Image forming apparatus with intermediate toner transfer medium, control method therefor, and storage medium storing control program therefor

摘要

An image forming apparatus that is capable of reducing velocity fluctuation due to variation of friction torque between an image bearing member and an intermediate transfer medium depending on a toner image. An exposure unit forms a latent image on the image bearing member rotated by a first drive unit. A development unit develops the latent image to form a toner image. A primary transfer unit transfers the toner image to an intermediate transfer medium rotated by a second drive unit. A secondary transfer unit transfers the toner image to a sheet. A control unit controls the drive units so that a peripheral velocity difference between the image bearing member and the intermediate transfer medium becomes a first value at starting, and controls so that the peripheral velocity difference becomes a second value larger than the first value when minute toner reaches the position of the primary transfer unit.

主权项

1. An image forming apparatus comprising:
an exposure unit configured to form a latent image on an image bearing member; a development unit configured to develop the latent image to form a toner image; a primary transfer unit configured to transfer the toner image formed on the image bearing member to an intermediate transfer medium; a secondary transfer unit configured to transfer the toner image transferred to the intermediate transfer medium to a sheet; a first drive unit configured to rotate the image bearing member; a second drive unit configured to rotate the intermediate transfer medium; and a control unit configured to control said first and second drive units so that a peripheral velocity difference between the image bearing member and the intermediate transfer medium becomes a first value when driving of said first and second drive units is started, and configured to control said first and second drive units so that the peripheral velocity difference becomes a second value larger than the first value when toner, which is adhered to the image bearing member by said development unit being operated, reaches the position of said primary transfer unit.