Linking Machine Vision Guidance for Stitch Accuracy
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Solution Overview
Problem
Current linking machines are slow, expensive, inflexible, and require skilled operators, leading to excessive eyestrain and reduced productivity due to limitations in motor control, fabric handling, and stitch accuracy.
Innovation Solution
A linking machine with a vision system using a phosphorescent guide thread and real-time feedback motors to autonomously identify and adjust stitching positions, allowing for variable pitch control and high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manual linking is used, then stitch accuracy is maintained, but productivity is low and operator eyestrain increases
Solution Approach 1:
The patent replaces the manual mechanical stitching system with an automated robotic system equipped with vision guidance. The robot arm with needle assembly automates the stitching motion, while the vision system (camera and processor) replaces human visual inspection and positioning. This substitution eliminates operator eyestrain while maintaining high stitch accuracy through automated image processing and real-time position adjustment.
Solution Approach 2:
The vision system enables the machine to autonomously identify stitch positions and adjust its own movement parameters. The processor analyzes images to detect stitch locations and automatically calculates the required needle positions, allowing the system to self-correct without human intervention. This self-service capability eliminates the need for skilled operators while maintaining high precision.
2Manufacturing precision
If fixed-pitch motor control is used, then device simplicity is maintained, but stitching accuracy deteriorates due to fabric tension variations
Solution Approach 1:
The patent implements a closed-loop feedback system where the vision system continuously monitors stitch positions and fabric characteristics. The processor uses this visual feedback to dynamically adjust motor commands, compensating for fabric tension variations and positioning errors. This feedback mechanism maintains high stitching accuracy despite variations in fabric properties and tension during the stitching process.
Solution Approach 2:
The motor control system transitions from fixed-pitch to dynamic variable-pitch control. The robot controller adjusts movement parameters in real-time based on vision system data, allowing the pitch between stitches to vary according to actual fabric conditions. This dynamic adaptation enables accurate stitching despite fabric tension changes while maintaining manageable system complexity through software-based control.
3Productivity
If high-speed operation is implemented, then productivity increases, but stitch accuracy decreases due to motor limitations
Solution Approach 1:
The real-time vision feedback system allows the controller to continuously monitor and correct needle position errors that occur during high-speed operation. Even when the robot moves quickly, the vision system detects actual stitch locations and the processor compensates for positioning deviations, maintaining accuracy despite high speeds. This feedback loop enables the system to operate at high velocity without sacrificing precision.
Solution Approach 2:
The vision system captures images and processes stitch position data in advance of the needle reaching each stitch location. The processor pre-calculates the required motor adjustments and sends commands to the robot controller before the stitching action occurs. This preliminary processing allows the system to maintain high speeds while ensuring accurate stitch placement through proactive position correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The machine significantly increases productivity, reduces operator strain, and improves stitch accuracy, enabling untrained operators to use it with ease and achieving speeds exceeding 700 stitches per minute.
Implementation Method 1
A linking machine with a vision system using a phosphorescent guide thread and real-time feedback motors
Data Source
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AI summary
A looping machine (4) comprising a feed device (16) of the fabric (12) along a longitudinal direction (Y-Y), a positioning device (20) of a needle (10) along a transverse direction (X-X), an operating device (24) of said needle (10) along a vertical direction (Z-Z), perpendicular to said longitudinal (Y-Y) and transverse (X-X) directions, to perform the looping, characterized in that it comprises a camera (103) suitable for identifying a guide thread (40) arranged at at least one fabric (12) to be stitched, said guide thread (40) being inserted inside the fabric (12) so as to identify a plurality of segments (blob) (44). The machine (4) comprises a processing and control unit (56), operatively connected to the camera (103) and to actuators of the feed device (16) of the fabric (12), of the positioning device (20) of the needle (10) and of the actuation device (24) of the needle (10), so as to determine in real time the target stitching position of the needle (10) as a function of the guide thread (40) and to control in real time said devices (16, 20, 24) for reaching said target stitching position of the needle (10).