Yarn Winding Defect Removal via Inversion
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Solution Overview
Problem
Existing yarn winding machines face productivity reductions due to time-consuming searches for yarn ends with unknown positions when defects are detected, leading to inefficiencies in cutting out and splicing faulty yarn sections.
Innovation Solution
A method where the yarn is pulled back in the opposite direction after defect detection, allowing for precise positioning and cutting of yarn defects without needing to search for the end, utilizing a retraction device and cutting stations on either side of the splicing device, enabling simultaneous or sequential cutting and splicing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yarn end is searched for behind the yarn clearer after defect detection, then the yarn defect can be cut out, but the productivity is reduced due to time-consuming search
Solution Approach 1:
Instead of searching forward for the yarn end after defect detection, the invention pulls the yarn backward through the yarn clearer to bring the defect to a known position (the cutting device). This inversion of the search direction eliminates the time-consuming search process and enables immediate defect removal, resolving the contradiction between reliability and productivity
2Measurement precision
If the yarn is pulled back through the yarn clearer, then the defect position can be precisely determined and yarn losses reduced, but the process complexity increases
Solution Approach 1:
The yarn clearer serves dual purposes: it not only detects yarn defects during normal winding but also actively pulls the yarn backward during defect removal. This self-service capability of the yarn clearer eliminates the need for separate positioning mechanisms, achieving precise defect positioning without significantly increasing device complexity
Data Source
Figure 1
Figure 2
AI summary
The method involves guiding the yarn (2) between the yarn supply and the target coil in a running direction (L) by a yarn cleaner (9) to secure the yarn quality. The yarn defect is cut out upon detection of the yarn defect and the yarn is then spliced. The yarn is first withdrawn against the direction and then cut upon detection of the yarn defect. A pulling force is exerted on the yarn for withdrawal of the yarn upon detection of the yarn defect between the yarn supply and the yarn cleaner with a return device (4). An independent claim is included for a winding machine with a cutting station.