| 摘要 |
PURPOSE:To eliminate the mixture of toner and to prolong the period of maintenance by providing two front and rear photosensitive bodies with image formation parts, development parts, and transfer parts at their peripheries, and using toner particles of different colors for the development parts. CONSTITUTION:The two front and rear photosensitive bodies 51 and 61 are installed and a printing form 57 is fed by paper feeding mechanisms 52 and 62 as shown by an arrow A. The photosensitive bodies 51 and 61 have dedicated cleaning mechanisms 52 and 62, high-voltage electrostatic charging mechanisms 53 and 63, scanning mechanisms 54 and 56, magnetic brushes 55 and 56, and image transfer parts 58 and 67. Semiconductor lasers 55 and 65 drive the scanning mechanisms 54 and 64 under the control of a logical part 60 to form electrostatic latent image on the printing form 57 without any position deviation, and the images are visualized with toner particles of different colors by the brush mechanisms 56 and 57, transferred 58 and 67, and fixed lastly by a fixing part 69 on a two-color simultaneous basis. Consequently, the mixture of toner particles of two colors is prevented, the period of maintenance is prolonged, and a development part is easily replaced. |
