Yarn Winding Device Yarn Pool Length Control
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Solution Overview
Problem
Existing yarn winding devices face challenges in accurately measuring yarn length, leading to wasteful yarn disposal due to variations in yarn length among packages, and require complex calculations or are inefficient in controlling yarn speed and length, especially with cone and cheese winding packages.
Innovation Solution
A yarn winding device with a yarn pool section, yarn accumulation driving section, and count section that accumulates and counts the yarn before winding, allowing for accurate calculation of yarn length based on driving amounts, independent of package winding operations, and includes a yarn splicing device for precise length calculation during splicing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If yarn length is measured by direct sensing with measuring head and travel time correlater, then yarn length can be accurately determined, but device complexity and costs increase
Solution Approach 1:
The patent introduces an intermediate yarn accumulation device as a mediator between the yarn supply and the package winding. This device accumulates yarn in a pool and supplies it to the package, allowing length measurement through simple rotation counting of the accumulation device rather than complex direct sensing. The intermediary device decouples the measurement function from the winding function, simplifying the overall system.
Solution Approach 2:
The patent replaces the optical/electronic measurement system (measuring head with sensors and travel time correlater) with a mechanical counting system. The yarn accumulation device's rotation is counted mechanically or electronically to determine yarn length, substituting complex sensor-based measurement with simpler rotation-based measurement.
2Ease of operation
If yarn length is controlled based on winding drum rotation, then winding operation is simplified, but yarn length accuracy deteriorates due to varying yarn speed
Solution Approach 1:
The patent segments the winding system into two independent parts: the yarn accumulation device and the package winding drum. The accumulation device handles yarn supply and length measurement, while the drum handles package formation. This segmentation allows independent optimization of each function, with the accumulation device ensuring accurate yarn length control regardless of drum rotation variations.
Solution Approach 2:
The yarn is accumulated in advance in the yarn pool before being supplied to the package. This preliminary accumulation allows the system to measure and control yarn length before the actual winding occurs, ensuring accurate length control independent of the winding drum's rotation speed variations.
3Productivity
If package winding is performed with varying yarn length, then productivity is maintained, but wasteful yarn disposal increases
Solution Approach 1:
The patent implements a feedback mechanism where the rotation amount of the yarn accumulation device is continuously counted and used to control the winding operation. The system monitors the accumulated yarn length and adjusts the winding process accordingly, ensuring that yarn of precise length is supplied to each package, thereby eliminating waste from over-winding while maintaining productivity.
Data Source
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AI summary
A winding unit 10 in an automatic winder is configured to wind a predetermined length of yarn 20 into a package 30. The winding unit 10 includes a yarn pool section 71, a servo motor 55, and a yarn length control section 90. The yarn pool section 71 accumulates that the yarn before being wound into the package 30. The servo motor 55 is driven to supply the yarn to the yarn pool section 71. The yarn length control section 90 allows a supply count section 91 to count a forward rotation pulse signal from the servo motor 55 so that the predetermined length of yarn is wound into the package 30. Then, based on the count value in the forward rotation pulse signal, the length of the yarn wound into the package 30 is calculated (Fig. 1).