Air Jet Loom Nozzle Thread Guide Diagonal Cut
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Solution Overview
Problem
The existing weft yarn transferring nozzles for air jet looms face variability in air pressure and timing due to different mounting positions of thread guides, making it challenging to achieve uniform air pressure for weft yarn delivery across multiple air jet looms.
Innovation Solution
A weft yarn transferring nozzle with a thread guide having a circular weft passage and a nozzle body forming an air path along the outer peripheral surface, where the thread guide's tip portion is cut diagonally, and includes an indication portion for the normal line direction, ensuring consistent air pressure and timing by adjusting the thread guide angle to optimize air discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thread guide mounting position is varied to adapt to different air jet loom configurations, then the adaptability of the nozzle system improves, but the air pressure uniformity and timing consistency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-setting the thread guide at a specific angle (θ) relative to the center axis line of the weft passage during manufacturing. This predetermined angular orientation ensures that regardless of where the thread guide is mounted on different air jet looms, the air discharge direction and pressure distribution remain optimized. The thread guide's diagonal cut surface is designed with a specific normal line direction that preliminarily establishes the correct air flow orientation before mounting, thus maintaining reliability across varied applications.
Solution Approach 2:
The patent utilizes parameter changes by modifying the geometric parameters of the thread guide, specifically the angle of the cut surface relative to the center axis line. By changing this angular parameter to a specific value, the air discharge characteristics are optimized. This parameter adjustment ensures that the air pressure and timing remain consistent even when the mounting position varies across different air jet loom configurations, thereby resolving the contradiction between adaptability and reliability.
2Reliability
If high air discharge pressure is used to ensure weft yarn reaches target position, then the yarn delivery reliability improves, but the energy consumption and system complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the thread guide angle to achieve maximum air discharge efficiency at lower pressures. By adjusting the angular parameter of the thread guide surface, the air flow is directed more effectively toward the weft yarn, reducing the pressure needed to achieve reliable yarn delivery. This parameter optimization allows the system to maintain high reliability while consuming less energy.
Solution Approach 2:
The patent applies local quality by concentrating the air discharge energy in a specific directional pattern through the angled thread guide surface. Instead of dispersing air pressure uniformly in all directions, the diagonal cut surface focuses the air flow along a specific trajectory that directly targets the weft yarn path. This localized concentration of air pressure improves delivery reliability without requiring high overall system pressure, thereby reducing energy consumption.
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 ensures uniform air pressure and efficient weft yarn delivery at the target position across various air jet looms, reducing the required air discharge pressure and enhancing yarn travel efficiency by positioning the center of pressure correctly.
Implementation Method 1
a nozzle body accommodating the thread guide and forming an air path through which the air flows in a direction of the weft passage along an outer peripheral surface of the thread guide
Implementation Method 2
a tip portion that is cut along a surface diagonal to a center axis line of the weft passage... achieves uniform pressure of air discharged for a weft yarn to arrive at a target position at a target position arrival timing
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A weft yarn transferring nozzle (50) for an air jet loom (100) includes a thread guide (53) having a weft passage (53d) through which the weft yarn (21) is introduced and guided, and a nozzle body (51) accommodating the thread guide (53) and forming an air path (55). The air path (55) extends so as to overlap with a weft path (52d) on a downstream side of the weft passage (53d). The weft passage (53d) of the thread guide (53) has a circular section and has a tip portion (53c) cut along a surface (S, D1, D2) diagonal to a center axis line (L) of the weft passage (53d). The thread guide (53) includes an indication portion (53g, 53i, 53j) indicating a direction normal to the surface (S, D1, D2) in a portion of the thread guide (53) exposed from the nozzle body (51).