrupt or disperse the air jet so that the air jet at one instant passes through the chain and impinges on the sensing unit and at another instant is dispersed by a roller. The restoration of the air jet after it is dispersed is sensed by the sensing unit which directs a signal to the ejector, causing the ejector to discharge a metered amount of oil each time a roller passes through the air jet. The oil nozzles are positioned such that the oil so delivered flows onto the chain at locations where adjacent links in each row are joined.


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