Ricoh Company, Ltd.

Hitachi Koki Co., Ltd.

International Business Machines Corporation

Ricoh Printing Systems, Ltd.

Junji Shirakawa

Yutaka Shoji

Takayuki Muneyasu

Masayuki Ainoya

Makoto Nakura

Hiroshi Suzuki

Kazuo Uno

Takeshi Watanabe

Kazuo Sunou

Kenji Ishii

Yoshitaka Fujinuma

Minoru Seino

Yuji Karikusa

Masato Yamada

Mamoru Takayama

Koji Kato

Seiichi Mori

Masahiro Yamazaki

Hideki Ishida

Takashi Suzuki

Susumu Mikajiri

Koji Kawahara

Hiroshi Takahagi

Yuichiro Suzuki

Junichi Kawase

Yasuyuki Sekino

Hirofumi Ohkushi

Junichi Suzuki

Kimio Nakamura

Hideki Ando

Takeyuki Ishihara

Tesuo Kanno

Takahiro Kikuchi

Shogo Nobumori

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.

Sheet conveyor and image forming apparatus incorporating the sheet conveyor

A sheet aligning device may include a sheet conveyance path; a detecting unit configured to detect a side edge of a sheet being conveyed in the sheet conveyance path; a stopper on an upstream side of the detecting unit and configured to open/close so as to allow/prevent passage of the sheet and to position a leading edge of the sheet; a first conveying unit on an upstream side of the stopper, the first conveying unit including a pair of first rollers configured to come in contact with/separate from each other; a second conveying unit on an upstream side of the first conveying unit, the second conveying unit including a pair of second rollers configured to come in contact with/separate from each other; and a horizontal movement unit configured to move the pair of first rollers in an axial direction based on a detection result output by the detecting unit.

Sheet aligning device and image forming apparatus including the same

A belt member is supported by a plurality of rollers and moves in a predetermined moving direction. A detecting unit detects a displacement of the belt member in its width direction. A correcting unit moves a second end of a first roller from among the rollers in either one of a forward direction and a backward direction while fixing its first end based on a result of detecting the displacement of the belt member such that a tilt of a rotating shaft of the first roller is changed to correct a meandering of the belt member. An adjusting unit adjusts a fixing position of the first end.

Belt device and image forming apparatus

A pressing mechanism that presses a contact unit, which is brought into contact with a contact target unit against the contact target unit, includes a holding unit that holds the contact unit. The holding unit includes two first portions that are arranged at both ends of the holding unit in its width direction away from the contact unit and are biased toward the contact target unit and a second portion that is arranged at approximately a center in the width direction sandwiching the contact unit with the first portions and supports the holding unit.

Pressing mechanism, transfer device, and image forming apparatus

An image forming apparatus includes a belt-shaped image carrier that carries an image, an image transfer unit that transfers the image onto a recording medium, and a conveying unit that conveys the recording medium to the image transfer unit. The image carrier has a sloping surface that slopes down from an upstream of the image transfer unit in a conveying direction. The conveying unit includes a linear conveying path that is arranged an upstream of the image transfer unit in the conveying direction, below the sloping surface and above a horizontal line passing through the image transfer unit.

Image forming apparatus

A disclosed image forming apparatus includes an image transferring unit configured to transfer an image to a recording medium; a fusing unit provided downstream of the image transferring unit and configured to fuse the image transferred by the image transferring unit with the recording medium; a recording medium conveying unit provided between the image transferring unit and the fusing unit and configured to convey the recording medium from the image transferring unit to the fusing unit; a conveyance failure detecting unit configured to detect a conveyance failure of the recording medium; and a recording medium evacuation unit to which the recording medium can be evacuated in the event that the conveyance failure detecting unit detects the conveyance failure. Plural recording medium evacuation units are provided and plural recording media can be evacuated to each of the recording medium evacuation units.

A disclosed sheet aligning device includes a sheet conveyance path; a detecting unit configured to detect a side edge of a sheet being conveyed in the sheet conveyance path; a stopper provided on an upstream side of the detecting unit and configured to open/close in such a manner as to allow/prevent passage of the sheet through the sheet conveyance path and to position a leading edge of the sheet being conveyed in the sheet conveyance path; a first conveying unit provided on an upstream side of the stopper, the first conveying unit including a pair of first rollers configured to come in contact with/separate from each other; a second conveying unit provided on an upstream side of the first conveying unit, the second conveying unit including a pair of second rollers configured to come in contact with/separate from each other; and a horizontal movement unit configured to move the pair of first rollers in an axial direction of the first rollers based on a detection result output by the detecting unit.

A disclosed image forming apparatus includes a main conveyance path configured to convey a recording medium from a paper feeding unit to a sheet discharge unit; a double-side reversing conveyance path configured to switch back a recording medium, one side of which has an image formed, so as to reverse the sides of the recording medium for double-sided image formation; a sheet resending conveyance path configured to resend the recording medium reversed in the double-side reversing conveyance path to the main conveyance path; and a double-side reversing open-space unit configured to provide a space for switching back the recording medium on the double-side reversing conveyance path. The double-side reversing open-space unit also serves as a temporary tray for storing misfed recording media and remaining recording media left inside the image forming apparatus when a jam occurs.

Disclosed is an image forming apparatus that includes a recording medium feeding unit that feeds a recording medium to a predetermined conveyance path; a conveyance unit that conveys the recording medium fed from the recording medium feeding unit on the conveyance path; a conveyance status detection unit that detects a conveyance status of the recording medium placed on the conveyance path; a control unit that controls operations of the recording medium feeding unit, the conveyance unit, and the conveyance status detection unit; and an accommodation unit that accommodates the recording medium. The control unit controls the feeding of the recording medium with the recording medium feeding unit and the conveyance of the recording medium with the conveyance unit based on a detection result of the conveyance status detection unit, thereby discharging the recording medium present in the image forming apparatus to the accommodation unit.

Image forming apparatus which continues to convey a sheet if the sheet is only slightly delayed

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.

Sheet conveyance unit and image forming apparatus including same

Belt device and image forming apparatus having a belt correcting unit and an adjusting unit

A first longitudinal registration correcting unit corrects a misalignment of a recording medium in its conveying direction. A lateral registration correcting unit corrects a misalignment of the recording medium in its width direction after the misalignment in the conveying direction is corrected by the first longitudinal registration correcting unit. A second longitudinal registration correcting unit corrects the misalignment of the recording medium in the conveying direction again after the misalignment in the width direction is corrected by the lateral registration correcting unit.

Conveying device and image forming apparatus

A disclosed image forming apparatus includes a transport unit configured to transport a recording medium along a transport path, a transport status detection unit disposed on the transport path and configured to detect a transport status of the recording medium, a control unit configured to control transport by the transport unit according to the transport status of the recording medium detected by the transport status detection unit, and a container unit configured to hold the recording medium. If the transport status detection unit detects a delay in transporting the recording medium, the control unit controls the transport unit to discharge the recording medium or another recording medium in the transport path into the container unit.

Image forming apparatus having a transport status detection unit

A moving unit includes first and second transportation paths that can selectively link to main transportation path of a recording sheet, a first roller arranged between the first and the second transportation paths, second and third rollers capable of making contact with the first roller across the first and the second transportation paths, respectively. When the moving unit moves to a position at which the first transportation path or the second transportation path is linked to the main transportation path, a mechanism varies a pressing force of the second roller or the third roller with respect to the first roller.

Growing community of inventors

Ibaraki, Japan

Junji Shirakawa