Sewing Hopping Foot Assembly Rotating Guide Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Maneuverable sewing machines face challenges in accurately following a path on fabric, such as a seam or ditch line, due to the difficulty in simultaneously maneuvering the machine and a ruler, which is required for guidance.
Innovation Solution
A hopping foot assembly with a rotating guide that includes a bearing, guide insert, and passive drive system, allowing the needle to self-align with the stitching path without a ruler, by rotating relative to the hopping foot base and using guide lines and pointers for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a ruler is used to guide the needle along a path, then stitching accuracy is improved, but the complexity of simultaneous maneuvering increases
Solution Approach 1:
The rotating guide acts as an intermediary device between the ruler and the needle. It receives guidance from the ruler through its guide lines while simultaneously providing rotational adjustment capability, allowing the needle to follow the path without requiring the user to manually coordinate both ruler positioning and machine maneuvering.
Solution Approach 2:
The rotating guide is designed to rotate freely about a vertical axis, allowing it to dynamically adjust its orientation in response to fabric movement or machine direction changes. This dynamic capability enables the guide lines to remain aligned with the stitching path even as the machine moves, eliminating the need for constant manual repositioning.
2Adaptability or versatility
If the machine is maneuvered to follow a path, then stitching flexibility is improved, but alignment precision deteriorates
Solution Approach 1:
The rotating guide's ability to rotate freely allows it to adapt to changes in machine direction and fabric movement. As the machine maneuvers along curved or angled paths, the guide rotates to maintain alignment between the guide lines and the desired stitching path, preserving accuracy while enabling flexibility.
Solution Approach 2:
The rotating guide automatically adjusts its orientation through rotation about the vertical axis in response to movement of the fabric or sewing machine. This self-adjusting mechanism eliminates the need for constant manual intervention to maintain alignment, allowing the system to serve itself in maintaining path accuracy during flexible maneuvering.
3Measurement precision
If a rotating guide with passive drive system is added, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The passive drive system utilizes the natural movement of the fabric or sewing machine to automatically rotate the guide into the correct orientation. No external power source, motors, or complex control mechanisms are required - the system harnesses the existing motion in the sewing process to drive the rotation, thereby improving alignment without adding significant complexity.
Solution Approach 2:
The passive drive system acts as an intermediary mechanism that translates the movement of the fabric or machine into rotational motion of the guide. This intermediary component simplifies the overall system by using mechanical advantage and motion transfer rather than requiring direct active control, thereby achieving precise alignment with minimal added complexity.
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
Enables accurate alignment and following of stitching paths without the need for a ruler, allowing users to create intricate patterns with ease and precision, as the rotating guide adjusts to changes in machine direction and fabric movement.
Implementation Method 1
The passive drive system may comprise a chassis, a wheel, and a spring. The wheel may be configured to rotate about a wheel axis perpendicular to the axis of the rotating guide. The spring may be located between the bearing and the chassis. The spring may be configured to bias the wheel into engagement with the fabric during use of the sewing machine.
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 extends axially from the hopping foot base relative to an axis. The hopping foot base is shaped to include an opening that extends axially through the hopping foot base relative to the axis. The hopping foot arm is configured to be coupled to the sewing machine to fix the hopping foot base relative to the sewing machine.