Abstract: An inkjet recording apparatus includes three or more recording heads. The recording heads contain different inks and eject the different inks sequentially on a recording medium. The different inks each contain a pigment and a polyhydric alcohol monobutyl ether. Of the different inks, an ink to be ejected first has the lowest pigment content ratio. Of the different inks, an ink to be ejected third and an ink to be subsequently ejected each have a pigment content ratio equal to or higher than that of a corresponding one of inks to be precedently ejected. Of the different inks, an ink to be ejected second and an ink to be subsequently ejected each have a polyhydric alcohol monobutyl ether content ratio higher than that of a corresponding one of inks to be precedently ejected.

Abstract: An inkjet recording apparatus includes three or more recording heads. The recording heads contain different inks and eject the different inks sequentially on a recording medium. The different inks each contain a pigment. Of the different inks, an ink to be ejected first has the lowest pigment content ratio. Of the different inks, an ink to be ejected third and an ink to be subsequently ejected each have a pigment content ratio equal to or higher than that of the pigment contained in a corresponding one of inks to be precedently ejected. Of the different inks, an ink to be ejected second and an ink to be subsequently ejected each have a lower viscosity at 25° C. than a corresponding one of inks to be precedently ejected.

Abstract: A transfer device includes a conveyance belt, a transfer roller, a stretch roller, and a cleaning member. The conveyance belt is configured to convey a sheet via a contact position with an image carrier. The transfer roller is configured to transfer the toner image onto the sheet at the contact position. The stretch roller is configured to stretch the conveyance belt at a separation position where the sheet is separated from the conveyance belt and the stretch roller is grounded via a resistance portion having electrical resistance. The cleaning member is provided to oppose the stretch roller across the conveyance belt, downstream, in a running direction of the conveyance belt, from the separation position, and is configured to attract the toner attached to a surface of the conveyance belt upon application of a voltage having a polarity opposite to the charge polarity of the toner.

Abstract: A transfer device includes a conveyance belt, a transfer roller, a stretch roller, and a cleaning member. The conveyance belt is configured to convey a sheet via a contact position with an image carrier. The transfer roller is configured to transfer the toner image onto the sheet at the contact position. The stretch roller is configured to stretch the conveyance belt at a separation position where the sheet is separated from the conveyance belt and the stretch roller is grounded via a resistance portion having electrical resistance. The cleaning member is provided to oppose the stretch roller across the conveyance belt, downstream, in a running direction of the conveyance belt, from the separation position, and is configured to attract the toner attached to a surface of the conveyance belt upon application of a voltage having a polarity opposite to the charge polarity of the toner.

Abstract: An image forming apparatus includes an image carrier, a conveyance belt, a transfer roller, a suspension roller, and a conductive opposed member. The conveyance belt is in contact with the image carrier to form a nip and conveys a sheet via the nip position. A voltage of reversed polarity to a charge polarity of toner forming the toner image is applied to the transfer roller to transfer the toner image to the sheet at the nip position. A suspension roller suspends the conveyance belt at a separation position. The separation position is downstream with respect to the nip position in a sheet conveyance direction. The separation position is positioned where the sheet separates from the conveyance belt. The voltage of reversed polarity to the charge polarity of the toner is applied to the suspension roller. The conductive opposed member is arranged opposed to the suspension roller across the conveyance belt.

Abstract: A transfer device includes a conveyance belt, a transfer roller, and a stretch roller. The conveyance belt is in contact with an image carrier that carries a toner image, and conveys a sheet via a contact position with the image carrier. A voltage having a polarity opposite to a charging polarity of toner that forms the toner image is applied to the transfer roller, and the transfer roller transfers the toner image carried by the image carrier onto the sheet at the contact position. The stretch roller stretches the conveyance belt at a separation position in which the sheet is separated from the conveyance belt and which is downstream of the contact position in a conveyance direction in which the sheet is conveyed by the conveyance belt, and the voltage having the polarity opposite to the charging polarity of the toner is applied to the stretch roller.

Abstract: A transfer device (35) includes a conveyance belt (351), a transfer roller (352), and a stretch roller (354). The conveyance belt (351) is in contact with an image carrier (31) that carries a toner image, and conveys a sheet via a contact position with the image carrier (31). A voltage having a polarity opposite to a charging polarity of toner that forms the toner image is applied to the transfer roller (352), and the transfer roller (352) transfers the toner image carried by the image carrier (31) onto the sheet at the contact position. The stretch roller (354) is in an insulated state, and stretches the conveyance belt (351) at a separation position in which the sheet is separated from the conveyance belt (351) and which is downstream of the contact position in a conveyance direction in which the sheet is conveyed by the conveyance belt (351).

Abstract: In printing, a first power supply unit applies a transfer current with a polarity opposite to a charged polarity of toner to the transfer roller. A second power supply unit applies a toner scattering suppression current with a polarity opposite to the charged polarity of the toner to a stretching roller until a rear end of a sheet passes through a separation position after a front end of the sheet reaches the separation position. The first power supply unit applies a post-transfer current, which has a polarity opposite to the charged polarity of the toner and has an absolute value equal to or more than an absolute value of the toner scattering suppression current, to the transfer roller until the rear end of the sheet passes through the separation position after the rear end of the sheet passes through the nip position.

Abstract: In printing, a first power supply unit applies a transfer current with a polarity opposite to a charged polarity of toner to the transfer roller. A second power supply unit applies a toner scattering suppression current with a polarity opposite to the charged polarity of the toner to a stretching roller until a rear end of a sheet passes through a separation position after a front end of the sheet reaches the separation position. The first power supply unit applies a post-transfer current, which has a polarity opposite to the charged polarity of the toner and has an absolute value equal to or more than an absolute value of the toner scattering suppression current, to the transfer roller until the rear end of the sheet passes through the separation position after the rear end of the sheet passes through the nip position.

Abstract: An image forming apparatus includes an image carrier, a conveyance belt, a transfer roller, a suspension roller, and a conductive opposed member. The conveyance belt is in contact with the image carrier to form a nip and conveys a sheet via the nip position. A voltage of reversed polarity to a charge polarity of toner forming the toner image is applied to the transfer roller to transfer the toner image to the sheet at the nip position. A suspension roller suspends the conveyance belt at a separation position. The separation position is downstream with respect to the nip position in a sheet conveyance direction. The separation position is positioned where the sheet separates from the conveyance belt. The voltage of reversed polarity to the charge polarity of the toner is applied to the suspension roller. The conductive opposed member is arranged opposed to the suspension roller across the conveyance belt.

Abstract: A transfer device (35) includes a conveyance belt (351), a transfer roller (352), and a stretch roller (354). The conveyance belt (351) is in contact with an image carrier (31) that carries a toner image, and conveys a sheet via a contact position with the image carrier (31). A voltage having a polarity opposite to a charging polarity of toner that forms the toner image is applied to the transfer roller (352), and the transfer roller (352) transfers the toner image carried by the image carrier (31) onto the sheet at the contact position. The stretch roller (354) is in an insulated state, and stretches the conveyance belt (351) at a separation position in which the sheet is separated from the conveyance belt (351) and which is downstream of the contact position in a conveyance direction in which the sheet is conveyed by the conveyance belt (351).

Abstract: A transfer device includes a conveyance belt, a transfer roller, and a stretch roller. The conveyance belt is in contact with an image carrier that carries a toner image, and conveys a sheet via a contact position with the image carrier. A voltage having a polarity opposite to a charging polarity of toner that forms the toner image is applied to the transfer roller, and the transfer roller transfers the toner image carried by the image carrier onto the sheet at the contact position. The stretch roller stretches the conveyance belt at a separation position in which the sheet is separated from the conveyance belt and which is downstream of the contact position in a conveyance direction in which the sheet is conveyed by the conveyance belt, and the voltage having the polarity opposite to the charging polarity of the toner is applied to the stretch roller.

Abstract: An image forming apparatus includes: an image carrier; a transfer belt facing a surface of the image carrier, forming a nip serving as a transfer position with the image carrier, and configured to transfer a toner image formed on the surface of the image carrier to a recording paper sheet with a transfer bias of opposite polarity to the surface of the image carrier; a fixing section configured to heat the sheet having the transferred toner image thereon to fix the toner image; and a static eliminator disposed downstream of the transfer position in a direction of conveyance of the sheet and configured to expose a back surface of the sheet opposite to the surface having the transferred toner image thereon to a DC discharge having the same polarity as the transfer bias and directed toward a position where the sheet separates from the transfer belt.

Abstract: A transferring device includes a conveying belt, a transferring roller, a stretching roller and a guide member. The conveying belt comes into contact with an image carrier carrying a toner image and conveys a sheet via a contact position to the image carrier. The transferring roller takes applying of voltage with a reversed polarity to a charged polarity of the toner forming the toner image and transfers the toner image carried on the image carrier onto the sheet at the contact position. The stretching roller stretches the conveying belt at a downstream side from the contact position in a conveying direction of the conveying belt and at a separation position of the sheet separated from the conveying belt. The guide member is arranged at a position facing to the sheet conveyed from the stretching roller to a fixing device to take applying of the voltage with the reversed polarity.

Abstract: An image forming apparatus (1) includes an image forming section (12), an intermediate transfer belt (125), a drive roller (125A), a secondary transfer roller (210), a brush section (80), a cleaning device (70), a power supply device (81), and a ground portion (82). The brush section (80) is disposed at a location downstream of the secondary transfer roller (210) in a direction of travel of the intermediate transfer belt (125) and facing the drive roller (125A) with the intermediate transfer belt (125) in between. A potential difference is applied between the brush section (80) and the secondary transfer roller (210) by the power supply device (81) and the ground portion (82), so that an electric current having the same polarity as a normal charge polarity flows from the brush section (80) through the drive roller (125A) to the secondary transfer roller (210).

Abstract: A transferring device includes a conveying belt, a transferring roller, a stretching roller and a guide member. The conveying belt comes into contact with an image carrier carrying a toner image and conveys a sheet via a contact position to the image carrier. The transferring roller takes applying of voltage with a reversed polarity to a charged polarity of the toner forming the toner image and transfers the toner image carried on the image carrier onto the sheet at the contact position. The stretching roller stretches the conveying belt at a downstream side from the contact position in a conveying direction of the conveying belt and at a separation position of the sheet separated from the conveying belt. The guide member is arranged at a position facing to the sheet conveyed from the stretching roller to a fixing device to take applying of the voltage with the reversed polarity.

Abstract: An image forming apparatus (1) includes an image forming section (12), an intermediate transfer belt (125), a drive roller (125A), a secondary transfer roller (210), a brush section (80), a cleaning device (70), a power supply device (81), and a ground portion (82). The brush section (80) is disposed at a location downstream of the secondary transfer roller (210) in a direction of travel of the intermediate transfer belt (125) and facing the drive roller (125A) with the intermediate transfer belt (125) in between. A potential difference is applied between the brush section (80) and the secondary transfer roller (210) by the power supply device (81) and the ground portion (82), so that an electric current having the same polarity as a normal charge polarity flows from the brush section (80) through the drive roller (125A) to the secondary transfer roller (210).

Abstract: An image forming apparatus includes: a photosensitive drum; a transfer belt configured to be charged to an opposite polarity to the surface of the photosensitive drum to electrostatically attract a recording paper sheet and convey the sheet while pressing the sheet against the photosensitive drum, thereby transferring a toner image formed on the surface of the photosensitive drum to the sheet; a fixing section configured to apply heat to the recording paper sheet having the toner image transferred thereto and thus fix the toner image on the sheet; a toner collecting member disposed to face a separating position where the recording paper sheet is separated from the transfer belt and extending in a width direction of the sheet being conveyed, the toner collecting member being electrically grounded; and a thermally conductive member configured to collect heat near the fixing section and conduct the collected heat to the toner collecting member.

Abstract: An image forming apparatus includes an image carrying member, a transport belt, a driving roller, a transferring member, a nip portion, and an applying portion. The transferring member makes contact with the inner circumferential surface of the transport belt to press the transport belt against the image carrying member. The nip portion is formed between the transport belt and the image carrying member by the pressure of the transferring member. The applying portion applies a bias to the transferring member. Application of the bias to the transferring member causes, at the nip portion, the toner image carried on the image carrying member to be transferred to the recording medium carried on the transport belt. Near the nip portion, a pair of support members are arranged which keeps both width-direction end parts of the transport belt in contact with the image carrying member.

Abstract: An image forming apparatus includes: a photosensitive drum; a transfer belt configured to be charged to an opposite polarity to the surface of the photosensitive drum to electrostatically attract a recording paper sheet and convey the sheet while pressing the sheet against the photosensitive drum, thereby transferring a toner image formed on the surface of the photosensitive drum to the sheet; a fixing section configured to apply heat to the recording paper sheet having the toner image transferred thereto and thus fix the toner image on the sheet; a toner collecting member disposed to face a separating position where the recording paper sheet is separated from the transfer belt and extending in a width direction of the sheet being conveyed, the toner collecting member being electrically grounded; and a thermally conductive member configured to collect heat near the fixing section and conduct the collected heat to the toner collecting member.