Patent ID: 9146490
Filing Date: 2015-09-29
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first image bearing member for bearing a toner image; a second image bearing member for bearing a toner image; an intermediary transfer member onto which the toner images formed on said first and second image bearing members are capable of being primary-transferred, wherein said first and second image bearing members are provided along a movement direction of said intermediary transfer member; a secondary transfer member for transferring the toner images from said intermediary transfer member onto a recording material; a toner charging member, provided downstream of said secondary transfer member and upstream of the upstreammost image bearing member with respect to the movement direction of said intermediary transfer member, capable of electrically charging a toner transferred on said intermediary transfer member; and a controller for controlling an operation in a single-color image forming mode in which the toner image formed on said first image bearing member is transferred onto said intermediary transfer member to effect image formation in a state of contact between said first image bearing member and said intermediary transfer member and in a state of separation between said second image bearing member and said intermediary transfer member and for controlling an operation in a multi-color image forming mode in which the toner images formed on said first and second image bearing members are transferred onto said intermediary transfer member to effect image formation in a state of contact between said first image bearing member and said intermediary transfer member and in a state of contact between said second image bearing member and said intermediary transfer member, wherein said controller effects, in a post-processing operation after the image formation in the operation in the single-color image forming mode is ended, control such that the state of separation between said second image bearing member and said intermediary transfer member is switched to the state of contact between said second image bearing member and said intermediary transfer member and the toner deposited on said toner charging member is collected onto said second image bearing member via said intermediary transfer member and then is collected by a cleaning device provided for said second image bearing member.