Rotary Motor Traversing Unit with Eccentric Conversion

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Solution Overview

Problem

Existing yarn guide systems for textile machines require complex control mechanisms for reversible drives, leading to increased costs and susceptibility to faults, and do not efficiently prevent yarn cutting into take-off rollers.

Innovation Solution

A traversing unit with a rotary motor-driven yarn guide unit and a conversion element, such as an eccentric disk, that converts rotary motion into linear reciprocating movement, allowing for simplified control and reduced fault susceptibility, along with a sensor for center position detection to ensure even wear and easy yarn reinsertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a reversible individual drive is used to traverse the yarn, then the yarn guide unit can be positioned precisely, but the control mechanism becomes complex and fault-prone

Engineering Contradiction:

Improvepositioning precisionVSAvoidcontrol mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Instead of using a reversible motor that changes rotation direction to achieve reciprocating motion, the patent uses a unidirectional rotary motor combined with a conversion element (eccentric mechanism) that transforms continuous rotation into linear reciprocating motion. This inversion of the approach simplifies the drive system by eliminating the need for reversible motor control while maintaining positioning precision through the conversion element's mechanical design.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If a reversible motor is used for the individual traversing drive, then bidirectional motion is achieved, but the cost and fault susceptibility increase

Engineering Contradiction:

Improvebidirectional motion capabilityVSAvoidfault susceptibility

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces the reversible motor with a unidirectional rotary motor coupled with a conversion element. The conversion element mechanically transforms the continuous unidirectional rotation into bidirectional reciprocating motion of the yarn guide unit. This approach maintains the bidirectional motion capability while significantly improving reliability by using a simpler, less fault-prone unidirectional motor.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If the yarn guide unit remains stationary, then the structure is simple, but the yarn cuts into the take-off rollers

Engineering Contradiction:

Improvestructural simplicityVSAvoidyarn cutting into rollers

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces dynamic reciprocating motion of the yarn guide unit along the axial direction of the take-off rollers. This dynamic traversal prevents the yarn from remaining in a fixed position that would cause cutting, while the overall structure remains relatively simple through the use of a compact conversion element and straightforward actuation mechanism.

Inventive Principle:

Principle #15Dynamics

4Ease of operation

If a rotary motor with conversion element is used, then control is simplified and reliability improved, but the mechanism requires additional components

Engineering Contradiction:

Improvecontrol simplicityVSAvoidnumber of components

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The conversion element acts as an intermediary between the simple unidirectional rotary motor and the yarn guide unit. It translates the continuous rotation into the required reciprocating motion, allowing the motor to be controlled simply through continuous rotation while achieving the complex reciprocating motion needed for yarn traversal and roller protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution provides a cost-effective, reliable yarn guide system that prevents yarn cutting into rollers, ensures even wear, and simplifies yarn reinsertion by using a rotary motor with a conversion element and sensor for precise positioning, enhancing operational efficiency and reducing maintenance.

Implementation Method 1

the conversion element comprises an eccentric element which interacts with at least one guide element

Methodology Applied

Scientific EffectEccentric mechanism: Eccentric

Data Source

PatentEP3476787B1Traversing unit, method for operating a traversing unit and workstation with a traversing unit

Publication Date: 2019.10.23 MASCHINENFABRIK RIETER AG

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AI summary

The invention relates to a changing unit (1) for changing a yarn (3) relative to a take-up roller pair (9) of a work station (2) of a textile machine, comprising a yarn guide unit (12), a changing unit drive (13) for driving the yarn guide unit (12), and a conversion element (14) by means of which a rotary movement (ω) of the changing unit drive (13) can be converted into a linear, reciprocating movement of the yarn guide unit (12). According to the invention, the changing unit drive (13) is designed as a rotating motor, and at least one center position (M) of the yarn guide unit (12) is detectable by means of a sensor (18). Furthermore, the invention relates to a method for operating such a changing unit (1). The invention also relates to a work station (2) with such a changing unit (1).