Textile Machine Yarn Catcher Standby Position Control
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Solution Overview
Problem
Textile machines face challenges in accurately aligning driven members, such as yarn catching members, due to the need for high mounting accuracy, which is time-consuming and requires technical skill, and results in potential collisions or failure to catch yarn ends.
Innovation Solution
A textile machine configuration that includes a driven member, a driving section, an origin sensor, a command value measuring section, and a drive control section to determine a standby position by counting pulses from a target to an origin position, allowing for accurate movement of driven members without relying on high mounting accuracy, using a stepping motor and magnet sensor for precise position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high mounting accuracy is used to position driven members, then positioning accuracy is improved, but assembly time increases and operator skill requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-defining the origin position of the driven member before actual operation. The origin sensor detects this pre-established origin position, allowing the control device to calculate accurate movement commands without requiring high mounting precision during assembly. This preliminary setup enables subsequent operations to proceed with standard mounting accuracy while maintaining positioning precision.
Solution Approach 2:
The patent replaces the mechanical alignment system with an electronic control system. Instead of relying on mechanical jigs and skilled operators to achieve precise mounting positions, the system uses an origin sensor to detect the origin position and a control device to calculate movement commands based on this detected position. This substitution of mechanical precision requirements with electronic detection and calculation resolves the contradiction between positioning accuracy and assembly complexity.
2Manufacturing precision
If high mounting accuracy is used to position driven members, then positioning accuracy is improved, but operator skill requirements and complexity increase
Solution Approach 1:
The patent replaces complex mechanical alignment procedures with a simplified electronic detection and calculation system. The origin sensor automatically detects the origin position, and the control device automatically calculates the movement commands, eliminating the need for complex mechanical jigs and skilled manual alignment operations. This reduces assembly complexity while maintaining positioning accuracy.
Solution Approach 2:
The system applies self-service by enabling the driven member to self-position through electronic control based on detected origin position. Instead of requiring external mechanical jigs and skilled operators to manually align components, the system uses the origin sensor to detect the origin position and the control device to automatically calculate and execute the positioning, allowing standard assembly procedures to achieve accurate positioning.
3Device complexity
If theoretical command values are used for movement, then device simplicity is maintained, but positioning accuracy deteriorates due to mounting errors
Solution Approach 1:
The patent introduces feedback by using the origin sensor to detect the actual origin position of the driven member and feeding this information back to the control device. The control device then calculates movement commands based on this detected origin position rather than using only pre-programmed theoretical values. This feedback mechanism allows the system to adapt to actual mounting conditions while maintaining device simplicity, resolving the contradiction between simplicity and positioning accuracy.
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 configuration enables easy assembly and accurate positioning of driven members, reducing operator load and preventing collisions, while ensuring reliable yarn end catching and efficient yarn winding operations.
Implementation Method 1
an origin sensor adapted to detect an origin position, which is a reference position, of the driven member
Implementation Method 2
using a stepping motor and magnet sensor for precise position control
Data Source
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AI summary
A stepping motor moves an upper-yarn catching member (30) by an amount corresponding to a specified number of pulses. A magnet sensor detects an origin position, which is a reference position, of the upper-yarn catching member (30). A number-of-pulse counting section obtains an actual measurement value, which is the number of pulses necessary for moving the upper-yarn catching member (30) from a target position to the origin position. A drive control section determines a standby position of the upper-yarn catching member (30) in view of the actual measurement number counted by the number-of-pulse counting section, a theoretical value, and the origin position.