Pivotable Depinning Roller for Textile Web Distortion Correction
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Solution Overview
Problem
Conventional needle straightening arrangements introduce high residual distortions and mechanical stress due to a fixed unpinning point, which is not adaptable to material properties, leading to edge damage or excessive distortion.
Innovation Solution
A pivotable depinning roller allows for individual adjustment of the unpinning point based on material properties, with a spread profile that maximizes spreading in one area and minimizes it in another, enabling precise distortion correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the web is unpinned from the straightening wheels too late, then the straightening forces continue to act on the web, but the sheet distortion introduced by the needle straightening arrangement increases
Solution Approach 1:
The depinning roller is designed to be pivotable about a pivot axis, enabling the unpinning point to be dynamically adjusted based on material properties such as elasticity and condition. This dynamic adjustment allows optimization of the unpinning timing to minimize residual distortions while maintaining effective straightening forces.
Solution Approach 2:
The invention changes the parameter of unpinning point position along the circumference of the straightening wheels. By adjusting this parameter based on material properties, the system optimizes the balance between applying sufficient straightening forces and minimizing residual distortions.
2Object-generated harmful factors
If the web is unpinned from the straightening wheels too early, then the straightening forces are still so high that the web is almost torn from the straightening wheels, but edge distortions and damage occur
Solution Approach 1:
The pivotable depinning roller enables dynamic adjustment of the unpinning point to ensure it occurs at the optimal moment when straightening forces have been sufficiently applied but before edge damage occurs. This dynamic control adapts to different material properties and distortion levels.
Solution Approach 2:
The invention adjusts the unpinning point parameter along the wheel circumference based on material properties, optimizing the transition from high straightening forces to reduced forces without causing edge damage or excessive residual distortions.
3Device complexity
If conventional needle straightening arrangements use a fixed unpinning point, then the structure is simple, but high residual distortions are introduced into the material web
Solution Approach 1:
The depinning roller is designed to be pivotable about a pivot axis, transforming the fixed unpinning point into a dynamically adjustable one. This adds moderate complexity to the device structure but significantly reduces residual distortions by allowing optimization based on material properties.
Solution Approach 2:
The invention introduces adjustability of the unpinning point parameter along the wheel circumference, enabling optimization of distortion correction while accepting increased structural complexity through the pivotable roller mechanism.
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
This approach significantly improves distortion correction by allowing tailored unpinning according to material elasticity and distortion levels, reducing mechanical stress and edge damage while maintaining effective straightening.
Implementation Method 1
By pivoting the straightening wheels about a pivot axis at a predetermined angle to the running direction of the textile web and with a predetermined transverse force, a laterally outwardly acting transverse tension is introduced into the textile web, causing the web to spread.
Implementation Method 2
The point in time at which the web is unpinned or the selection of the unpinning point from the straightening wheels depends in particular on the material properties, in particular its elasticity and/or the condition of the web
Data Source
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AI summary
The guide assembly (1) has a primary unit that is rotated around pivot point (DP1) and swung around pivotal axis (SA1) by needle direction wheel (2). A secondary unit is rotated around pivot point (DP2) and swung around pivotal axis (SA2) by needle direction wheel (3). A web material (W) with opposite edges is provided at needle point (NAUF) of needle direction wheel. The spreading value of web material is reduced to aristocracy location by needle direction wheel. A needle roller (11) is rotated around a pivotal axis (SA). An independent claim is included for a method for setting needle.