Open-End Spinning Device With Exchangeable Twist Propagation Limiter
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Solution Overview
Problem
Existing open-end spinning devices face challenges in minimizing the distance between the yarn draw-off nozzle and the twist control element, leading to suboptimal yarn quality, and require lengthy downtimes during rotor diameter changes due to the inability to exchange the channel plate adapter with the yarn draw-off nozzle and twist control element simultaneously.
Innovation Solution
An open-end spinning device design featuring an exchangeable channel plate adapter with an easily replaceable twist retaining element and yarn draw-off nozzle, allowing for adjustable distances between deflections and enabling pre-assembled subassemblies for rapid component changes, utilizing bayonet catches or threads for secure attachment to prevent misalignment and ensure high yarn quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the twist retaining element is integrated into the cover with a fixed yarn draw-off tube, then the structure is simple, but the distance between yarn draw-off nozzle and twist control element cannot be sufficiently reduced
Solution Approach 1:
The patent divides the system into separate modular components: the channel plate adapter with yarn draw-off nozzle and the twist retaining element are independent exchangeable parts. This segmentation allows each component to be optimized independently and enables the channel plate adapter to be exchanged as a complete unit with the nozzle already positioned, achieving minimal distance between deflection points while maintaining manufacturing simplicity.
2Adaptability or versatility
If the channel plate adapter with yarn draw-off nozzle and twist control element are separate components, then each can be optimized independently, but the changeover time during rotor diameter changes increases
Solution Approach 1:
The patent combines the channel plate adapter and yarn draw-off nozzle into a single integrated exchangeable unit. When rotor diameter changes require a different channel plate adapter, the entire assembly including the nozzle is replaced together as one unit. This merging eliminates the need to replace the nozzle separately after installing a new channel plate adapter, significantly reducing changeover time while maintaining the ability to adapt to different rotor diameters.
3Ease of manufacture
If the yarn draw-off nozzle is fixed in the channel plate adapter using elastic elements, then the attachment is simple, but the nozzle may unintentionally shift position during operation
Solution Approach 1:
The patent extracts the positioning function from elastic elements and implements it through a precision-machined interface between the channel plate adapter and yarn draw-off nozzle. The nozzle is attached using a threaded connection with a locknut or split nut, providing secure mechanical fixation. This extraction of the positioning function from elastic elements eliminates the risk of unintentional shifting while maintaining ease of attachment through standard threaded fastening mechanisms.
Data Source
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AI summary
An open-end spinning device includes a cover (2) that closes a rotor housing (3). An interchangeable channel plate adapter (8) is mounted in the cover (2), through which fiber feeding and yarn take-off take place. Yarn take-off occurs via a yarn take-off nozzle (115) and at least one downstream and easily interchangeable twist stall element (117) with a substantially central yarn take-off opening. The twist stall element (117) can be inserted directly into the channel plate adapter (8).