Image forming device and transfer belt having contact-type electricity feeding means

An image forming device comprising:

• an image carrier;
• and
• a transfer material adsorbing and conveying means for attaching a transfer material by an electrostatic force and for conveying in a direction of movement the transfer material to a position in which said image carrier forms a transfer nip with said transfer material adsorbing and conveying means, said transfer material adsorbing and conveying means comprising,
• electrical field generating means for generating an electrical field downstream of the transfer nip with respect to the direction of movement, said electrical field generating means being arranged on a side of said transfer material adsorbing and conveying means opposite to a surface in contact with the transfer material on said transfer material adsorbing and conveying means and said electrical field generating means comprising a contact-type electricity feeding means,
• an insulating layer having a volume resistivity of at least 10.sup.14 .OMEGA. cm arranged on the side of the surface of said transfer material adsorbing and conveying means in contact with said image carrier, and
• a high resistance layer having a volume resistivity of between 10.sup.8 to 10.sup.14 .OMEGA. cm disposed on the opposite side of said transfer material adsorbing and conveying means,
• wherein a surface potential of the side of said transfer material adsorbing and conveying means in contact with the transfer material resulting from said electrical field generating means forms a potential gradient having a peak proximate to a position downstream of the transfer nip with respect to the direction of movement.