Abstract: An image forming apparatus includes plural rotating members that are rotatable; an annular circulating member that is wound around the plural rotating members and circulates when the rotating members rotate; a retaining member attached to an attaching portion of the circulating member and that circulates together with the circulating member, the retaining member being configured to retain a recording medium in an area where the attaching portion comes into contact with one of the rotating members; an image forming section that forms an image on the recording medium at an image forming position defined on a circulation path along which the circulating member circulates; a delivering unit that delivers the recording medium to a retaining position where the recording medium is to be retained by the retaining member; a detector that detects rotation of the one rotating member; and a controller that controls delivery of the recording medium from the delivering unit to the retaining position, the delivery being con

Abstract: An image forming apparatus includes an apparatus body including a drive source, a rotary member, and a first coupling movable in an axial direction with respect to the rotary member, and a unit attachable to and detachable from the apparatus body, the unit including a second coupling configured to receive the driving force by engaging with the first coupling. The rotary member includes an abutting portion. The first coupling includes an abutted portion configured to be abutted with the abutting portion, and is configured to rotate in the first rotation direction together with the rotary member in a case where the abutting portion presses the abutted portion. The apparatus body further includes a first urging member configured to urge the first coupling in a second rotation direction opposite to the first rotation direction.

Abstract: A detection device includes a first detection unit that detects a leading edge portion and a trailing edge portion of a medium before the medium is heated, and a second detection unit that differs from the first detection unit and that detects the leading edge portion and the trailing edge portion of the medium after the medium is heated.

Abstract: An image forming apparatus includes: a circulating member that is a part of a transport path that transports a recording medium; a holding member that is fixed to the circulating member, circulates, and holds a leading end portion of the recording medium; an image forming section that forms an image on the recording medium at an image forming position in a circulation path of the circulating member; and a feeding section that feeds out the recording medium to a holding position where the holding member holds the leading end portion of the recording medium. When a circulation velocity Vg is defined as a velocity at which the circulating member circulates the holding member, a transport velocity of the recording medium is reduced from a first transport velocity V1, which is higher than the circulation velocity Vg, to a second transport velocity V2, which is lower than the first transport velocity V1, before the leading end portion of the recording medium enters the holding position.

Abstract: A detection device includes: a transport unit that stops transportation of a medium on which a first image is formed, the transport unit restarting the transportation of the medium toward an image forming unit after the medium has been in a stopped state, the image forming unit forming a second image on the medium; and a detection unit that detects an edge portion of the medium while the medium is in the stopped state.

Abstract: A detection device includes a transport passage along which a medium is transported and a detection unit that detects a leading edge portion and a trailing edge portion of the medium in the transport passage while transportation of the medium is stopped and while the medium is pulled in a pulling direction along the transport passage.

Abstract: A detection device includes a transport passage along which a medium is transported and a detection unit that detects a leading edge portion and a trailing edge portion of the medium in the transport passage while transportation of the medium is stopped and while the medium is pulled in a pulling direction along the transport passage.

Abstract: A detection device includes a first detection unit that detects a leading edge portion and a trailing edge portion of a medium before the medium is heated, and a second detection unit that differs from the first detection unit and that detects the leading edge portion and the trailing edge portion of the medium after the medium is heated.

Abstract: An image forming apparatus includes: a fixing cylinder that is rotatably supported, that has a groove formed in an outer portion thereof in a rotational radial direction thereof, and that causes an image transferred to a recording medium to be fixed to the recording medium when the recording medium passes along an outer surface of the fixing cylinder in the rotational radial direction; a delivery cylinder that is rotatably supported; a circulating member that is loop-shaped and wrapped at least around the fixing cylinder and the delivery cylinder; plural holding members configured to hold the recording medium when the recording medium passes around the delivery cylinder toward the fixing cylinder, the holding members being supported by the circulating member such that the holding members are arranged in a length direction of the circulating member with predetermined intervals therebetween, each holding member being disposed in the groove when the holding member passes along the outer portion of the fixing cyl

Abstract: A detection device includes a first detection unit that detects a leading edge portion and a trailing edge portion of a medium while the medium is being transported, and a second detection unit that detects both edge portions of the medium in an orthogonal direction that is orthogonal to a transporting direction of the medium while the medium is being transported.

Abstract: An image forming apparatus includes: a circulating member that is a part of a transport path that transports a recording medium; a holding member that is fixed to the circulating member, circulates, and holds a leading end portion of the recording medium; an image forming section that forms an image on the recording medium at an image forming position in a circulation path of the circulating member; and a feeding section that feeds out the recording medium to a holding position where the holding member holds the leading end portion of the recording medium. When a circulation velocity Vg is defined as a velocity at which the circulating member circulates the holding member, a transport velocity of the recording medium is reduced from a first transport velocity V1, which is higher than the circulation velocity Vg, to a second transport velocity V2, which is lower than the first transport velocity V1, before the leading end portion of the recording medium enters the holding position.

Abstract: An image forming apparatus includes plural rotating members that are rotatable; an annular circulating member that is wound around the plural rotating members and circulates when the rotating members rotate; a retaining member attached to an attaching portion of the circulating member and that circulates together with the circulating member, the retaining member being configured to retain a recording medium in an area where the attaching portion comes into contact with one of the rotating members; an image forming section that forms an image on the recording medium at an image forming position defined on a circulation path along which the circulating member circulates; a delivering unit that delivers the recording medium to a retaining position where the recording medium is to be retained by the retaining member; a detector that detects rotation of the one rotating member; and a controller that controls delivery of the recording medium from the delivering unit to the retaining position, the delivery being con

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction; a sheet butting portion provided at one side of the transport path; a sheet rotating section; and a sheet butting section. When a short sheet is transported along the transport path, the sheet rotating section rotates the short sheet such that a leading end is directed to the other side of the transport path, and when a long sheet is transported, the sheet rotating section rotates the long sheet such that an angle of inclination with respect to the one direction is reduced. The sheet butting section moves the short sheet rotated by the sheet rotating section toward the one side to make the side edge of the short sheet butt against the sheet butting portion, while allowing the long sheet to pass therethrough without moving the long sheet toward the one side.

Abstract: A sheet conveying device includes: a conveyance path along which a sheet is conveyed; a plurality of butting target members that are arranged beside and alongside the conveyance path and against which a side edge of a sheet being conveyed along the conveyance path is caused to butt; and a butting device that causes the side edge of the sheet to butt against the butting target members by moving, toward the butting target members, the sheet being conveyed along the conveyance path using a plurality of sheet conveying structures that are deviated from each other in a sheet conveying direction, and two or more of the butting target members are located downstream of a sheet conveying structure that is located second in the upstream direction from a most downstream one among the plurality of sheet conveying structures.

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction, the sheet being transported with a corner at a leading end of the sheet being located on a first lateral side of the path, a sheet rotating section that rotates the sheet so as to increase an angle of the sheet and so as to orient the leading end, a sheet moving section that moves the sheet toward the first lateral side, and plural sheet butting portions that are arranged side-by-side in the one direction, on the first lateral side, the sheet butting portions allowing the moved sheet to be butted thereagainst to orient the sheet in the one direction. When the sheet is butted against the sheet butting portions to be oriented in the one direction, the corner is located at a position where no sheet butting portions are provided.

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction; a sheet butting portion against which a side edge of the sheet on the transport path is butted, the sheet butting portion being provided at one side of the transport path; a butting section that moves the sheet toward the one side to butt the side edge against the sheet butting portion; and a sheet rotating section located on the upstream side of the butting section in a sheet transport direction, the sheet rotating section having two sheet transport parts provided so as to be shifted from each other in a direction intersecting the one direction, at least one of the sheet transport parts being configured to have a variable sheet transport speed, the sheet rotating section rotating the sheet by utilizing a difference in transport speed between the two sheet transport parts.

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction, the sheet being transported with a corner at a leading end of the sheet being located on a first lateral side of the path, a sheet rotating section that rotates the sheet so as to increase an angle of the sheet and so as to orient the leading end, a sheet moving section that moves the sheet toward the first lateral side, and plural sheet butting portions that are arranged side-by-side in the one direction, on the first lateral side, the sheet butting portions allowing the moved sheet to be butted thereagainst to orient the sheet in the one direction. When the sheet is butted against the sheet butting portions to be oriented in the one direction, the corner is located at a position where no sheet butting portions are provided.

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction; a sheet butting portion provided at one side of the transport path; a sheet rotating section; and a sheet butting section. When a short sheet is transported along the transport path, the sheet rotating section rotates the short sheet such that a leading end is directed to the other side of the transport path, and when a long sheet is transported, the sheet rotating section rotates the long sheet such that an angle of inclination with respect to the one direction is reduced. The sheet butting section moves the short sheet rotated by the sheet rotating section toward the one side to make the side edge of the short sheet butt against the sheet butting portion, while allowing the long sheet to pass therethrough without moving the long sheet toward the one side.

Abstract: A sheet conveying device includes: a conveyance path along which a sheet is conveyed; a plurality of butting target members that are arranged beside and alongside the conveyance path and against which a side edge of a sheet being conveyed along the conveyance path is caused to butt; and a butting device that causes the side edge of the sheet to butt against the butting target members by moving, toward the butting target members, the sheet being conveyed along the conveyance path using a plurality of sheet conveying structures that are deviated from each other in a sheet conveying direction, and two or more of the butting target members are located downstream of a sheet conveying structure that is located second in the upstream direction from a most downstream one among the plurality of sheet conveying structures.

Abstract: A sheet transport device includes a transport path along which a sheet is transported in one direction; a sheet butting portion against which a side edge of the sheet on the transport path is butted, the sheet butting portion being provided at one side of the transport path; a butting section that moves the sheet toward the one side to butt the side edge against the sheet butting portion; and a sheet rotating section located on the upstream side of the butting section in a sheet transport direction, the sheet rotating section having two sheet transport parts provided so as to be shifted from each other in a direction intersecting the one direction, at least one of the sheet transport parts being configured to have a variable sheet transport speed, the sheet rotating section rotating the sheet by utilizing a difference in transport speed between the two sheet transport parts.