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Jam detection and safety device for jamming machinery.

Authors
Etherton-JR; Powers-JR Jr.; McKenzie-EA Jr.; Means-K; Newbraugh-B
Source
U S Patent 7,493,854 2009 Feb; :1-15
NIOSHTIC No.
20036190
Abstract
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.
Keywords
Machine-operation; Monitoring-systems; Equipment-design; Equipment-reliability
Publication Date
20090224
Document Type
Patent
Fiscal Year
2009
NTIS Accession No.
NTIS Price
NIOSH Division
DSR
Priority Area
Construction; Transportation, Warehousing and Utilities
Source Name
U S Patent 7,493,854
State
WV
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