3D Weaving Selvedge Structure for Weft Blocking Without Jamming
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Solution Overview
Problem
Existing Jacquard-type weaving looms face issues with weft yarns not being properly blocked at the edges of the texture, leading to misalignment, ripples, and jamming during the weaving process, especially in three-dimensional weaving with varying yarn densities between selvedge and central parts.
Innovation Solution
A method for three-dimensional weaving that involves interlinking weft yarns in groups within selvedges using primary and secondary weaving planes, with warp yarns aligned along the longitudinal direction to ensure proper blocking and reduce yarn density, eliminating the need for templets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual interlinking of weft yarns with selvedge warp yarns is used to ensure blocking, then weft yarn blocking is improved, but yarn density in selvedge areas becomes excessively high causing ripples and jamming
Solution Approach 1:
The patent merges multiple individual interlinkings into a single group interlinking operation where several weft yarns are interlinked simultaneously by multiple warp yarns in one action. This maintains effective blocking while distributing the density increase across multiple yarns rather than concentrating it on individual weft yarns, preventing localized ripple formation and jamming.
Solution Approach 2:
The patent transitions from individual one-to-one interlinking to multi-to-many group interlinking, effectively adding a dimensional aspect to the interlinking process. By interlinking multiple weft yarns simultaneously in parallel, the system achieves better blocking efficiency without proportionally increasing local yarn density, thus avoiding ripples and jamming.
2Manufacturing precision
If dense interlinking of weft yarns with selvedge warp yarns is used to ensure blocking, then weft yarn placement accuracy is improved, but misalignment between selvedge areas and central part occurs during weaving
Solution Approach 1:
The patent combines multiple weft yarns into groups that are interlinked simultaneously, creating a more rigid and stable selvedge structure. This group interlinking maintains alignment consistency across the selvedge areas and central part by distributing the alignment constraint across multiple yarns rather than relying on individual yarn positioning, preventing misalignment during weaving.
3Reliability
If individual warping of each weft yarn is implemented to ensure blocking, then weft yarn control is improved, but device complexity increases due to additional templets and guiding systems
Solution Approach 1:
The patent merges the control function into the existing warp yarns themselves, which naturally guide and constrain the weft yarns during insertion. By using the warp yarns' inherent structural role to provide blocking and alignment, the system eliminates the need for separate templets and guiding systems, reducing device complexity while maintaining reliable weft yarn control.
Data Source
AI summary
A method for three-dimensionally weaving a texture between a plurality of warp yarns extending along a longitudinal direction and a plurality of columns of weft yarns, the weft yarns extending along a transverse direction, the texture including a central part extending along the transverse direction between a first selvedge and a second selvedge, wherein at least one of the selvedge includes at least one primary weaving plane perpendicular to the transverse direction in which the weft yarns derived from the same column of weft yarns of the central part of the texture are group-interlinked, the weft yarns of the same group being aligned along the longitudinal direction.