| 摘要 |
A vehicular machine, such as a trencher, having working means, such as a digging wheel, carried thereon for working material to a desired grade as the machine moves along a given path. Vertical adjustment of the working means is automatically controlled by a laser guidance system mounted on the machine for movement therewith. The guidance apparatus includes a reference means, such as a shoe of a trencher, movable with the machine and which engages the surface of the material already worked to the desired grade by the machine. The guidance apparatus also includes a detector apparatus comprising a laser beam generator mounted on a stabilizing platform and a beam sensor remote therefrom but enclosed within the same housing, the housing being carried by the framwwork of the working implement of the machine. The stabilized laser is preferably located in close proximity to the reference means with the beam aimed generally in the plane of motion of the working implement relative to the machine. Deviations of the working means from the desired grade are sensed by relative motion between the beam and sensor to develop a control signal utilized by a hydraulically actuated hoisting mechanism to raise or lower the working means to thus correct for such deviations and thereby maintain the material being worked at the desired grade as the machine moves along said path.
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