| 摘要 |
PURPOSE:To perform accelerating control of a stepping motor in accordance with a physical quantity of making a change in a motor load of document size, recording mode, etc. CONSTITUTION:When document size information detected by a width sensor, length sensor, etc., is input (S100), a document size is judged for whether large or small (S101), to set an acceleration characteristic A for the large size (S102), and a time required for an operating frequency of a stepping motor to reach a stationary region is lengthened, to drive the motor (S104). An acceleration characteristic B is set for the small size (S103), and a time required for the operating frequency of the stepping motor to reach the stationary region is shortened, to drive the motor (S104). That is, in the case of the large size, by starting conveying a document at small acceleration, a step-out in a high load by the large size can be prevented. In the case of the small size, the document is conveyed at large acceleration from starting conveying the document, and a system speed is increased to enhance the productivity. |
