Venturi Jet Yarn Suction for Ring Spinning Piecing

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Solution Overview

Problem

Existing automatic piecing units in ring spinning machines face difficulties in detaching broken yarn ends from the spinning cop efficiently, leading to increased size and cost due to the use of large suction motors, which hinder their widespread implementation.

Innovation Solution

The use of venturi jets, instead of suction motors, to create a vacuum for picking broken yarn ends, combined with air jets around the cop to assist in lifting the yarn, reduces the need for large motors and minimizes space and cost in the automatic piecing unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If suction motors are used to create vacuum for picking broken yarn ends, then reliable yarn picking is achieved, but the size, cost, and mass of the automatic piecing unit increase significantly

Engineering Contradiction:

Improveyarn picking reliabilityVSAvoidpiecing unit mass

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent replaces the mechanical suction motor system with a pneumatic jet system. High-velocity air jets create dynamic pressure differences that generate suction forces to pick up broken yarn ends, eliminating the need for heavy electric motors and mechanical vacuum generation equipment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses compressed air jets directed at the broken yarn end to create a pneumatic suction effect. The high-velocity air stream generates negative pressure zones that lift and transport the yarn end to the piecing point, replacing mechanical vacuum systems with pneumatic principles.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If suction motors are used to create vacuum for picking broken yarn ends, then reliable yarn picking is achieved, but the cost of the automatic piecing unit increases

Engineering Contradiction:

Improveyarn picking reliabilityVSAvoidpiecing unit cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive suction motors with simpler pneumatic jet components. The compressed air system requires fewer moving parts, less precision manufacturing, and lower-cost components while achieving the same functional outcome of reliable yarn end pickup.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The pneumatic jet system uses consumable compressed air instead of expensive, maintenance-intensive motors. The air jets are simple, inexpensive components that can be replaced if needed, rather than investing in costly motor assemblies with complex electrical and mechanical systems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If suction motors are used to create vacuum for picking broken yarn ends, then yarn picking function is achieved, but the space occupied in the automatic piecing unit increases

Engineering Contradiction:

Improveyarn picking reliabilityVSAvoidpiecing unit space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent replaces bulky suction motors with compact pneumatic jet nozzles. The air jet system requires minimal space for component housing and air delivery mechanisms, allowing for a more compact piecing unit design that fits within constrained spaces on ring spinning frames.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution enables efficient and cost-effective automatic piecing of broken yarns without unwinding the entire cop, reducing the size and expense of the piecing unit while maintaining reliable yarn picking and piecing operations.

Implementation Method 1

A venturi jet (5) is connected to the suction pipe (2) and receives air from a pressure supply port. A movement of air through a constricted section of the venturi jet (5) creates vacuum in the suction mouth (3) to suck the broken yarn end from the cop (4) into the suction pipe (2).

Methodology Applied

Scientific EffectVenturi effect: Venturi Effect

Implementation Method 2

plurality of air jets are provided around the bottom of the cop (4) to assist in lifting the broken yarn end

Methodology Applied

Scientific EffectAir jet lifting: Jet

Data Source

PatentEP3736361B1Yarn suction arrangement for piecing unit of a textile machine

Publication Date: 2022.03.09 LAKSHMI MACHINE WORKS LTD

Figure 1
Figure 2

AI summary

An automatic piecing unit (1) for piecing broken yarns in a ring spinning machine is disclosed. A suction assembly for sucking a broken yarn end from a cop (4) is provided. The suction assembly comprises a suction pipe (2) having a suction mouth (3) present at an end facing the cop (4). The suction pipe (2) is positioned at a predetermined height over the cop (4), to suck the broken yarn end from the cop (4). A first venturi jet (5a) is affixed with the suction mouth (3) to receive compressed air from a pressure supply port. Movement of the compressed air through a constricted section of the first venturi jet (5a) creates vacuum in the suction mouth (3) to suck the broken yarn end from the cop (4) into the suction pipe (2).