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Jam detection and safety device for jamming machinery.
Etherton JR; Powers JR Jr.; McKenzie EA Jr.; Means K; Newbraugh B
US Pat 7,493,854 2009 Feb; :1-15
The present disclosure concerns a jam detection and safety system for machines prone to jamming, such as a baler. In particular embodiments, the system is implemented in a horizontal baler having a shear bar and a hydraulic ram that advances material being baled past the shear bar into a compression chamber. The system includes a strain gage mounted on the shear bar and a controller that is electrically connected to the strain gage. The controller receives strain signals from the stage gage and compares the strain of the shear bar to a predetermined strain threshold corresponding to a jamming condition. If the strain exceeds the predetermined threshold, the controller automatically deactivates the ram, such as by disconnecting line power from the baler and/or by turning off the control power of the baler.
Machine-operation; Monitoring-systems; Equipment-design; Equipment-reliability
Construction; Transportation, Warehousing and Utilities
United States Patent 7,493,854
Page last reviewed: May 20, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division