Loom Cloth Winding Torque Control via Speed Variation Detection
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Solution Overview
Problem
Existing cloth winding apparatuses in looms require a load cell to detect torque, making the system complex and large in size, which complicates the control of winding tension and diameter.
Innovation Solution
A method and apparatus that use a take-up motor with a controller to set a change command torque, detect rotation speed variations, calculate load torque, and adjust winding torque based on tension and diameter, eliminating the need for a load cell by using a rotation speed detector and progressive torque commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a load cell is used to detect torque for controlling cloth winding, then torque detection accuracy is improved, but the apparatus becomes complicated in structure and large in size
Solution Approach 1:
The invention extracts and eliminates the load cell from the system by using an alternative approach: detecting rotation speed variations of the take-up motor and calculating load torque from these variations. This removes the complex mechanical sensing component while maintaining torque measurement capability through computational methods.
Solution Approach 2:
The invention replaces the mechanical load cell-based torque detection system with an electrical/control system that uses rotation speed sensors and computational algorithms. The load torque is calculated based on the relationship between commanded torque and actual rotation speed variations, substituting mechanical sensing with electronic measurement and calculation.
2Measurement precision
If a load cell is used to detect torque for controlling cloth winding, then torque detection accuracy is improved, but the apparatus becomes large in size
Solution Approach 1:
The load cell is extracted and removed from the apparatus, eliminating the need for bulky mechanical sensing components. The torque detection function is transferred to the control system through rotation speed measurement and calculation, significantly reducing the physical space required for torque sensing.
Solution Approach 2:
The mechanical load cell system is replaced with an electronic measurement system using rotation speed detectors and computational methods. This substitution dramatically reduces the apparatus size by eliminating heavy mechanical components while maintaining accurate torque detection through software-based calculation.
3Measurement precision
If the entirety of the independent motor and reduction gear unit is movable supported for load cell detection, then torque detection is enabled, but the apparatus becomes complicated in structure
Solution Approach 1:
The invention extracts the load cell requirement entirely from the motor-gear system configuration. Instead of making the motor and gear unit movable to accommodate a load cell, the system uses a stationary configuration with rotation speed detection, eliminating the need for complex movable support structures.
Solution Approach 2:
The mechanical arrangement of movable motor and gear units for load cell integration is replaced with a stationary configuration using electrical rotation speed sensing. The load torque is calculated from rotation speed data without requiring any mechanical movement or reconfiguration of the motor-gear assembly.
4Manufacturing precision
If progressive change command torque is used to control take-up motor, then winding control accuracy is improved, but the control system becomes more complex
Solution Approach 1:
The control system dynamically adjusts the command torque in progressive steps based on the detected rotation speed variations. This dynamic adjustment allows accurate compensation for load changes during winding while maintaining a relatively simple control structure through adaptive rather than pre-programmed complexity.
Solution Approach 2:
The control system uses feedback from rotation speed detection to calculate load torque and adjust command torque progressively. This feedback mechanism achieves high winding control accuracy by continuously adapting to actual load conditions, with the complexity managed through automated feedback loops rather than manual system design.
Data Source
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AI summary
There is provided a method for controlling winding of a woven cloth (8) in a loom, wherein the cloth 88) delivered through a surface roller (2) is wound on a cloth roller (9) driven by a take-up motor (16) whose torque is controllable. The method includes the steps of setting a change command torque (21) that progressively increases or decreases a torque of the take-up motor (16), driving the take-up motor according to the change command torque (21) after setting the change command torque, detecting variation of rotation speed of the take-up motor (16), calculating load torque based on the change command torque (21), calculating winding torque based on tension and winding diameter of the cloth (8), calculating winding control torque by adding the load torque and the winding torque, and driving the take-up motor (16) according to the winding control torque. There is also provided an apparatus for winding of a woven cloth in a loom by the above-described method.