Autoleveller Draw Frame Drive Unit with Independent Regulating Motor

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Solution Overview

Problem

Existing autoleveller draw frames with differential gears are maintenance-intensive and prone to failure, with complex motor replacement processes.

Innovation Solution

An autoleveller draw frame with a drive unit featuring a main motor for constant speed and a drive-independent regulating motor, where the regulating motor adjusts the rotational speed of roller combinations using an electrical signal based on the main rotational speed, eliminating the need for mechanical transmission and differential gears.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a differential gear is used to transmit rotational speed from the main motor to the regulating motor, then the basic rotational speed can be superimposed, but the device becomes highly maintenance-intensive and prone to failure

Engineering Contradiction:

Improverotational speed regulation capabilityVSAvoidoperational reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces the mechanical differential gear system with an electrical control system. The regulating motor is driven independently by a regulating motor drive based on electrical signals, eliminating the mechanical transmission components (differential gear, belts, gears) that caused maintenance issues and reliability problems while preserving the rotational speed regulation capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If a differential gear system is used for speed regulation, then draft adjustment is possible, but the maintenance requirements increase significantly

Engineering Contradiction:

Improvedraft adjustabilityVSAvoidmaintenance requirements

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The mechanical differential gear system is replaced with an electrical drive system where the regulating motor drive receives electrical signals to control the regulating motor independently. This eliminates mechanical wear components requiring maintenance while preserving the ability to adjust draft through electronic speed control of the regulating motor.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If mechanical transmission components are used to connect main motor and regulating motor, then speed superimposition is achieved, but the drive unit complexity increases

Engineering Contradiction:

Improvespeed superimposition capabilityVSAvoiddrive unit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent eliminates mechanical transmission components (differential gear, belts, intermediate shafts) by using independent electrical drives. The regulating motor drive receives electrical signals to control the regulating motor independently, achieving speed superimposition through electronic control rather than mechanical transmission, thereby simplifying the drive unit structure.

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 design reduces maintenance requirements, allows for precise control of draft speeds, and simplifies the drive unit, enhancing operational reliability and efficiency.

Implementation Method 1

a regulating motor (17) for regulating the rotational speed of at least one second roller combination (6, 6'), wherein, due to the regulation, the rotational speed of the second roller combination (6, 6') is changeable from a basic rotational speed into an autolevelling speed

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Data Source

PatentUS20240003064A1Autoleveller draw frame, method for operating an autoleveller draw frame, and method for converting an autoleveller draw frame

Publication Date: 2024.01.04 MASCHINENFABRIK RIETER AG

AI summary

An autoleveller draw frame includes a drafting system having a plurality of roller combinations. A drive unit configured with the plurality of roller combinations has a main motor that drives a first roller combination at a constant main rotational speed. A regulating motor regulates a rotational speed of a second roller combination wherein, due to the regulation, the rotational speed of the second roller combination is changeable from a basic rotational speed into an autolevelling speed. The basic rotational speed depends on the main rotational speed and the autolevelling speed is independent of the main rotational speed, wherein the drafting of the fibrous web is adjustable. The regulating motor is drive-independent of the main motor to drive the second roller combination at the autolevelling speed according to an electrical signal that is based on the main rotational speed.