Yarn Tension Monitoring via Actuator Drive Torque
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Solution Overview
Problem
Existing yarn tension monitoring systems in textile machines lack precision and flexibility, particularly for large numbers of yarns, as they cannot accurately localize tension variations or adjust sensitivity for different yarn types, leading to uneven pile heights in carpets and suboptimal weaving quality.
Innovation Solution
A system utilizing actuators with built-in control and monitoring means that measure drive torque to assess yarn tension, allowing for targeted and individual monitoring of yarns, with the option to adjust sensitivity and provide precise localization of issues, enabling effective tension management across a wide machine width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact strips with rollers are used to monitor yarn tension, then monitoring coverage can be achieved, but the system occupies large space and cannot provide precise localization for individual yarns
Solution Approach 1:
The monitoring system is segmented by assigning individual monitoring means to each actuator and each yarn group, enabling precise localization of tension variations to specific yarns while maintaining a manageable system structure through modular segmentation
Solution Approach 2:
The patent replaces complex mechanical contact strip systems with a control system that monitors actuator parameters (current, voltage, position, speed) to indirectly measure yarn tension, thereby achieving precise monitoring with reduced mechanical complexity
2Measurement precision
If individual yarn monitoring detectors are assigned to each yarn, then precise localization is achieved, but the system takes up large space and is difficult to implement for large numbers of yarns
Solution Approach 1:
The actuator control system serves multiple functions: it not only controls the actuators but also monitors yarn tension by measuring actuator parameters, eliminating the need for separate monitoring detectors and reducing space occupation while maintaining individual yarn monitoring capability
Solution Approach 2:
The actuator parameters (current, voltage, position, speed) serve as intermediary measurements that indirectly reflect yarn tension, allowing the system to monitor individual yarns without requiring physical detectors on each yarn, thus reducing space requirements
3Measurement precision
If monitoring sensitivity is adjusted for different yarn types, then monitoring accuracy improves, but the adjustment process becomes laborious
Solution Approach 1:
The monitoring sensitivity is made dynamic and adjustable through the control system, allowing real-time modification of monitoring parameters for different yarn types without requiring physical reconfiguration, thereby maintaining high accuracy while simplifying the adjustment process
Solution Approach 2:
The system monitors changes in actuator parameters (current, voltage, position, speed) to detect yarn tension variations, and the control system can dynamically adjust monitoring thresholds and sensitivity levels based on yarn type, enabling accurate monitoring while reducing manual adjustment effort through automated parameter adaptation
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
This approach allows for accurate, compact, and adaptable yarn tension monitoring, preventing yarn breaks and ensuring consistent quality by enabling precise detection and adjustment of tension variations, even in high-yarn-density environments.
Implementation Method 1
measuring means for producing measurement signals for each actuator which are a measure of the drive torque of said actuator
Data Source
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Figure 3~4
AI summary
The present invention relates to: a deliver device (1) with actuators (3) for delivering yarns (2) in a textile machine, control means (4) for controlling the actuators (3) which comprise measuring means with measurement signals as a measure of the drive torque of the actuators (3) and monitoring means (5) for monitoring the tension of the yarns (2) using said measurement signals, a method for monitoring the tension of yarns (2) which are delivered in a textile machine by means of actuators (3), comprising producing measurement signals as a measure of the drive torque of the actuators (3) as a measure of the tension, the use of control means (4) for controlling actuators (3) for delivering yarns (2) in a textile machine in order to monitor the tension of the yarns (2).