| 摘要 |
PURPOSE:To shorten a machine change-over time to a large extent and to easily keep measuring accuracy, by mounting air holes for two kinds of machines provided to a center shaft so as to provide an internal up and down and a mechanism for changing over an air route up and down. CONSTITUTION:Air holes 3, 4 are opened to a center shaft 2 at the positions matching with the heights of the bearing parts 7, 8 of rotary body products 11, 12 being objects to be measured. Slits 13 are provided to the shaft 2 as the air routes to the air holes 3, 4 and, in order to change over the air routes, a change-over pin 5 is rotated by 30 deg. with a driver to match the positions of the slits 13 with the air holes 3 or 4. The rotary body products 11, 12 being the objects to be measured are supported on a receiving stand 1, and positioned and held in such a state that the center shaft 2 and a rotation stopper pin 9 are inserted in the products so that the clearances of the bearing parts 7, 8 to the center shaft 2 become uniform by the high pressure air blown out from the air holes 3, 4 and unbalance quantity is measured by a balancer measuring part 10.
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