Sewing Machine Thread Length Adjustment Mechanism
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Solution Overview
Problem
Existing sewing machines with thread cutting apparatuses have a fixed thread margin, making it difficult to sew materials like quilt cloths where a variable thread length is required, limiting the versatility of the sewing machine in terms of cloth type and sewing method.
Innovation Solution
A sewing machine with a thread length adjustment mechanism that includes a cutting member and a thread length adjustment mechanism, allowing for the adjustment of upper and lower thread lengths between the needle plate hole and the rotating hook, enabling the setting of a desired thread margin on the cloth side through an operating unit and driven by a control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed thread cutting apparatus is used to provide a short thread margin, then the thread cutting precision is improved, but the adaptability to different cloth types and sewing methods deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the thread margin adjustable rather than fixed. The thread length adjustment mechanism allows the thread margin to be dynamically changed according to different sewing requirements, transforming a static system into a dynamic one that can adapt to various cloth types and sewing methods while maintaining cutting precision.
Solution Approach 2:
The patent implements parameter changes by enabling adjustment of the thread margin parameter. Through the thread length adjustment mechanism, the thread margin can be changed from a fixed value to a variable parameter that can be optimized for different sewing applications, thereby improving both precision and adaptability.
2Device complexity
If a fixed thread margin is provided, then the device complexity is reduced, but the ease of operation for different sewing applications deteriorates
Solution Approach 1:
The patent applies universality by designing a thread cutting apparatus that can handle multiple sewing applications through a single adjustable mechanism. The thread length adjustment mechanism enables the same device to accommodate different cloth types and sewing methods, making the device multi-functional and easier to operate across various applications.
Solution Approach 2:
The dynamics principle is applied to make the thread margin adjustable, allowing operators to easily adapt the device to different sewing requirements without requiring multiple fixed configurations. This dynamic adjustment capability improves ease of operation while maintaining reasonable device complexity.
3Adaptability or versatility
If a thread length adjustment mechanism is added, then the adaptability to different cloth types is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the thread length adjustment mechanism with the existing thread cutting apparatus. The adjustment mechanism is combined with the thread capture members and cutting blade assembly, allowing the system to achieve enhanced versatility while minimizing the increase in overall device complexity through unified design.
Solution Approach 2:
The thread length adjustment mechanism is designed to serve multiple functions: it adjusts thread margin length, accommodates different cloth types, and works with various sewing methods. This multi-functionality justifies the added complexity by providing comprehensive adaptability across different applications.
Data Source
AI summary
A sewing machine is provided with a function of adjusting a thread margin remaining on a cloth side to be sewn to a desired amount. A sewing machine includes a cutting member and a thread length adjustment mechanism. The cutting member cuts an upper thread and a lower thread between a hole of a needle plate and the cutting member. The thread length adjustment mechanism adjusts the length of the upper thread and the lower thread extending from the hole of the needle plate up to the cutting member.