| 摘要 |
PURPOSE:To give a servo motor a good rising characteristic and perform proper speed control of a scanner by changing over the servo loop between the time the scanner in advance rising and the time with equal speed scanning, and performing it with the address of the scanner which is predetermined with the target speed of the servo motor. CONSTITUTION:The speed of a scanner is larger at equal size duplication than at the time of enlarged duplication, and greater in contractive copying than in equal size copying. Accordingly the acceleration of scanner when it is rising, a2, is larger at equal size duplication than the acceleration a1, at enlarged duplication, and the one a3 at the time of contractive duplication must further be enlarged. Therefore, a servo control device performs changing-cover between the servo loop gain during constant speed operation in advancing and the servo loop gain during the advance rising where the responsiveness of the system is enhanced by enlarging the gain of the servo loop, and this is conducted with the address of the scanner predetermined with the target speed for DC servo motor in a certain time in advancing. This accomplishes smooth operation of the scanner. |
