Bobbin Holder with Integrated Thread Cutting Blade
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Solution Overview
Problem
Existing bobbin holders for sewing machines require manual handling and cutting of lower threads, which can lead to thread detachment and incomplete winding due to the need for scissors to cut excess thread, posing safety risks and inefficiencies.
Innovation Solution
A bobbin holder with a built-in cutting mechanism, comprising a thread holding portion and a cutting blade within an opening, allows for automatic thread cutting and secure thread winding, utilizing a thread holding plate and arc-shaped ridges to guide and pinch the thread for precise cutting and holding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual handling and cutting of lower threads is used, then thread detachment and incomplete winding occur, but automation and efficiency are reduced
Solution Approach 1:
The patent combines the thread holding function and thread cutting function into a single integrated holder structure. The holder includes both a thread holding portion and a cutting blade that work together automatically during the bobbin winding process, eliminating the need for separate manual operations and ensuring reliable thread winding without detachment.
2Reliability
If scissors are used to cut excess thread, then thread detachment occurs, but device complexity increases
Solution Approach 1:
The cutting blade is integrated directly into the holder body, combining the cutting function with the holding function in a single component. This eliminates the need for separate scissors while maintaining simple structure through the unified design of the holder that includes both holding and cutting capabilities.
3Object-affected harmful factors
If thread is held by fingertips during winding, then safety risks increase, but ease of operation is reduced
Solution Approach 1:
The holder automatically performs the thread holding function through its built-in thread holding portion, eliminating the need for operator finger involvement. The device serves itself by mechanically securing the thread end during the winding process, ensuring operator safety while maintaining ease of operation through automatic functionality.
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 enables safe and efficient winding of lower threads around the bobbin using a sewing machine's rotation mechanism, preventing thread detachment and ensuring complete winding with minimal manual intervention, while securely cutting excess thread.
Implementation Method 1
a thread holding plate which makes contact with a lower surface of the thread holding portion and is formed of an elastic thin plate is provided
Data Source
AI summary
A bobbin holder that grasps a holder body and a flange of a bobbin that winds a thread n around the holder body, the holder including: an opening formed in an upper surface of the holder body; a thread holding portion that holds a thread n and is arranged in the opening so as to protrude from a center of the holder body toward an outer circumference of the holder body; and a cutting blade that cuts the thread held by the thread holding portion, the blade being disposed in one of regions inside the opening that is partitioned by the thread holding portion, wherein the cutting blade is disposed on a thread path of the thread n being pulled after the thread n, which is wound around the bobbin grasped by a grasping portion and is pulled from the other region inside the partitioned opening, is held by the thread holding portion.