Sewing Machine Wire Holder for Secure Thread Loop Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sewing machine threading devices face issues with the upper thread loop being accidentally pulled out of the needle eye due to its short length or movement of the take-up lever, requiring repetitive threading processes.
Innovation Solution
A device featuring a wire holder mounted on a pivoting support that secures the thread loop during formation without the need for a link, ensuring the loop remains in place until complete formation and is protected from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the upper thread loop is formed by the threading hook without additional securing mechanisms, then the device construction remains simple, but the thread loop can be accidentally pulled out of the needle eye due to its short length or movement of the take-up lever
Solution Approach 1:
A wire holder is introduced as an intermediary component between the threading hook and the thread loop. The wire holder temporarily secures the thread loop during the critical formation phase, preventing it from being pulled out, and then releases it when no longer needed. This mediator resolves the contradiction by providing reliable retention without requiring permanent complex mechanisms.
Solution Approach 2:
The wire holder performs a preliminary securing action on the thread loop immediately after it is formed by the threading hook. By preemptively holding the loop in place during its vulnerable formation stage, the system prevents potential failures before they occur, allowing the loop to be safely formed and then released for the sewing process.
2Reliability
If a wire holder with link is used to secure the thread loop, then the thread loop retention is improved, but the device complexity increases and the wire holder requires protection from damage in the sewing area
Solution Approach 1:
The unnecessary link component is extracted and removed from the wire holder design. The wire holder is simplified to consist only of the essential elements needed to secure and release the thread loop. This extraction eliminates unnecessary complexity while maintaining the core function of reliable thread loop retention.
Solution Approach 2:
The wire holder is designed as a segmented, modular component that can be mounted on the pivoting support for the threading hook. This segmentation allows the wire holder to be positioned optimally for securing the thread loop while being easily removable or protectable during the sewing process, reducing overall system complexity.
3Ease of operation
If the wire holder remains in the sewing area during operation, then the threading function is maintained, but the filigree construction of the wire holder is exposed to damage
Solution Approach 1:
The wire holder is designed with dynamic positioning capability, mounted on the pivoting support for the threading hook. This allows the wire holder to move with the threading hook during the threading operation, maintaining its securing function when needed, while being automatically positioned outside the sewing area during the sewing process, protecting its filigree construction from damage.
Data Source
AI summary
A device (1) with a wire holder (13) for securing the upper thread loop (25) after the threading of the upper thread (23) through the eye (5) of a sewing machine needle (3) is provided. The wire holder deflects a progression of the two thread legs of the thread loop (25) upwards and thus securely holds the upper thread (23) in a hook chamfer at the hook (7).