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[0007] Image quality degradation occurs due to inability to prevent retransfer and scattering
Method used
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Embodiment approach 1
[0044] FIG. 1 shows an image forming apparatus according to Embodiment 1 as an example of the image forming apparatus of the present invention. The image forming apparatus shown in the figure is an electrophotographic image forming apparatus using an intermediate transfer belt (intermediate transfer body) 51 as a transfer medium. There are also processing units of 6 colors, that is, from upstream to downstream along the rotation direction of the intermediate transfer belt 51 (moving direction: direction of arrow 51), in order: a first processing unit Pa, a second processing unit Pb , the third processing unit Pc, the fourth processing unit Pd, the fifth processing unit Pe, and the sixth processing unit Pf.
[0045] In this embodiment, in the order of the first to sixth processing units Pa to Pf, black (K), dark cyan (CH), dark magenta (MH), light cyan (CL), light magenta ( ML), yellow (Y) toner image processing unit. Each of the processing units Pa, Pb, Pc, Pd, Pe, and Pf ha...
Embodiment approach 2
[0079] The image forming apparatus according to this embodiment is different from the image forming apparatus shown in Embodiment 1 (see FIG. 1 ) above, except that the arrangement order of the processing units along the rotation direction of the intermediate transfer belt 51 is different as shown in FIG. 6 . The devices have the same structure. Therefore, details of the configuration and operation of the image forming apparatus are omitted.
[0080] In this embodiment, when an image is formed using four colors of yellow, rich magenta, dark cyan, and black, which are used to form a general four-color full-color image, or when an image is formed only in black, the arrangement can make the printing from the start of operation to the end of printing The time is shortened to the shortest processing unit.
[0081] In the present embodiment, as shown in FIG. 6 , from the first to sixth processing units Pa to Pf sequentially arranged upstream in the direction of rotation of the inte...
Embodiment approach 3
[0088] In the image forming apparatus according to the embodiment of the present invention, as shown in FIG. 8, push-up members 61a, 61b, 61c, which is different from the image forming apparatus shown in FIG. 1 of Embodiment 1 above. That is, instead of changing the position of the primary transfer roller 5 as a condition of the transfer member, the push-up members 61a, 61b, and 61c are provided as described above.
[0089] The image forming apparatus shown in FIG. 8 has six process units (first to sixth process units Pa to Pf) sequentially from the upstream along the rotation direction of the intermediate transfer belt 51 as in the first embodiment. These first to sixth processing units Pa to Pf are, in this order, processing units of black, dark cyan, dark magenta, light cyan, light magenta, and yellow. The processing units Pa, Pb, and Pc of low-brightness black, dark cyan, and dark magenta include push-up rollers 61a, 61b, and 61c upstream of primary transfer rollers 5a, 5...
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Abstract
The present invention provides an image forming apparatus in which re-transferring and scattering can be prevented when a toner image on an image bearing member is repetitively transferred to a transferring medium, thereby preventing the lowering of the quality of image, and for this purpose, the image forming apparatus according to the present invention is provided with: an image bearing member; electrostatic image forming means for forming an electrostatic image on the image bearing member; developing means having toners differing in brightness and for developing the electrostatic image to thereby form a toner image; a transferring medium contacting with the image bearing member and moved in a predetermined direction, and to which a plurality of toner images differing in brightness are transferred; a transfer member for imparting charges to a rear surface opposite to a surface of the transferring medium to which the toner images are transferred, by a bias being applied thereto, and transferring the toner image on the image bearing member to the transferring medium; and bias applying means for applying a bias to the transfer member while transfer by the transfer member is effected; wherein the set condition of the transfer member differs in conformity with the brightness of the toner of the toner image the transfer member transfers.
Description
technical field [0001] The present invention relates to an image forming apparatus in which a toner image on an image carrier is repeatedly transferred to a transfer medium, capable of preventing image quality degradation when the toner image is transferred to the transfer medium. Background technique [0002] When the toner image on the image carrier is repeatedly transferred to the transfer medium, such as Figure 18 As shown, there is a problem of generating so-called "retransfer", that is, the toner that is transferred onto the transfer medium 51 from the image carrier 1a upstream in the moving direction (arrow R51) of the transfer medium 51 The image is transferred to the image carrier 1b when the toner image on the downstream image carrier 1b is transferred to the transfer medium 51 . Due to the occurrence of retransfer, an image with a desired density cannot be obtained, and the image quality will be lowered. [0003] In the past, in order to solve this retransfer pr...
Claims
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