Abstract: A coating device includes a coating roller configured to rotate in a rotation direction to apply a treatment liquid onto a sheet at an application position, and a contacting member in contact with a peripheral surface of the coating roller at a position downstream of the application position in the rotation direction.

Abstract: A conveying device includes a sensor to read a sheet to be conveyed, a first conveyor arranged on an upstream side from the sensor in a sheet conveying direction of the sheet, a second conveyor arranged on a downstream side from the sensor in the sheet conveying direction, and correcting circuitry to correct a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance. The correcting circuitry uses at least a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

Abstract: An image forming apparatus, in which an image forming method is performed, includes an image forming device to form an image on a recording medium, a reading device to scan the recording medium having a position detection mark and generate a scanned image, and circuitry to calculate a plurality of correction values to adjust a position of the image to be formed on the recording medium, based on the scanned image. The circuitry is configured to calculate a first correction value based on a first scanned image generated from a first face of the recording medium, calculate a second correction value based on a second scanned image generated from a second face of the recording medium, and calculate a third correction value to adjust a position of an image to be formed on the second face, based on the first scanned image using the first correction value.

Abstract: A conveying device includes a sensor to read a sheet to be conveyed, a first conveyor arranged on an upstream side from the sensor in a sheet conveying direction of the sheet, a second conveyor arranged on a downstream side from the sensor in the sheet conveying direction, and correcting circuitry to correct a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance. The correcting circuitry uses at least a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

Abstract: An image forming apparatus, in which an image forming method is performed, includes an image forming device to form an image on a recording medium, a reading device to scan the recording medium having a position detection mark and generate a scanned image, and circuitry to calculate a plurality of correction values to adjust a position of the image to be formed on the recording medium, based on the scanned image. The circuitry is configured to calculate a first correction value based on a first scanned image generated from a first face of the recording medium, calculate a second correction value based on a second scanned image generated from a second face of the recording medium, and calculate a third correction value to adjust a position of an image to be formed on the second face, based on the first scanned image using the first correction value.

Abstract: A sheet conveying device, which is included in an image forming apparatus and a post processing device, includes a position detector configured to detect a position of a sheet, a sheet conveying body, a fixed body, a movable body configured to move, relative to the fixing body, between a first position and a second position different from the first position, and an index mounted on the fixed body. The sheet conveying device further includes a data storing device, a conveyance positional deviation calculator configured to calculate a positional deviation amount of the sheet to the reference sheet conveyance position, a detected positional deviation calculator configured to calculate a positional deviation amount of the position detector to the index based on a result of the position detector, and a reference position detector configured to correct the reference sheet conveyance position based on a result of the detected positional deviation calculator.

Abstract: A sheet conveying device, which is included in an image forming apparatus and a post processing device, includes a position detector configured to detect a position of a sheet, a sheet conveying body, a fixed body, a movable body configured to move, relative to the fixing body, between a first position and a second position different from the first position, and an index mounted on the fixed body. The sheet conveying device further includes a data storing device, a conveyance positional deviation calculator configured to calculate a positional deviation amount of the sheet to the reference sheet conveyance position, a detected positional deviation calculator configured to calculate a positional deviation amount of the position detector to the index based on a result of the position detector, and a reference position detector configured to correct the reference sheet conveyance position based on a result of the detected positional deviation calculator.

Abstract: An image forming apparatus includes an image forming device configured to form a first image on a first side of a recording medium and a second image on a second side of the recording medium, a position detector configured to detect respective positions of the first and second images, and a controller configured to perform, based on detection results obtained by the position detector, at least one of an image position correction by matching the first and second images and a magnification error correction by calculating and correcting a magnification error of one of the first and second images relative to the other. A program product used in the image forming apparatus includes a method of forming the first image and the second image, detecting the respective positions of the first and second images, and matching a position or a size of the first and second images.

Abstract: An image forming apparatus including an image forming unit configured to form an image on a recording medium; an edge detecting unit configured to detect edge positions at a plurality of portions along each side of the recording medium being conveyed; a shape detecting unit configured to detect a shape of the recording medium, based on an edge detection result obtained by the edge detecting unit; and an image correcting unit configured to correct the image to be formed on the recording medium, based on a change in the shape of the recording medium before and after image forming, the change being detected by the shape detecting unit.

Abstract: An image forming apparatus includes an image forming device configured to form a. first image on a first side of a recording medium and a second image on a second side of the recording medium, a position detector configured to detect respective positions of the first and second images, and a controller configured to perform, based on detection results obtained by the position detector, at least one of an image position correction by matching the first and second images and a magnification error correction by calculating and correcting a magnification error of one of the first and second images relative to the other. A program product used in the image forming apparatus includes a method of forming the first image and the second image, detecting the respective positions of the first and second images, and matching a position or a size of the first and second images.

Abstract: A sheet conveyor, which is incorporated in an image forming apparatus, includes a first conveyor to convey a sheet via a first sheet conveying path and move in a direction intersecting a sheet thickness direction, a second conveyor to convey the sheet via a second sheet conveying path and include a third conveyor and a fourth conveyor bringing either one close to and away from the other via the second sheet conveying path in the sheet thickness direction, a first attaching part provided to the first conveyor to attach the first conveyor to the sheet conveyor, and a state changer to change a state of one of the first attaching part to a movement allowed state and the second conveyor to a sheet releasing state in conjunction with a releasing action of the other of the first attaching part and the second conveyor.

Abstract: A sheet conveyor includes a first conveyance belt, a second conveyance belt, a first driving roller, a second driving roller, a first gear, and a second gear. In switching between sandwich and separation states, an axial center of a rotation shaft of the first or second gear moves on a movement plane substantially perpendicular to a direction in which the first conveyance belt and the second conveyance belt convey a sheet. Where L represents diameter of a tooth edge circle of the second gear in unit of millimeter and T1 represents a chordal tooth thickness of the second gear, an acute-side angle ? in unit of degree (°) formed by the movement plane and an interaxial-center plane including the axial center of the rotation shaft of each of the first gear and the second gear in the sandwich state is within a range represented by the following Formula 1: Tan?1(2×T1/L)<|?|<45°.

Abstract: An image forming apparatus including an image forming unit configured to form an image on a recording medium; an edge detecting unit configured to detect edge positions at a plurality of portions along each side of the recording medium being conveyed; a shape detecting unit configured to detect a shape of the recording medium, based on an edge detection result obtained by the edge detecting unit; and an image correcting unit configured to correct the image to be formed on the recording medium, based on a change in the shape of the recording medium before and after image forming, the change being detected by the shape detecting unit.

Abstract: A sheet conveyor, which is incorporated in an image forming apparatus, includes a first conveyor to convey a sheet via a first sheet conveying path and move in a direction intersecting a sheet thickness direction, a second conveyor to convey the sheet via a second sheet conveying path and include a third conveyor and a fourth conveyor bringing either one close to and away from the other via the second sheet conveying path in the sheet thickness direction, a first attaching part provided to the first conveyor to attach the first conveyor to the sheet conveyor, and a state changer to change a state of one of the first attaching part to a movement allowed state and the second conveyor to a sheet releasing state in conjunction with a releasing action of the other of the first attaching part and the second conveyor.

Abstract: A sheet conveyor includes a first conveyance belt, a second conveyance belt, a first driving roller, a second driving roller, a first gear, and a second gear. In switching between sandwich and separation states, an axial center of a rotation shaft of the first or second gear moves on a movement plane substantially perpendicular to a direction in which the first conveyance belt and the second conveyance belt convey a sheet. Where L represents diameter of a tooth edge circle of the second gear in unit of millimeter and T1 represents a chordal tooth thickness of the second gear, an acute-side angle ? in unit of degree (°) formed by the movement plane and an interaxial-center plane including the axial center of the rotation shaft of each of the first gear and the second gear in the sandwich state is within a range represented by the following Formula 1: Tan?1(2×T1/L)<|?|<45°.

Abstract: A sheet conveying device includes a shift unit. The shift unit includes a gate member configured to align a recording medium being conveyed thereto by causing a leading end of the recording medium to abut against the gate member so that part of the recording medium bends to form a curved portion; a pair of registration rollers configured to convey the recording medium aligned by the gate member at a predetermined timing, the pair of registration rollers including a driving roller and a driven roller, the driving roller having a rotating shaft coaxial with a rotational central shaft of the gate member; and a drive transmitting unit configured to transmit rotational drive from a drive unit to the driving roller, the drive transmitting unit being disposed on an end side of the rotating shaft of the driving roller.

Abstract: A sheet conveying device includes a pair of upstream sheet conveying rollers, a pair of downstream sheet conveying rollers, and a gate unit including multiple striking faces disposed adjacent to the pair of downstream sheet conveying rollers. The gate unit is enabled to enter and evacuate from a sheet conveyance path. A skew correction control mechanism is provided to correct skew by bringing the gate unit into the sheet conveyance path to cause the striking faces to collide with a leading end of the sheet with the skew while rotating the pair of upstream sheet conveying rollers. One or more rollers are included in one of the pair of upstream sheet conveying rollers and are disposed in the vicinity of a widthwise center of the sheet conveyance path. A width of one or more rollers is smaller than a widthwise interval between the multiple striking faces.

Abstract: A sheet conveying device includes a pair of upstream sheet conveying rollers, a pair of downstream sheet conveying rollers, and a gate unit including multiple striking faces disposed adjacent to the pair of downstream sheet conveying rollers. The gate unit is enabled to enter and evacuate from a sheet conveyance path. A skew correction control mechanism is provided to correct skew by bringing the gate unit into the sheet conveyance path to cause the striking faces to collide with a leading end of the sheet with the skew while rotating the pair of upstream sheet conveying rollers. One or more rollers are included in one of the pair of upstream sheet conveying rollers and are disposed in the vicinity of a widthwise center of the sheet conveyance path. A width of one or more rollers is smaller than a widthwise interval between the multiple striking faces.

Abstract: A sheet conveying device includes a shift unit. The shift unit includes a gate member configured to align a recording medium being conveyed thereto by causing a leading end of the recording medium to abut against the gate member so that part of the recording medium bends to form a curved portion; a pair of registration rollers configured to convey the recording medium aligned by the gate member at a predetermined timing, the pair of registration rollers including a driving roller and a driven roller, the driving roller having a rotating shaft coaxial with a rotational central shaft of the gate member; and a drive transmitting unit configured to transmit rotational drive from a drive unit to the driving roller, the drive transmitting unit being disposed on an end side of the rotating shaft of the driving roller.

Abstract: A sheet conveyance unit includes first and second conveyance rollers facing each other, a first stopper provided at an axial end portion of the first conveyance roller, projecting radially beyond a circumferential surface of the first conveyance roller, downstream rollers positioned downstream from the first and second conveyance rollers in a sheet conveyance direction, an engaging and disengaging unit to disengage the first and second conveyance rollers from each other, and a controller. The first stopper rotates to a contact position projecting into the sheet conveyance path and to a non-contact position away from the sheet conveyance path as the first conveyance roller rotates. The first stopper moves to the non-contact position after stopping a sheet. The first and second conveyance rollers are disengaged from each other after a leading end of the sheet reaches the downstream rollers, before the first stopper moves to the contact position.