Lawn Mower Robot Blade Height Display Beyond 360° Scale Limits
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Solution Overview
Problem
Existing lawn mower robots have limitations in displaying the height of blades, as the scale indicating the height is restricted to a range of 0° to 360°, making it difficult to accurately display heights exceeding 60 mm.
Innovation Solution
A lawn mower robot with a flexible ruler and display window system, where the ruler is mounted on an elevating frame and can move up and down, allowing the display of blade height in a wider range (2 cm to 9 cm) without being limited by the rotation of the height adjustment knob, enabling visualization of the height through a display window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a scale is displayed on the height adjustment lever along the circumferential direction (0° to 360°), then the user can recognize the height of the blades within a limited range (20 mm to 60 mm), but the height display range is restricted and cannot display heights exceeding 60 mm
Solution Approach 1:
The patent transitions from a circular scale (2D circumferential display) to a linear ruler scale (1D linear display). The ruler is coupled to the elevating frame and moves vertically in the same dimension as the blade height adjustment, allowing the scale to extend beyond the 360° rotation limit and display heights from 2 cm to 9 cm or more without wrapping around.
Solution Approach 2:
The ruler is made movable rather than fixed, coupling it to the elevating frame so that the ruler moves up and down together with the frame. This dynamic positioning allows the ruler to maintain alignment with the blade height throughout the adjustment range, enabling continuous display of heights beyond the static circular scale's 60 mm limitation.
2Loss of information
If the height adjustment lever rotates within 360°, then the structure remains simple, but the blade height cannot be accurately displayed beyond 60 mm
Solution Approach 1:
The ruler acts as an intermediary element between the elevating frame and the user. Instead of directly reading the rotation angle of the height adjustment lever, the user observes the position of the ruler relative to the display window. The ruler translates the mechanical movement of the elevating frame into a readable height measurement, preserving accurate height information for ranges exceeding 60 mm.
Solution Approach 2:
The display system moves from angular measurement (circumferential direction) to linear measurement (vertical direction). The ruler extends vertically to indicate heights beyond 60 mm, and the display window is positioned to show the relevant portion of the ruler, allowing users to read heights in the 2 cm to 9 cm range or higher without the information loss inherent in circular scale wrapping.
3Measurement precision
If a fixed circular scale is used on the height adjustment lever, then the manufacturing is simple, but the blade height display is limited to a narrow range
Solution Approach 1:
The ruler is coupled to the elevating frame through a mounting structure that allows vertical movement. As the elevating frame moves up and down to adjust blade height, the ruler moves with it, maintaining a constant visual relationship with the display window. This dynamic coupling enables the measurement system to adapt to the full range of blade heights (2 cm to 9 cm or more) while maintaining measurement accuracy throughout the adjustment range.
Data Source
AI summary
A lawn mower robot includes: an outer cover; an inner body accommodated inside the outer cover and having a plurality of wheels on both side surfaces for traveling; a rotating plate rotatably mounted on a bottom surface of the inner body; a plurality of blades rotatably mounted on the rotating plate to cut grass; a height adjustment unit to adjust height of the blades; and a height display unit to display the blade height, wherein the height display unit includes: an inner cover mounted on an upper portion of the outer cover; a display window formed through one side of the inner cover; and a ruler having numerals on an upper surface to display the height of the blades, and mounted inside the inner body to be movable up and down and back and forth in correspondence to movement of the height adjustment unit.