Gas-Driven Sewing Machine Looper Threading Mechanism
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Solution Overview
Problem
Existing looper threading devices for sewing machines, such as sergers and cover stitch machines, require complex operations and multiple hand movements, making them difficult for operators to perform one-handed threading efficiently and accurately.
Innovation Solution
A gas carrying threading device with a push button shaft, set shaft, and control pin mechanism, along with a connecting movement plate and cam structure, allows for one-handed three-operation threading by simplifying the mechanism and using pressurized gas for easy thread insertion and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional gas carrying threading device is used, then the threading pathway becomes simple and thread entanglement is reduced, but the operation becomes complex requiring both hands to concurrently perform multiple actions
Solution Approach 1:
The push button shaft is designed with nested components where the set shaft with large and small diameter portions is inserted into the stopper shaft, and the control pin protrudes from the stopper shaft. This nested structure allows multiple functions to be integrated into a single compact assembly that can be operated with one hand.
Solution Approach 2:
The connecting movement plate serves multiple functions: it holds both the set shaft and stopper shaft, receives the control pin movement, and interfaces with the cam mechanism. This multi-functional component reduces the overall number of parts needed while maintaining the threading functionality.
2Adaptability or versatility
If a looper threading device with separate looper, drive arm, and thread guide plate is used, then the threading mechanism becomes complicated and requires multiple operations
Solution Approach 1:
The looper, looper drive arm, and thread guide plate are merged into an integrated assembly that moves together as a single unit controlled by the push button shaft. This combination simplifies the mechanism by eliminating the need for separate control of each component while maintaining threading flexibility.
Solution Approach 2:
The cam mechanism is pre-configured with control groove cam portions that automatically guide the control pin through the correct sequence of movements. This preliminary design of the cam paths ensures that the threading operations occur in the proper sequence without requiring complex control logic or multiple manual steps.
3Productivity
If manual threading operation is performed without power disconnection, then the threading can be performed continuously, but the serger may break down due to incorrect motor operation
Solution Approach 1:
The cam mechanism provides mechanical feedback through the control pin position to the push button shaft system. The control groove cam portions are designed to automatically return the control pin to its initial position after threading completion, providing feedback that the threading cycle is complete and the motor can be safely reactivated.
Solution Approach 2:
The cam mechanism automatically manages the power disconnection and reconnection sequence through the control pin's movement along the predetermined cam paths. The system self-regulates the motor operation states without requiring external monitoring or control, ensuring safety while maintaining productivity.
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 easy, mistake-free, and efficient one-handed threading with reduced risk of thread entanglement or breakage, and prevents serger breakdowns due to incorrect motor operation by disconnecting power when necessary.
Implementation Method 1
feeds a looper thread by utilizing a flow of a pressurized gas which is supplied to the hollow looper thread guide
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A threading to a looper is performed with one-touch operation. A looper threading/sewing changeover mechanism 30 including a push button 33 for a pressing operation of a push button shaft 32 that a control pin 31 is protruded and provided, a control groove cam 38 which includes a first control groove cam portion 34 - a fourth control groove cam portion 37 which receive the control pin, a connecting movement plate 40 which supports a thread guide portion and which is elastically repelled toward a threading state that a thread guide outlet of the thread guide portion contacts to a looper thread inlet of the looper by a first spring 39, and a connecting positioning plate 82 which rotates together with a main shaft 2 integrally and has a peripheral surface 80 that a tip portion 41 of the push button shaft contacts and has a notch portion 81 that the tip portion of the push button shaft is fitted is provided.