Yarn Winding Traverse Control for Smooth Lateral Unwinding
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Solution Overview
Problem
Existing winding apparatuses face issues with unfavorable unwinding during lateral unwinding due to irregular winding states and friction between yarns, leading to inefficient and potentially tangled unwinding processes.
Innovation Solution
A winding apparatus that reciprocates yarn traversed in the shaft direction of a bobbin, adjusting the speed and position of the traversing fulcrum guide to ensure equal winding tensions and reduce friction, forming a package that minimizes unfavorable unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traverse guide reciprocates at equal speeds in both directions, then the winding process is simple and symmetric, but the yarn creates irregular winding states that cause unfavorable unwinding and friction during lateral unwinding
Solution Approach 1:
The patent applies asymmetry by making the traverse speeds in the two directions unequal. Specifically, the traverse guide moves slower in one direction (second direction) than in the other direction (first direction). This asymmetric speed configuration creates a specific winding pattern where yarn layers are deposited at different angles, reducing friction during lateral unwinding and preventing unfavorable unwinding phenomena.
Solution Approach 2:
The patent changes the speed parameter of the traverse guide to resolve the contradiction. By adjusting the traverse speeds in opposite directions to be unequal (v1 ≠ v2), the system achieves optimal winding characteristics for lateral unwinding. The speed ratio and individual speed values are controlled to create the desired winding state that minimizes friction and prevents yarn catching during unwinding.
2Reliability
If the traversing fulcrum guide is positioned at the center of the winding range, then the winding is symmetric, but the different winding lengths in each traverse direction cause unequal winding tensions that degrade the package and cause unfavorable unwinding
Solution Approach 1:
The patent applies asymmetry by offsetting the traversing fulcrum guide from the center position of the winding range. The fulcrum guide is positioned at a specific offset distance toward one side, which compensates for the unequal traverse speeds. This asymmetric positioning ensures that the effective winding lengths in both traverse directions become equal, thereby equalizing the winding tensions and preventing package degradation and unfavorable unwinding.
Solution Approach 2:
The patent changes the position parameter of the traversing fulcrum guide to resolve the contradiction. By adjusting the offset distance of the fulcrum guide from the center, the system equalizes the winding lengths in opposite traverse directions. This positional adjustment, combined with unequal traverse speeds, achieves equal winding tensions throughout the package, ensuring reliable unwinding properties.
3Stability of the object's composition
If the yarn is wound with high friction between layers, then the package structure is stable, but lateral unwinding causes unfavorable unwinding and yarn catching
Solution Approach 1:
The patent applies asymmetry in the winding pattern by using unequal traverse speeds and an offset fulcrum guide position. This creates a specific layered structure where yarns are deposited at controlled angles, reducing the friction coefficient between adjacent yarn layers. The asymmetric winding configuration ensures that during lateral unwinding, the yarns can slide past each other more easily, preventing catching and unfavorable unwinding while maintaining package integrity.
Solution Approach 2:
The patent changes the winding parameters (traverse speeds and fulcrum position) to optimize the friction characteristics of the package structure. By controlling the speed ratio and offset distance, the system creates a winding pattern with reduced inter-layer friction, enabling smooth lateral unwinding while preserving the structural stability of the formed package.
Data Source
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AI summary
Winding apparatus forming a package capable of lateral unwinding without unfavorable unwinding occurring. A winding apparatus 1 winds a yarn Y traversed in a shaft direction of a bobbin Bw onto the bobbin Bw to form a yarn supply package Ps. The winding apparatus 1 includes: a rotating unit 10 configured to rotate the bobbin Bw; a traversing fulcrum guide 23; and a traverse device 24 configured to reciprocate a traverse guide 241 along the shaft direction and to traverse the yarn Y with the traversing fulcrum guide 23 as a fulcrum. During a midway process from a start of the winding of the yarn Y onto the bobbin Bw to an end of the winding, the traversing fulcrum guide 23 is disposed on a first direction side from a winding center, and the traverse guide 241 is reciprocated so that a speed to a second direction side is slower than a speed to the first direction side.