Sewing Machine Dual-Side Stitching Pattern Image Acquisition
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Solution Overview
Problem
Existing sewing machines face challenges in accurately judging the thread tension balance between upper and lower threads, especially considering the type and material of the cloth being sewn, which affects sewing quality.
Innovation Solution
A sewing machine equipped with first and second image acquisition units for capturing stitching patterns from the front and back sides of the cloth, with a display unit showing these images side-by-side or superimposed, allowing users to visually assess and adjust the thread tension balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If image acquisition is performed from only one side of the cloth, then the device complexity is reduced, but the measurement precision of thread tension balance deteriorates
Solution Approach 1:
The image acquisition function is segmented into two separate image acquisition units positioned at different locations (front side and back side of the cloth), allowing independent capture of stitching patterns from both sides simultaneously
Solution Approach 2:
The stitching pattern images captured from both sides serve as intermediary visual data that enables indirect observation and comparison of thread tension balance without directly measuring physical thread tension forces
2Ease of operation
If thread tension balance is adjusted manually using a thread tension balancing device, then the ease of operation is improved, but the manufacturing precision of stitching pattern deteriorates
Solution Approach 1:
The system establishes a feedback loop where stitching pattern images are captured, compared against reference images, and the results guide thread tension balance adjustments, enabling continuous optimization of stitching quality
Solution Approach 2:
The manual mechanical adjustment of thread tension is replaced with an automated image-based assessment system that objectively determines optimal tension settings through visual pattern recognition and comparison
3Measurement precision
If the area of thread region is calculated to estimate thread tension balance, then the measurement precision is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
Instead of directly measuring physical thread properties, the system creates visual copies (images) of the stitching patterns from both sides of the cloth, which can be easily analyzed through image processing to extract thread region area information
Solution Approach 2:
The stitching pattern images serve as an intermediary representation that translates complex physical thread tension measurements into easily analyzable visual data, where thread region area can be calculated through standard image processing techniques
Data Source
AI summary
A sewing machine includes a first image acquisition unit, a second image acquisition unit, and a display unit. In the sewing machine, the first image acquisition performs image acquisition from the front face side of a cloth for a stitching pattern formed in the cloth. The second image acquisition unit performs image acquisition from the back face side of the cloth such that the center position of the acquired image matches the center position of the image of the stitching pattern acquired by the first image acquisition unit. The display unit displays, on the same screen, a first stitching pattern video image thus acquired by the first image acquisition unit and a second stitching pattern video image thus acquired by the second image acquisition unit.