초록 ▼

A beam receiver secured to an upper portion of a blade of an earth working equipment can rotate in a horizontal plane and move in a vertical direction and, accordingly, can catch a laser beam from a beam projector regardless of a direction of the equipment. When the beam has been deviated out of the

A beam receiver secured to an upper portion of a blade of an earth working equipment can rotate in a horizontal plane and move in a vertical direction and, accordingly, can catch a laser beam from a beam projector regardless of a direction of the equipment. When the beam has been deviated out of the beam receiver, the direction of the deviation is detected so that the beam can be received by the beam receiver again. The height of the beam receiver relative to the blade can be adjusted and the level of the blade can thereby be controlled very accurately.

대표청구항 ▼

An automatic control system for maintaining the blade of an earthworking device in a predetermined vertical relationship to a reference laser beam, said system comprising: a beam receiver coupled to the blade, said beam receiver providing a beam detection signal corresponding to a vertical position

An automatic control system for maintaining the blade of an earthworking device in a predetermined vertical relationship to a reference laser beam, said system comprising: a beam receiver coupled to the blade, said beam receiver providing a beam detection signal corresponding to a vertical position on the beam receiver at which the reference laser beam is received and to an incident angle of the reference laser beam, wherein said beam receiver includes at least two beam receiving element groups angled outwardly with respect to each other; main control means for controlling the position of the blade in response to said beam detection signal so that the vertical position at which the laser beam is received will correspond to a preset position; automatic tracing means for controlling the turning of the beam receiver in response to the beam detection signal to thereby control the direction of the beam receiver, wherein said automatic tracing means comprises a logical circuit which can receive a first signal from one of said beam receiving element groups and a second signal from the other of said beam receiving element groups and delivers no output when it has received both the first and second signals, a right turn signal when it has received the first signal only and a left turn signal when it has received the second signal only; beam deviation means for detecting an upward or downward deviation of the beam receiver with respect to the laser beam; and blade control means for moving the blade upward when the beam receiver has deviated downwardly with respect to the laser beam and downward when the beam receiver has deviated upwardly with respect to the laser beam, to thereby enable the beam receiver to receive the laser beam again.