Dual-Mode Presser Foot Assembly for Accurate Path Following
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Solution Overview
Problem
Maneuverable sewing machines face challenges in accurately following a path on fabric, such as a seam or ditch line, due to difficulty in aligning the presser foot with the feed dog, making it hard to create intricate patterns.
Innovation Solution
A sewing machine assembly that can switch between free motion and fixed motion modes, featuring a presser foot assembly with an auxiliary presser bar and mount that aligns with the feed dog, and a bias element to urge the presser foot toward the frame base, allowing seamless transitions between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a maneuverable sewing machine is used to create intricate patterns, then the ability to create intricate patterns is improved, but the difficulty in accurately following a path on the fabric increases
Solution Approach 1:
The presser foot assembly is made dynamically adjustable between two configurations: a first configuration for free motion quilting where the presser foot is spaced from the presser bar to allow manual fabric manipulation, and a second configuration for precise path following where the presser foot is positioned near the presser bar. This dynamic reconfiguration enables the machine to adapt to different operational requirements, resolving the contradiction between pattern creation versatility and path following accuracy.
2Adaptability or versatility
If a single sewing machine is used for both free motion and fixed motion modes, then the need for multiple machines is reduced, but the complexity of the sewing machine assembly increases
Solution Approach 1:
The presser foot assembly is designed with multi-functionality to perform both free motion quilting and precise path following operations within a single sewing machine. By incorporating an adjustable positioning mechanism that allows the presser foot to be positioned in either a spaced configuration (for free motion) or a positioned configuration (for precise stitching), the assembly achieves universal functionality without requiring separate machines, thereby managing complexity through integrated design.
Data Source
AI summary
A sewing machine assembly includes a sewing machine frame, a main presser bar, and a presser foot assembly. The sewing machine frame includes a frame base, a frame body that extends from the frame base, a frame head coupled to the frame body that extends from the frame body toward the frame base. The main presser bar is mounted to the frame head of the sewing machine frame. The presser foot assembly includes an auxiliary presser bar offset from the main presser bar.