Thread Tension Regulator for Weaving Machines
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Solution Overview
Problem
Existing weaving machines with leno weaving devices face high thread tension differences between shed open and closed positions, leading to thread breakage, especially with fibers like fiberglass, aramid, and basalt, due to insufficient tension compensation by spring devices.
Innovation Solution
A device for regulating thread tension using two lifting healds and a half heald, arranged 180° rotated relative to the leno binding device, with magnets controlling the half heald and hook-shaped elements for attachment, ensures reduced tension difference by guiding threads through the device in opposite directions, acting as both a tension regulator and hold-down mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a spring mechanism is designed to compensate for thread elongation in the bobbin area, then thread tension is reduced, but due to numerous deflections and frictional losses the spring mechanism can no longer compensate for thread tension effectively
Solution Approach 1:
The patent introduces a holder as an intermediary component between the spring mechanism and the thread. This holder is designed to be spring-loaded and positioned immediately upstream of the twist binding device, allowing it to directly compensate for thread tension without the energy losses accumulated through multiple deflections in the bobbin area. The holder acts as a local tension compensation mechanism that eliminates the need for long-thread-path spring compensation.
Solution Approach 2:
The invention changes the spatial arrangement by moving the tension compensation mechanism from the bobbin area (remote location) to immediately upstream of the twist binding device (local location). This dimensional repositioning reduces the thread path length and eliminates multiple deflection points, thereby reducing frictional losses while maintaining tension compensation effectiveness.
2Ease of operation
If the shed opens, the twisting thread or stand thread is put under tension due to increased travel distance, but this tension can lead to thread breakage in fiberglass, aramid or basalt threads
Solution Approach 1:
The holder is pre-loaded with spring force before the shed opening occurs. This preliminary spring loading ensures that when the thread is subjected to increased travel distance and tension during shed opening, the holder is already prepared to compensate for the tension immediately, preventing thread breakage before it can occur.
Solution Approach 2:
The spring-loaded holder provides beforehand cushioning by being pre-loaded with elastic energy. When the shed opens and thread tension increases, this pre-loaded spring mechanism absorbs the tension shock and prevents it from reaching critical levels that would cause breakage in fragile threads like fiberglass, aramid, or basalt.
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 significantly reduces thread tension differences, minimizing thread stress and wear, and functions effectively as a thread hold-down device, preventing breakage across various yarn types.
Implementation Method 1
a holder for the stand and/or twist thread must be provided immediately upstream of the twist binding device, whereby the twist and/or stand thread is held under elastic tension. By arranging such a holder in the yarn feed direction immediately upstream of the twist binding device or the lever arms of such a twist binding device, the yarn tension is balanced by the spring action of the holder when the shed opens.
Data Source
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AI summary
The invention relates to a device (1) for regulating the thread tension of the twist and stand threads (60, 70) guided by a twist binding device (20) with two lifting caps (22, 24) and a half-strand (21), wherein the lifting caps (22, 24) are arranged on the counter-rotating upper and lower heddles of a weaving machine, wherein the device (1) for regulating the thread tension comprises two lifting caps (2, 4) and a half-strand (11) guided and controlled by the lifting caps (2, 4), wherein the device (1) for regulating the thread tension is arranged rotated by 180° relative to the twist binding device (20) on the heddles (30a - 30d) of the weaving machine.