Movable Rotational Shafts in Draw Texturing Machines
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Solution Overview
Problem
The existing draw texturing machines with five-axial false-twisting devices face difficulties in yarn threading, especially when units are aligned in a base longitudinal direction, leading to narrow working spaces and increased complexity in maintaining consistent yarn quality and machine size.
Innovation Solution
The design includes movable rotational shafts and adjustable yarn guides to facilitate yarn threading, reduce the number of belts for power transmission, and use weights instead of circular plate members to maintain consistent yarn quality and reduce costs, while ensuring the machine's compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If five-axial false-twisting devices are aligned in a base longitudinal direction to process more yarns, then productivity is improved, but the working space for yarn threading becomes narrow making operation difficult
Solution Approach 1:
The patent applies the dynamics principle by making the rotational shafts movable rather than fixed. Specifically, the first and second independent rotational shafts can move in the base longitudinal direction to extend the working space during yarn threading operations, while returning to their original positions during normal operation. This dynamic adjustment resolves the contradiction by providing both compact alignment for high productivity and extended working space for easy operation.
2Device complexity
If the number of rotational shafts is reduced to suppress machine size increase, then device complexity is reduced, but yarn threading becomes more difficult due to narrower working space
Solution Approach 1:
The patent uses the dynamics principle to make rotational shafts movable in the base longitudinal direction. During yarn threading, the shafts extend to provide adequate working space, and during operation, they return to compact positions. This resolves the contradiction between reduced device complexity and ease of operation by dynamically adjusting the working space as needed.
3Reliability
If circular plate members are used for twisting yarn, then the twisting function is achieved, but unintentional high-speed rotation occurs reducing reliability
Solution Approach 1:
The patent applies the extraction principle by removing the circular plate members from the rotational shafts and replacing them with weights. This eliminates the harmful friction contact between circular plate members and yarns that causes unintentional high-speed rotation, while maintaining the necessary twisting function through the weighted shafts alone. The extraction of the problematic component directly resolves the reliability issue.
Solution Approach 2:
The patent replaces the circular plate members with simpler weight components. The weights are simpler, more reliable components that do not suffer from the friction-induced rotation problems of circular plate members. This substitution with simpler components resolves the harmful effect while maintaining the twisting function.
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
This configuration simplifies yarn threading, maintains consistent yarn quality across multiple units, reduces machine size, and minimizes operational costs by preventing unintentional high-speed rotation of rotational shafts.
Implementation Method 1
friction discs (circular plate members) which are provided at the respective rotational shafts. As the circular plate members are rotated in predetermined direction, a yarn which runs inside of the triangle while making a contact with the circular plate members is twisted.
Implementation Method 2
one of the two first independent rotational shafts being a first movable shaft placed on a near side which is closer to the working space than the other of the two first independent rotational shafts, the one of the two first independent rotational shafts being movable between a first operating position in which each of the five-axial false-twisting devices is in operation and a first yarn threading position
Data Source
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AI summary
An object of the present invention is to facilitate yarn threading in a draw texturing machine in which five-axial false-twisting devices are aligned in a base longitudinal direction. Each of the five-axial false-twisting devices includes 15: a first false-twisting unit 51 including first independent rotational shafts 72 and 73 and a common rotational shaft 71; and a second false-twisting unit 52 including second independent rotational shafts 74 and 75 and the common rotational shaft 71. The first independent rotational shafts 72 and 73 oppose the second independent rotational shafts 74 and 75 over the common rotational shaft 71 in the base longitudinal direction. The first false-twisting unit 51 is configured such that a yarn Y1 is threaded from a gap between the first independent rotational shafts 72 and 73, and the second false-twisting unit 52 is configured such that a yarn Y2 is threaded from a gap between the second independent rotational shafts 74 and 75. The first independent rotational shaft 73 is movable between a first operating position and a first yarn threading position which is on the near side of the first operating position, and the second independent rotational shaft 75 is movable between a second operating position and a second yarn threading position which is on the near side of the second operating position.