Abstract: A sheet conveying device of the present disclosure includes: a conveying portion that conveys a sheet in a conveying direction directed toward an image transfer position; a detection portion that detects a conveyance deviation of the sheet conveyed; a sheet correction portion provided on a downstream side of the conveying portion in the conveying direction; and a speed control portion that controls a displacement speed of the sheet correction portion during a displacement process of the sheet correction portion from a sheet acceptance position to a correction completion position. The speed control portion causes the sheet correction portion to be displaced to a setting position set between the sheet acceptance position and the correction completion position at a predetermined first speed, and causes the sheet correction portion to be displaced from the setting position to the correction completion position at a second speed lower than the first speed.

Abstract: A sheet conveying device includes a sheet detection unit and a position adjusting mechanism. The position adjusting mechanism is disposed on a downstream side of the sheet detection unit in a sheet conveying direction in the sheet conveying path, includes an adjusting roller pair, and performs skew correction and positional displacement correction of a sheet, while conveying the sheet. The sheet conveying path includes a first conveying roller pair disposed on an upstream side of the position adjusting mechanism in the sheet conveying direction, and a curved part disposed between the adjusting roller pair and the first conveying roller pair, which curves in an S shape so as to be convex in a front and back side direction of the sheet alternately at different positions in the sheet conveying direction. The adjusting roller pair nips and conveys the sheet together with the first conveying roller pair.

Abstract: A transfer unit includes, as transfer rollers, a first roller and a second roller of which the latter has an elastic layer larger in an axial direction than that of the former, a first bearing member, a second bearing member, a roller holder, a first urging member, a second urging member, a switching cam, a transfer voltage power supply, and a driving mechanism. By rotating the roller holder, one of the first and second rollers is arranged opposite an image carrying member and, by rotating the switching cam, the first or second roller arranged opposite the image carrying member is arranged either at a reference position at which, by being kept in pressed contact with the image carrying member, the first or second roller forms a transfer nip or at a released position at which the first or second roller lies away from the image carrying member.

Abstract: A transfer unit includes, as transfer rollers, first and second rollers of which the second has an elastic layer larger in an axial direction than the first, first and second bearing members, a roller holder, first and second urging members, a switching cam, a driving mechanism, and a first pre-transfer guide. By rotating the roller holder, the first or second roller is arranged opposite an image carrier and, by rotating the switching cam, the first or second roller arranged opposite the image carrier is arranged selectively either at a reference position where the first or second roller is in pressed contact with the image carrier or at a released position where the first or second roller lies away from the image carrier. With the first or second roller arranged at the reference position, the first pre-transfer guide is arranged at a first guide position.

Abstract: A transfer unit includes first and second rollers of which the second roller has an elastic layer larger in the axial direction than the first roller, a roller holder, and a switching cam. One of the first and second rollers is, by rotating the roller holder, arranged opposite an image carrying member and, by rotating the switching cam, arranged selectively either at a reference position to form a transfer nip or at a released position to lie away from the image carrying member. Let a length of the elastic layer of the first roller in the axial direction, a width of an effective image area on the image carrying member to which a toner image can be transferred, and a width of a recording medium of a maximum size allowing transfer using the first roller be L1, L3, and L4 respectively, L4<L1?L3?5 mm is fulfilled.

Abstract: An image forming apparatus includes an image forming portion, an image input portion, a transfer unit, a transfer voltage power supply, and a control portion. The transfer unit includes a transfer roller having a metal shaft and an elastic layer laid around an outer circumferential face of the metal shaft to form a transfer nip by keeping the elastic layer in pressed contact with an image carrying member, and transfers a toner image formed on the image carrying member to a recording medium as it passes through the transfer nip. The transfer unit includes, as the transfer roller, a first roller, and a second roller having a larger axial-size elastic layer compared to the first roller. The control portion arranges the first or second roller opposite the image carrying member according to width-direction sizes of the recording medium and image data fed to the image input portion.

Abstract: A sheet conveying device includes a sheet detection unit and a position adjusting mechanism. The position adjusting mechanism is disposed on a downstream side of the sheet detection unit in a sheet conveying direction in the sheet conveying path, includes an adjusting roller pair, and performs skew correction and positional displacement correction of a sheet, while conveying the sheet. The sheet conveying path includes a first conveying roller pair disposed on an upstream side of the position adjusting mechanism in the sheet conveying direction, and a curved part disposed between the adjusting roller pair and the first conveying roller pair, which curves in an S shape so as to be convex in a front and back side direction of the sheet alternately at different positions in the sheet conveying direction. The adjusting roller pair nips and conveys the sheet together with the first conveying roller pair.

Abstract: An image forming apparatus includes an image forming portion, an image input portion, a transfer unit, a transfer voltage power supply, and a control portion. The transfer unit includes a transfer roller having a metal shaft and an elastic layer laid around the outer circumferential face of the metal shaft to form a transfer nip by keeping the elastic layer in pressed contact with an image carrying member, and transfers a toner image formed on the image carrying member to a recording medium as it passes through the transfer nip. The transfer unit includes, as the transfer roller, a first roller, and a second roller having a larger axial-size elastic layer compared to the first roller. The control portion arranges first or second roller opposite the image carrying member according to width-direction sizes of the recording medium and the image data fed to the image input portion.

Abstract: A transfer unit includes first and second rollers of which the second has an elastic layer larger in the axial direction than the first, a roller holder, and a switching cam. One of the first and second rollers is, by rotating the roller holder, arranged opposite the image carrying member and, by rotating the switching cam, arranged selectively either at a reference position to form a transfer nip or at a released position to lie away from the image carrying member. Let the length of the elastic layer of the first roller in the axial direction, the width of the effective image area on the image carrying member to which the toner image can be transferred, and the width of the recording medium of the maximum size allowing transfer using the first roller be L1, L3, and L4 respectively, L4<L1?L3?5 mm is fulfilled.

Abstract: A transfer unit includes, as transfer rollers, first and second rollers of which the second has an elastic layer larger in the axial direction than the first, first and second bearing members, a roller holder, first and second urging members, a switching cam, a driving mechanism, and a first pre-transfer guide. By rotating the roller holder, the first or second roller is arranged opposite an image carrier and, by rotating the switching cam, the first or second roller arranged opposite the image carrier is arranged selectively either at a reference position where the first or second roller is in pressed contact with the image carrier or at a released position where the first or second roller lies away from the image carrier. With the first or second roller arranged at the reference position, the first pre-transfer guide is arranged at a first guide position.

Abstract: A transfer unit includes, as transfer rollers, a first roller and a second roller of which the latter has an elastic layer larger in the axial direction than that of the former, a first bearing member, a second bearing member, a roller holder, a first urging member, a second urging member, a switching cam, a transfer voltage power supply, and a driving mechanism. By rotating the roller holder, one of the first and second rollers is arranged opposite an image carrying member and, by rotating the switching cam, the first or second roller arranged opposite the image carrying member is arranged either at a reference position at which, by being kept in pressed contact with the image carrying member, the first or second roller forms a transfer nip or at a released position at which the first or second roller lies away from the image carrying member.

Abstract: A fixing device includes a heating belt, a pressing roller, a pressing member and a cap. The pressing member faces an inner circumferential face of the heating belt via a lubricant. The cap is rotating together with the heating belt. The cap has a disk part, a cylindrical part, a gear and a hole part. The cylindrical part has an inner circumferential face coming into contact with the outer circumferential face of the heating belt. The gear is formed integrally with an outer face of the disk part. The hole part penetrates from the inner circumferential face of the cylindrical part to a face between adjacently disposed teeth of the gear. The lubricant flowed from the inner circumferential face of the heating belt to the outer circumferential face of the heating belt flows to a tooth surface of the gear through the hole part.

Abstract: A fixing device includes a heating belt, a pressing roller, a pressing member and a cap. The pressing member faces an inner circumferential face of the heating belt via a lubricant. The cap is rotating together with the heating belt. The cap has a disk part, a cylindrical part, a gear and a hole part. The cylindrical part has an inner circumferential face coming into contact with the outer circumferential face of the heating belt. The gear is formed integrally with an outer face of the disk part. The hole part penetrates from the inner circumferential face of the cylindrical part to a face between adjacently disposed teeth of the gear. The lubricant flowed from the inner circumferential face of the heating belt to the outer circumferential face of the heating belt flows to a tooth surface of the gear through the hole part.

Abstract: A fixing device includes a heating member, a pressing member, a pressing mechanism and a locking mechanism. The heating member is rotatable. The pressing roller is configured to come into contact with the heating member. The pressing mechanism is configured to convert a rotational force transmitted from a drive source to a pressing force of pressing the pressing roller against the heating member and to form a pressing region between the pressing roller and the heating member. A sheet is conveyed through the pressing region. The locking mechanism is configured to be engaged with an image forming apparatus main body linked with a pressing operation of applying the pressing force to the pressing roller and to be disengaged from the image forming apparatus main body linked with completion of a pressing release operation of removing the pressing force.

Abstract: A fixing device includes a heating member, a pressing member, a pressing mechanism and a locking mechanism. The heating member is rotatable. The pressing roller is configured to come into contact with the heating member. The pressing mechanism is configured to convert a rotational force transmitted from a drive source to a pressing force of pressing the pressing roller against the heating member and to form a pressing region between the pressing roller and the heating member. A sheet is conveyed through the pressing region. The locking mechanism is configured to be engaged with an image forming apparatus main body linked with a pressing operation of applying the pressing force to the pressing roller and to be disengaged from the image forming apparatus main body linked with completion of a pressing release operation of removing the pressing force.

Abstract: A fixing device includes a fixing member, a pressing member, a cover, and a separation member. The cover is movable between a closing position at which a conveyance path is formed and an opening position at which the conveyance path is exposed. The cover includes a recess. The separation member is movable between a contact position at which the separation member comes in contact with a face of the fixing member and a withdrawing position at which the separation member is separated from the fixing member. The separation member separates a medium from the face of the fixing member in a state in which the separation member is arranged at the contact position. A tip end part of the separation member enters an interior of the recess of the cover in a state in which the separation member is arranged at the withdrawing position.

Abstract: A fixing device includes a fixing member, a pressing member, a cover, and a separation member. The cover is movable between a closing position at which a conveyance path is formed and an opening position at which the conveyance path is exposed. The cover includes a recess. The separation member is movable between a contact position at which the separation member comes in contact with a face of the fixing member and a withdrawing position at which the separation member is separated from the fixing member. The separation member separates a medium from the face of the fixing member in a state in which the separation member is arranged at the contact position. A tip end part of the separation member enters an interior of the recess of the cover in a state in which the separation member is arranged at the withdrawing position.

Abstract: An image forming apparatus has a cooler, an air passage switching member, a swing mechanism, a drive gear train, and a restricting mechanism. The air passage switching member is swingable and switches the path of cooling air produced by the cooler. The swing mechanism swings the air passage switching member. The drive gear train transmits a rotation driving force to the swing mechanism. The restricting mechanism restricts the swinging range of the swing mechanism. The swing mechanism has a first gear coupled to the drive gear train, and an actuator swingably coupled to the first gear with a predetermined load and coupled to the air passage switching member. By swinging the actuator together with the first gear while restricting the swinging range of the actuator with the restricting mechanism, the air passage switching member is switched between a first position and a second position.

Abstract: A sheet guiding mechanism includes a pair of first rotators and a pair of second rotators provided in a conveying path for a sheet material, a first sheet guide portion, a second sheet guide portion, a shaft member, and a plurality of guide rollers. The first sheet guide portion and the second sheet guide portion form guide surfaces for the sheet material on both sides of the conveying path. Both end portions of the shaft member extending along a width direction are supported by the second sheet guide portion. The guide rollers are in contact with the sheet material conveyed in the conveying path, and rotate to follow the sheet material. The shaft member is bent by a pressure applied from the sheet material to the guide rollers when a tension is applied to the sheet material between the pair of first rotators and the pair of second rotators.

Abstract: An image forming apparatus has a cooler, an air passage switching member, a swing mechanism, a drive gear train, and a restricting mechanism. The air passage switching member is swingable and switches the path of cooling air produced by the cooler. The swing mechanism swings the air passage switching member. The drive gear train transmits a rotation driving force to the swing mechanism. The restricting mechanism restricts the swinging range of the swing mechanism. The swing mechanism has a first gear coupled to the drive gear train, and an actuator swingably coupled to the first gear with a predetermined load and coupled to the air passage switching member. By swinging the actuator together with the first gear while restricting the swinging range of the actuator with the restricting mechanism, the air passage switching member is switched between a first position and a second position.