Seam Profile Position Control Using Material Structure Comparison
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Solution Overview
Problem
Existing sewing technologies fail to achieve high accuracy in reproducibly positioning a seam course relative to structures on sewing materials, particularly with materials like leather that have inhomogeneous properties and complex patterns.
Innovation Solution
A method that adapts a sewing program by comparing reference structure data from a reference material to working structure data from the actual material being sewn, using a camera system to detect and adjust for deviations in position, size, and orientation, ensuring precise alignment and positioning of the seam course.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sewing devices with basic camera detection are used, then the device complexity is low, but the manufacturing precision of seam position relative to material structure is insufficient
Solution Approach 1:
The patent applies preliminary action by detecting and recording reference positions of material structures before sewing, generating reference structure data sets in advance. This allows the sewing program to be pre-adjusted based on detected deviations, ensuring high precision seam positioning without requiring complex real-time control systems during the actual sewing process.
Solution Approach 2:
The patent uses copying by creating digital representations (structure data sets) of the physical material structures. Reference structure data sets are generated from detected reference positions, and working structure data sets are created from detected working positions. These digital copies enable comparison and adjustment without directly manipulating the physical material, reducing device complexity while maintaining high precision.
2Manufacturing precision
If real-time adjustment of sewing program is implemented, then the manufacturing precision is improved, but the productivity decreases due to additional processing time
Solution Approach 1:
The system performs detection and adjustment operations before the actual sewing process. Reference positions are detected and reference structure data sets are generated in advance, allowing the sewing program to be prepared with appropriate adjustments before production begins, thus maintaining high speed during actual sewing.
Solution Approach 2:
The patent implements feedback by comparing working structure data sets with reference structure data sets and using the detected deviations to adjust the sewing program. This closed-loop feedback ensures high precision while the adjustment process is efficiently integrated into the workflow, minimizing impact on overall productivity.
3Manufacturing precision
If detailed detection of material structures is performed, then the manufacturing precision is improved, but the measurement precision requirements increase
Solution Approach 1:
The patent introduces an intermediary approach by using detected structure positions as reference points rather than requiring direct measurement of all material properties. The camera system detects key structural features (holes, patterns), and these detections serve as intermediaries to guide seam positioning, reducing the overall measurement precision requirements while maintaining high seam position precision.
Solution Approach 2:
By creating digital copies (structure data sets) of the material structures, the system enables repeated analysis and comparison without requiring repeated high-precision measurements of the physical material. The digital representations can be processed multiple times with standard precision, achieving high manufacturing precision through computational rather than purely measurement-based approaches.
Data Source
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AI summary
The present invention relates to a method for controlling the position of a seam profile and to a device for carrying out the method, wherein the position control of a seam profile relative to structures of a sewing material is based on comparison data of a structure of a reference sewing material and a structure of a working sewing material.