Stuffed Object Outer Seam Structure for Bite-Resistant Stitching
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Solution Overview
Problem
Existing stuffed objects, such as toys, experience seam slippage and broken stitches at weaker stitching positions, leading to open seams and filler loss, reducing their durability and making them unsuitable for pets due to biting and pulling.
Innovation Solution
A sewing method involving multiple interlaced and intervallic arranged needle points and stitching threads to form reinforced seams, including a first seam with parallel edges and a second seam with a bar-tack structure, enhancing the stitching strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single stitching process is used to join fabric components, then the manufacturing process is simple, but the seam strength is insufficient leading to slippage and broken stitches
Solution Approach 1:
The single stitching process is divided into multiple sequential stitching processes. The first stitching process joins the first and second fabric components to form a first seam. The second stitching process joins the same fabric components to form a second seam that overlaps with the first seam, creating reinforced stitching with increased seam strength.
Solution Approach 2:
The first seam is formed in advance before the second seam is created. The second stitching process is then applied to the already-stitched area, reinforcing the existing seam structure and distributing stress across multiple stitch lines, thereby preventing slippage and broken stitches.
2Duration of action of stationary object
If standard stitching is used, then the manufacturing process is simple, but the durability of the stuffed object is reduced due to open seams and filler loss
Solution Approach 1:
The manufacturing process is segmented into multiple stitching operations. The first stitching process creates an initial seam structure, and the second stitching process adds reinforcement by creating an overlapping seam. This segmented approach significantly improves durability by preventing open seams and filler loss, making the stuffed object suitable for demanding applications like pet toys.
3Force
If single-layer stitching is used, then the structure is simple, but the seam cannot withstand strong forces from pet biting and pulling
Solution Approach 1:
Two separate stitching processes are merged into a single manufacturing workflow. The first seam and second seam are both formed on the same fabric components in sequence, creating a combined stitching structure that distributes and withstands strong forces from pet biting and pulling through overlapping reinforcement.
Data Source
AI summary
The present invention provides an outer layer structure of a stuffed object, comprising a first fabric component and a second fabric component fastened to each other substantially to form a container; a first stitching thread extended from a first end of an opening of the container to a second end of the opening so a first edge and a second edge of the container corresponds to each other and the opening is stitched and fastened by the first stitching thread, and thereby a first seam is formed at the opening; a second stitching thread extended from a first end of a third edge or a first end of a fourth edge of the first seam to a second end of a third edge or a second end of a fourth edge so the third edge and the fourth edge correspond and are fastened to each other to form a second seam. The present invention also provides a sewing method for a stuffed object with the outer layer structure.