| 摘要 |
PROBLEM TO BE SOLVED: To provide a minor diameter measuring device capable of acquiring accurate measurement results by performing correction operation at every measurement, even when minor diameter measurement is performed in the shape of total number inspection on a production line. SOLUTION: The minor diameter measuring device includes a table 9 on which an inner ring 2 having a through-hole 5 is arranged, a measuring head 6 of an air micrometer which is inserted into the through-hole 5 of the inner ring 2 arranged on the table 9, and a reference device 10 located above the inner ring 2 arranged on the table 9. The reference device 10 has a through-hole 18 for calibration. Moreover, the measuring head 6 having nozzle orifices 16 for jetting air out, is driven so as to reciprocate between a calibration position at the top where the nozzle orifices 16 are positioned in the through-hole 18 of the reference device 10, and a measuring position at the bottom where the nozzle orifices 16 are positioned in the through-hole 5 of the inner ring 2. COPYRIGHT: (C)2010,JPO&INPIT
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