Thread Draw-Off Nozzle Radial Notches for Spinning Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing yarn withdrawal nozzles for open-end rotor spinning devices face a challenge in achieving high spinning stability while minimizing negative impacts on yarn quality, as they either compromise on stability or quality due to aggressive notch designs.
Innovation Solution
A yarn withdrawal nozzle with radially arranged notches featuring a flat notch base between the inlet and baffle walls, a steep notch outlet, and a peripheral recess, which guides the thread safely and gently, reducing the yarn-damaging effects and improving spinning stability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If notches with steep impact walls are used to increase spinning stability, then spinning stability is improved, but yarn quality deteriorates due to aggressive thread impact
Solution Approach 1:
The notch structure is segmented into three distinct zones: a shallow inlet wall for gentle thread entry, a flat notch base for temporary thread storage and false twist introduction, and a steep impact wall for controlled thread redirection. This segmentation allows each zone to perform its specific function optimally without compromising yarn quality
Solution Approach 2:
The flat notch base acts as an intermediary element between the shallow inlet wall and the steep impact wall. It temporarily stores the thread, allowing the false twist to be introduced gradually while preventing direct impact between the thread and the steep wall, thus mediating between stability requirements and yarn quality protection
2Device complexity
If V-shaped notches without a flat base are used, then the structure is simpler, but the thread jumps undefined from entry ramp to exit ramp causing yarn damage
Solution Approach 1:
The notch is divided into three functional segments: inlet wall, notch base, and impact wall. This segmentation creates a controlled thread path where the thread sequentially passes through each zone, preventing undefined jumping while maintaining manageable structural complexity
Solution Approach 2:
The shallow inlet wall performs preliminary action by gently guiding the thread onto the notch base before it reaches the steep impact wall. This preliminary guidance ensures the thread is properly positioned and prepared for the subsequent zones, preventing damage before it occurs
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a thread draw-off nozzle (1) for an open-end rotor spinning device with an input-side nozzle trumpet (5) and an output-side nozzle bore (6) adjoining the nozzle trumpet (5) as well as notches arranged in the region of the nozzle trumpet (5) and particularly extending radially to the nozzle bore (6). The notches have an inlet wall (8) and a baffle wall (9) as well as an radially external notch inlet (10) and a radially internal notch outlet (11). A flat, preferably planar, notch bottom (12) is arranged between the inlet wall (8) and the baffle wall (9).