Feed Dog Stabilizing Mechanism for Sewing Machines
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Solution Overview
Problem
Conventional sewing machines with feed dogs face inefficiencies due to insufficient support for the feed dogs, leading to unreliable biting and feeding of fabric, as the existing support mechanisms are prone to deformation and fail to maintain optimal fabric engagement.
Innovation Solution
A feed-dog stabilizing mechanism featuring a support member with abutting surfaces and a drive source with a driving arm, linkage rods, and a motor or electromagnet to pivotally support the feed dog, ensuring stable engagement and optimal fabric feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the feed dog is disposed in a suspended form below the presser foot with limited support distance, then the structure is simpler, but the supporting force is insufficient causing feed dog deformation and unreliable fabric biting
Solution Approach 1:
The support function is segmented into multiple components: the support member with first abutting surface directly supporting the feed dog, and the driving arm with second abutting surface providing additional support force. This segmentation allows each component to specialize in providing support, collectively ensuring reliable fabric biting without requiring a completely complex restructure of the feed dog assembly.
Solution Approach 2:
The support member acts as an intermediary component between the driving arm and the feed dog. It receives the driving force from the driving arm through the second abutting surface and transmits it to the feed dog through the first abutting surface, effectively amplifying and directing the support force to prevent feed dog deformation and ensure reliable fabric engagement.
2Ease of manufacture
If the feed table is fixed only by a fixing member to the inserting rod, then the assembly is easier to manufacture, but the feed table deforms under presser foot pressure causing feed dog instability
Solution Approach 1:
The support member provides localized quality enhancement by concentrating support force at the critical area where the feed dog contacts the fabric. The first abutting surface is positioned to directly support the feed dog's loading point, while the second abutting surface receives force from the driving arm, creating a localized reinforcement zone that prevents deformation without requiring complete redesign of the entire feed table structure.
3Force
If the driving arm pushes the second abutting surface to move the support member, then the feed dog receives adequate support force, but the mechanism becomes more complex
Solution Approach 1:
The support member is designed to pivot relative to the feed table, transitioning from a static support structure to a dynamic one. This pivoting capability allows the support member to adapt its angle and position based on the feed dog's movement and loading conditions, optimizing the transmission of support force from the driving arm while maintaining structural simplicity through a single degree of freedom.
Data Source
AI summary
A feed-dog stabilizing mechanism for a sewing machine essentially includes a support member and a drive source. The support member is disposed below a feed dog and driven to move by the drive source, so that the support member can push against the feed dog, and as a result, the height at which the fabric is bitten by the feed dog can be maintained during the course of fabric feeding to maintain the optimum feeding efficiency.