Auxiliary Yarn Piecing at Ring Spinning Stations With Air Suction

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Solution Overview

Problem

Existing yarn piecing systems face difficulties in detecting and piecing broken yarn ends, especially after bobbin changes or when spindle tubes are empty, and require complex threading operations that are prone to failure due to poor adherence and high precision demands.

Innovation Solution

A yarn piecing system that uses a yarn feeding nozzle with integrated air suction and blowing means, along with a gripping element, to retain and position auxiliary yarn tangentially on the spindle tube without rotating it, ensuring precise threading and piecing operations using a single handling tool.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the spindle tube is rotated to maintain yarn tension during threading, then the yarn remains taut and prevents sagging, but the threading operation becomes more difficult and complex to perform with high precision

Engineering Contradiction:

Improveyarn tension stabilityVSAvoidthreading precision

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

Instead of rotating the spindle tube to maintain yarn tension, the invention inverts the approach by using a stationary spindle tube and maintaining yarn tension through the yarn feeding nozzle positioning and air flow control. This allows precise threading operations without the complexity of spindle rotation during threading.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The yarn feeding nozzle acts as an intermediary device that maintains yarn tension and positions the yarn end without requiring spindle tube rotation. The nozzle serves as a mediator between the yarn supply and the spindle, enabling precise control of yarn position during threading operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the free end of auxiliary yarn is supplied to an empty spindle tube after doffing, then the wrapping operation can proceed, but the adherence of yarn to the spindle tube surface is poor leading to wrapping failure

Engineering Contradiction:

Improvewrapping operation continuityVSAvoidwrapping operation reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary actions by detecting yarn breakage before the spindle tube becomes completely empty and initiates the piecing sequence proactively. The yarn feeding nozzle is positioned and air flow is established in advance to ensure proper yarn adherence when contact with the spindle tube occurs, preventing wrapping failure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention uses pneumatic means (air flow through the yarn feeding nozzle) to improve yarn adherence to the spindle tube surface during the wrapping operation. The air flow helps control yarn positioning and enhances friction/adherence between the yarn and spindle tube, preventing slippage and wrapping failure.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Device complexity

If a single yarn handling tool is used for both threading and piecing operations, then the device complexity is reduced, but the operational precision and reliability may be compromised

Engineering Contradiction:

Improvenumber of handling toolsVSAvoidthreading and piecing precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The yarn handling tool is designed with multi-functionality, integrating both threading and piecing operations into a single device. The tool can adapt its configuration through the yarn feeding nozzle and air flow control to perform different functions with the same basic structure, reducing device complexity while maintaining operational precision through controlled air flow and positioning mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 system improves reliability and precision of threading and piecing operations by maintaining yarn tension and simplifying the process, allowing for efficient yarn piecing with empty or full spindle tubes, and reducing operational failures.

Implementation Method 1

air suction means arranged to suction air into the yarn feeding nozzle

Methodology Applied

Scientific EffectAir suction: Suction

Implementation Method 2

air blowing means arranged to propel air into the yarn feeding nozzle

Methodology Applied

Scientific EffectAir blowing: Jet

Data Source

PatentEP4063543B1A yarn piecing system and method for piecing auxiliary yarn at a spinning station of a ring spinning machine

Publication Date: 2025.10.22 PINTER CAIPO

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Figure 4a~4b

AI summary

A yarn piecing system and method for piecing auxiliary yarn at a spinning station of a ring spinning machine, comprising yarn supplying means for supplying a free end of auxiliary yarn (12), yarn fastening means (11) for fastening auxiliary yarn (12) on outside the yarn feeding nozzle (10) to form a threading section ("S") of auxiliary yarn (12) and, automatic handling means (7) for handling the yarn supplying means and the yarn fastening means (11). The system is characterized in that said automatic handling means include a yarn handling tool (8) with a yarn feeding nozzle (10), and in that the system comprises air suction means (13) arranged to suction air into the yarn feeding nozzle (10), and processing and control means configured to supply an activation signal to said air suction means in order to suction air into the yarn feeding nozzle (10).