Retractable Zipper With Y-Shaped Tape for Hidden Stitching
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Solution Overview
Problem
Existing zippers with visible stitching lines deflect during mechanical stitching, affecting aesthetics and production efficiency.
Innovation Solution
A retractable zipper with a Y-shaped tape design, featuring upper and lower tapes with a stitching gap, allowing the upper tape to cover the stitching line post-stitching, and incorporating retractable zipper structures for adjustable width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the zipper and case shell are stitched together through mechanical equipment, then the production efficiency is improved, but the stitching line deflects and affects the aesthetics
Solution Approach 1:
The patent introduces a Y-shaped tape structure as an intermediary element between the zipper and the case shell. The lower tape provides the stitching surface for mechanical equipment, while the upper tape covers the stitching line. This mediator allows mechanical stitching to proceed efficiently while hiding the imprecise stitching line from view, thus resolving the contradiction between production efficiency and stitching accuracy.
Solution Approach 2:
The tape is segmented into two distinct functional parts: the lower tape that interfaces with the stitching machine and case shell, and the upper tape that conceals the stitching line. This segmentation allows each part to perform its specific function optimally - the lower tape enables efficient mechanical stitching while the upper tape restores aesthetics by covering the deflecting stitching line.
2Manufacturing precision
If the upper tape is folded to cover the stitching line, then the aesthetics is improved, but the stitching operation becomes difficult
Solution Approach 1:
The Y-shaped tape structure is designed to be dynamic rather than static. During stitching, the upper tape is folded back to provide clear access to the stitching area, making the operation easy. After stitching is complete, the upper tape is returned to its covering position to hide the stitching line. This dynamic adjustment resolves the contradiction between aesthetics and ease of operation.
3Ease of operation
If the stitching line is exposed, then the stitching operation is easy, but the product aesthetics is affected
Solution Approach 1:
The upper tape serves as a mediator that can be temporarily moved aside during stitching to allow easy operation, then returned to cover the stitching line to maintain aesthetics. This intermediary element allows both requirements to be satisfied at different stages of the process.
4Ease of manufacture
If the zipper width is fixed, then the manufacturing is simple, but the adaptability to different luggage specifications is reduced
Solution Approach 1:
The zipper incorporates a retractable tooth chain mechanism that allows the zipper width to be dynamically adjusted. The tooth chain can be extended or retracted based on the specific luggage dimensions, while the Y-shaped tape structure remains integrated and provides consistent aesthetic coverage. This dynamic adjustability resolves the contradiction between manufacturing simplicity and adaptability.
Data Source
AI summary
The utility model relates to the technical field of zippers, and particularly to a retractable zipper with a Y-shaped tape. The aesthetics of an existing zipper is affected after a stitching line is deflected. A retractable zipper with a Y-shaped tape comprises a main body, wherein the main body comprises a first tape, a second tape and a third tape; a first zipper structure and a second zipper structure are arranged between the first tape and the second tape and between the third tape and the second tape, respectively; sides of the first tape and the third tape away from the second tape are provided with a Y-shaped tape structure, respectively; each Y-shaped tape structure comprises an upper tape and a lower tape, and a stitching gap is formed between the upper tape and the lower tape. The upper tape is turned over, the lower tape is pierced by a needle to stitch and fix the zipper and the case shell together, and when stitching is completed, the upper tape is put back to cover a stitching line, so that the aesthetics of a product will not be affected even if the stitching line is deflected. The utility model has a good development prospect.