Curved Intermediate Plate Structure for Lightweight Sewing Frames
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Solution Overview
Problem
Existing sewing machine frames struggle to achieve both rigidity and lightweightness, as increasing the thickness or number of ribs to enhance rigidity compromises their lightweight design.
Innovation Solution
Incorporating a pillar frame with extending plates and intermediate plates that have curved surfaces, which extend in both longitudinal and orthogonal directions, to enhance rigidity without significantly increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the sewing machine frame is increased to secure rigidity, then the rigidity of the sewing machine frame is improved, but the lightweightness is impaired
Solution Approach 1:
The extending intermediate plate is configured with a curved surface instead of a flat surface. This curvature increases the moment of inertia of the plate's cross-section, thereby enhancing the rigidity of the extending frame without requiring increased thickness or additional material, thus maintaining lightweightness while improving structural stiffness.
2Strength
If the number of ribs is increased to enhance rigidity, then the rigidity of the sewing machine frame is improved, but the lightweightness is impaired
Solution Approach 1:
The extending intermediate plate incorporates a curved surface configuration that inherently provides greater structural rigidity compared to flat plates. This geometric optimization eliminates the need for additional ribs or thickening, achieving enhanced rigidity through shape design rather than material quantity increase.
3Ease of manufacture
If the extending intermediate plate has only flat surfaces, then the manufacturing is simpler, but the rigidity of the extending frame is insufficient
Solution Approach 1:
The extending intermediate plate is designed with a curved surface that can be formed through conventional molding or bending processes. This curvature provides significant rigidity enhancement while remaining compatible with standard manufacturing techniques, achieving a balance between manufacturing ease and structural performance.
Data Source
AI summary
A sewing machine frame includes a pillar frame and an extending frame. The extending frame extends from one end in a longitudinal direction of the pillar frame, in an extending direction orthogonal to the longitudinal direction. The extending frame includes a first extending plate, a second extending plate, and an extending intermediate plate. The first extending plate extends in the extending direction. The second extending plate is separated from the first extending plate in the longitudinal direction. The second extending plate faces the first extending plate and extends in the extending direction. The extending intermediate plate extends in the longitudinal direction and the extending direction. The extending intermediate plate couples the first extending plate and the second extending plate in the longitudinal direction, and the extending intermediate plate has a curved surface.