Abstract:
PROBLEM TO BE SOLVED: To provide a transfer device that forms a secondary transfer nip part, the transfer device suppressing image quality failure such as void generated by foreign substances being attached to a surface of a drive roller 142 for driving an intermediate transfer belt 141.SOLUTION: An alumite layer 142b provided on a surface of a drive roller 142 generates an electrostatic adhesion force when a transfer bias is applied between the drive roller 142 and an intermediate transfer belt 141. The electrostatic adhesion force allows stable transmission of a rotation driving force from the drive roller 142 to the intermediate transfer belt 141. When the transfer bias is turned off, the electrostatic adhesion force is not generated, thereby improving cleaning performance of a blade 201 for removing foreign substances adhered to the surface of the drive roller 142.
Abstract:
PROBLEM TO BE SOLVED: To prevent an increase in costs, and a reduction in paper conveyability and durability, and suppress the occurrence of white images or roughened images to provide excellent images.SOLUTION: An intermediate transfer belt 5 is provided on which a toner image formed on an image carrier is transferred and temporarily held. The intermediate transfer belt 5 includes a base material 26, an elastic layer 27 that is formed laminated on the base material 26, and a surface layer 28 that covers the elastic layer; and the volume resistivity of the surface layer 28 is lower than the volume resistivity of the belt as a whole.
Abstract:
PROBLEM TO BE SOLVED: To suppress, in a transfer device having a driving roller that drives an intermediate transfer belt and forms a transfer nip part, image quality defects such as white streaks occurring due to foreign substances being attached to the surface of the driving roller.SOLUTION: When an alumite layer 142b provided on the surface of a driving roller 142 is applied with transfer bias, generates an electrostatic adhesion force between the driving roller 142 and an intermediate transfer belt 141. The electrostatic adhesion force stably transmits a rotation driving force from the driving roller 142 to the intermediate transfer belt 141. A roll cleaner 200 cleans the driving roller 142.
Abstract:
PROBLEM TO BE SOLVED: To suppress, in a transfer device including a driving roller that drives an intermediate transfer belt and forms a transfer nip part, image defects such as white streaks occurring due to foreign matters attached to the surface of the driving roller.SOLUTION: An alumite layer 142b provided on the surface of a driving roller 142 generates, when applied with a transfer bias, electrostatic adhesion force between the driving roller 142 and an intermediate transfer belt 141. With the electrostatic adhesion force, a rotation driving force is stably transmitted from the driving roller 142 to the intermediate transfer belt 141. When the electrostatic adhesion force is not generated, a blade 201 achieves improved cleaning performance of removing foreign matters attached to the surface of the driving roller 142.
Abstract:
PROBLEM TO BE SOLVED: To provide an image forming apparatus which is capable of obtaining an excellent image by enabling an intermediate transfer belt to stably travel, with a simple configuration.SOLUTION: An image forming apparatus 1 includes an intermediate transfer belt 17 which is stretched in a travelable manner on a plurality of rollers including a driving roller 25 and to which a toner image formed on photoreceptors 11a to 11d is primarily transferred and a secondary transfer roller 34 transferring the toner image primarily transferred to the intermediate transfer belt 17 to a paper P. The intermediate transfer belt 17 is configured by laminating an elastic layer 17b on a base material layer 17a. The surface layer part 25b of the driving roller 25 is made of a rubber material and the driving roller 25 makes the intermediate transfer belt 17 travel by the press-contact of the surface layer part 25b with the intermediate transfer belt 17. The secondary transfer roller 34 is rotated by the same motor 51 as the driving roller 25. The speed of the outer peripheral surface 34s of the secondary transfer roller 34 is lower than the speed of the surface of the intermediate transfer belt 17.
Abstract:
PROBLEM TO BE SOLVED: To provide a transfer device that suppresses an increase in resistance of an intermediate transfer belt in association with a long-term use, and suppresses leakage of a transfer current between adjacent transfer units as much as possible; and an image forming apparatus provided with the device.SOLUTION: Primary transfer rollers 24C and 24Y are arranged to face photoreceptor drums 20C and 20Y with an intermediate transfer belt 141 on which full-color toner images are transferred therebetween. During non-transfer operation at a primary transfer nip part NC, and transfer operation at a primary transfer nip part NY adjacent thereto, the primary transfer roller 24C receives application of a transfer bias having a reverse polarity to a polarity of a toner. Whereas, during the non-transfer operation at the primary transfer nip part NC, and non-transfer operation at the primary transfer nip part NY, the primary transfer roller 24C receives application of a transfer bias having the same polarity as the polarity of the toner.