Importance

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Abstract

In a dynamic balancing machine for measuring amount and angular location of unbalance of a rotor piece during rotating the rotor piece by a drive motor, in order to position automatically the unbalance angular location to a predetermined angular position on bearings at a time of detection of the unbalance, a preset counter is used for providing a signal to stop the drive motor. Angular pulses each of which indicates rotation of the test rotor piece over a unit angular extent are generated by a rotary encoder, and phase indicating pulses are formed from the vibration signal from a vibration velocity pickup. After constant rotation of the drive motor, motor speed is reduced by a motor speed reduction signal, and, thereafter, the preset counter begins to count the angular pulses in response to presence of one pulse of the phase indicating pulses. When the preset counter counts up to a number preset therein, the drive motor stops, then the unbalance location is positioned to an angular position which is determined by the number in the preset counter and the unit angular extent. An automatic marking device is fixedly disposed at the predetermined stop angular position and is driven after the motor stops. Thus, it is correctly and automatically performed to mark the unbalance location onto the test rotor piece.

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First Claim