Elastic Needle Bar Thread Guide for Sewing Machines
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Solution Overview
Problem
Conventional needle bar thread guides for sewing machines are cumbersome to thread and unthread, with a high likelihood of needle thread disengagement during sewing, leading to reduced operability and increased difficulty in maintaining the thread guide.
Innovation Solution
A needle bar thread guide with a thread hooking member and an elastically deformable thread cast-off preventing member, where the thread guide part is closed by the cast-off preventing part, allowing easy threading and preventing disengagement by maintaining contact with the thread hooking part, even during needle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle bar thread guide uses a conventional open thread guide part, then the needle thread can pass through easily, but the needle thread is prone to disengagement during sewing
Solution Approach 1:
The thread guide part is designed to be movable relative to the thread hooking part, allowing it to dynamically adjust its position. During threading, the thread guide part can move to facilitate easy thread passage, and during sewing, it maintains contact with the thread hooking part to prevent disengagement, thus resolving the contradiction between ease of threading and reliability of thread retention
Solution Approach 2:
The thread guide part changes its positional parameter relative to the thread hooking part based on operational requirements. During threading operations, the thread guide part is positioned to allow easy thread passage, while during sewing operations, it maintains contact with the thread hooking part to prevent disengagement, thereby addressing both ease of operation and reliability
2Reliability
If the needle bar thread guide uses a closed thread guide part to prevent thread disengagement, then thread retention improves, but the threading operation becomes difficult
Solution Approach 1:
The thread guide part is designed to be movable relative to the thread hooking part, allowing it to dynamically adjust its position. During threading, the thread guide part can move to facilitate easy thread passage, and during sewing, it maintains contact with the thread hooking part to prevent disengagement, thus resolving the contradiction between ease of threading and reliability of thread retention
Solution Approach 2:
The needle bar thread guide is divided into two functional segments: the thread guide part that facilitates threading and the thread hooking part that prevents disengagement. These segments can move relative to each other, allowing the thread guide part to be repositioned during threading operations to maintain accessibility, while the thread hooking part remains in position to ensure thread retention during sewing
3Reliability
If the needle bar thread guide uses a complex structure to prevent thread disengagement, then thread retention improves, but the manufacturing complexity increases
Solution Approach 1:
The thread guide part and thread hooking part are merged into a single integrated component that moves as one unit. This merging simplifies the overall structure compared to having separate mechanisms, while still achieving reliable thread retention through the contact between the thread guide part and thread hooking part during sewing operations
Solution Approach 2:
The integrated needle bar thread guide serves multiple functions: the thread guide part guides the needle thread during threading operations, and the same structure (with the thread hooking part) prevents thread disengagement during sewing. This multi-functionality reduces the need for separate components, thereby simplifying the overall structure and reducing manufacturing complexity
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
Simplifies the threading and unthreading process, prevents needle thread disengagement during sewing, and reduces manufacturing complexity and cost by using a lightweight, easily manufactured leaf spring design.
Implementation Method 1
a thread cast-off preventing member 16 which is elastically deformable and has a thread cast-off preventing part 16b closing the thread guide part 15e
Data Source
AI summary
A needle bar thread guide for a sewing machine includes a thread guide part located in a thread hooking part of a thread hooking member to guide the needle thread into the thread hooking part, and a thread cast-off preventing member having a thread cast-off preventing part closing the thread guide part. The thread cast-off preventing member is elastically deformable. The thread cast-off preventing part has a distal end which is in contact with an upper surface of the thread hooking part.