Flat Knitting Machine Tension Device Setup Automation
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Solution Overview
Problem
Setting tension for a large number of top tension devices in flat knitting machines is troublesome due to variations in yarn species, temperature, humidity, and production lot, requiring manual adjustments that can disrupt fabric quality.
Innovation Solution
Implementing a system where the torque for top tension devices is automatically adjusted based on yarn feeding routes, using tension sensors and a dedicated measuring device to measure and correct input values for each yarn feeding speed, allowing for precise tension control without halting the knitting machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual tension setting is performed for each top tension device, then tension can be adjusted for different yarn species, but the setup process becomes time-consuming and troublesome
Solution Approach 1:
The system automatically measures yarn tension characteristics and adjusts top tension device settings without requiring manual intervention. The yarn itself provides the measurement data through the tension sensor, and the controller automatically processes this information to set appropriate tension values for each device.
Solution Approach 2:
The system changes the tension parameter automatically based on measured yarn characteristics. By measuring the actual tension required for different yarn species and automatically adjusting the top tension device parameters, the system adapts to various yarn types without manual reconfiguration.
2Ease of operation
If constant torque is applied to top tension devices, then device operation is simplified, but tension varies with different yarn characteristics
Solution Approach 1:
The system uses tension sensors to continuously monitor yarn tension and feeds this information back to the controller. The controller then adjusts the top tension device torque based on the measured tension, creating a closed-loop control system that maintains consistent tension despite variations in yarn characteristics.
Solution Approach 2:
The system transitions from static constant torque settings to dynamic torque adjustment. The top tension device torque is continuously adapted based on real-time yarn tension measurements, allowing the system to respond to changing yarn characteristics while maintaining operational simplicity.
3Reliability
If top tension devices are equipped for each yarn feeding route, then yarn tension control is possible, but the number of devices and setup complexity increases
Solution Approach 1:
The system uses identical top tension devices with identical structures across all yarn feeding routes. Each device is equipped with a tension sensor and controller that enables them to function independently yet consistently. This universal design allows any device to handle any yarn type by automatically measuring and adjusting tension, reducing the need for specialized devices for different routes.
Data Source
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AI summary
A top tension device, provided on a flat knitting machine, having an adjusting member for adjusting tension to a yarn, according to an electrical input, is set. An input value to the adjusting member for applying a desired tension to a yarn is measured. The input value is corrected and transformed to a setup value on the basis of elements in the yarn feeding route from the top tension device to the carrier of the yarn. The controller of the flat knitting machine applies the setup value to the adjusting member.