APPARATUS FOR MEASURING DIAMETER OF OBJECT BY CIRCUMFERENCE MEASUREMENT AND METHOD FOR CONTROLLING SIZE OF WORKPIECE

摘要

PROBLEM TO BE SOLVED: To measure a diameter of an object to be measured without being affected by a roundness shape of a workpiece and correctly stably manage a size of the workpiece by bringing a measurement element into touch with the object at respective outer circumferences and operating from a rotation angle of the measurement element measures after rotating once the object. ;SOLUTION: A turning arm 5 and a turning servo motor 18 are set concentrically at a leading end of a lift arm 4. A measurement element arm 6 is also set at the leasing end of the lift arm, which has a turn axis in parallel to a turn center of the turning arm 5. A rotation angle detection servo motor 21 is mounted at the measurement element arm 6. A rotation angle of a measurement element 3 kept in touch with an object 7 to be measured is measured when the turning arm 5 is held stationary and a circular table 1 rotates by 360° or when the circular table 1 is held stationary and the turning arm 5 rotates by 360°. Data of the measured rotation angle are input to an operation circuit. Data of a diameter of the circumferential object are operated from the input rotation angle data and data stored in a memory circuit beforehand, and output.;COPYRIGHT: (C)1999,JPO