Patent ID: 8180247

Claim:
An image forming apparatus comprising: a plurality of image bearing members each of which bears a toner image; an endless intermediate transfer member which is rotatable; and a charge member that charges toner adhered on said endless intermediate transfer member, wherein a toner image is primary-transferred from only a predetermined image bearing member among said plurality of image bearing members to said endless intermediate transfer member in a mono-color mode or a toner image is primary-transferred from all of said plurality of image bearing members to said endless intermediate transfer member in a full-color mode, wherein in the mono-color mode, the adhered toner charged by said charge member moves to the predetermined image bearing member so that the adhered toner is collected from said endless intermediate transfer member, and wherein in the full-color mode, the adhered toner charged by said charge member moves to image bearing members among said plurality of image bearing members except the predetermined image bearing member so that the adhered toner is collected from said endless intermediate transfer member.