Cotton Picker Drum Subassembly with Cam-Plate Alignment

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Solution Overview

Problem

Conventional cotton harvester row units face challenges in aligning and attaching picker bars to drums due to the need for shimming and limited accessibility, requiring significant time and effort.

Innovation Solution

A subassembly design featuring a cam-plate with markers and a linkage assembly, allowing for easier alignment and attachment of picker bars to the drum, utilizing a laser alignment system to ensure proper positioning and rotation of the drum within the frame.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the drum is secured within the frame before attaching picker bars, then the frame structure is stabilized, but alignment of the drum and doffer becomes difficult requiring shimming and considerable time

Engineering Contradiction:

Improveframe structure stabilityVSAvoiddrum and doffer alignment precision

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The picker bars are attached to the drum before the drum is secured to the frame. This preliminary assembly allows the picker bars to be pre-aligned with the drum, and the alignment features (such as alignment pins or marks) can be established during this initial stage, avoiding the need for difficult alignment adjustments after the drum is fixed in the frame.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The assembly process is divided into separate stages: first assembling the drum with picker bars as a subassembly, then integrating this subassembly into the frame. This segmentation allows alignment operations to be performed on the drum-subassembly unit rather than trying to align components individually within the constrained frame space.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If the drum is positioned in the frame, then the row unit structure is complete, but accessibility to certain portions of the drum is limited requiring rotation to attach picker bars

Engineering Contradiction:

Improverow unit structure completenessVSAvoidpicker bar attachment accessibility

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Picker bars are attached to the drum before the drum is positioned in the frame. This allows all picker bar attachments to be performed while the drum is accessible and can be rotated for optimal positioning, rather than attempting to attach picker bars after the drum is constrained within the frame structure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The conventional sequence is inverted: instead of positioning the drum in the frame first and then attaching picker bars, the picker bars are attached to the drum first, and only then is the drum integrated into the frame. This reversal of the assembly sequence resolves the accessibility problem.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If shimming is performed to achieve proper alignment, then alignment precision is improved, but assembly time and effort increase significantly

Engineering Contradiction:

Improvealignment precisionVSAvoidassembly time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

Alignment features such as alignment pins, marks, or keyed interfaces are designed into the drum and picker bar assembly before installation. This preliminary preparation ensures that when the drum-subassembly is installed in the frame, proper alignment is achieved through the pre-established features rather than requiring time-consuming shimming operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The drum and picker bar assembly includes self-aligning features that automatically ensure proper positioning when installed. Alignment pins fit into corresponding holes, or marked surfaces guide the assembly into the correct position, allowing the structure to self-align without external adjustment tools or procedures.

Inventive Principle:

Principle #25Self-service

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

Streamlines the assembly process by enabling easier alignment and attachment of picker bars, reducing the time and effort required for alignment and attachment, and facilitating ergonomic assembly outside the frame.

Implementation Method 1

The first marker is a laser; and when the drum mount is engaged with the drum and in the second position, the second marker is configured to pass through a beam of the laser as the drum is rotated relative to the cam-plate.

Methodology Applied

Scientific EffectLaser: Laser

Data Source

PatentUS11343966B2Frame design for a cotton picking unit and method of use

Publication Date: 2022.05.31 DEERE & CO

AI summary

A row unit for an agricultural machine includes a frame, a floor, and a subassembly discrete from the frame and the floor. The subassembly is configured to be coupled to the floor and the frame and positioned within the frame during operation of the row unit. The subassembly includes a cam-plate including a top side, a bottom side, and a cam-track defined in the bottom side. The subassembly also includes a drum; a plurality of picker-bars coupled to the drum, and a linkage assembly including a first end coupled to the picker-bar and a second end coupled to a roller positioned in the cam-track. The subassembly is assembled prior to being positioned in the frame.