Abstract: A heat-fixing apparatus includes a heating roll constituted by a cylindrical core coated with a heat-resistant, elastic layer and a resin surface layer having release properties, which is to be brought into contact with a toner inage-bearing sheet member; a pressure roll in pressed contact with said heating roll to provide a nip portion therebetween; a cleaning roll made of a metal material and rotatably pressed to said heating roll; and a scraper in slidable contact with the outer surface of said cleaning roll. The scraper includes a scraper element held between a support plate and a spaced holding plate by screws extending through longitudinally enlarged holes in the scraper element, to prevent thermal expansion-induced deformation of the scraper element.

Abstract: A heat-fixing apparatus comprising a heating roll to be brought into contact with a toner image borne on a sheet member, a pressure roll in pressed contact with the heating roll to provide a nip portion therebetween, each of the heating roll and the pressure roll being constituted by a cylindrical core coated with a heat-resistant, resilient layer and a resin surface layer having release properties, the heating roll and the pressure roll having such surface hardness as to make the nip portion substantially flat and also having substantially the same outer diameter, and the contact pressure of the rolls being such that the nip portion has a width within the range of providing good fixing capability. This heat-fixing apparatus can perform toner image fixing even on sheet members of a plurality of plies such as envelopes without creasing.

Abstract: A heat-fixing apparatus comprising a heating roll to be brought into contact with a toner image borne on a sheet member, a pressure roll in pressed contact with the heating roll to provide a nip portion therebetween, each of the heating roll and the pressure roll being constituted by a cylindrical core coated with a heat-resistant, resilient layer and a resin surface layer having release properties, the heating roll and the pressure roll having such surface hardness as to make the nip portion substantially flat and also having substantially the same outer diameter, and the contact pressure of the rolls being such that the nip portion has a width within the range of providing good fixing capability. This heat-fixing apparatus can perform toner image fixing even on sheet members of a plurality of plies such as envelopes without creasing.