Narrow Fabric Weaving Bridge Section for Stiff Central Area
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Solution Overview
Problem
Existing methods for producing technical narrow fabrics, such as safety belts, often result in webbing stiffness issues due to transverse rigidity, requiring expensive devices and complex methods to achieve the necessary material distribution.
Innovation Solution
A method and device for weaving technical narrow fabrics using a weft needle to form a bridge section with a main weft thread, allowing a trailing weft thread to be inserted without additional guide needles, creating a stiffer central area while maintaining soft edge areas for comfort and increased transverse rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional devices such as guide needles are used to insert multiple weft threads, then the transverse rigidity and material distribution can be improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple weft threads into a single integrated structure. The main weft thread forms a bridge section that carries the trailing weft thread, allowing both threads to be inserted through a single weft needle rather than requiring separate guide needles for each thread. This merging approach achieves the desired material distribution and transverse rigidity while significantly reducing device complexity
Solution Approach 2:
The bridge section of the main weft thread acts as an intermediary carrier for the trailing weft thread. By forming this bridge section that extends beyond the fabric edge, the main weft thread mediates the insertion and positioning of the trailing weft thread without requiring additional guide needles, thus resolving the contradiction between achieving proper material distribution and maintaining simple device structure
2Stability of the object's composition
If multiple different materials are used as weft threads to increase transverse rigidity stability, then the fabric performance is improved, but the manufacturing process becomes more complex and expensive
Solution Approach 1:
The patent applies local quality by creating different fabric characteristics in different regions. The central area contains both the main weft thread and trailing weft thread for enhanced transverse rigidity, while the edge areas contain only the main weft thread for softness and comfort. This localized differentiation achieves stable transverse rigidity where needed without complicating the overall manufacturing process
Solution Approach 2:
The bridge section of the main weft thread is formed in advance during the weaving process, creating a predetermined structure that automatically guides the trailing weft thread to the correct position. This preliminary formation of the bridge section simplifies subsequent manufacturing steps by eliminating the need for additional guide needles or complex positioning mechanisms
Data Source
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AI summary
The method involves forming a cloth by a warp thread (20) and main and towing weft threads (21, 22) that are inserted using a weft needle (11). The main weft thread is guided through the weft needle for forming a bridge section (23) that guides the towing weft thread. The bridge section is formed between upper and lower weft needles (12, 13). The towing weft thread is provided with pre-definable length that is equal to or smaller than the width of a narrow fabric (1). The main weft thread is inserted in a main weft section (24) whose length is equal to the width of the fabric. Independent claims are also included for the following: (1) a narrow fabric comprising a cloth (2) a device for weaving machine for producing a narrow fabric, comprising a weft needle.