Adjustable Pull Point Reel Mower Weight Distribution
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Solution Overview
Problem
Existing reel gang mowers face issues with uneven aftercut appearance due to variations in grass conditions, as front and rear cutting units can leave marks in overlap areas where grass is rolled and cut twice, leading to undesirable streaks in the cut swath.
Innovation Solution
The reel gang mower is equipped with multiple adjustable pull point locations for each cutting unit, allowing users to change the fore-and-aft weight distribution by positioning the rear pivot link's attachment point on different holes, thereby altering the weight distribution between the front and rear rollers to minimize marking and achieve a uniform cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed pull point location is used for each cutting unit, then the structure is simple and easy to operate, but the aftercut appearance deteriorates due to marking in overlap areas where grass is rolled and cut twice
Solution Approach 1:
The pull point location is made adjustable rather than fixed. The rear pivot link can be positioned at different holes along its length, allowing the pull point to be dynamically repositioned to optimize weight distribution and eliminate marking in overlap areas while maintaining simple operation through a straightforward adjustment mechanism
2Object-generated harmful factors
If the rear pivot link is positioned to provide optimal weight distribution for minimizing marking, then the aftercut appearance improves, but the device complexity increases due to multiple adjustment holes and positioning options
Solution Approach 1:
The rear pivot link is segmented with multiple discrete adjustment holes positioned at specific locations along its length. This segmentation allows the user to select from a limited number of predetermined positions rather than continuous adjustment, maintaining relative simplicity while providing sufficient weight distribution options to eliminate marking in overlap areas
3Adaptability or versatility
If multiple adjustable pull point locations are provided for each cutting unit, then the adaptability to different grass conditions improves, but the device complexity increases
Solution Approach 1:
The adjustment capability is applied locally to each cutting unit independently, with each unit having its own rear pivot link with multiple adjustment holes. This allows different weight distributions to be optimized for different grass conditions at different locations along the gang mower, providing adaptability without requiring complex centralized control systems
Data Source
AI summary
A reel gang mower has a row of front reel cutting units and a row of rear reel cutting units that cut an unbroken swath of grass in each pass. Each cutting unit is connected for propulsion to the mower frame by a four-bar linkage having front and rear pivot links that converge towards a focal point that establishes a virtual pull point through which propulsive force acts on the cutting unit. The rear pivot links can attach to the mower frame at a selected one of different attachment points to thereby longitudinally shift the pull point fore-and-aft relative to the center of gravity of the cutting unit, thus changing the fore-and-aft weight distribution. The rear cutting units in the gang can be configured to have a tail heavy weight distribution relative to the front cutting units to help eliminate marking in the overlap areas between the cutting units.