| 摘要 |
An apparatus for automatically spin checking a driven disc assembly for warpage includes a stationary ring and a movable ring. A torque motor is provided with an output shaft connected to a splined hub, upon which the driven disc assembly is mounted for rotation between the two rings. A servo motor and ball srew mechanism selectively moves the movable ring toward the stationary ring so as to frictionally engage the driven disc assembly therebetween. When so engaged, the distance separating the two rings is measured by an electronic sensor. The torque motor is then energized to exert a predetermined torque on the driven disc assembly, attempting to rotate it against the frictional force generated by the rings. Next, the movable ring is gradually moved away from the stationary ring so as to gradually reduce the frictional force exerted on the driven disc assembly. When the frictional force has decreased a sufficient amount, the driven disc assembly will begin to rotate under the urging of the torque motor. Sensors are provided for sensing this rotation and for measuring the distance separating the two rings at that time. The difference between these two distances is compared with a standard value to determine if the driven disc assembly is excessively warped.
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