Harvester Sieve Louvre Offset Adjustment With Stepped Lath Control

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Solution Overview

Problem

Existing agricultural harvesters face challenges in adjusting the spacing between louvres on sieves to optimize grain separation efficiency based on varying crop conditions, as current adjustment mechanisms are limited to independent adjustment of discrete sections and lack simultaneous control over main and extension louvres.

Innovation Solution

An adjustment arrangement that utilizes a rotatable elongate element with stepped shoulders and stop surfaces to simultaneously adjust the offset spacing between main and extension louvres on sieves, allowing for incremental and synchronized adjustment of louvre spacing based on crop characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If independent adjustment mechanisms are used for discrete sections of louvres, then each section can be adjusted separately, but simultaneous control over main and extension louvres is lost

Engineering Contradiction:

ImproveIndependent adjustment capabilityVSAvoidMultiple separate adjustment mechanisms

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple adjustment mechanisms into a single integrated adjustment arrangement. The elongate element with stepped shoulders serves as a unified component that simultaneously controls both main louvres and extension louvres, eliminating the need for separate adjustment mechanisms for each section while maintaining independent adjustability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The adjustment arrangement is designed as a universal mechanism that can adjust different sections of louvres (main and extension) through a single operational interface. The elongate element with multiple stepped surfaces provides multi-functional capability, allowing one component to perform what previously required multiple separate mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If a single adjustment mechanism controls all louvres, then device complexity is reduced, but precise incremental adjustment of offset spacing is limited

Engineering Contradiction:

ImproveNumber of adjustment mechanismsVSAvoidLouvre spacing precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The adjustment mechanism is segmented into multiple discrete stepped surfaces on the elongate element. Each stepped surface represents a specific incremental position, allowing precise control of louvre spacing. This segmentation provides discrete adjustment steps that maintain manufacturing precision while using a single mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adjustment mechanism incorporates rotational movement of the elongate element, transforming a static structure into a dynamic one. The rotation allows the operator to select different stepped surfaces, providing incremental adjustment capability while maintaining the simplicity of a single mechanism.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If manual adjustment of louvre spacing is used, then adaptability to crop conditions is improved, but adjustment time and operational complexity increase

Engineering Contradiction:

ImproveAdjustment to crop conditionsVSAvoidTime for manual adjustment

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The stepped surfaces on the elongate element are pre-configured with specific spacing increments optimized for different crop conditions. This preliminary arrangement of adjustment positions allows the operator to quickly select the appropriate setting without complex calculations or time-consuming adjustments, reducing operational time while maintaining adaptability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4091433B1Adjustment arrangement for offset spacing between louvres in a sieve of an agricultural harvester

Publication Date: 2026.01.28 CNH IND BELGIUM NV

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AI summary

A sieve (48, 50) for use in an agricultural harvester (10) includes first and second adjustment laths (116A, 116B) arranged longitudinally adjacent to each other. The first and second adjustment laths (116A, 116B) are movable in fore and aft directions relative to an air flow direction (Y) through the sieve. The first adjustment lath (116A) is connected with a first set of louvres (112A) and the second adjustment lath (116B) is connected with a second set of louvres (112B). An adjustment arrangement (120) for adjusting an offset spacing (X) between a first and second set of louvres (112A, 112B) includes a rotatable elongate element (122) with a longitudinally facing stepped shoulder (124) and at least one stop surface (126). The elongate element (122) is connected with each of the first and second adjustment laths (116A, 116B). The stepped shoulder (124) includes a plurality of stepped surfaces (124A) which are selectively engagable with the at least one stop surface (126). The stepped surfaces (124A) respectively define incremental offset spacings (X) between the first and second set of louvres (112A, 112B).