Ring-Spinning Yarn Piecing With Suction-Guided Positioning

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Solution Overview

Problem

Existing automatic yarn piecing devices in ring spinning machines fail to effectively piece broken yarns due to parameters like yarn count, machine speed, and humidity, leading to repeated attempts and significant yarn waste.

Innovation Solution

An automatic yarn piecing apparatus with a lifting unit, suction unit, and piecing unit, including a positioning device and yarn joining device, which moves in horizontal and traverse directions to merge the broken yarn end with drafted fibers, using negative pressure and actuators to ensure accurate over-piecing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If automatic piecing devices are used to replace manual piecing, then productivity is improved, but reliability deteriorates due to failure in binding broken yarn with delivery fibres

Engineering Contradiction:

Improvepiecing operation efficiencyVSAvoidpiecing success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The piecing device is divided into separate functional modules: a suction unit for capturing broken yarn ends, a positioning device for precise location, and a piecing unit for actual joining. This segmentation allows each module to be optimized independently, improving both productivity through automation and reliability through specialized functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces manual mechanical piecing operations with an automated system that uses suction forces, positioning mechanisms, and controlled piecing units. This substitution eliminates human variability in piecing operations, thereby improving reliability while maintaining high productivity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If multiple piecing attempts are made to ensure success, then reliability is improved, but loss of substance increases due to yarn waste

Engineering Contradiction:

Improvepiecing success rateVSAvoidyarn waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The positioning device performs preliminary positioning of the broken yarn end and delivery fibre before the actual piecing operation. This preliminary action ensures that both yarn components are correctly aligned and positioned, significantly increasing the success rate of the first piecing attempt and reducing the need for repeated attempts that would waste yarn.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback mechanisms that monitor the piecing process in real-time, allowing for immediate adjustment or correction. This feedback enables the device to compensate for positioning errors or yarn tension variations, improving success rate without requiring multiple attempts, thus minimizing yarn waste.

Inventive Principle:

Principle #23Feedback

3Productivity

If the piecing device moves quickly to maintain machine speed, then productivity is improved, but manufacturing precision deteriorates due to inaccurate positioning

Engineering Contradiction:

Improvespinning operation continuityVSAvoidyarn positioning accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The piecing device employs dynamic positioning capabilities, allowing it to adjust its position and movement speed based on real-time conditions. The device can move quickly when conditions permit to maintain productivity, but slows down or adjusts position when precise positioning is needed, thereby achieving both high productivity and manufacturing precision.

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 apparatus achieves reliable and efficient piecing of broken yarn ends, reducing waste by ensuring high success rates and accurate merging of yarns with drafted fibers.

Implementation Method 1

The tail end of the broken yarn is accommodated in the tubular mouth by applying a negative pressure through the tubular mouth

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Data Source

PatentEP3913121B1An automatic yarn piecing apparatus and a method thereof

Publication Date: 2025.09.17 LAKSHMI MACHINE WORKS LTD

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AI summary

The present invention relates to an automatic yarn piecing apparatus (9) of a textile ring spinning machine (1) and a method of piecing the broken yarns to drafted fibre strands. The yarn piecing apparatus (9) comprises a lifting unit for lifting the broken yarn from the cop (8), a suction unit (10) adapted to accommodate the broken yarn lifted by the lifting unit, and a piecing unit (11) configured to join a tail end (15) of the broken yarn to a fibre strand drafted by a drafting unit (4). The piecing unit (11) comprises a positioning device (12) adapted to perform an over-piecing process to merge the tail end (15) of the broken yarn to the fibre strand.