| 摘要 |
PURPOSE:To eliminate a shift in image position and to obtain an excellent image by moving plural developing devices which are arranged at the periphery of a photosensitive body by a moving means selectively between development operation positions and development nonoperation positions. CONSTITUTION:Either of developing devices 3 and 4 is selected and the developing roller 3a or 4a of the selected device is brought into contact with the photosensitive body 1 to develop, transfer, and fix an electrostatic latent image on the photosensitive body. The anchor 27 of the device is linked to the anchor 33 of eccentric rollers 8 and 9 by a spring 28, and a roller 8 is rotated clockwise around a center 25 by the clockwise rotation of a motor; and the motor is stopped when a point 33 comes to above the line l connecting the anchor 27 and center 25, and the developing device is rotated around centers 29 and 30 of rotation with the force of the spring 28 to bring either of the rollers 3a and 4a into contact with the photosensitive body. Therefore, the movement of the developing device and the rotation to and stop at the developing roller are not performed in an exposing process and a transfer process, so an excellent image having no shift is obtained. |
