Draw Texturing Machine Pin Speed Control

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Solution Overview

Problem

Existing draw texturing machines with pin-type twisting units face limitations in versatility and operator proficiency, as they require fixed set values for motor rotation speeds, leading to difficulties in handling yarn type and production condition changes, and inexperienced operators struggle with fine adjustments, resulting in yarn breakage.

Innovation Solution

A draw texturing machine with a pin-type twisting unit that includes a setting unit for adjustable high and low rotation speeds, an operation unit for seamless switching between them, and a tension sensor for control, allowing for flexible handling of yarn types and conditions, reducing operator dependency, and preventing yarn breakage through controlled acceleration and tension management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the rotation number of the pin is swiftly increased to the rotation number for production, then productivity is improved, but yarn breakage occurs

Engineering Contradiction:

Improverotation number of pinVSAvoidyarn breakage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary action by setting a predetermined low rotation number before yarn threading occurs. The motor is controlled to rotate the pin at this reduced speed during the threading process, preventing yarn breakage. After threading is complete, the rotation number is then increased to the production speed, thereby achieving both reliable threading and high productivity during operation.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If a motor with fixed set values is used, then device complexity is reduced, but adaptability to different yarn types and production conditions deteriorates

Engineering Contradiction:

Improvemotor control systemVSAvoidhandling of yarn type changes

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The system applies parameter changes by allowing the rotation number parameter to be adjusted between a predetermined low value and a higher production value. This enables the same motor to adapt to different yarn types and production conditions without requiring multiple specialized motors, thereby maintaining simplicity while gaining versatility.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If a motor with stepless rotation number adjustment is used, then adaptability is improved, but ease of operation deteriorates due to difficulty in fine adjustment

Engineering Contradiction:

Improverotation number adjustabilityVSAvoidoperator adjustment difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The system applies local quality by providing two distinct rotation number levels: a predetermined low rotation number for the threading operation and a higher rotation number for production. This localized optimization allows automatic switching between these two specific states, eliminating the need for operators to perform difficult fine adjustments while maintaining adaptability to different operational phases.

Inventive Principle:

Principle #3Local quality

4Ease of operation

If the rotation number is switched in stages with fixed values, then ease of operation is improved, but versatility to handle different production conditions deteriorates

Engineering Contradiction:

Improveoperator adjustment easeVSAvoidresponse to production condition changes

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The system applies dynamics by enabling the rotation number to be switched between the predetermined low value and higher production values based on operational needs. This dynamic switching capability allows the system to easily adapt to different production conditions and yarn types while maintaining simple operation through automatic control, resolving the contradiction between ease of operation and versatility.

Inventive Principle:

Principle #15Dynamics

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 machine enhances versatility and reduces yarn breakage by allowing adjustable rotation speeds and tension control, enabling successful yarn threading regardless of operator proficiency and yarn type, with improved control over acceleration and twist number.

Implementation Method 1

a cylindrical pin retained while being in contact with circumferential surfaces of rollers attached to two rotational shafts, respectively, and which is configured to twist a yarn running inside the pin by rotating the pin by rotationally driving one of the two rotational shafts

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP3540103B1Draw texturing machine

Publication Date: 2020.11.18 TMT MACHINERY INC

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AI summary

In a draw texturing machine including a pin-type twisting unit, versatility is improved and yarn threading can be performed irrespective of the proficiency of an operator. The following members are provided: a setting unit 31 which is configured to set a set value regarding a high rotation number for yarn production and a set value regarding a low rotation number lower than the high rotation number, in regard to the rotation number of a pin 41 of the pin-type twisting unit; and an operation unit 32 provided for switching the rotation number of the pin 41 between the high rotation number and the low rotation number.