Heating and fixing device for toner image

摘要

A fixing device in which a toner image support member is pressure-held between and conveyed by a pair of rollers at least one of which is heated to a temperature at which the toner image may be fixed on the support member, characterized in that the end of at least one of the rollers which tends to be higher in temperature is cooled or the opposite end of said at least one roller is supplied with heat, whereby the thermally expanded state of said at least one roller and the thermally expanded state of the other roller are maintained in such a condition that the toner image support member is not laterally displaced from a predetermined conveyance path.