News editors obtained the following quote from the background information suppli ed by the inventors: “As an unmanned self-driving robotic lawn mower, a robotic lawn mower described in Patent Literature 1 below has been known.This robotic l awn mower includes a movable machine body and lawn mowing work units, which are provided inside a casing being open on a bottom.The lawn mowing work units are disposed on a center part of the movable machine body, specifically, between fro nt wheels and rear wheels, which are moving devices.The robotic lawn mower mows a lawn in a field to a predetermined consistent height with use of cutting blad es of the lawn mowing work units while automatically performing unmanned driving using the wheels of the movable machine body through the field.The lawn mowing work units are mounted so that their height in an up-and-down direction is adju stable with respect to the movable machine body.Thus, a lawn mowing height can be appropriately set by adjusting the height of the lawn mowing work units in th e up-and-down direction with respect to the movable machine body.”
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