Textile Machine Sliver Thickness Measurement Correction
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Solution Overview
Problem
Textile machine sensors experience significant measurement errors during startup after a prolonged standstill due to temperature-related issues, as they cool down and warm up unevenly, leading to inaccurate sliver thickness measurements.
Innovation Solution
The method corrects sliver thickness parameters by using the deviation from a pre-stall reference value, with the actual measurement error after standstill serving as the basis for correction, and gradually reducing corrections as the machine heats up, ensuring accurate measurements by accounting for temperature fluctuations and assembly tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are used to correct measurement values, then measurement precision is improved, but reliability is worsened because temperature can only be measured at individual points and local fluctuations are not taken into account
Solution Approach 1:
The patent replaces the mechanical temperature sensor-based correction system with a computational correction system. Instead of using physical temperature sensors to measure and correct measurements, the invention uses a control unit that calculates correction values based on operating parameters (speed, tension, temperature) and stores them in a correction curve. This substitution of mechanical measurement with computational correction resolves the contradiction by eliminating the need for physical temperature sensors while improving both precision and reliability.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing correction values in a correction curve before actual measurement and correction are needed. The control unit determines correction values based on expected operating conditions and stores them in advance, so that when measurements are taken, the appropriate correction can be immediately applied without real-time temperature sensing. This preliminary preparation ensures both precision and reliability.
2Measurement precision
If correction curves are calculated in advance, then measurement precision is improved, but adaptability is worsened because different materials and machines require different correction curves
Solution Approach 1:
The patent applies dynamics by making the correction system adaptable and flexible rather than static. The control unit can determine correction values for different operating conditions and store multiple correction curves or dynamically select appropriate corrections. This allows the system to adapt to different materials and machines while maintaining precision, as the correction can be adjusted based on the specific operating context.
Solution Approach 2:
The patent uses parameter changes to achieve adaptability. Instead of creating separate correction curves for every material and machine combination, the system varies correction parameters based on operating conditions such as speed, tension, and temperature. By changing these parameters dynamically, the system maintains measurement precision across different materials and machines without requiring entirely separate correction curves for each.
3Measurement precision
If multiple temperature sensors are installed to capture local fluctuations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical system of multiple temperature sensors with a computational approach. Instead of installing multiple physical sensors to measure local temperature fluctuations, the control unit calculates correction values based on operating parameters and uses these to correct measurements. This substitution eliminates the need for multiple temperature sensors while maintaining measurement precision, thereby reducing device complexity.
Data Source
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AI summary
The method involves determining the parameter while stretching the sliver (2) continuously or at intervals. The parameter depends on the thickness of the band of the sliver. The amount of parameters determined after an idle state of the textile machine are corrected by a reference value depending on the deviation of the parameters determined after the idle state, where the reference value is defined before the idle state. The reference value corresponds the last value of the parameter or the mean value of a defined number of amounts of the parameter. An independent claim is included for a textile machine with a device for stretching a sliver.