Mower Unit Guide Height Adjustment for Complete Cutting
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Solution Overview
Problem
Conventional riding type mower units often leave uncut grass or lawn due to incomplete cutting, particularly at specific regions where the mower blades and guides interact.
Innovation Solution
The mower unit incorporates blades and guides designed such that the lower end position of the guides is constructed to be higher than the tip position of the blades in certain regions, allowing for precise cutting by adjusting the height of the guide's lower end along the rotational direction of the blades, ensuring complete mowing across the rotational locus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lower end position of the front guide plate is set at the same height as the rotating blade, then the structure is simple, but uncut grass occurs in certain regions
Solution Approach 1:
The patent applies local quality by setting different heights for different portions of the front guide plate. Specifically, the guide plate has a first portion and a second portion with different heights, where the first portion is higher than the rotating blade to prevent uncut grass in its region, while the second portion is at the same height as the blade for areas requiring standard cutting. This localized height differentiation resolves the contradiction between cutting completeness and structural simplicity.
2Manufacturing precision
If the guide plate protrudes downward to match blade height, then the guide structure is optimized, but grass passes through the rotational locus region uncut
Solution Approach 1:
The patent applies preliminary anti-action by positioning the first portion of the front guide plate higher than the rotating blade before the blade reaches the grass in the rotational locus region. This preliminary height adjustment prevents grass from entering the harmful zone where it would pass through uncut, thereby anticipating and preventing the problem before it occurs.
3Manufacturing precision
If uniform guide height is used across all regions, then the structure is simple, but grass between blades remains uncut
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through differentiated guide plate portions. The first portion extends higher than the rotating blade to address the specific problem of uncut grass between blades in certain regions, while the second portion maintains standard height. This localized adjustment provides the necessary cutting completeness without requiring complete structural redesign of the entire guide plate.
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A mower unit (2) includes: first to third rotating blades (21,22,23) and, first to third front guides (31,32,33) which are formed along each rotational locus of each blade, wherein each guide is disposed at a fore side of the rotational locus of each blade (21,22,23), and a lower end position of a part of each guide (31L-31a, 32b-32a, 33b-33a) is constructed more highly than a tip position of each blade, the part of each guide corresponding to a first region that is a part of the rotational locus, which exists within such a range from a position where a tip of each blade moves in a progressing direction of the mower unit, to another position where the tip moves in an orthogonal direction which intersects orthogonally with the progressing direction of the mower unit, and each guide is constructed so that a height of the lower end position of the part of each guide becomes low gradually along a rotational direction of each blade.