Importance

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Abstract

A Powered Lower Bobbin Feed ('PLBF') system is disclosed for improving the operation of deflector type rotary braiding machines, such as the Wardwell Rapid Braider. The PLBF eliminates or reduces the impulsive tension spikes set up by the deflection and feed process in current rotary braiding machines by uniquely controlling the lower bobbin filament feed. These tension spikes result from: the rapid rotational acceleration and deceleration required of the lower bobbin as a result of the feed process; the lever arm tension control and bobbin ratchet mechanism; and the shape of the filament deflector surface. Such failure limits the operating speed of rotary braiding machines, the minimum size of filament that can be braided effectively, or the ability to maintain the quality of the braid produced. By eliminating or reducing these spikes, the PLBF therefore can increase the working speed of circular braiding machines and improve the uniformity of braided filaments generated by such machines at a given speed. In the preferred embodiment, the PLBF comprises: a slip ring designed to provide power to the lower bobbins; a variable speed powered lower bobbin concept; a feedback control system for the bobbins to assure bobbin feed matches braid consumption; and an improved, more contoured, deflector surface to minimize feed tension spikes. The new contour can be created: by retrofitting existing deflectors with a spline; or, by making new deflectors that incorporate the overall contour of a retrofitted deflector.

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First Claim