Abstract: There is disclosed a color image forming apparatus, which makes it possible to prevent a reproduced image from generating image defects, such as a color unevenness, a toner scattering, etc.

Abstract: The color image forming apparatus, having: an intermediate transfer member; a plurality of image forming sections provided along the intermediate transfer member; a primary transfer device provided along the intermediate transfer member to transfer toner images formed on each image forming section so that the toner images are superimposed on the intermediate transfer member; a secondary transfer device provided downstream side of the primary transfer device to transfer superimposed toner images through bias voltage; a discharging device having a grid and a discharge electrode provided between the primary transfer device and secondary transfer device; a image density sensor provided along the intermediate transfer member to detect an amount of toner adhesion on the intermediate transfer member; and a control device to control the applied voltage for the discharge electrode in accordance with output of the image density sensor.

Abstract: A color image forming apparatus includes primary transferring units that transfer toner images of different colors from photoreceptors to an intermediate transfer body, a secondary transferring unit that transfers a color toner image from the intermediate transfer body onto a transfer material, a pre-charging unit placed downstream of the primary transferring units and upstream of the secondary transferring unit and that applies electric charge to the color toner image on the intermediate transfer body before the secondary image transfer with the polarity of the applied electrical charge identical to polarity of the potential of the toner, and a potential adjustment unit placed downstream of the pre-charging unit and upstream of the secondary transferring unit, and that applies an electric charge that has a polarity opposite to that of the potential of the toner to the color toner image on the intermediate transfer body.

Abstract: There is described an image forming apparatus, which makes it possible to conduct a sufficient discharging operation for a toner image. The apparatus includes an image forming section, an image bearing member, an intermediate transfer belt, a part of which is supported in a state of a flat plane by supporting members, a primary transferring device to transfer a toner image from the image bearing member onto the intermediate transfer member, a secondary transferring device to transfer the toner image onto a transfer material, a scorotron discharging device that is disposed at an upstream side of the secondary transferring device, where the part of the intermediate transfer member is supported in the state of the flat plane, and includes a discharging electrode and a grid to discharge the toner image; and a conductive brush that opposes to the scorotron discharging device and contacts the rear surface of intermediate transfer member.

Abstract: A color image forming apparatus includes plural developing units that respectively form toner images of different colors on plural photoreceptors, plural primary transferring devices that successively transfer each of the toner images of the plural photoreceptors onto an intermediate transfer belt, which holds a color toner image transferred and superimposed by primary transfer, a secondary transferring device that transfers concurrently the color toner image onto a transfer material, a drive roller that drives the intermediate transfer belt and that is placed between one of the plurality of primary transferring devices which is arranged on the most downstream side in the direction of movement of the intermediate transfer belt and the secondary transferring device, and a controller that controls a discharger discharging the color toner image and the drive of the drive roller.

Abstract: A color image forming apparatus is described, which makes highly durable image transferring possible.