Yarn Supply System Displacement Detection
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Solution Overview
Problem
Existing yarn supplying systems face challenges in maintaining consistent tensile force during yarn supply, often resulting in yarn slack or breakage due to inadequate positioning and movement detection of the pull-in piece, particularly with high-cost and bulky magneto-strictive linear sensors, and discontinuous measurement with proximity sensors.
Innovation Solution
A yarn supplying system incorporating a pull-in piece connected to a filament with an elastic body and a displacement detector, allowing continuous measurement of the filament's displacement to control yarn supply, maintaining balanced tensile force and storage levels, and featuring a detection sensor to reset the origin position, ensuring stable yarn supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magneto-strictive linear sensor is used to measure the position of the pull-in piece, then continuous measurement is achieved, but the configuration becomes extensive and cost increases
Solution Approach 1:
The patent replaces the magneto-strictive linear sensor (electromagnetic measurement system) with a mechanical displacement detector that directly measures the displacement of the pull-in piece. This mechanical substitution simplifies the sensor configuration, reduces cost, and eliminates the need for complex magnetic field interactions while maintaining continuous measurement capability throughout the pull-in direction.
Solution Approach 2:
The patent uses a simplified mechanical detection system that copies the essential measurement function of the complex magneto-strictive sensor. Instead of measuring position indirectly through magnetic field changes, the system directly detects the mechanical displacement of the pull-in piece, creating a simpler copy of the measurement function that achieves the same continuous monitoring goal.
2Measurement precision
If magneto-strictive linear sensor is used to measure the position of the pull-in piece, then continuous measurement is achieved, but the cost increases
Solution Approach 1:
The patent employs a cost-effective mechanical displacement detector instead of expensive magneto-strictive sensors. The mechanical detection system uses simpler, more affordable components that can be manufactured at lower cost while providing the required continuous measurement function, making the overall yarn supplying system more economically viable.
3Device complexity
If proximity sensors are used to measure the position of the pull-in piece, then the system is simple, but the position can only be discontinuously grasped
Solution Approach 1:
The patent replaces the discontinuous optical proximity sensing system with a continuous mechanical displacement detection system. The mechanical detector directly contacts or follows the pull-in piece throughout its movement range, providing continuous position information rather than discrete measurements at specific sensor locations, thus resolving the contradiction between system simplicity and measurement continuity.
4Measurement precision
If the pull-in piece mass is increased by adding magnet, then the magneto-strictive linear sensor can measure position, but the movement of the pull-in piece becomes delayed
Solution Approach 1:
The patent extracts and removes the magnet from the pull-in piece, eliminating the source of the mass increase. Instead of using magnetic measurement methods that require the pull-in piece to be magnetized, the system employs a mechanical displacement detector that measures position without requiring any magnetic components on the moving pull-in piece, thus maintaining fast response speed while achieving continuous measurement.
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
The system ensures continuous and accurate measurement of yarn supply, maintaining appropriate tensile force and storage levels, reducing yarn breakage and slack, and enhancing the quality of knitted or woven fabrics by adjusting yarn supply based on real-time fluctuations.
Implementation Method 1
an elastic body 40, which is a member that is connected to the filament 30 at a predetermined position on the other end side
Implementation Method 2
a displacement detector 50, which is a member that detects the displacement of the filament 30 from an origin position determined in advance
Data Source
Figure 1(A)~1(B)
Figure 2
AI summary
There is provided a yarn supplying system capable of maintaining the tensile force of the yarn in a yarn supply path in an appropriate range, and supplying the yarn from the bobbin without slackening of the yarn with a simple configuration. The yarn supplying system includes a yarn storing device (2) and a control means (1C). The yarn storing device (2) includes a storing unit (10) that stores a yarn (3Y) reeled out from a bobbin (3) in the middle of a yarn supply path, a pull-in piece (20), a filament (30), an elastic body (40), and a displacement detector (50). The pull-in piece (20) pulls in the yarn (3Y) toward the storing unit (10) and linearly reciprocates along a pull-in direction. The filament (30) is connected to the pull-in piece (20) and includes a turn back portion (30t) at the middle, and reciprocates by interlocking with the reciprocate movement of the pull-in piece (20) without substantially stretching or contracting. The elastic body (40) is connected to the filament (30). The displacement detector (50) detects displacement of the filament (30) from an origin position. The control means (1C) controls a supply amount of the yarn (3Y) from the bobbin (3) based on the displacement of the filament (30) from the origin position.