Weft Braking Device Lamina Fixation via Slits and Fins
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Solution Overview
Problem
Existing weft braking devices for accumulator yarn feeders face issues with the wear-resistant lamina detachment due to oils, interference with yarn unwinding, deformation affecting braking uniformity, and slippage in oily environments, along with complex and deforming assembly processes.
Innovation Solution
A weft braking device featuring a concave body with slits and a wear-resistant lamina with fins that align and insert into these slits, allowing for a stable, oil-resistant fixation without interfering with yarn unwinding, maintaining braking uniformity, and facilitating straightforward assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If double-sided adhesive tape is used to fix the wear-resistant lamina, then the fixation method is simple, but the lamina detaches due to oils from yarn
Solution Approach 1:
The fixation system is segmented into multiple independent fixation points around the lamina periphery, distributing the mechanical load and preventing oil-induced detachment at any single location. The lamina is secured by multiple equidistant fixation elements rather than a continuous adhesive layer.
Solution Approach 2:
Fixation elements act as intermediaries between the lamina and the braking device body, providing a mechanical connection that is insensitive to oily contaminants. These intermediaries transfer forces without relying on adhesive bonding that degrades in oily environments.
2Reliability
If tabs are used to pinch the outer edge of the lamina, then the lamina is fixed securely, but the tabs interfere with yarn unwinding and cause localized deformations
Solution Approach 1:
The problematic tabs that interfered with yarn unwinding are extracted from the system and replaced by fixation elements positioned at the periphery of the lamina. This removes the source of interference while maintaining secure fixation through equidistant attachment points.
Solution Approach 2:
Fixation is applied locally at discrete peripheral points rather than through continuous edge pinching. This localized fixation approach secures the lamina without creating the localized deformations and interference zones that tabs produced in the yarn path area.
3Ease of manufacture
If the lamina is fixed by friction between materials, then the fixation method is simple, but slippage occurs in oily environments over time
Solution Approach 1:
The lamina is mechanically secured at multiple points before operation begins, preventing any initial slippage that could occur due to oil contamination. The equidistant fixation elements establish immediate mechanical constraint rather than relying on friction that degrades over time.
Solution Approach 2:
The fixation system combines multiple fixation elements distributed around the lamina periphery, creating a composite fixation structure that distributes mechanical loads and prevents slippage through redundant attachment points rather than relying on a single friction-based interface.
4Ease of operation
If tabs are lifted one by one during assembly, then the lamina can be inserted, but the assembly process is complex and the lamina may be permanently deformed
Solution Approach 1:
The fixation system is segmented into multiple independent equidistant elements that can be engaged simultaneously or in sequence without requiring sequential manipulation of tabs. This segmentation allows for simpler, faster assembly without the need to carefully lift and position individual tabs one by one.
Solution Approach 2:
The fixation elements are positioned and prepared in advance on the braking device body, allowing the lamina to be installed in a single straightforward operation. This preliminary arrangement eliminates the complex step-by-step tab lifting and positioning process.
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 provides a stable and enduring fixation of the wear-resistant lamina, preventing slippage and deformation, ensuring consistent braking action and easy assembly, even in oily environments, without compromising yarn feed or braking uniformity.
Implementation Method 1
The yarn being unwound from the feeder slides while being pressed between the delivery edge of the drum and the wear-resistant lamina, in so doing receiving a braking action by friction.
Data Source
Figure 1
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AI summary
A weft braking device comprises an axially symmetrical concave body (16) which is pushed with its internal surface against the delivery edge (12a) of the drum (12) of an accumulator yarn feeder. A wear-resistant lamina (20), which has a concave annular profile delimited between an internal annular edge (20a) and an external annular edge (20b), covers an internal annular surface (S) of the concave body (16) in the region in which it abuts against the drum (12). The concave body (16) has a series of slits (22) which are arranged along a circumference thereof, and the wear-resistant lamina (20) has a series of fins (24) which project from the external annular edge (20b) thereof and can be inserted into the slits (22). The wear-resistant lamina (20) is made of a flexible material having a thickness such that it can be initially applied to the concave body (16) with an opposite concavity with respect thereto, and then turned inside out with matching concavity.