Perforated Sheet Stitching Without Zig-Zag Seam Distortion
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Solution Overview
Problem
Perforations in materials like leather distort the intended line of stitching during sewing, leading to an unsightly zig-zag pattern due to the sewing machine's preference for entering existing perforations rather than piercing the material.
Innovation Solution
Stitching is performed in unperforated regions adjacent to perforated regions, allowing the stitching to blend in with the perforations and maintain a desired path, creating a more aesthetically pleasing result.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stitching is performed on perforated material, then the material can be joined or decorated, but the stitching path becomes distorted and zig-zags between perforations
Solution Approach 1:
The invention extracts the stitching operation from the perforated region and relocates it to an unperforated region adjacent to the perforated region. This separation eliminates the interference between existing perforations and the stitching needle, allowing the stitching path to follow the intended trajectory without zig-zaging between perforations.
Solution Approach 2:
The unperforated region acts as an intermediary zone between the perforated material and the stitching operation. By performing stitching in this intermediate unperforated area, the invention mediates between the need for stitching and the presence of perforations, allowing both to coexist without mutual interference.
2Manufacturing precision
If stitching is performed in unperforated region, then stitching path accuracy is improved, but the stitching may not blend with existing perforations
Solution Approach 1:
The invention merges the visual elements of stitching and perforations by positioning the stitching in the unperforated region adjacent to the perforated region. The stitching holes created in the unperforated material blend visually with the existing perforations, creating a unified aesthetic appearance while maintaining stitching path accuracy.
Solution Approach 2:
The invention utilizes visual blending by positioning stitching adjacent to perforations, where the stitch holes and existing perforations create a unified visual pattern. The contrasting thread color can be selected to either match or contrast with the material, enhancing the aesthetic effect while the proximity to perforations ensures visual integration.
3Shape
If stitching is performed adjacent to perforated region, then aesthetic appearance is improved, but the stitching location is more constrained
Solution Approach 1:
The invention applies preliminary action by pre-defining unperforated regions adjacent to perforated regions before the stitching operation. These unperforated bands are intentionally left without perforations during the perforation process, creating predetermined zones where stitching can be performed with both aesthetic and functional benefits.
Solution Approach 2:
The invention segments the material into distinct perforated and unperforated regions, with the unperforated regions serving as dedicated zones for stitching operations. This segmentation provides structured flexibility, allowing stitching to be performed in specific locations that optimize both appearance and functionality while maintaining overall design versatility.
Data Source
AI summary
A method of producing a stitched perforated sheet material including providing a sheet material (3) with a perforated region 4 and an unperforated region (5). The sheet material is then stitched in the unperforated region, but adjacent to the perforated region. This gives an overall perforated appearance whilst avoiding the problems associated with stitching through a perforated material.