Abstract: An image forming apparatus including a belt wound around a plurality of rollers, and a restriction portion disposed outside a specific roller of the plurality of rollers in a rotational axis direction of the specific roller, the restriction portion being configured to restrict movement of the belt in the rotational axis direction by contacting an end surface of the belt in the rotational axis direction, the belt having a first outer circumferential surface of an end portion of the belt in the rotational axis direction, the end portion including the end surface contactable with the restriction portion, and a second outer circumferential surface of a middle portion of the belt in the rotational axis direction, the first outer circumferential surface being positioned outside the second outer circumferential surface in a radial direction of the specific roller, the first outer circumferential surface being parallel to the second outer circumferential surface.

Abstract: A belt unit including an endless belt, a first roller, a second roller, and a guiding member is provided. The guiding member includes a groove, in which a guided section of the endless belt is set, and the groove includes a first face and a second face. The first face is formed to have a first parting line extending in a direction to intersect with a central axis. The first face includes a first part in a frontward range and a second part in a rearward range with respect to the first parting line along a rotating direction of the guiding member. The first face has a first gap between the first part and the second part to form the first part in a position closer to the second face with respect to the second part.

Abstract: A belt unit is provided with an endless belt, a pair of rollers around which the endless belt is wound, and a regulating member having a flange surface provided at one axial end of at least one of the pair of rollers. The flange surface extends on an outer side with respect to an outer surface of the endless belt wound around the pair of rollers, the flange surface is configured to contact an end, in a width direction, of the endless belt to prevent the endless belt from moving obliquely, and the flange surface is formed with a conical surface which is configured such that a portion closer to a peripheral side of the conical surface is closer to an axial center of the at least one of the pair of rollers.

Abstract: An image forming apparatus including a belt wound around a plurality of rollers, and a restriction portion disposed outside a specific roller of the plurality of rollers in a rotational axis direction of the specific roller, the restriction portion being configured to restrict movement of the belt in the rotational axis direction by contacting an end surface of the belt in the rotational axis direction, the belt having a first outer circumferential surface of an end portion of the belt in the rotational axis direction, the end portion including the end surface contactable with the restriction portion, and a second outer circumferential surface of a middle portion of the belt in the rotational axis direction, the first outer circumferential surface being positioned outside the second outer circumferential surface in a radial direction of the specific roller, the first outer circumferential surface being parallel to the second outer circumferential surface.

Abstract: A belt unit, including an endless belt, a first roller, a second roller, and a guiding member, is provided. The endless belt includes a belt strip and a guided section protruding from an inner circumferential surface of the belt strip. The guiding member with a groove is arranged on one of axial-end sides of the first roller coaxially with the first roller. The guided section of the endless belt is set in the groove. The groove includes a first face and a second face facing each other along a direction in parallel with a central axis of the first roller. The guiding member includes a first piece containing the first face and a second piece containing the second face. The first face protrudes outwardly with respect to the inner circumferential surface of the belt strip.

Abstract: A belt unit including an endless belt, a first roller, a second roller, and a guiding member is provided. The guiding member includes a groove, in which a guided section of the endless belt is set, and the groove includes a first face and a second face. The first face is formed to have a first parting line extending in a direction to intersect with a central axis. The first face includes a first part in a frontward range and a second part in a rearward range with respect to the first parting line along a rotating direction of the guiding member. The first face has a first gap between the first part and the second part to form the first part in a position closer to the second face with respect to the second part.

Abstract: A belt unit, including an endless belt, a first roller, a second roller, and a guiding member, is provided. The endless belt includes a belt strip and a guided section protruding from an inner circumferential surface of the belt strip. The guiding member with a groove is arranged on one of axial-end sides of the first roller coaxially with the first roller. The guided section of the endless belt is set in the groove. The groove includes a first face and a second face facing each other along a direction in parallel with a central axis of the first roller. The guiding member includes a first piece containing the first face and a second piece containing the second face. The first face protrudes outwardly with respect to the inner circumferential surface of the belt strip.

Abstract: A belt unit is provided with an endless belt, a pair of rollers around which the endless belt is wound, and a regulating member having a flange surface provided at one axial end of at least one of the pair of rollers. The flange surface extends on an outer side with respect to an outer surface of the endless belt wound around the pair of rollers, the flange surface is configured to contact an end, in a width direction, of the endless belt to prevent the endless belt from moving obliquely, and the flange surface is formed with a conical surface which is configured such that a portion closer to a peripheral side of the conical surface is closer to an axial center of the at least one of the pair of rollers.