Dynamic Knitting Thread Feeding Tension Control
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Solution Overview
Problem
Automated knitting machines face limitations when working with exotic threads that can break under tension, leading to time delays and inefficiencies due to unpredictable thread drawing speeds and lack of consideration for thread types in programming.
Innovation Solution
A dynamic thread feeding mechanism that includes a spool, motor, mobile guide, sensor, and controller to measure and adjust thread tension, ensuring it does not exceed a threshold by changing the motor speed based on tension changes, thus preventing thread breaks and tangling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the knitting machine operates at normal speed, then productivity is improved, but thread tension exceeds the threshold causing thread breaks
Solution Approach 1:
The patent applies dynamics by making the spool rotation speed variable rather than constant. The motor controlling the spool adjusts its rotation speed dynamically based on real-time thread tension feedback from the sensor, allowing the system to adapt to changing knitting conditions and maintain thread integrity while maximizing productivity.
Solution Approach 2:
The patent implements feedback control by using a sensor to continuously monitor thread tension and feed this information back to the control system. The controller processes the tension signal and adjusts the motor speed accordingly, creating a closed-loop control system that prevents thread breaks while maintaining optimal knitting speed.
2Reliability
If the knitting machine operates slowly to prevent thread breaks, then thread integrity is improved, but productivity decreases
Solution Approach 1:
The feedback control system allows the machine to operate at high speeds normally, only reducing speed when the sensor detects tension approaching the break threshold. This selective speed adjustment maintains productivity while preventing thread breaks, avoiding the need to operate slowly throughout the entire knitting process.
Solution Approach 2:
The system dynamically changes the operational parameter (spool rotation speed) based on real-time conditions. By adjusting the motor speed parameter in response to tension variations, the system achieves both high productivity and thread integrity, rather than being constrained to a fixed low speed.
3Device complexity
If a fixed spool rotation speed is used, then device complexity is reduced, but the system cannot adapt to varying thread drawing speeds causing tension fluctuations
Solution Approach 1:
The feedback mechanism adds minimal complexity by introducing only a sensor and control logic, while dramatically improving adaptability. The system automatically adjusts spool speed in response to thread drawing variations, eliminating tension fluctuations without requiring complex mechanical adjustments or multiple components.
4Device complexity
If no tension monitoring is implemented, then device complexity is reduced, but thread breaks occur due to excessive tension
Solution Approach 1:
The patent replaces complex mechanical tension control mechanisms with an electronic sensing and control system. The sensor electronically detects tension levels, and the motor controller electronically adjusts spool speed, substituting mechanical complexity with more precise and reliable electronic control while maintaining thread integrity.
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 solution effectively controls thread tension, preventing breaks and tangling, and accounts for hysteresis, ensuring continuous operation and reducing downtime, even with varying and unpredictable thread drawing speeds.
Implementation Method 1
a mobile guide in the thread path that changes position due to changes in thread tension as the knitting device draws thread through the mobile guide
Implementation Method 2
a sensor that measures a change in position of the mobile guide
Data Source
AI summary
Systems and methods are provided for feeding thread at a knitting machine. One embodiment is a thread feeding device which includes a spool that supplies thread to a knitting device through a thread path and a motor that drives the spool. The device and further includes a mobile guide in the thread path that changes position due to changes in thread tension as the knitting device draws thread through the mobile guide. The thread feeding device also includes a sensor that measures a change in position of the mobile guide, and a controller that determines an amount of tension applied to the thread by the knitting device based on the change in position, and adjusts a speed of a motor that drives the spool based on the amount of tension.