Free Motion Sewing Disks with Composite Foam Layers
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Solution Overview
Problem
Free motion quilting requires manual control of fabric movement over a sewing machine, which is challenging due to the need for constant grip and repositioning, especially with different fabric textures and the requirement to keep fingertips exposed for needle manipulation.
Innovation Solution
The use of two flat disks with different fabric gripping surfaces, composed of stacked layers of open cell EVA foam, expanded PVC plastic, and soft closed cell foam, allows for improved control of fabric movement by distributing forces and adjusting to varying frictional coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber or latex gloves are worn to improve fabric gripping, then fabric control is improved, but fingertip exposure is lost requiring glove removal
Solution Approach 1:
The fabric control function is segmented from the hand by introducing disks as intermediate tools. The disks are held in the hands while the fabric is controlled through the disks, separating the gripping function from direct hand contact and eliminating the need for gloves while maintaining fabric control.
Solution Approach 2:
Disks serve as intermediary objects between the hands and the fabric. These disks provide the friction and grip needed to control fabric movement while allowing fingertips to remain exposed and visible, mediating the interaction between hand and fabric without requiring glove removal.
2Ease of operation
If hands are used to directly hold and move fabric, then fabric control is possible, but hand fatigue increases due to constant gripping and repositioning
Solution Approach 1:
The disks act as mediators that distribute the mechanical stress and gripping forces away from the hands. By holding the disks rather than directly gripping the fabric, the hands experience reduced fatigue while maintaining effective control over fabric movement throughout extended sewing sessions.
Solution Approach 2:
The disks change the physical parameters of the interaction by providing a larger surface area and different friction characteristics compared to direct hand contact. This alters how forces are distributed and applied to the fabric, reducing the strain on the hands while maintaining control effectiveness.
3Reliability
If pins are used to attach fabric layers, then fabric layer attachment is improved, but sewing continuity is interrupted requiring machine stoppage
Solution Approach 1:
The attachment function is extracted from the sewing process by using separate adhesive products applied before sewing. This removes pins and their associated interruptions from the sewing operation, allowing continuous machine operation while maintaining fabric layer attachment through the adhesive bonding already in place.
4Adaptability or versatility
If disks with contact layers are used to grip fabric, then fabric control for different materials is improved, but device complexity increases with multiple layers
Solution Approach 1:
The disks utilize composite material construction with different contact layers (such as rubber, leather, or fabric-covered surfaces) bonded to a rigid base. This composite structure provides versatility for controlling different fabric materials while keeping the overall device relatively simple and manageable.
Solution Approach 2:
The disks are designed as universal tools that can control various fabric types through different contact layer options. By making the disks multi-functional with interchangeable or varied surface treatments, they reduce the need for multiple specialized tools while maintaining adaptability to different fabric materials.
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 easier and more controlled movement of fabrics with different materials over a sewing machine, maintaining fingertip exposure for needle access and reducing hand fatigue during free motion sewing.
Implementation Method 1
the first contact layer is made of open cell EVA foam, the intermediate stiffener layer is made of expanded PVC plastic, and the second contact layer is made of soft, closed cell foam
Data Source
AI summary
A set of sewing disks for controlling the movement of a piece of fabric over the free arm and under the needle of a sewing or quilting machine. Each disk is flat and has an oval or circular configuration and comprises three registered, stacked adhesively attached layers—a first contact layer made of open cell foam, a semi-rigid intermediate stiffener member, and a second contact layer made of closed cell foam. When each disk is placed over a piece of fabric with the lower contact layer is placed adjacent thereto, the individual's fingers are exposed at all times and placed over the opposite contact layer. The intermediate stiffener layer spreads and evenly dissipates the forces exerted by the fingers to the top contact layer to the lower contact layer. Because the finger tips are not in contact with the fabric, soiling of the fabric by the finger tips is prevented.