Rotating Ruler Guide for Sewing Machine Hopping Foot
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Solution Overview
Problem
Maneuverable sewing machines, such as quilting machines, make it difficult for users to accurately follow a path on the fabric, such as a seam or a desired pattern, due to the challenge of simultaneously maneuvering the machine and a ruler.
Innovation Solution
A hopping foot assembly with a rotating ruler guide that engages the edge of a ruler at two point-contact locations, allowing the needle to be aligned closely with the path defined by the ruler, while the rotating guide maintains engagement even when the ruler is curved or nonlinear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hopping foot and ruler are used to guide the needle along a path, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The hopping foot assembly is divided into distinct functional segments: a base portion that attaches to the sewing machine, a ruler guide portion that interfaces with the ruler, and a needle guide portion that directs the needle. This segmentation allows each component to perform its specific function independently, improving overall measurement precision while keeping individual components relatively simple.
Solution Approach 2:
The ruler guide portion acts as an intermediary element between the ruler and the needle guide. It includes contact surfaces that engage with the ruler edge and transfer the ruler's positional information to the needle, enabling accurate path following without requiring direct complex interaction between all components.
2Adaptability or versatility
If the ruler guide is fixed, then device complexity is reduced, but adaptability decreases when following curved or nonlinear paths
Solution Approach 1:
The ruler guide portion is designed with dynamic characteristics, allowing it to rotate or adjust its orientation relative to the base portion. This enables the guide to adapt to curved or nonlinear paths by changing its angular position, while the overall structure remains relatively simple through the use of rotational joints rather than complex articulated mechanisms.
Solution Approach 2:
The system allows for parameter changes in the ruler guide's orientation and position. By varying the angular parameter of the ruler guide relative to the base, the system can follow different path geometries including curves and nonlinear trajectories, providing versatility without requiring a completely different structure for each path type.
3Ease of operation
If the needle opening is large, then ease of operation is improved, but manufacturing precision of the needle path decreases
Solution Approach 1:
The needle guide portion provides a localized precise guidance path for the needle within the larger opening. While the overall opening may be sufficiently large for visibility and access, the critical region where the needle passes is precisely defined by the guide structure, ensuring accurate needle path control without sacrificing ease of operation.
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
The solution enables users to easily guide the needle along intricate patterns with improved accuracy and ease of use, as the rotating ruler guide maintains alignment with the ruler edge, reducing the need for manual repositioning.
Implementation Method 1
The rotating ruler guide may comprise a bearing and a guide attachment. The bearing may be coupled to the inner surface of the hopping foot base. The bearing may be configured to rotate about the axis of the hopping foot assembly.
Data Source
AI summary
A hopping foot assembly for a sewing machine having a needle comprises a hopping foot base and a hopping foot arm. The hopping foot base is shaped to include a needle opening that extends axially therethrough relative to an axis. The hopping foot arm extends from the hopping foot base. The hopping foot arm is configured to be coupled to the sewing machine to fix the hopping foot base relative to the sewing machine.