Sewing Machine Threading Device Hermetic Lip Suction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pneumatic needle threading devices using gas suction form face issues with incomplete connection between peripheral parts and the needle eye, leading to insufficient suction power, making them impractical for market implementation.
Innovation Solution
A pneumatic threading device with a hermetic lip that closely touches the needle's peripheral band-ring-shaped region, a suction conduit pipe, and a position switching mechanism to align the suction port hole with the needle eye, ensuring efficient suction of the needle thread using a sewing machine motor-driven pump, while also allowing for looper threading with exhaust form using the same pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pneumatic needle threading device uses gas suction form, then the needle threading can be performed with relatively stable state, but the suction power is insufficient due to incomplete connection between peripheral part and needle eye
Solution Approach 1:
The patent employs a flexible membrane (diaphragm) as the connection structure between the peripheral part and needle eye. This flexible film maintains hermetic sealing while accommodating positional variations, ensuring both reliable threading stability and sufficient suction power by preventing gas leakage that would otherwise reduce suction effectiveness
Solution Approach 2:
The patent introduces a flexible membrane as an intermediary element between the suction port and needle eye. This mediator transmits the suction force effectively while maintaining a hermetic seal, resolving the contradiction by enabling both stable threading through consistent sealing and sufficient suction power through efficient force transmission
2Device complexity
If the peripheral part surrounding the needle eye is not connected closely, then the structure is simpler, but the suction amount is insufficient for threading the needle thread
Solution Approach 1:
The flexible membrane provides a hermetic connection with minimal structural complexity. Instead of complex rigid connection mechanisms, the flexible film naturally conforms to the needle eye shape, achieving both simple structure and sufficient suction amount by eliminating gas leakage paths
3Device complexity
If a single pump is used for both needle threading and looper threading, then the device is more compact and cost-effective, but the pump must handle different threading requirements
Solution Approach 1:
The patent uses a dynamic switching mechanism that redirects the pump's gas flow to different targets (needle eye or looper hole) based on threading requirements. This dynamic flow control allows a single pump to adapt to different threading operations, maintaining device simplicity while achieving versatile functionality
Solution Approach 2:
The single pump is designed with multi-functionality to perform both needle threading and looper threading operations. By incorporating flow switching mechanisms, the same pump serves multiple purposes, reducing device complexity and cost while maintaining adaptability to different threading needs
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
Enables effective pneumatic needle threading with sufficient suction power from the needle eye and reduces fluid resistance, allowing for both needle and looper threading using a single pump driven by a sewing machine motor, enhancing the practicality and efficiency of the threading process.
Implementation Method 1
a pump that the needle thread suction conduit pipe is connected to an suction port and performs the needle threading to the needle eye of the needle by sucking one end of the needle thread
Implementation Method 2
by sucking one end of the needle thread which is inserted to a thread entrance of the needle eye of the needle to the suction port via the suction port hole from the thread exit of the needle eye of the needle
Data Source
AI summary
A sewing machine threading device includes: hermetic lips capable of making hermetic contact with a peripheral band-ring-shaped region of needles surrounding thread exits of needle eye, and which further includes a peripheral band-ring-shaped pad which surrounds suction port holes which draw in air from the thread exits of the needle eyes; a needle thread suction conduit pipe connected to the suction port holes; a position switching mechanism which moves the hermetic lips to a threading position such that the hermetic lips are in contact with the needle with the suction port holes being aligned with the thread exits, and, when forming a stitch, retracts the hermetic lips from the needle and moves said hermetic lips to a standby position; and a pump which takes in one end of the thread to be inserted into thread entrances of the needle eyes.