Sewing Machine Threading Lever Interlocking Mechanism
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Solution Overview
Problem
Conventional sewing machines face increased costs due to motor-driven presser position displacement mechanisms, which compromise operating efficiency by requiring users to manually adjust the presser position to avoid interference with the threading apparatus.
Innovation Solution
A sewing machine design featuring a manually operated threading lever, an elevating unit, and a lever interlocking mechanism that transmits operating force from the threading lever to the operating lever, allowing the presser to be raised and lowered independently of the threading operation, thus preventing interference and maintaining efficiency without a motor-driven system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor-driven mechanism is used to displace the presser position, then the presser can be automatically raised and lowered to avoid interference with the threading apparatus, but the cost of the sewing machine increases
Solution Approach 1:
The lever interlocking mechanism enables the threading apparatus itself to automatically return the presser to the pressing position during threading operation. The mechanism uses the threading lever's own motion to trigger the presser's automatic return, eliminating the need for external motor-driven systems while maintaining operational efficiency
Solution Approach 2:
The lever interlocking mechanism dynamically engages and disengages based on the threading lever's position. When the threading lever is pressed down, the interlocking mechanism engages to return the presser; when the threading lever is released, the interlocking mechanism disengages to allow free operation of the operating lever. This dynamic behavior provides automatic presser control without requiring continuous motor power
2Reliability
If the presser is kept at the pressing position during threading operation, then interference between the threading apparatus and presser is avoided, but the user must manually operate the operating lever before threading, reducing operating efficiency
Solution Approach 1:
The lever interlocking mechanism performs the presser return action in advance during the threading lever's downward motion, before the threading mechanism actually needs the presser in the pressing position. This preliminary action ensures the presser is already in the correct position when threading begins, preventing interference while eliminating the need for separate manual operations
Solution Approach 2:
The lever interlocking mechanism merges the threading lever's downward motion with the presser return function. By combining these two actions into a single integrated mechanism, the system achieves both interference avoidance and improved operating efficiency without requiring separate control steps
Data Source
AI summary
In a sewing machine, an elevating unit is configured to be integrally raised and lowered with a threading lever of a threading apparatus. Furthermore, an operating lever is coupled to a lever interlocking mechanism that interlocks with the rotational operation of the operating lever. Upon pressing threading lever downward from an initial position when operating lever is at an operating position, an elevating unit engages with lever interlocking mechanism. Operating force applied to threading lever is transmitted to operating lever via lever interlocking mechanism, thereby turning operating lever from operating position to non-operating position. Accordingly, even when a presser is at a raised position, by pressing threading lever downward, operating lever is turnable from operating position to non-operating position, thereby allowing presser to return to pressing position.