Abstract: A fixing device has a heating roller and a pressure belt. Surface hardness of the pressure belt is higher than surface hardness of the heating roller. An overall length of the pressure belt is longer than an overall length of a rubber layer of the heating roller. Both ends of the pressure belt are positioned outside both ends of the rubber layer of the heating roller. Thereby, the heating roller is improved in service life, so that the fixing device as a whole is improved in service life.

Abstract: A fixing device has a presser member, a heating roller and a pressure belt. An overall length of the presser member is longer than an overall length of a rubber layer of the heating roller. Both ends of the presser member are positioned outside both ends of the rubber layer of the heating roller. An overall length of the presser member is longer than an overall length of the pressure belt. Both ends of the presser member are positioned outside both ends of the pressure belt. Thereby, the heating roller and the pressure belt are improved in service life, so that the fixing device as a whole is improved in service life.

Abstract: A fixing device has a presser member, a slide member and a pressure belt. Both ends of the presser member are positioned outside both ends of the slide member. Both ends of the slide member are positioned outside both ends of the pressure belt. Thereby, the slide member and the pressure belt are improved in service life, so that the fixing device as a whole is improved in service life.

Abstract: Fixing belt is brought into pressure-contact with the surface of fixing roller such that fixing belt rotates according to rotation of fixing roller, thereby forming, between fixing belt and fixing roller, fixing nip portion through which recording sheets pass. A pressing area of an opposing surface of pressing member contacting the surface of fixing roller via fixing belt is smaller in each end portion of the opposing surface in the axis direction of fixing roller than in a central portion of the opposing surface in the axis direction of fixing roller. This makes speed of conveying recording sheets faster in each edge portion in the width direction perpendicular to a recording sheet conveyance direction than in a central portion in the width direction. Thus, creases of recording sheets can be prevented while a recording sheet passes through fixing nip portion between fixing roller and fixing belt mutually brought into pressure-contact.

Abstract: A fixing device of the present invention includes a holding frame placed along a fixed pressing member. The holding frame includes a groove section having a recessed cross section and extending along the width direction of a sheet. The fixed pressing member is housed in the groove section. The fixed pressing member is pressed toward the rotor so that the rotor and the fixed pressing member are put in pressure contact with each other. A first engaging element is provided in a predetermined position on the bottom face of the groove section of the holding frame. A second engaging element which engages with the first engaging element is provided in a position on the fixed pressing member which corresponds to the positions of the first engaging element on the holding frame.

Abstract: An image forming apparatus includes a fixing device in which a width of a slide member is larger than a width of a pressurizing belt while both ends of the slide member are positioned outside of both ends of the pressurizing belt. The above-structured slide member makes it possible to prevent lubricant on the slide member from leaking out of the ends of the slide member and coming around the inner surface of the slide member, and thereby to prevent a pressing member beneath the slide member from swelling, resulting in avoidance of wrinkle generation on recording materials.

Abstract: A fixing device has a heating roller and a pressure belt, each of which includes a gripping portion at both width-directional ends thereof. The gripping portion corresponds to outside of a range in which a recording material passes. The gripping portion has a friction coefficient greater than that of the surface in the width-directional center portion, which portion corresponds to inside of the range in which the recording material passes. A gripping portion pressurizing part is located inside the gripping portion at both end portions of the pressure belt so as to pressurize the gripping portion of the pressure belt against the gripping portion of the heating roller. This makes it possible to improve frictional resistance between the gripping portions of the heating roller and the pressure belt. Thus, the fixing device allows preventing the conveyance error of the recording material, so that the image quality can be improved, and also the fixing device can be reduced in size and weight.