Jacquard Heddle Loop Structure for Bending Wear Resistance
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Solution Overview
Problem
Existing Jacquard heddles are prone to breaking and premature wear due to bending stresses and are not suitable for thick warp threads, especially in corrosive environments, leading to misalignment and increased wear.
Innovation Solution
A Jacquard heddle design featuring a link with circular holes and loops for upper and lower wires, allowing pivoting without stress at connections, and using single-filament wires with circular sections to reduce bending stress and prevent jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the heddle uses traditional twisted links or welded wire connections to connect the warp thread to the harness, then the connection strength is improved, but the heddle becomes prone to breaking and premature wear when bent during operation
Solution Approach 1:
The patent applies the dynamics principle by allowing the link to pivot freely within the loops of the wire bodies. This dynamic configuration enables the connection to adapt to bending stresses during heddle operation, preventing stress concentration at fixed connection points. The link can rotate and adjust its position, transforming the rigid connection into a flexible, stress-absorbing joint that resists breaking and wear.
Solution Approach 2:
The patent changes the connection parameter from fixed rigid connections (twisted links or welded wires) to a movable pivoting connection. By allowing rotational movement and changing the structural parameter from rigid to flexible, the design accommodates bending stresses without causing failure, thereby improving reliability while maintaining connection strength.
2Strength
If the heddle uses thick warp threads for robust fabric production, then the fabric strength is improved, but the heddle links are carried along and bent, causing misalignment and increased wear
Solution Approach 1:
The dynamic pivoting mechanism allows the link to adjust its position freely within the loops when thick warp threads apply bending forces. This prevents the link from being carried along and misaligned, as it can rotate to accommodate the bending motion, thereby maintaining proper alignment and reducing wear even with thick warp threads.
Solution Approach 2:
By changing the connection from rigid to flexible with pivoting capability, the system can handle thick warp threads without suffering from misalignment issues. The parameter change allows the heddle to maintain reliability and proper alignment regardless of the warp thread thickness used for fabric production.
3Ease of manufacture
If the heddle uses twisted yarn connections to attach wires to the link, then the manufacturing simplicity is improved, but the twists are strongly stressed during bending, causing incipient breaking and premature wear
Solution Approach 1:
The patent replaces the static twisted yarn connection with a dynamic pivoting wire connection. The wire passes through the link and forms loops that allow free rotation, eliminating the stress concentration on twisted yarns. This dynamic connection method is both manufacturable and highly reliable, as it prevents incipient breaking during bending operations.
Solution Approach 2:
The connection parameter changes from twisted yarn (flexible but stress-prone) to a rigid wire with pivoting loops (flexible through rotation). This parameter change maintains ease of manufacture while dramatically improving the durability of the connection under bending stresses.
4Strength
If the heddle uses welded connections between wire and link, then the connection strength is improved, but the welding points are strongly stressed during bending, causing breaking
Solution Approach 1:
The patent replaces the rigid welded connection with a dynamic pivoting connection where the wire passes through the link and forms loops. This eliminates stress concentration at fixed welding points, allowing the connection to absorb bending stresses through rotation rather than relying on the strength of the weld joint, thereby preventing breaking.
Solution Approach 2:
The connection parameter changes from a fixed rigid welded joint to a flexible pivoting joint. This parameter change maintains connection strength while improving reliability under bending conditions by allowing movement that prevents stress concentration at the connection point.
Data Source
AI summary
A Jacquard heddle including a link, including an upper hole and a lower hole of circular cross-section. A first single-filament wire is engaged in the upper hole forming an upper loop and a second single-filament wire is engaged in the lower hole forming a lower loop. The Jacquard heddle includes an upper end connector to which two end portions of the first wire are linked and a lower end connector to which two end portions of the second wire are linked. The upper loop defines a free opening extending from the upper hole to the connection of the two end portions of the first wire with the upper end connector. The lower loop defines a free opening extending from the lower hole to the connection of the two end portions of the second wire with the lower end connector.