Lifting Heddle Foot Design for Dust Ejection in Leno Weaving
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Solution Overview
Problem
High kinetic energy and dust accumulation in loom systems lead to defects in leno weaves due to the half-heddle slipping past the magnet, causing improper transfer during shed changes, especially at high weft counts, and existing cleaning methods require disassembly of the apparatus.
Innovation Solution
Designing a lifting heddle foot with a continuous opening for easy cleaning and incorporating a stopper to ensure the half-heddle remains in contact with the magnet, along with dual magnets for secure magnetic control, and a guide groove for proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the lifting heddle foot has a closed structure, then it provides structural strength, but dust accumulates inside causing magnetic control failure
Solution Approach 1:
The lifting heddle foot is divided into two parts: an upper closed portion for structural strength and a lower open portion for dust ejection. This segmentation allows the structure to maintain strength while enabling dust to escape, preventing magnetic control failure.
Solution Approach 2:
A vertical ejection opening is provided in the lower portion of the lifting heddle foot, creating a new dimensional pathway for dust ejection. This opening extends downward to allow dust to be ejected from the bottom, solving the dust accumulation problem without compromising structural integrity.
2Strength
If the half-heddle is allowed to float during movement, then it reduces wear on the saddle, but magnetic control becomes ineffective
Solution Approach 1:
The stopper element is pre-positioned on the half-heddle at a predetermined location. When the half-heddle reaches the correct position, the stopper makes contact with the lifting heddle foot, preliminarily preventing further movement and ensuring the half-heddle remains properly positioned for magnetic control while reducing wear.
3Object-affected harmful factors
If the opening in the lifting heddle foot is made larger, then dust ejection is improved, but structural stability decreases
Solution Approach 1:
The lifting heddle foot is segmented into an upper closed portion for structural stability and a lower open portion for dust ejection. This segmentation allows the upper portion to maintain structural integrity while the lower portion provides adequate opening for dust to escape, balancing both requirements.
4Object-affected harmful factors
If the stopper contact point is positioned higher, then magnetic control is improved, but wear on the lifting heddle increases
Solution Approach 1:
The stopper is positioned to make contact with the lifting heddle foot at a predetermined location that optimizes magnetic control. The stopper element is designed to engage the lifting heddle foot at this specific point, preliminarily preventing the half-heddle from floating and ensuring reliable magnetic control while minimizing wear through proper positioning.
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
Prevents dust buildup and ensures consistent magnetic control of the half-heddle, reducing weave defects and allowing for easy maintenance without disassembling the apparatus, even at high weft speeds.
Implementation Method 1
the magnet in the lifting heddle foot ensures during the entrainment movement of the half-heddle through the one lifting heddle that the half-heddle does not float
Implementation Method 2
a stopper element 25 is provided on the half-heddle 20, said stopper element 25 being designed to contact the lifting heddle foot 11
Data Source
AI summary
A device for forming a leno selvedge has two lifter seats and a metallic approximately U-shaped half heddle with two legs, which are connected by a web, wherein each lifting heddle has a lifting heddle foot having an opening extending in the longitudinal direction of the heddle, wherein the lifting heddle foot at least on one side of the slot at least one magnet, with which the one leg of the half heddle cooperates, wherein the opening extends over the entire height of the heddle foot continuously.