| 摘要 |
PURPOSE:To lessen the influence of the revolution variance of a main shaft motor and to permit cost reduction and space economization by approximately synchronously generating the servocontrol signal synchronized with the revolution of the main shaft motor and servocontrol signal sampling signal. CONSTITUTION:A counter circuit 2 is inputted with the signals from a reference timing signal generating circuit 1 and a sink pulse detecting circuit 3, makes setting/resetting to form the servocontrol signal sampling timing signal and inputs the same to a servocontrol signal sampling circuit 5. On the other hand, the reference timing signal of the circuit 1 is passed through a frequency dividing circuit 6 by which the signal is made into a main shaft motor control clock signal. Said signal is applied to a main shaft motor revolution control circuit 7. The revolution of the motor 8 is so controlled that the clock signal synchronizes with the output signal of a revolution detecting sensor 9 of the motor 8. The influence by the variance in the rotating speed of the motor is lessened and the cost reduction and space economization are made possible by sampling the servocontrol signal synchronized with the revolution of the motor 8 in the above-mentioned manner.
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