Sewing Machine Presser Foot Pressure Adjustment Structure
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Solution Overview
Problem
Conventional pressure adjustment structures for sewing machine presser feet are complex, unstable, and difficult to control, with indirect pressure application leading to structural distortion and limited strength due to the use of folded plate-shaped connecting bars and pivot shafts.
Innovation Solution
A pressure adjustment structure featuring a slidably mounted pressing member on a main supporting frame connected to a horizontal arm, with a direct driving mechanism using an adjustment element to press an elastic member, and additional vertical support from a second frame for enhanced stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a folded plate-shaped connecting bar with pivot shaft is used, then the pressure adjustment mechanism can be implemented, but the structure becomes complex and stability is limited
Solution Approach 1:
The patent extracts and eliminates the complex folded plate-shaped connecting bar and pivot shaft mechanism from the design. Instead, it uses a simple linear pressing member that slides directly on the supporting frame, removing unnecessary intermediate components and simplifying the overall structure while maintaining the pressure adjustment function.
Solution Approach 2:
The pressing member is divided into distinct functional parts: a pressing portion that contacts the elastic member and a pressing body that receives direct drive from the adjustment element. This segmentation allows each part to perform its specific function efficiently without the complexity of interconnected folded plates and pivot shafts.
2Ease of operation
If indirect pressure application through rotating connecting bar is used, then pressure adjustment is possible, but pressure control becomes difficult and unstable
Solution Approach 1:
The pressing member serves as a direct intermediary between the adjustment element and the elastic member. It transmits force linearly without intermediate rotational movements or gaskets, ensuring stable and controllable pressure adjustment. The pressing member's sliding motion provides a direct mechanical relationship that eliminates the instability caused by indirect rotation-based mechanisms.
3Ease of manufacture
If adjustment element is pivotally connected only by nuts through holes, then assembly is simple, but structural strength is limited and distortion occurs
Solution Approach 1:
The supporting frame is extended in the vertical dimension by adding a second supporting frame. This vertical extension provides additional support forces from multiple directions, significantly strengthening the structure without complicating the horizontal assembly process. The nuts-and-bolts connection is retained for ease of assembly, but the three-dimensional frame structure compensates for the limited connection strength.
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
This solution allows for direct and stable adjustment of elastic prestress, simplifies assembly, and increases structural strength by providing support from multiple directions, resulting in improved pressure control and reduced distortion.
Implementation Method 1
an elastic member 15 which is mounted on the presser bar 13... the pressing member can be driven by the adjustment element directly to press the elastic member so as to adjust an elastic prestress of the elastic member
Data Source
AI summary
A pressure adjustment structure for a presser foot of a sewing machine, wherein one end of a horizontal arm of the sewing machine is disposed with a presser bar of the presser foot, and an elastic member is mounted on the presser bar. The end of the horizontal arm is provided with a main supporting frame, so that the pressing member slides on the main supporting frame with a pressing body and a guiding member, and one end of the pressing member presses an elastic member. In addition, the pressing body extends towards and is driven by an adjustment element of the main supporting frame, so that the pressing member driven by the pressing body slides on the main supporting frame to press the elastic member so as to provide different pressure. A second supporting frame is disposed on the main supporting frame to connect with the horizontal arm.