Yarn Storage Feed Device Optical Sensor Light Barrier
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Solution Overview
Problem
Existing yarn feed devices lack precision in measuring yarn quantity on a drum due to limitations in optical reflection methods, which are influenced by yarn color and dirt, and mechanical solutions alter yarn tension, leading to inaccurate counting and resolution issues.
Innovation Solution
A feed device with an optical sensor system using multiple transmitters and receivers arranged as light barriers around a rotating drum, coupled with a control unit that analyzes light beam interruptions to count turns with absolute precision, ensuring accurate yarn stock monitoring and tension control without affecting yarn passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical reflection methods are used to measure yarn quantity, then the measurement can be performed non-contactedly, but the measurement precision deteriorates due to influence by yarn color and dirt
Solution Approach 1:
The patent replaces optical reflection methods with a light barrier interruption system. Instead of using reflectors that are sensitive to yarn color and surface conditions, the invention uses transmitters and receivers that detect yarn presence through light blockage. This substitution eliminates the dependency on optical reflection properties, thereby resolving the contradiction between non-contact measurement capability and measurement precision affected by yarn color and dirt.
Solution Approach 2:
The patent introduces an intermediary detection mechanism where light barriers serve as mediators between the yarn and the measurement system. Rather than directly measuring yarn properties optically, the system uses light interruption events as intermediaries to infer yarn quantity, eliminating the direct influence of yarn color and surface contamination on measurement accuracy.
2Measurement precision
If mechanical lever detectors are used to measure yarn quantity, then the measurement can be performed with physical contact, but the yarn tension is modified affecting the yarn feed
Solution Approach 1:
The patent substitutes mechanical lever detectors with an optical light barrier system. This replacement eliminates physical contact between the measurement device and the yarn, thereby preventing modification of yarn tension while maintaining the ability to measure yarn quantity through non-contact light interruption detection.
3Device complexity
If a single emitter/receiver member is used for barrier operation, then the device structure is simplified, but the resolution and precision of yarn position measurement deteriorates
Solution Approach 1:
The patent segments the single emitter/receiver member into multiple separate transmitter and receiver elements arranged around the drum. This segmentation allows independent optimization of each detection element and enables multiple measurement zones, thereby improving yarn position resolution and precision while maintaining relatively simple individual component structures.
Solution Approach 2:
The patent transitions from a single-point detection approach to a distributed multi-point detection arrangement around the drum circumference. This dimensional expansion from one measurement location to multiple locations around the drum enables simultaneous measurement of yarn position at different angles, significantly improving resolution and precision without proportionally increasing device complexity.
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 device achieves precise measurement of yarn quantity on the drum and yarn absorbed by the textile machine, maintaining optimal yarn tension and resolution, unaffected by yarn color or dirt, with real-time monitoring and precise counting of turns.
Implementation Method 1
A feed device with an optical sensor system using multiple transmitters and receivers arranged as light barriers around a rotating drum, coupled with a control unit that analyzes light beam interruptions to count turns with absolute precision
Data Source
AI summary
A storage feed device for a yarn which unwinds from a corresponding bobbin and is fed to a textile machine. The device includes a rotary or fixed drum and an optical sensor member arranged to sense the movement of the yarn towards the textile machine. The optical sensor includes a plurality of emitters and receivers between which a light beam is generated and is interrupted by the yarn during its movement. The optical sensor includes a first fixed part and a second fixed part which includes the emitter and receiver elements, the first part being coaxial with the rotary member, the second being annular and surrounding the first part, the yarn moving between the parts.