Abstract: A control section controls the rotation of a registration roller that corrects the skew of a sheet and conveys the sheet, and the rotation of a loop forming roller which forms a loop of the sheet, as well as the nipping and releasing of the nip of the loop forming roller. This control section controls so that the sheet with a loop formed between the registration roller and loop forming roller is conveyed downstream in the sheet conveyance direction, and the sheet is released from the nipping of the loop forming roller during the conveyance. This control section further controls so that the total number of rotations of the registration roller from the start of sheet conveyance till releasing of the sheet from nipping of the loop forming roller is kept at a prescribed total number of rotations preset in conformance to the paper type.

Abstract: An image forming apparatus, including an upper section including an image forming section to form an image on a recording sheet, a lower section arranged below the upper section including a sheet supplying tray to stack a plurality of recording sheets, a partitioning body to separate the upper section and the lower section in a vertical direction, wherein the lower section includes a dehumidification device to heat the inside of the lower section and to dehumidify the recording sheets stacked on the sheet supplying tray, the partitioning body includes a first shielding member to shield a bottom portion of the upper section, a second shielding member separated from the first shielding member to shield a top portion of the lower section, a clearance formed between the first shielding member and the second shielding member, and an air blowing section to blow air into the clearance.

Abstract: Disclosed is an image forming apparatus including: an image forming unit to form an image on a paper in an image forming position; a transportation path to transport the paper to the image forming position; an acquisition unit arranged upstream of the image forming position in a paper transportation direction and to acquire a shift amount from an edge reference position to an edge of the paper in a paper width direction perpendicular to the paper transportation direction; a pair of resist rollers arranged upstream of the acquisition unit in the paper transportation direction and capable of swinging in the paper width direction; and a control unit configured to determine an instruction value based on a paper state and the shift amount before the pair of resist rollers moves, and to move the pair of resist rollers in accordance with the instruction value in the paper width direction.

Abstract: An image forming apparatus including: an image formation section for forming a toner image based on image data on a recording medium; a first fixing device for fixing the toner image formed by the image formation section; an accommodation section for storing the first fixing device or a second fixing device having different specifications than those of the first fixing device; and a peripheral member arranged on the periphery of the accommodation section to operate synchronously with the first fixing device or second fixing device; wherein, when the first fixing device accommodated in the accommodation section has been replaced by the second fixing device, a status of the peripheral member is switched in conformity to specifications of the second fixing device.

Abstract: An image forming apparatus, including an upper section including an image forming section to form an image on a recording sheet, a lower section arranged below the upper section including a sheet supplying tray to stack a plurality of recording sheets, a partitioning body to separate the upper section and the lower section in a vertical direction, wherein the lower section includes a dehumidification device to heat the inside of the lower section and to dehumidify the recording sheets stacked on the sheet supplying tray, the partitioning body includes a first shielding member to shield a bottom portion of the upper section, a second shielding member separated from the first shielding member to shield a top portion of the lower section, a clearance formed between the first shielding member and the second shielding member, and an air blowing section to blow air into the clearance.

Abstract: A control section controls the rotation of a registration roller that corrects the skew of a sheet and conveys the sheet, and the rotation of a loop forming roller which forms a loop of the sheet, as well as the nipping and releasing of the nip of the loop forming roller: This control section controls so that the sheet with a loop formed between the registration roller and loop forming roller is conveyed downstream in the sheet conveyance direction, and the sheet is released from the nipping of the loop forming roller during the conveyance. This control section further controls so that the total number of rotations of the registration roller from the start of sheet conveyance till releasing of the sheet from nipping of the loop forming roller is kept at a prescribed total number of rotations preset in conformance to the paper type.

Abstract: In an ejected sheet stacking device for use in an image forming apparatus provided with a sheet ejection part formed in a hollow place formed so as to open to an outer housing of the image forming apparatus and with a sheet storing mechanism for storing sheets ejected from a sheet ejection opening of the image forming apparatus, the ejected sheet stacking device comprising: a plurality of sheet storing trays arranged in a multi-stage way in a vertical direction; an ejecting and conveying mechanism for conveying a sheet ejected from the sheet ejection opening of the image forming apparatus to one of the sheet storing trays; and a conveyance path switching mechanism for switching a bifurcating conveyance path which bifurcates the sheet ejected from the sheet ejection opening to lead to each of the sheet storing trays. The ejected sheet stacking device is mounted to the image forming apparatus in place of the sheet storing mechanism.

Abstract: In an ejected sheet stacking device for use in an image forming apparatus provided with a sheet ejection part formed in a hollow place formed so as to open to an outer housing of the image forming apparatus and with a sheet storing mechanism for storing sheets ejected from a sheet ejection opening of the image forming apparatus, the ejected sheet stacking device comprising: a plurality of sheet storing trays arranged in a multi-stage way in a vertical direction; an ejecting and conveying mechanism for conveying a sheet ejected from the sheet ejection opening of the image forming apparatus to one of the sheet storing trays; and a conveyance path switching mechanism for switching a bifurcating conveyance path which bifurcates the sheet ejected from the sheet ejection opening to lead to each of the sheet storing trays. The ejected sheet stacking device is mounted to the image forming apparatus in place of the sheet storing mechanism.