Colour imaging device

Abstract

In a color image forming apparatus, a looped belt member is stretched and circulated by at least a drive roller and a driven roller so as to have a tensed side and a slack side. Each of plural image supporting members supports a single color toner image thereon, and abuts onto the tensed side of the belt member to define a transferring position at which the toner image is transferred onto either the belt member or a recording medium held by the belt member, while being rotated. A circumferential velocity of each image supporting member is determined so as to be lower than a circulation velocity of the belt member. Further, a circumferential velocity of an image supporting member which is further from the driving roller may be lower than a circumferential velocity of an image supporting member which is closer to the driving roller. <IMAGE>

Description

technical field [0001] The present invention relates to a color image forming apparatus, such as a color printing machine, a color copying machine, or a color facsimile machine, which forms a color image by electrophotography. In particular, the present invention relates to a color image forming apparatus in which a plurality of toner images respectively formed of a plurality of single-color toner images are sequentially transferred to a transfer member or to a toner image held by a transfer member. on the recording medium. Background technique [0002] An image forming device, particularly a tandem image forming device using electrophotography, generally has a photoresistor serving as an image bearing member having: a photosensitive layer on its peripheral surface; Charging means; exposing means for selectively making the peripheral surface which has been uniformly charged by the charging means, thereby forming an electrostatic latent image; developing means for providing ...

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Problems solved by technology

[0015] exist Image 6 In the related art device shown, since the driving unit of the image bearing member and the driving unit of the transfer member are driven by separate driving sources, the speed V(Y, M, C and K) is greater than the speed V1 of the transfer member (intermediate transfer drum 12), so the drive structure becomes very complicated and the size of the device increases

[0016] Japanese patent NO 22686267 discloses an image forming device, which has a transmission mechanism that transmits the driving force from the image bearing member to the transfer roller, so that the peripheral speed of the transfer roller is greater than that of the image bearing member. This patent talks about forming A device for forming a monochrome image, but does not consider the problem of color misalignment for forming a full-color image

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