Bi-tapered Spool Design for Wire Braiding Machines
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Solution Overview
Problem
Wire braiding machines experience snagging and breakage due to winding errors and unevenness in wire spools, leading to production disruptions and waste.
Innovation Solution
A bi-tapered spool design with a central cylindrical section and tapered flanges that slope inwardly, providing a progressively widening wire fill area to prevent the buildup of winding defects and ensure smooth payout without tension loss or breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wire is wound onto a conventional cylindrical spool, then the spool can be easily manufactured and is simple in structure, but winding errors and unevenness build up and propagate as the spool fills, causing snagging and breakage
Solution Approach 1:
The spool transitions from a uniform cylindrical shape to a bi-tapered configuration where the flange diameter varies along the axial length. This creates different local geometries: a smaller diameter section at the start for controlled winding entry and a larger diameter section at the end for stable wire storage. This local variation prevents winding defects from propagating by creating a progressively widening wire fill area that accommodates unevenness without causing snagging during payout.
Solution Approach 2:
The spool design changes the geometric parameter of diameter from constant (cylindrical) to variable (bi-tapered). Specifically, the flange diameter increases from the cylindrical section toward the outer end, creating a progressive widening effect. This parameter change allows the wire fill area to expand as the spool fills, preventing the buildup of winding errors while maintaining manufacturing feasibility through standard machining processes.
2Productivity
If the spool is completely filled with wound wire to maximize production capacity, then productivity increases, but winding defects cause snagging and breakage during payout
Solution Approach 1:
The bi-tapered geometry creates optimal local conditions for wire storage throughout the spool length. The progressively widening flange section provides increasing accommodation for wire layers, ensuring that even when the spool is completely filled, the wire maintains even tension during payout without snagging on defects. This allows operators to fill spools to capacity while maintaining reliability.
Solution Approach 2:
The spool geometry is pre-designed to anticipate and prevent winding defect propagation before it occurs. The bi-tapered shape creates a progressively widening wire fill area that naturally accommodates winding variations from the start, preventing the buildup of defects that would otherwise cause snagging during payout and require spool replacement.
3Quantity of substance
If winding defects build up on the spool, then the spool can hold more wire, but the defects propagate and cause snagging and breakage during operation
Solution Approach 1:
The bi-tapered flange geometry creates locally optimized zones for wire storage. The progressively widening section from the cylindrical body to the outer end provides increasing accommodation for wire layers, preventing defect propagation by distributing wire volume evenly throughout the spool length. This allows maximum wire capacity while the geometry itself prevents the harmful buildup of winding defects.
Solution Approach 2:
The design converts the potential harm of winding errors into a benefit by using the bi-tapered geometry to deliberately create a progressively widening wire fill area. This accepts that winding imperfections will occur but designs the spool shape to accommodate and distribute them beneficially, preventing propagation and snagging while maintaining high wire capacity.
Data Source
AI summary
A spool for use in a wire braiding machine, for example, which has a “bi-tapered” design including a central cylindrical section and a pair of tapered (e.g., frusto-conical or parabolic) flanges having surfaces that slope inwardly toward the cylindrical section. In this manner, the spool provides a progressively widening wire fill area, as measured along a direction parallel to the rotational axis of the bobbin, as the wound wire advances progressively radially outwardly from the cylindrical section. This widening wire fill area aids in preventing the formation, propagation and buildup of wire winding defects, such that the wire is more likely to unspool or pay-out from the spool without losing tension, snagging or breaking.