Sewing Machine Foot With Swing Arm For Fastener Guidance
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Solution Overview
Problem
Conventional sewing machine feet struggle with securely guiding the element row of a slide fastener during sewing, especially on thick fabrics like leather, leading to instability in the seam position and difficulty in maintaining the interval between the fastener elements and the sewing line, resulting in potential defects such as seam slippage and exposure of fastener elements.
Innovation Solution
A sewing machine foot with a swing arm and element guide groove that moves interlockingly with the foot mounting portion, featuring an urging mechanism to maintain the interval between the element row and the sewing line, and an element inverting portion to manage the U-shaped fastener elements, ensuring continuous guidance and accurate positioning even on thick fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sewing machine foot with a fixed intermediate partitioning portion is used, then the structure is simple and easy to manufacture, but the element row of the slide fastener cannot be stably guided on thick fabrics, causing seam slippage and position instability
Solution Approach 1:
The intermediate partitioning portion is changed from a fixed structure to a swingable structure that can dynamically adjust its position. The swing arm rotates around a pivot shaft to follow the contour of thick fabrics, maintaining continuous contact with the element row and ensuring stable guidance throughout the sewing process.
Solution Approach 2:
The sewing machine foot is divided into separate functional components: a foot mounting portion, a swing arm with element guide groove, and an urging means. This segmentation allows the swing arm to independently move and adapt to fabric thickness variations while other components remain stable.
2Manufacturing precision
If the intermediate partitioning portion is made swingable to follow fabric contour, then the guidance stability on thick fabric is improved, but the mechanism complexity and device structure increase
Solution Approach 1:
The swing arm utilizes the natural contour of the fabric itself to drive its movement. As the fabric passes through, its thickness variations automatically cause the swing arm to rotate and adjust its position, eliminating the need for complex external actuation mechanisms.
Solution Approach 2:
The urging means acts as an intermediary that maintains appropriate contact pressure between the swing arm and the element row. It ensures the swing arm follows the fabric contour closely without excessive pressure that could damage the fastener elements or fabric.
3Adaptability or versatility
If a fixed pressing force is applied by the intermediate partitioning portion, then the structure is simple, but it cannot adapt to changes in fabric thickness, causing loss of contact with the element row
Solution Approach 1:
The pressing force parameter is made variable through the swing arm mechanism. As the swing arm rotates to follow fabric contour, the contact pressure automatically adjusts to match fabric thickness variations, maintaining optimal engagement with the element row throughout the sewing process.
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 ensures stable guidance of the element row during both piercing and seam formation, preventing seam defects and maintaining the desired interval between the fastener elements and the sewing line, even on thick fabrics like leather, thereby enhancing sewing precision and quality.
Implementation Method 1
urging means for urging the swing arm to the sewing object product
Data Source
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AI summary
A sewing machine foot of the invention includes: a foot mounting portion (44) for fixing to a pressing rod (14) of a sewing machine; a pressing portion (46) for pressing a sewing object product when a sewing needle (12) pieces; and an element guide groove (46) for guiding an element row (9) of a slide fastener (8) by inserting the element row therein, the sewing machine further including: a swing arm (47) which is supported by a foot mounting portion (44) swingablly relative to the foot mounting portion (44) and swings in a vertical plane parallel to a sewing line (28) at the time of sewing; and urging means (52) disposed between the foot mounting portion (44) and the swing arm (47), for urging the swing arm (47) to the sewing object product relative to the foot mounting portion (44). Consequently, the element row (9) of the slide fastener (8) can be guided both when the sewing needle (12) pierces and when a seam is formed, so that a thick fabric (6) and a concealed slide fastener (8) which are difficult to sew together can be positioned accurately and sewed together.