Yarn Knot Releasing Device Mechanical Pulling Mechanism
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Solution Overview
Problem
Conventional yarn package knot releasing devices require a large amount of compressed fluid to generate negative pressure for effectively pulling the yarn away from the package, and the inclusion of a sandwiching mechanism increases the device size and risks entanglement, making it impractical for narrow spaces.
Innovation Solution
A yarn package knot releasing device that uses a suction mechanism to capture the yarn end, a receiving portion to sandwich it, and a guide portion to move the receiving portion away from the package, allowing the knot to be released without high-pressure fluid supply and incorporating an elastic member with a tapered concave surface for secure sandwiching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of compressed fluid is supplied to generate negative pressure for strongly pulling the yarn, then the knot can be released effectively, but the device requires a large amount of compressed fluid and complex pneumatic system
Solution Approach 1:
The patent replaces the pneumatic suction mechanism with a mechanical pulling system. A pulling mechanism directly applies mechanical force to pull the yarn end away from the package, eliminating the need for compressed fluid supply and negative pressure generation. This substitution resolves the contradiction by achieving reliable knot release through direct mechanical action without consuming large amounts of compressed fluid.
2Reliability
If a yarn sandwiching mechanism is provided in the yarn capturing portion to strongly pull the yarn, then the knot can be released effectively, but the size of the yarn capturing portion increases and it may not pass through narrow spaces
Solution Approach 1:
The patent divides the yarn handling function into two separate components: a suction mechanism for capturing the yarn end and a pulling mechanism for removing it. The suction mechanism remains compact for navigating narrow spaces, while the pulling mechanism provides the necessary force remotely. This segmentation allows the yarn capturing portion to remain small while achieving effective knot release through the separate pulling action.
Solution Approach 2:
The patent introduces an intermediary pulling mechanism that acts between the yarn capturing portion and the yarn end. Instead of embedding a sandwiching mechanism within the capturing portion, the pulling mechanism serves as an intermediary that applies force to the captured yarn, enabling effective knot release without increasing the size of the capturing portion itself.
3Reliability
If a yarn sandwiching mechanism is provided to strongly pull the yarn, then the knot can be released effectively, but the yarn may get entangled in the sandwiching mechanism
Solution Approach 1:
The patent replaces the sandwiching mechanism with a pulling mechanism that applies tensile force directly to the yarn end. This mechanical substitution eliminates the clamping action that causes entanglement while maintaining effective yarn removal. The pulling mechanism draws the yarn through tension rather than constriction, preventing the harmful entanglement effect.
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 efficient release of knots without a large compressed fluid supply, providing a compact solution that prevents yarn entanglement and maintains yarn stability during removal.
Implementation Method 1
supplying a large amount of compressed fluid causing a negative pressure for strongly pulling a yarn
Data Source
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AI summary
A knot releasing device 70 releases a knot KN including a slip knot of a yarn feeding package P1. The knot releasing device 70 includes a suction gun 71, a receiving portion 72 which contacts the suction gun 71 to sandwich a first yarn end Y1 captured by the suction gun 71 by suction, an air cylinder 73 which guides the receiving portion 72 from a first position PA to a second position PB in a direction moving away from a yarn feeding package P1, and a threading robot 74 which guides the suction gun 71 to the second position while guiding the receiving portion 72 by the air cylinder 73 in a state in which the suction gun 71 contact the receiving portion 72 at the first position.