Adjustable Stop for Open-End Spinning Rotor Positioning
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Solution Overview
Problem
Existing open-end spinning devices face challenges in accurately positioning the thread take-off nozzle relative to the spinning rotor, particularly due to manufacturing tolerances and wear-related changes, which affect the quality of the spun yarn.
Innovation Solution
An adjustable stop mechanism is integrated into the open-end spinning device, allowing for precise axial positioning of the cover element and thread take-off nozzle relative to the spinning rotor, compensating for tolerances and wear, using an adjustable screw or axially movable stop that can be easily accessed for adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed stop is used for positioning the cover element, then the structure is simple, but the positioning accuracy deteriorates due to manufacturing tolerances and wear
Solution Approach 1:
The stop is designed as an adjustable component rather than a fixed element. The adjusting screw can be repositioned along the rotor housing to compensate for wear and manufacturing tolerances, transforming a static positioning system into a dynamic one that can adapt to changing conditions while maintaining positioning accuracy
Solution Approach 2:
The adjustable stop allows operators to self-correct positioning deviations without requiring complex automated systems. The simple adjusting mechanism enables users to manually compensate for wear and tolerances, making the system self-correcting while keeping the overall structure relatively simple
2Reliability
If the stop is made adjustable to compensate for tolerances and wear, then positioning accuracy improves, but the device complexity increases
Solution Approach 1:
The stop's position parameter can be changed along the axial direction of the rotor shaft through the adjusting screw mechanism. This allows the system to adapt to wear and tolerances by changing the stop's location, thereby maintaining reliable positioning without requiring a completely complex adjustment mechanism
Solution Approach 2:
The adjustment mechanism is segmented into simple, discrete components: the adjusting screw, the stop element, and the receptacle. This segmentation allows for easy maintenance and adjustment while keeping each individual component simple, reducing overall device complexity despite the added adjustability
3Ease of operation
If the adjusting screw is accessible from the front, then ease of operation improves, but the risk of unauthorized adjustments increases
Solution Approach 1:
Different regions of the adjusting screw have different properties: the head is accessible for intentional adjustments, while the body is protected within the rotor housing to prevent unauthorized changes. This local differentiation allows easy operation when needed while maintaining setting stability during normal operation
Data Source
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Figure 2
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AI summary
In an open-end spinning device (1) for an open-end spinning machine (2) with a driveable spinning rotor (3), the rotor cup (4) of which is received in a rotor housing (6), with a drive (8) for the spinning rotor (3) arranged in a drive housing (7), and with at least one receptacle (10) for a cover element (11) that closes the rotor housing (6) during spinning operation, wherein the rotor housing (6) has a stop (22) for the cover element (11) for positioning the cover element (11) in the axial direction of the spinning rotor (3), the stop (22) is adjustable. In an open-end spinning machine (2) with a plurality of work stations arranged side by side, each work station has such an open-end spinning device (1).