Patent ID: 8577268

Claim:
An image forming apparatus comprising: an image bearing member for bearing a toner image; a conveying belt, which is opposed to the image bearing member, for bearing and conveying a transfer material; a transfer portion, which is opposed to the conveying belt, for electrostatically transferring the toner image to the transfer material conveyed by the conveying belt; an attraction roller, configured to electrostatically charge the transfer material to be attracted to the conveying belt and to be disposed upstream of the transfer portion in a conveying direction of the transfer material, and to have an outer diameter on a central section which is smaller than an outer diameter on an end section in the width direction which intersects with the conveying direction; a voltage applying portion configured to apply a voltage to the attraction roller; and a winding roller, configured to be disposed adjacent and downstream of the transfer portion in the conveying direction of the transfer material, to wind the conveying belt, and to have an outer diameter on a central section which is larger than an outer diameter on an end section in the width direction which intersects with the conveying direction, wherein a contact amount between the attraction roller and the conveying belt on the end section is larger than a contact amount between the attraction roller and the conveying belt on the central section, and wherein a contact amount between the winding roller and the conveying belt on the end section is smaller than a contact amount between the winding roller and the conveying belt on the central section.