JP2010060945A5 - - Google Patents

Description

The above object is achieved by the image forming apparatus according to the present invention. In summary, the present invention includes an image bearing member for bearing a toner image, has an intermediate transfer member movable, the toner image on the image bearing member onto the intermediate transfer member in a primary transfer position In an image forming apparatus that performs primary transfer and secondarily transfers a toner image on the intermediate transfer member to a transfer material at a secondary transfer position.
A sheet-shaped charging member that charges toner remaining on the intermediate transfer body without being secondarily transferred to the transfer material without rotating with respect to the movement of the intermediate transfer body; The outer periphery of the sheet-like charging member is charged upstream of the rubbing portion in the moving direction of the intermediate transfer member while charging the toner remaining in the rubbing portion which is in surface contact with the intermediate transfer member and rubs against the intermediate transfer member. An image forming apparatus is characterized in that residual toner is retained on a surface .

At a position (secondary transfer position) facing the secondary transfer counter roller 12 with the intermediate transfer belt 9 interposed therebetween, a secondary for secondary transfer of the toner image from the intermediate transfer belt 9 onto the transfer material P such as paper. A secondary transfer roller 11 as a transfer means is disposed. The transfer material P fed by a paper feed roller (not shown) is supplied at a predetermined timing to the secondary transfer nip portion N2 where the intermediate transfer belt 9 and the secondary transfer roller 11 are rubbed. At the same time, a secondary transfer bias is applied from the power source 17 to the secondary transfer roller 11, and the toner image is secondarily transferred from the intermediate transfer belt 9 to the transfer material P. Residual toner that is not transferred to the transfer material P and remains on the intermediate transfer belt 9 is uniformly scattered by a conductive planar toner holding member (that is, a planar charging member) 21 serving as an intermediate transfer member cleaning unit. A charge is applied by the conductive roller 22 as a charging member, which is transferred to the photosensitive drum 1 and collected. The residual toner attached to the photosensitive drum 1 is scraped off by the cleaning blade 15.

Claims (6)

An image bearing member for bearing a toner image, has an intermediate transfer member movable, and primary transfer of the toner image on the image bearing member onto said intermediate transfer member at the primary transfer position, the intermediate transfer In an image forming apparatus for secondary transfer of a toner image on a body to a transfer material at a secondary transfer position,
A sheet-shaped charging member that charges toner remaining on the intermediate transfer body without being secondarily transferred to the transfer material without rotating with respect to the movement of the intermediate transfer body; The outer periphery of the sheet-like charging member is charged upstream of the rubbing portion in the moving direction of the intermediate transfer member while charging the toner remaining in the rubbing portion which is in surface contact with the intermediate transfer member and rubs against the intermediate transfer member. An image forming apparatus characterized by retaining residual toner on a surface . The image forming apparatus according to claim 1, wherein the residual toner on the intermediate transfer member charged by the planar charging member is transferred to the image carrier simultaneously with the primary transfer. The image forming apparatus according to claim 1, wherein the sheet charging member has a configuration in which an elastic sheet is attached to a rigid body. 4. The image forming apparatus according to claim 1, wherein a member having a curvature is used as the planar charging member , and the curved portion is rubbed on the intermediate transfer member. 5. The image forming apparatus according to claim 1, wherein the planar charging member has an uneven surface. Second charging that further charges the residual toner charged by the sheet charging member on the downstream side of the sheet charging member and on the upstream side of the primary transfer unit in the moving direction of the intermediate transfer member. 6. The image forming apparatus according to claim 1, further comprising a member.