Patent ID: 7907881

Claim:
A transfer-fixing device for transferring a toner image to a transfer material and fixing the toner image on the transfer material, the transfer-fixing device comprising: an image carrier configured to carry the toner image; a pressing member configured to press against the image carrier to form a transfer-fixing nip between the pressing member and the image carrier; a heater configured to heat the toner image carried by the image carrier so that a temperature of the toner image is not higher than 75 degrees centigrade, a toner softening point is 75 degrees centigrade, and a toner melting start temperature is 100 degrees centigrade; an electrical field generator configured to form a transfer electrical field at the transfer-fixing nip; and a registration roller pair configured to send the transfer material to the transfer-fixing nip when a leading edge of the toner image on the image carrier reaches a predetermined position on the transfer material; and a preheater formed in the roller registration pair and configured to preheat the transfer material before the transfer material enters the transfer-fixing nip.