Yarn Joining Device Angled Guide Surface Elastic Yarn Alignment
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Solution Overview
Problem
Conventional yarn joining devices fail to correctly join elastic yarns due to expansion and shrinkage issues, leading to misalignment and incomplete joining of core and coating yarns.
Innovation Solution
A yarn joining device with untwisting pipes and a flexure guide member that uses air currents to untwist and twist yarn ends, featuring a guide surface forming an angle with the opening surface to prevent sudden shrinkage and ensure proper alignment of yarns in the twisting chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional yarn joining device with slits in untwisting pipes is used, then the yarn can be held securely and untwisted reliably, but the core yarn of elastic yarn may expand and shrink causing misalignment and failure to guide yarn ends properly into the joining hole
Solution Approach 1:
The device divides the yarn guiding function into separate components: the untwisting pipe handles untwisting while the angled guide surface handles alignment. This segmentation allows each component to optimize its specific function without interference from the other, solving the contradiction between reliable holding and precise alignment.
Solution Approach 2:
The guide surface is positioned at an angle relative to the opening surface, introducing a dimensional aspect that actively guides the yarn end laterally into proper alignment. This angular configuration adds a guiding dimension that was missing in the conventional vertical-only approach, enabling precise alignment while maintaining reliable holding.
2Ease of operation
If the core yarn shrinks, then only the coating yarns are guided to the yarn joining hole whereby the yarn joining of only the coating yarns happens with the core yarns absent
Solution Approach 1:
The angled guide surface creates preliminary alignment and frictional engagement with the yarn end before the yarn enters the joining hole. This preliminary action counteracts the shrinkage tendency of the core yarn, ensuring that even if shrinkage occurs, the yarn remains properly aligned and engaged for complete joining.
Solution Approach 2:
The guide surface acts as an intermediary between the untwisting pipe and the joining hole, providing a transition zone that maintains yarn alignment during the shrinkage process. This intermediary structure ensures that core yarn shrinkage does not result in misalignment or failure to join.
3Manufacturing precision
If the guide surface makes a larger angle with the opening surface, then the yarn end is guided more aggressively, but the frictional force decreases allowing sudden shrinkage
Solution Approach 1:
The patent optimizes the angle parameter of the guide surface relative to the opening surface. By carefully selecting this angular parameter, the design achieves the optimal balance between providing sufficient lateral guidance for alignment and maintaining adequate frictional force to prevent yarn shrinkage. This parameter optimization resolves the contradiction between aggressive guiding and frictional retention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively prevents yarn joining failures by stabilizing the yarn ends and maintaining frictional force against shrinkage, ensuring successful twisting and joining of elastic yarns.
Implementation Method 1
The untwisting pipe is configured as a hollow member and the untwisting pipe untwists a yarn end that entered therein by applying air current to the yarn end
Implementation Method 2
The yarn joining section has an air chamber in which yarn joining of untwisted yarn ends is performed by applying air current to the yarn ends
Implementation Method 3
the yarn can be prevented from suddenly shrinking because of friction at the bending point
Data Source
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AI summary
A yarn joining device (41) includes two untwisting pipes (66), a twisting member (63), and two flexure guide members (81). Each of the untwisting pipes (66) untwists a yarn end that entered therein by applying air current to the yarn end. A swirling chamber (67) that performs yarn joining by applying air current to the untwisted yarn ends is formed in the twisting member (63). A guide surface (83) that guides the yarn end before the yarn end pulled out from the corresponding untwisting pipe (66) arrives at the swirling chamber (67) is formed in each of the flexure guide members (81).