| 摘要 |
PURPOSE:To reduce noise and vibration even when the number of revolution of a motor changes by lowering driving voltage for the motor and minimizing the torque of the motor when the number of revolution of the motor decreases. CONSTITUTION:Motor pulses 7 driving a stepping motor for feeding paper are generated by the two counter outputs of an output 4 from a block counter 2 and an output 5 from a black picture-element counter 3 by a control circuit 6, and a voltage control output 11 is outputted from the control circuit 6 when black picture elements reach a fixed value and the intervals of motor pulses 7 are lengthened to a predetermined value or more. A voltage control circuit 12 changes the voltage of a power input 13 by the voltage control output 11, and outputs motor driving voltage 14. A motor drive circuit 8 drives the stepping motor by the output of the motor pulses 7 and motor driving voltage 14. |
