Sewing Machine Movable Holding Member for Elastic Workpiece Stitching
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Solution Overview
Problem
Existing sewing machines face challenges in accurately positioning stitches on elastic workpieces, such as vehicle seat materials, due to surface displacement caused by initial stitching, which affects the precision of subsequent stitches.
Innovation Solution
A sewing machine equipped with a movable holding member, an imaging device, and an illumination system that captures and adjusts the workpiece's surface patterns within an imaging region, allowing for improved detection and alignment of displacement, using sewing data to control the actuator and illumination based on the workpiece's color and surface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the surface of the workpiece is captured to detect displacement, then the detection capability is provided, but the detection accuracy is insufficient due to improper positioning and illumination
Solution Approach 1:
The system performs preliminary positioning of the workpiece surface into the imaging region before capture, and pre-adjusts illumination conditions based on workpiece color detection. This preliminary preparation ensures that when imaging occurs, the surface is properly positioned and lit, maximizing detection accuracy without requiring repeated attempts.
Solution Approach 2:
The system captures images of the workpiece surface, detects the actual position and color, compares this with target positions, and uses this feedback information to adjust subsequent imaging and illumination parameters. This closed-loop feedback mechanism continuously improves detection accuracy by learning from previous capture results.
2Adaptability or versatility
If multiple stitches are formed on elastic workpiece, then the design requirements are met, but surface displacement occurs reducing subsequent stitch precision
Solution Approach 1:
After each stitch is formed, the system captures an image of the workpiece surface to detect actual displacement caused by the stitching process. This displacement information is fed back to update the target position for the next stitch, allowing the system to compensate for elastic deformation and maintain high positioning accuracy throughout the multi-stitch process.
Solution Approach 2:
Before forming each subsequent stitch, the system performs preliminary detection of the workpiece surface position and calculates the corrected target position based on previous displacement patterns. This preliminary adjustment ensures that each stitch is positioned accurately despite cumulative elastic deformation.
3Measurement precision
If the imaging device captures the workpiece surface, then displacement detection is enabled, but image quality deteriorates due to inadequate illumination adjustment
Solution Approach 1:
The system dynamically adjusts illumination parameters (light intensity, angle, duration) based on detected workpiece color and surface characteristics. By changing illumination parameters to match the specific workpiece being processed, the system optimizes image capture quality for displacement detection without using excessive light that could damage or heat the material.
Data Source
AI summary
A sewing machine is disclosed. The sewing machine includes a holding member configured to be movable while holding a workpiece within a predetermined plane including a sewing position immediately below a needle, an actuator configured to move the holding member, an imaging device configured to be capable of capturing the workpiece, a sewing data acquisition unit configured to acquire sewing data including a sewing order to be referred to in sewing processing, and an imaging position setting unit configured to output a control signal to the actuator so that a plurality of feature patterns of the workpiece are sequentially disposed in an imaging region of the imaging device based upon the sewing data.