Sewing Machine Thread Hooking Device Guide Portion
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Solution Overview
Problem
Existing automatic thread hooking devices for sewing machines often fail to securely enclose the thread, leading to disengagement or breakage during hemming operations.
Innovation Solution
A thread hooking device with a swing arm and a first hook featuring a guide portion and a thread hooking member that automatically positions and inserts the thread into a groove, utilizing a return member and stop mechanism to prevent back movement and ensure secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a pivotable thread hooking member is used for automatic thread hooking, then the thread hooking operation can be performed automatically, but the thread cannot be fully enclosed and is very likely to disengage or break during hemming operation
Solution Approach 1:
The thread hooking member is divided into multiple functional segments: a hooking portion for catching the thread, a guiding portion for directing the thread, and a threading portion for inserting the thread through the groove. This segmentation allows each part to perform its specific function effectively, ensuring the thread is fully enclosed and secured during automatic hemming operations
Solution Approach 2:
The threading portion acts as an intermediary element that guides the thread from the hooking portion through the hemming groove. This intermediary structure ensures the thread is properly positioned and enclosed, preventing disengagement or breakage while maintaining automatic operation
2Reliability
If manual thread insertion is used, then the thread can be securely positioned, but the hemming operation efficiency is reduced
Solution Approach 1:
The thread hooking member is designed to automatically perform the thread insertion function through its self-contained structure. The hooking portion catches the thread, the guiding portion directs it, and the threading portion automatically inserts it through the groove, eliminating the need for manual intervention while ensuring secure thread positioning
Solution Approach 2:
Multiple functions (thread hooking, guiding, and threading) are merged into a single integrated thread hooking member. This combination allows the device to maintain reliable thread security while operating automatically, thereby improving hemming efficiency without sacrificing thread position security
Data Source
AI summary
A thread hooking device for a hemming device of a sewing machine is provided with a swing arm driven to move by a drive shaft. The first hook is formed with a guide portion on which being slidably mounted a thread hooking member 40 located at a second end of the guide portion. The thread hooking member is formed a thread hooking portion, the thread is inserted into the thread groove via the thread hooking portion and then extends out of the thread hole. The thread guiding member moves from the second end of the guide portion to the first end of the guide portion, when the thread hooking is aligned to the first end of the guide portion, the thread is inserted through the thread hole, moving the thread hooking member to the second end of the guide portion makes the thread insert in the thread groove.