Microstructured Feed Dog Surface for Slippery Fabric Handling
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Solution Overview
Problem
Conventional sewing machines face challenges in efficiently advancing and managing thin or slippery fabrics, leading to fabric bunching, slippage, and damage due to inadequate feed dog performance, resulting in undesirable seams and material waste.
Innovation Solution
A microstructured surface with pillars of specific dimensions and arrangements is applied to sewing machine feed dogs and gloves, providing high friction in the horizontal direction to improve fabric handling and reduce bunching, while maintaining low friction vertically to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional feed dogs with metal serrated teeth are used, then fabric can be gripped and advanced, but thin or slippery fabrics experience slippage, bunching, and damage due to inadequate friction and excessive pressure
Solution Approach 1:
The invention changes the physical parameters of the feed dog surface by replacing conventional metal serrated teeth with microstructured surfaces having specific pillar dimensions (50-1200 μm height, 70-300 μm width) and spacing (200-600 μm). This parameter change creates optimal friction characteristics for thin and slippery fabrics without causing damage
Solution Approach 2:
The microstructured surface applies different friction characteristics to different fabric types locally. The pillar structure provides high friction for slippery fabrics while maintaining appropriate grip for other materials, allowing the same feed dog to handle diverse fabric types effectively
2Productivity
If increased pressure is applied by feed dogs to advance fabric, then fabric advancement improves, but fabric damage and bunching increase
Solution Approach 1:
The invention changes the pressure distribution parameters by using microstructured pillars instead of continuous metal surfaces. The pillars contact fabric at discrete points, distributing pressure evenly and preventing localized stress concentrations that cause fabric damage while maintaining effective advancement
3Ease of manufacture
If conventional feed dog surfaces are used, then manufacturing is simple, but friction against thin or slippery fabrics is insufficient leading to slippage
Solution Approach 1:
The invention changes the surface geometry parameters to create microstructured pillars with specific dimensions and arrangements. These parameters are optimized to maximize friction force against slippery fabrics while remaining compatible with standard manufacturing processes like injection molding or surface treatment
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 microstructured surface enhances fabric advancement, reduces operator effort, and improves seam consistency, increasing productivity and reducing material waste by providing uniform and high friction against fabrics, even when using thin or stretchy materials.
Implementation Method 1
A microstructured surface with pillars of specific dimensions and arrangements is applied to sewing machine feed dogs and gloves, providing high friction in the horizontal direction to improve fabric handling and reduce bunching, while maintaining low friction vertically to prevent damage.
Data Source
AI summary
This invention is directed to an improved contact surface for manipulating articles wherein the microstructure included on the contact surface having a plurality of pillars spaced apart in the range of 200 μm and 600 μm, having a height in the range of 50 μm and 1200 μm, a width of in the range of 70 μm and 300 μm, a wall draft angle between 0° and 15°, a density of in the range of 5,000 to 20,000 pillars per square inch, and a friction rating greater than 7. The contact surface can be included on a sewing machine feed dog, a glove, sporting equipment, firearm grip, hand rail, tool grip, tool handle, and a strap such as for a satchel or backpack.