| 摘要 |
PURPOSE:To prevent thrust load from acting upon bearings and facilitate mounting and dismounting without degrading accuracy by providing magnetism generating means to support shafts and coupling the driving shaft of a turning body to be measured to the support shafts by means of magnetic force. CONSTITUTION:A turning body 26 to be measured is supported via a spring 23 between support shafts 6 and 7. When in a freely rotating state the center of gravity G comes perpendicularly downward, the body 26 comes to a standstill. Next, a driving shaft 16 is moved leftward along a sleeve 18 and a guide groove 19 by a knob 21 to connect a permanent magnet 13 and a torque trasmission plate 9 to one body by magnetic force, thence the shaft 16 is turned to move a pin 20 in the circumferential directin of the guide groove 19 and to detain the same. The rotating torque T of a coil spring 15 is applied to the body 26 via the shaft 6, by which the body 26 is turned. The body 26 comes to a standstill at the angle at which the rotating moment owing to the static unbalance thereof and the T balance, and from the turning angle thereof, the quantity of static unbalance is calculated. Thereby, the acting of thrust load upon bearings 4, 5 is obviated, and the mounting and dismounting are facilitated without degrading the accuracy. |
