Jacquard Machine Yarn Moving Elements for Friction Reduction

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Solution Overview

Problem

Face-to-face weaving machines struggle with the enhanced moving behavior of yarns during the weaving process, particularly when weft yarns need to be introduced at multiple height positions, leading to increased frictional interactions between pile warp yarns.

Innovation Solution

The implementation of a face-to-face weaving machine with a jacquard machine setup, where yarn moving elements are divided into sub-groups and associated with specific pile warp yarns, allowing for increased length distribution in the warp direction, and the use of setting bars connected to position adjustment bars for precise height positioning, reducing frictional interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If yarn moving elements are arranged in dense groups to cover all pile warp yarns, then complete coverage of warp yarns is achieved, but frictional interaction between adjacent yarns increases

Engineering Contradiction:

Improvecoverage of pile warp yarnsVSAvoidfrictional interaction between yarns

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The yarn moving elements are divided into multiple sub-groups arranged alternately in the warp direction. This segmentation distributes the elements over a longer length, reducing the density and frictional interaction between adjacent elements while maintaining complete coverage of all pile warp yarns through the alternating pattern.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If setting bars are positioned at fixed heights to simplify the mechanism, then device complexity is reduced, but inability to adjust for multiple weft insertion heights remains

Engineering Contradiction:

Improvemechanism simplicityVSAvoidadjustment for multiple weft heights

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The setting bars are made adjustable in height through connection to position adjustment bars. This allows the height position of setting bars to be dynamically changed according to different weaving requirements, enabling multiple weft insertion heights while maintaining a relatively simple overall mechanism structure.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If position adjustment bars are used to precisely control setting bar heights, then positioning precision is improved, but device complexity increases

Engineering Contradiction:

Improveheight positioning precisionVSAvoidnumber of adjustment components

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The position adjustment bars serve multiple functions: they support the setting bars, enable height adjustment, and can be connected in different configurations. This multi-functionality reduces the need for separate adjustment mechanisms for each setting bar, thereby achieving precise positioning while limiting the increase in device complexity.

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

This configuration enables easier movement of pile warp yarns in the height direction with reduced frictional interaction, facilitating the formation of sheds in face-to-face weaving processes by allowing precise adjustment and alternating arrangements of yarn moving elements and setting bars.

Implementation Method 1

The cord 16 is guided around a first pulley 26. An output cord 28 of the yarn moving mechanism is guided around a second pulley 30.

Methodology Applied

Scientific EffectPulley: Pulley

Implementation Method 2

By adjusting a height position of these position adjustment bars and/or an inclination of these position adjustment bars relative to a second direction which substantially corresponds to a warp direction, a height position of the setting bar 36 can be adjusted.

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentEP3371356B1Jacquard machine, face-to-face weaving machine comprising at least one jacquard machine, and method of setting up a jacquard machine

Publication Date: 2021.03.17 VANDEWIELE NV

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AI summary

A jacquard machine comprises a plurality of yarn moving elements (92) and in association with each yarn moving element (92) a yarn moving mechanism (12) having an output cord (28) connected to the yarn moving element (92), a plurality of setting bars (36) extending substantially in a first direction (D1) corresponding to a weft direction (WE) and positioned adjacent to each other substantially in a second direction (D2) corresponding to a warp direction (WA), each setting bar (36) having two longitudinal end regions (38, 40) and a cooperation region (42) arranged between the longitudinal end regions (38, 40) for the cooperation with a plurality of yarn moving mechanisms (12), a plurality of position adjustment bars (44, 46, 48, 50) extending substantially in the second direction (D2), wherein in each one of the two longitudinal end regions (38, 40) of the setting bars (36) two position adjustment bars (44, 46, 48, 50) are provided adjacent to each other, and a plurality of connecting means (72) for connecting the setting bars (36) to the position adjustment bars (44, 46, 48, 50), wherein in each longitudinal end region (38, 40) of each setting bar (36) one connecting means (72) is provided such as to be connectable to either one of the two position adjustment bars (44, 46, 48, 50) arranged in a respective one of the longitudinal end regions (38, 40) of the setting bars (36).