Draper Conveyor End Coupling for Harvest Header Sealing
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Solution Overview
Problem
Conventional draper headers face issues with unconnected draper edges catching on the cutter bar, premature wear, and failure at the connector ends, leading to improper sealing and reduced durability.
Innovation Solution
A connection system is introduced where the draper canvas ends are coupled using a flexible strip portion with recessed portions and bolts, forming a continuous loop that maintains contact with the cutter bar without protrusions, ensuring a seamless seal and preventing material entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connector ends are used to join draper canvas, then the draper can be assembled, but the unconnected edges catch on the cutter bar causing premature wear and failure
Solution Approach 1:
The connector ends are merged with the draper canvas body through recessed portions that allow the additional strip to bridge across the joint. This integration eliminates protruding edges that would otherwise catch on the cutter bar, combining the connector function with the sealing surface to prevent harmful catching while maintaining structural integrity.
Solution Approach 2:
The recessed portions are created locally at the connector ends where they join the draper canvas. This localized modification allows the additional strip to make contact with the cutter bar sealing surface without the connector protruding, providing the specific quality of a flush surface at the critical sealing location while leaving the rest of the draper structure unchanged.
2Reliability
If the draper ends are connected with protruding connectors, then the connection is structurally sound, but protrusions prevent proper sealing and allow material entry
Solution Approach 1:
The connector ends are nested within the draper canvas thickness by creating recessed portions. The additional strip then bridges across these recessed areas, nesting the connection structure within the overall draper profile. This allows the connection to be structurally sound while the outer surface remains flush for proper sealing against the cutter bar.
3Reliability
If the additional strip extends to the rear edge of the base layer, then sealing is maximized, but the connector becomes too complex and difficult to manufacture
Solution Approach 1:
The additional strip extends partially across the draper canvas, covering the recessed connector portions and providing adequate sealing contact with the cutter bar. Rather than extending the full length to the rear edge, this partial extension achieves the necessary sealing effectiveness while keeping the connector design simple and manufacturable with standard materials and processes.
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 connection system prevents the draper edges from catching on the cutter bar, maintains a proper seal, and reduces premature wear and failure, enhancing the durability and operational efficiency of the draper header.
Implementation Method 1
a clamping assembly for clamping the upwardly standing edges together
Implementation Method 2
an additional strip of a resilient material attached on to the outer surface of the base layer so as to stand outwardly from the outer surface of the base layer
Implementation Method 3
the strip portion is fastened by first and second bolts respectively to the first and second portions
Data Source
Figure 1
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Figure 3
AI summary
A draper having an additional strip of a resilient material attached on to the outer surface of the base layer at the front edge is connected at ends to form a continuous loop by a coupling comprising a first and second end edge which are turned so as to stand upwardly from the band and a clamping assembly clamping the upwardly standing edges together. The additional band at each end of the canvas is recessed from the outer surface and a strip portion formed of a flexible continuous strip material extending longitudinally of the additional band connects the two ends. The strip is bolted at each end to the recessed portion and has a thickness so that its outer surface is slightly less than that of the additional band thus forming in effect a continuation of the band bridging the ends of the canvas.