Yarn Knot Releasing with Staged Tension in Narrow Threading Spaces
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Solution Overview
Problem
Existing yarn package knot releasing devices require large amounts of compressed fluid for negative pressure suction and/or a yarn sandwiching mechanism, which can lead to entanglement and are impractical for narrow spaces.
Innovation Solution
A yarn package knot releasing device that utilizes a yarn capturing portion for suction, a wound portion for multiple windings, and tension generating portions to create predetermined and secondary tensions, allowing the knot to be released without extensive fluid use or a sandwiching mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large amount of compressed fluid is supplied to generate negative pressure for strongly pulling the yarn end, then the knot can be released, but the device complexity and energy consumption increase
Solution Approach 1:
The pulling force is segmented into two components: a base suction force from the yarn capturing portion and an additional tension from the tension generating portion. This segmentation allows the system to achieve strong pulling force without requiring a single high-power suction system, thereby reducing device complexity and energy consumption.
Solution Approach 2:
The tension generating portion acts as an intermediary mechanism between the yarn capturing portion and the knot. It applies additional tension to the yarn portion at the end of winding, amplifying the effective pulling force on the knot without requiring the suction system to work at maximum capacity, thus reducing overall system complexity.
2Force
If a yarn sandwiching mechanism is provided in the yarn capturing portion to strongly pull the yarn end, then the knot can be released, but the size of the yarn capturing portion increases and it may not pass through narrow spaces
Solution Approach 1:
The sandwiching mechanism is extracted from the yarn capturing portion and replaced by a tension generating portion that acts on the yarn portion at the end of winding. This extraction maintains the pulling force capability while keeping the yarn capturing portion compact and suitable for narrow spaces.
Solution Approach 2:
The tension generating portion serves as an intermediary that applies the necessary tension force remotely, eliminating the need for a physical sandwiching mechanism within the yarn capturing portion. This allows the capturing portion to remain small and maneuverable.
3Force
If a yarn sandwiching mechanism is provided to strongly pull the yarn end, then the knot can be released, but the yarn may get entangled in the sandwiching mechanism
Solution Approach 1:
The sandwiching mechanism is completely removed from the system and replaced by a tension generating portion. This elimination removes the source of potential yarn entanglement while maintaining the ability to apply strong pulling force through the combination of suction and tension.
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
Effectively releases yarn package knots by generating multiple windings and tensions, avoiding the need for large fluid pressure and sandwiching mechanisms, thus ensuring practicality and space efficiency.
Implementation Method 1
a yarn capturing portion which captures the yarn end of the yarn portion at the end of winding by suction
Data Source
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AI summary
A yarn package knot releasing device 70 releases a knot KN including a slip knot of a yarn feeding package P1. The yarn package knot releasing device 70 includes a suction gun 71, a winding rod 72, a threading robot 74, and a control unit 94. A predetermined first tension is generated at a first portion YQ1 of a yarn portion at the end of winding by maintaining the suction of the suction gun 71 with respect to a yarn end Y1 of a yarn portion at the end of winding of a yarn Y wound on the winding rod 72 a plurality of times. A second tension larger than a first tension is generated at a second portion YQ2 of the yarn portion at the end of winding in a state in which the first tension is generated.