Emhart Inc.

Bill O'Connor

James M Bradbury

A rivet setting tool is provided with a cycle control whereby a pressure switch or pressure transducer enables the electronic logic controller to monitor tool hydraulic pressure. When the pressure reaches a predetermined threshold and subsequently drops below a second threshold valve the controller deduces that a rivet has been set and removes pressure from the tool so that the tool can be immediately reset, thus reducing the tools cycle time. Upon determining that a rivet has been set, a mandrel collection window is set. The controller monitors whether a mandrel is returned to the mandrel collection system prior to the expiration of the timed window, and if not, the controller provides a fault signal to the operator. Multiple windows are utilized so that more than one mandrel can be in the return tube at one time without delaying operation of rivet setting system. The pressure sensors can also be utilized to confirm that a rivet has been loaded into the rivet setting tool without the use of a rivet sensor.

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Marstons Mills, MA, United States of America

Bill O'Connor