Fastener Stringer Attachment Structure for Pants
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Solution Overview
Problem
Conventional fastener stringer attachment structures for pants result in a thick periphery at the side edge of the lower front body, leading to a less beautiful silhouette and reduced fit feeling, along with increased manufacturing costs due to multiple superposed fabrics and complex sewing.
Innovation Solution
A fastener stringer attachment structure where the fastener tape is sewn to the upper surface of the lower side fabric with a one-seam sewing thread, positioning the fastener element inside the fabric edge, reducing the number of superposed fabrics and using a narrower fastener tape (3 mm to 10 mm) to minimize fabric thickness and sewing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If five fabrics are superposed at the lower front body side edge portion, then the fastener tape is secured and prevented from flapping, but the periphery becomes thick and the silhouette becomes less beautiful
Solution Approach 1:
The invention extracts and eliminates unnecessary folded portions and fabric layers from the conventional five-layer construction. By removing the folded portion at the side edge portion and reducing the number of superposed fabrics, the patent achieves a thinner profile while maintaining fastener stability through alternative securing methods.
Solution Approach 2:
The patent changes the structural parameters of the fastener attachment by reducing the number of fabric layers from five to three, and by positioning the fastener tape differently (without requiring it to be superposed over folded portions). This parameter change directly reduces the thickness at the side edge portion while maintaining functional integrity.
2Reliability
If five fabrics are superposed at the lower front body side edge portion, then the fastener tape is secured, but the manufacturing cost increases due to many sewn portions
Solution Approach 1:
The invention extracts and eliminates unnecessary sewing operations by removing the folded portion structure. This reduces the number of sewn portions from multiple seams to fewer seams, directly lowering manufacturing complexity and cost while maintaining fastener security.
Solution Approach 2:
The patent merges the fastener tape attachment with the main seam construction, eliminating the need for separate folded portion sewing operations. By integrating the fastener securing function into the primary stitching structure, the number of distinct sewing steps is reduced.
3Device complexity
If the end edges of the folded portion, fastener tape, and fly fabrics are disposed at the same position, then the structure is simplified, but the fabric amount changes greatly and the silhouette becomes less beautiful
Solution Approach 1:
The patent applies local quality by creating an asymmetric arrangement where the fastener tape and fly fabric end edges are positioned at different locations. This local differentiation in positioning allows for better fabric amount distribution and a more aesthetically pleasing silhouette, rather than uniform positioning throughout.
Data Source
AI summary
Provided is a fastener stringer attachment structure which can provide an attractive pants silhouette, improve the fit of the pants, and furthermore, reduce the manufacturing cost of the pants by reducing the number of superposed fabrics at a side edge section of a lower front bodice. A fastener tape of a fastener stringer is sewn with a sewing thread to the upper surface of a lower side fabric so that a fastener element of the fastener stringer is positioned inside an end section of the lower side fabric, and a portion of the sewing thread positioned over the fastener tape is in contact with the upper surface of the fastener tape.