Patent ID: 8774689
Filing Date: 2014-07-08
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image carrier configured to carry a toner image; a movable belt member configured to convey a recording material; a transfer member configured to electrostatically transfer the toner image formed on the image carrier to the recording material conveyed by the belt member; a boost unit having a plurality of protrusions in a width direction of the belt member orthogonal to a conveying direction of the belt member and configured to push the belt member from an inner side of the belt member downstream of the transfer member in a conveying direction of the recording material so that the plurality of protrusions form a plurality of protruded portions on the belt member in a thickness direction of the belt member; and a control portion configured to set a smaller interval between adjacent protrusions in the width direction when the belt member conveys a recording material of a first size in the width direction than an interval between the adjacent protrusions in the width direction when the belt member conveys a recording material of a second size larger than the first size.