Spinning Machine Yarn Guide Tension Detection
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Solution Overview
Problem
Conventional spinning machines fail to reliably detect and remove weakly-twisted yarns, leading to defective yarn production and reduced package quality due to unstable airflow caused by yarn waste accumulation or nozzle clogging, as they lack effective tension detection mechanisms for the traveling spun yarn.
Innovation Solution
A spinning machine design incorporating a yarn guide with an inclined cross-sectional contour and a strain sensor to detect tension changes, allowing for a larger contact angle and accurate detection of yarn tension, along with a yarn accumulating device functioning as a bending guide to reduce component count and prevent yarn damage, and an abnormality detecting section to identify and remove weak yarns promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a yarn guide with an inclined cross-sectional contour is used to increase the contact angle for accurate tension detection, then measurement precision is improved, but device complexity increases due to the need for additional guiding components
Solution Approach 1:
The yarn accumulating device is made to serve dual functions: it accumulates yarn during the spinning process and simultaneously acts as a bending guide to increase the contact angle at the tension detection point. This eliminates the need for separate guiding components while achieving accurate tension measurement through the inclined cross-sectional contour of the yarn guide.
Solution Approach 2:
The patent combines the yarn accumulating device and the bending guide function into a single integrated component. The yarn accumulating device is positioned and configured to naturally create the necessary yarn path bending, merging two previously separate functions into one unified structure that reduces overall device complexity.
2Measurement precision
If additional guiding members are added to maintain a predetermined contact angle for stable tension measurement, then measurement precision is improved, but the risk of yarn damage increases
Solution Approach 1:
The yarn accumulating device performs dual functions as both an accumulation mechanism and a bending guide. By utilizing the natural yarn path created during accumulation, it provides the necessary contact angle for stable tension measurement without requiring additional guiding members that could potentially damage the yarn.
Solution Approach 2:
The yarn accumulating device automatically creates the necessary bending and contact angle conditions through its own operation. The yarn path formed during the accumulation process inherently provides the required geometry for stable tension detection, eliminating the need for external guiding components that could cause yarn damage.
3Measurement precision
If the axial line of the yarn guide is inclined with respect to the yarn path to increase contact angle, then tension detection accuracy is improved, but the structural complexity of the detecting section increases
Solution Approach 1:
The yarn accumulating device is configured to serve as both the accumulation mechanism and the inclined bending guide. By integrating these functions, the patent achieves the necessary inclined configuration for accurate tension detection without adding separate structural components, thereby maintaining simplicity in the detecting section.
Solution Approach 2:
The patent introduces an inclined configuration in three-dimensional space by orienting the axial line of the yarn guide at an angle with respect to the yarn path. This spatial arrangement, achieved through the integrated yarn accumulating device, increases the contact angle and improves detection accuracy without requiring complex additional structures.
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 enables reliable detection of subtle tension changes in spun yarns, preventing weak yarns from being wound into packages, improving product quality and productivity by allowing for prompt removal of abnormalities, and reducing the need for additional guides that could damage the yarn.
Implementation Method 1
a detector arranged to output a signal according to a force applied to the yarn guide
Data Source
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AI summary
A spinning sensor (52) detects a tension of a spun yarn (10) travelling between a spinning device and a winding device. The spinning sensor (52) includes a yarn guide (60) making contact with the travelling spun yarn 10, and a strain sensor to output a signal according to a force applied to the yarn guide 60. The yarn guide 60 has a substantially arcuate cross-sectional contour at a cross section perpendicular to an axial line (64) at least at a portion making contact with the spun yarn (10). A direction parallel to a yarn path of the spun yarn (10) located upstream of the yarn guide (60) is a Y-axial direction. A direction parallel to an axial direction of a draft roller is an X-axial direction. A direction perpendicular to the Y-axial and the X-axial directions is a Z-axial direction. When viewed in the Z-axial direction, an axial line (64) of the yarn guide (60) is inclined with respect to the Y-axial direction.