Double Vibrating Rake Head Asymmetric Rods Vibration Reduction

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Solution Overview

Problem

Harvesting tools with double vibrating reeds experience significant residual vibrations, making them uncomfortable and tiring to use for prolonged periods due to unbalanced antagonistic movements and mass distribution in the comb head.

Innovation Solution

A reed head with a double vibrating reed system featuring two oscillating reeds with opposing movements, connected via a transmission mechanism with offset eccentrics and connecting rods of different lengths, which synchronizes their motion and reduces the width of the comb head for easier penetration into vegetation, thereby minimizing vibrations transmitted to the user.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a double-comb head with opposing movements is used, then vibrations transmitted to the user are reduced, but residual vibrations remain significant and the tool remains uncomfortable for prolonged use

Engineering Contradiction:

Improvevibrations transmitted to userVSAvoidcomfort for prolonged use

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent applies asymmetry by using connecting rods of different lengths (first length and second length) to drive the two combs. This asymmetric configuration allows the combs to have different oscillation amplitudes while maintaining opposing movements, creating better vibration cancellation and reducing residual vibrations transmitted to the user during prolonged operation.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent changes the parameters of the oscillating combs by allowing them to have different oscillation amplitudes through the asymmetric connecting rod mechanism. This parameter variation optimizes the vibration cancellation effect while reducing residual vibrations, thereby improving user comfort during extended use.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the comb head width is reduced for easier penetration into vegetation, then the tool can more easily enter branches, but the vibration cancellation capability may be compromised

Engineering Contradiction:

Improvepenetration into vegetationVSAvoidresidual vibrations

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The asymmetric connecting rod mechanism enables the comb head to maintain an optimized width for vegetation penetration while preserving vibration cancellation capability. The different lengths of connecting rods allow the combs to oscillate with different amplitudes, creating effective vibration opposition within a compact head design.

Inventive Principle:

Principle #4Asymmetry

3Object-affected harmful factors

If synchronous oscillation of two combs is implemented, then vibration compensation is achieved, but the mass distribution creates unbalanced vibrations

Engineering Contradiction:

Improvevibration compensationVSAvoidunbalanced vibrations from mass distribution

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent resolves the mass distribution imbalance by using asymmetric connecting rods of different lengths. This creates different oscillation amplitudes for the two combs, which compensates for the unequal mass distribution and eliminates unbalanced vibrations while maintaining the synchronous opposing movement pattern.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The asymmetric connecting rod mechanism acts as a counterbalancing system, where the different lengths create opposing forces that compensate for the unbalanced mass distribution of the two combs, thereby reducing unbalanced vibrations transmitted to the tool structure.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

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 significantly reduces residual vibrations, enhancing comfort and reducing fatigue during extended use by balancing the antagonistic movements and bringing the moving masses closer to the median plane, resulting in a more compact and efficient harvesting tool.

Implementation Method 1

a crank-connecting rod type eccentric mechanism transmits the rotary motion of a motor to two combs arranged side by side

Methodology Applied

Scientific EffectEccentric mechanism: Eccentric

Implementation Method 2

The pivoting motion of the comb transmits vibrations, by reaction, to the entire tool

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Data Source

PatentEP3834600B1Rake head with double vibrating rake and harvesting tool provided with such a rake head

Publication Date: 2023.05.10 PELLENC SA

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AI summary

The invention relates to a double-vibrating comb head (20) and a harvesting tool equipped with the comb head. The comb head (20) comprises: - a first oscillating comb (22a) and a second oscillating comb (22b), with opposing movements, - a comb transmission (80) connecting a drive shaft to the first and second combs, the comb transmission (80) comprising a first connecting rod (60a) and a second connecting rod (60b), connecting a first eccentric (56a) and a second eccentric (56b) to the first and second oscillating combs. The first connecting rod (60a) and the second connecting rod (60b) have a first length and a second length, the second length being different from the first length. The invention finds applications in the fields of arboriculture and olive growing, in particular.