SHAPE MEASURING APPARATUS

Japanese Patent JPH03140813

A

PURPOSE:To achieve a higher reliability by forbidding the storing of a surface position data by a distance signal detected when a detection signal of a distance sensor is abnormal to move the distance sensor by one pitch in a tangential way orthogonal to a preceding direction of normal. CONSTITUTION:This apparatus is provided with an abnormality detecting means 507 which judges whether an output of a distance sensor 501 is abnormal or not and outputs an abnormality signal when it is abnormal and a forbidding means 508 which forbids the writing of a surface position data computed currently into a memory means 506 when the abnormality signal is outputted. When no abnormality signal is outputted, a direction of detection with the sensor 501 is turned to a direction of normal computed currently while a distance between an object W to be detected and the sensor 501 is set to a target value and a driver 504 is controlled so that the sensor 501 is moved by one pitch in a tangential way along an X axis orthogonal to the direction of normal. When the detection signal of the sensor 501 is abnormal, the storing of the surface position data by a distance signal detected is forbidden 508 and the sensor 501 is moved by one pitch in a tangential way orthogonal to a preceding direction of normal to the subsequent measuring point.

NAKAJIMA YOSHIO
HONMA KAZUO
SUMIYA YUKIO
YAMAGUCHI TAKESHI
INAMITSU HIROSHI
MINAMIYAMA EIJI

JP28015789A

June 14, 1991

October 27, 1989

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HITACHI CONSTRUCTION MACHINERY

G01B21/20; G01B11/24; G01B11/245; G01B21/00; G01N29/22; G01N29/44; (IPC1-7): G01B21/20; G01N29/22

Fuyuki Nagai

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