GEAR MEASURING DIAMETER OF ARTICLES Russian patent published in 1999 - IPC

FIELD: instrumentation, measurement of diameter of various articles. SUBSTANCE: gear can be used to measure diameter of tires of wheeled vehicles, fore example. Gear incorporates pickup of number of revolutions and path transducer connected to proper pulse formers. Diameter of article is coarsely determined by computation of length between two adjacent command pulses of pickup of number of revolutions by first counter of measurement pulses of path transducer. More precisely diameter of article is found by computation of length between command pulse of start of revolution of article and first measurement pulse by second counter of pulses of reference frequency generator. Third counter computes number of pulses of reference frequency generator between first and second measurement pulses. Gear makes it possible to increase measurement precision thanks to determination of angle of turn of measurement roller at start of complete revolution of article caused by incompatibility of command and measurement pulses. EFFECT: increased measurement precision. 3 dwg