Air Jet Loom Threading Device Stabilizing Yarn Introduction
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Solution Overview
Problem
In air jet looms, the threading of a weft yarn into weft insertion nozzles is unstable due to turbulent airflow caused by saturated thread guide holes, making it difficult to introduce the yarn effectively.
Innovation Solution
A weft insertion device with a guide unit and an air discharging unit, where the guide unit has a through-hole aligned with the thread guide hole and the air discharging unit is connected to the outside, preventing airflow turbulence by discharging excess air, thereby stabilizing the yarn introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If compressed air is supplied to the thread guide hole for threading the weft yarn, then the threading operation can be performed, but the airflow becomes saturated and turbulent behind the thread guide, making the yarn end position unstable
Solution Approach 1:
The invention divides the air supply system into two separate functions: a thread guide hole for yarn passage and a dedicated air supply hole for compressed air delivery. This segmentation allows independent optimization of yarn guidance and air flow, preventing the mixing of functions that causes turbulence and instability in the threading process.
2Device complexity
If the thread guide hole is used for both yarn passage and air supply, then the structure is simple, but the airflow becomes turbulent and the threading becomes difficult
Solution Approach 1:
The invention separates the thread guide hole and air supply hole as distinct structural elements. The thread guide hole maintains its primary function for yarn passage, while the air supply hole is dedicated to compressed air delivery. This functional segmentation eliminates the interference between yarn flow and air flow, ensuring smooth threading operations without compromising structural simplicity.
Solution Approach 2:
The air supply hole acts as an intermediary channel that delivers compressed air to the thread guide hole without directly mixing with the yarn passage path. This intermediary structure enables the air to reach the threading zone effectively while maintaining separate flow paths, preventing turbulence and improving threading ease.
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 device ensures stable introduction of the weft yarn into the thread guide hole by preventing airflow turbulence and maintaining airflow stability, improving the threading process in air jet looms.
Implementation Method 1
compressed air ejected toward the thread guide hole of a thread guide from a nozzle disposed behind the at least one of the weft insertion nozzles
Implementation Method 2
a guide unit that has a through-hole and that is provided so that a center of the through-hole coincides with a center of the thread guide hole
Data Source
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AI summary
Provided is a threading device (20) for an air jet loom (1) including a plurality of weft insertion nozzles (5, 7) each including a nozzle body (14) in which an insertion hole (14a) is formed and a thread guide (15) that is disposed in the insertion hole (14a) of the nozzle body (14) and in which a thread guide hole (18) extending therethrough in an axial direction is formed, each weft insertion nozzle (5, 7) performing weft insertion of a weft yarn (2), which is inserted into the thread guide hole (18) of the thread guide (15), by using a jet of compressed air that is formed when the compressed air is supplied to the insertion hole (14a) and ejected from an ejection hole at an end of the weft insertion nozzle (5, 7) through a space around the thread guide (15) in the insertion hole (14a). The air jet loom (1) performs one weft insertion by cooperation of the plurality of weft insertion nozzles (5, 7). For at least one of the plurality of weft insertion nozzles (5, 7), the weft yarn (2) is threaded into the thread guide hole (18) by using compressed air ejected toward the thread guide hole (18) of the thread guide (15) from a nozzle (9) disposed behind the at least one of the weft insertion nozzles (5, 7). The threading device (20) includes a guide unit that has a through-hole (27) and that is provided so that a center of the through-hole (27) coincides with a center of the thread guide hole (18) when viewed in the axial direction of the thread guide (15) into which the weft yarn (2) is threaded by using the compressed air, and an air discharging unit that is provided so as to be continuous with the guide unit with respect to the axial direction and in which an inner space portion that is continuous with a space in the through-hole (27) of the guide unit is formed so as to be connected to the outside. The threading device (20) is disposed so as to be continuous with a back end of the thread guide (15) with respect to the axial direction. The threading device (20) includes the guide unit in at least an end portion thereof on an opposite side to the thread guide side in the axial direction.