Needle Threader Pressing Mechanism for Thread Loop Stability
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Solution Overview
Problem
Conventional needle threaders require users to manually hold and pull a loop of thread through the needle eye, which can be fiddly and prone to accidental slippage, necessitating repeated setup and operation.
Innovation Solution
A needle threader with a thread pressing mechanism that includes a pressure receiving part and a pressing member, which is moved to press the loop of thread against the pressure receiving part when the operation element is activated, ensuring the thread remains in place and simplifying the threading process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional needle threader is used to form a loop of thread, then the thread is inserted through the needle eye, but the loop extends several millimeters and requires manual handling which is fiddly and prone to slippage
Solution Approach 1:
The patent applies preliminary action by providing a thread guiding part that pre-positions and guides the thread end after the threading member forms the loop. The guiding part includes a guide hole and guide surface that automatically direct the thread end toward the needle eye, eliminating the need for manual manipulation and preventing slippage before the thread is fully threaded.
Solution Approach 2:
The thread guiding part acts as an intermediary between the threading member and the needle eye. It receives the thread end from the threading member and transfers it to the needle eye through the guide hole, providing a smooth transition and eliminating direct manual handling of the thread loop.
2Productivity
If manual manipulation of the thread loop is required, then the threading process can be completed, but the work must be repeated if the loop slips out
Solution Approach 1:
The thread guiding part performs preliminary guidance of the thread end through the guide hole and along the guide surface, ensuring the thread is properly positioned before the user needs to pull it through. This preliminary action prevents slippage and eliminates the need for repeated setup, improving productivity and reducing time loss.
Solution Approach 2:
The threading device performs self-service by automatically guiding the thread end through the guide hole and positioning it for pulling through the needle eye. The guide surface and guide hole work together to self-correct any mispositioning, reducing the need for manual intervention and repeated operations.
3Ease of operation
If the loop of thread is held with fingers to pull the thread end through, then threading can be completed, but this is fiddly work and may cause accidental slippage
Solution Approach 1:
The thread guiding part performs preliminary guidance of the thread end through the guide hole and along the guide surface, positioning it optimally for pulling through the needle eye. This preliminary action makes the final pulling step easier and more reliable, while the added complexity of the guiding part is minimal compared to the improvement in ease of operation.
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 thread pressing mechanism securely holds the loop of thread, preventing accidental slippage and allowing for easy completion of threading without manual manipulation, enhancing usability and reducing the need for repeated setup.
Implementation Method 1
a biasing member that urges the pressing member toward the first position
Data Source
AI summary
A needle threader includes: a needle holding part for holding a needle having a needle eye; a threading member movable between a retracted position separated from the needle holding part and an advanced position for inserting a thread loop through the needle eye by entering the needle eye; an actuator mechanism including an operation element, to move the threading member to the retracted position in a first state (not operating) and move to the advanced position in a second state (operating); and a thread pressing mechanism for pressing the thread loop inserted through the needle eye by the threading member. The thread pressing mechanism includes a pressure receiving part, a pressing member, and a biasing member. Switching the operation element from the second state to the first state, the pressing member can press the thread loop against the pressure receiving part.