IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes an image bearing member; a developing device; a transfer member; a contact member provided downstream of the transfer member and upstream of the developing device with respect to a movement direction of a surface of the image bearing member and contacting the image bearing member at a contact portion, wherein the surface of the image bearing member passed through a transfer portion reaches the contact portion without being cleaned, a detecting portion for detecting a size of the sheet; and a controller for executing an operation in a cleaning mode for cleaning the contact member. The controller executes the operation in the cleaning mode when the controller discriminates that the size of the sheet detected by the detecting portion is smaller than a size of the toner image.

主权项

1. An image forming apparatus comprising:
an image bearing member; a developing device for forming a toner image on said image bearing member by depositing toner on an electrostatic latent image formed on said image bearing member; a transfer member for transferring the toner image onto a sheet at a transfer portion; a contact member provided downstream of said transfer member and upstream of said developing device with respect to a movement direction of a surface of said image bearing member and contacting said image bearing member at a contact portion, wherein the surface of said image bearing member passed through the transfer portion reaches the contact portion without being cleaned, a detecting portion for detecting a size of the sheet; and a controller for executing an operation in a cleaning mode for cleaning said contact member, wherein said controller executes the operation in the cleaning mode when said controller discriminates that the size of the sheet detected by said detecting portion is smaller than a size of the toner image.