Patent ID: 7532967

Claim:
An excavation teaching device for a construction machine for carrying out excavation to shape a three-dimensional landform into a three-dimensional target landform having a specific grade with operation of an operating mechanism for excavation, said excavation teaching device comprising position measuring means for measuring a three-dimensional position of an operating mechanism of said construction machine, and display means for displaying a positional relationship between the three-dimensional target landform and said operating mechanism in accordance with a measured result of said position measuring means, wherein said display means displays, as an image in a first screen area, a plurality of small plane surfaces constituting the three-dimensional target landform and an illustration of the whole or a part of said construction machine including a body of said construction machine and at least a fore end portion of said operating mechanism, and said excavation teaching device automatically selects and said display means discriminatively displays in said first screen area, as a target excavation surface, one of the plurality of small plane surfaces constituting the three-dimensional target landform, which satisfies that the direction normal to the one small plane surface is parallel within a range of allowable error, to a vertical plane in which said operating mechanism operates whereby the target landform is excavated to the specific grade.