Thread Draw-Off Nozzle Blocking Element for Open-End Spinning
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Solution Overview
Problem
In open-end rotor spinning, the thread circulation on the thread-guiding surface of the draw-off nozzle leads to false twist and belly bands, reducing thread quality due to random contact and spatial inefficiency.
Innovation Solution
A blocking element with a thread stop surface is integrated into the thread draw-off nozzle to limit thread circulation, allowing controlled thread production by preventing false twist and creating a free installation space for additional units like a rotor cleaning unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the thread is allowed to circulate freely on the thread-guiding surface, then the thread production process is simple, but false twist and belly bands occur reducing thread quality
Solution Approach 1:
The harmful circulation movement of the thread is extracted and eliminated by introducing a blocking element that selectively removes the unwanted circulating motion while preserving the necessary thread drawing function
Solution Approach 2:
A blocking element is introduced as an intermediary component between the thread-guiding surface and the circulating thread. This mediator blocks the harmful circulation while allowing controlled thread passage, resolving the contradiction between simple process and high quality
2Area of stationary object
If the thread continuously circulates over the entire periphery of the draw-off nozzle, then the spatial use extends over the entire circumference, but this causes belly bands and reduces thread quality
Solution Approach 1:
The blocking element extracts and eliminates the harmful portion of the thread circulation path, preventing the thread from contacting the fibre entry region and thus preventing belly band formation while maintaining efficient space utilization
3Manufacturing precision
If a blocking element is introduced to prevent thread circulation, then false twist is prevented, but the device complexity increases
Solution Approach 1:
The blocking element is designed with localized functionality - a thread stop surface positioned at a specific location on the draw-off nozzle. This local intervention prevents false twist without requiring complex system-wide modifications, resolving the contradiction between precision and simplicity
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 solution effectively prevents false twist and belly bands, enabling targeted thread characteristics and efficient thread production while providing a free space for supplementary units.
Implementation Method 1
the thread rolls over the thread-guiding surface with slip, resulting in a false twist of the thread
Implementation Method 2
the blocking element has a thread stop surface designed such that the thread stop surface blocks the circulation of the thread over the thread-guiding surface
Data Source
AI summary
An open-end spinning device having a thread draw-off nozzle and a thread draw-off nozzle for an open-end spinning device, the thread draw-off nozzle having a thread-guiding surface which extends between an entry opening and a draw-off opening and which tapers in the shape of a funnel toward the draw-off opening. In order to provide a thread draw-off nozzle and an open-end spinning device having a thread draw-off nozzle which allows controlled production of the thread, the thread draw-off nozzle has a blocking element, which protrudes from the thread-guiding surface and which has a thread stop surface designed such that the thread stop surface blocks a thread from circulating over the thread-guiding surface.