Stepping Motor Bobbin Alignment via Pulse Counting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Textile machines without sensors for detecting the position of the yarn supplying bobbin face challenges in accurately aligning the bobbin, leading to increased costs and difficulties in handling various bobbin shapes and sizes, as different controls are required for each type.
Innovation Solution
A textile machine configuration that includes a bobbin holding section, drive section, drive control section, origin sensor, and command value measuring section, allowing for accurate alignment of the yarn supplying bobbin without a position detection sensor, using actual measurement command values to move the bobbin holding section to a target position, and storing these values for different bobbin diameters to streamline the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor for detecting the position of the yarn supplying bobbin is used, then the positioning accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses a command value measuring section to obtain the actual measurement command value from the motor's command values, creating a virtual copy of the position information without requiring physical position sensors. This allows the system to determine bobbin position by measuring the motor's movement commands rather than directly sensing the bobbin position, thereby achieving positioning accuracy without adding sensor complexity
Solution Approach 2:
The patent introduces a command value measuring section as an intermediary between the drive control section and the drive section. This intermediary measures the actual measurement command value that represents the difference between origin and target positions, allowing indirect position determination without direct bobbin position sensing, thus resolving the contradiction between measurement precision and device complexity
2Measurement precision
If the bobbin holding section is accurately attached to achieve proper positioning, then the positioning accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces the mechanical positioning approach (requiring accurate attachment of the bobbin holding section) with a control-based approach. The drive control section uses the actual measurement command value to calculate and control the motor's movement, achieving positioning accuracy through software control rather than precise mechanical assembly, thereby reducing manufacturing costs while maintaining positioning precision
3Adaptability or versatility
If different controls are performed for different yarn supplying bobbin types, then the adaptability is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent creates a universal control method that works for all yarn supplying bobbin types. The command value measuring section obtains actual measurement command values that can be stored and reused for different bobbin types, eliminating the need for operators to perform different control procedures for each bobbin type. The system automatically adapts to different bobbins by selecting appropriate stored command values, maintaining both adaptability and ease of operation
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
Enables accurate alignment of the yarn supplying bobbin regardless of its position, reducing costs and simplifying the process by using a stepping motor with pulse counting for position control and a magnet sensor for specifying the origin position, allowing for efficient yarn unwinding and winding across multiple winding units.
Implementation Method 1
an origin sensor adapted to specify an origin position, which is a reference position of the bobbin holding section
Implementation Method 2
a command value measuring section adapted to obtain the command value necessary for moving the bobbin holding section from the origin position to a target position as an actual measurement command value
Implementation Method 3
The drive section is adapted to drive the bobbin holding section
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An automatic winder (1) includes a bobbin holding section (54, 110), a stepping motor (100), a drive control section (71), a magnet sensor (72), and a number-of-pulse counting section (74). The bobbin holding section (54, 110) holds a yarn supplying bobbin (21). The drive control section (71) drives the stepping motor (100) by an amount corresponding to a specified command value (number of pulses) to move the bobbin holding section (54, 110). The magnet sensor (72) specifies an origin position, which is the reference position of the bobbin holding section (54, 110). The number-of-pulse counting section (74) obtains the command value (number of pulses) necessary for moving the bobbin holding section (54, 110) from the origin position to a target position as an actual measurement command value.