Ricoh Company, Ltd.

Kohjiroh Haga

Hidetoshi Kojima

Yasuo Niikura

Takashi Fukumoto

Kazunori Konno

Hideaki Takahashi

Munehisa Fuda

Tatsuya Sugawara

Toshihiro Okutsu

Kiyotake Nakamura

Hisayoshi Sugawara

Yuuta Mori

Junya Suzuki

Ryo Takahashi

Kei Sasaki

Kiichiro Goto

Takamasa Matsumoto

Youhei Niitsuma

Satoru Takano

Shintaro Matsumoto

Masato Hashimoto

Yasushi Tsuruoka

Masaki Ishizaki

Masahiro Tamura

Takahiro Watanabe

Tomohiro Furuhashi

Shuuya Nagasako

Akira Kunieda

Keisuke Sugiyama

Tomomichi Hoshino

Kyosuke Nakada

Kazuhiko Kitano

Yasunori Hino

Chikara Akata

Tomoki Tamate

A paper sheet conveyance device includes a plurality of conveyance members and conveys a paper sheet while performing temporary stop of conveying and then restart of conveying. Two paper sheets sequential in a conveyance direction stop together in a state of the temporary stop, driving a first transfer member to which a preceding first paper sheet that is one of the two paper sheets is opposed and a second conveyance member to which a following second paper sheet that is the other paper sheet is opposed is stopped and restarted synchronously for the temporary stop and the restart. A stop position information acquisition unit acquires information on a position on the conveyance path at which the second paper sheet stops in the state of the temporary stop, and a timing for stopping the conveying after the conveying is restarted is controlled according to the acquired information.

Paper sheet conveyance device and image forming apparatus

A sheet separating device includes: a lifting nozzle configured to blow air against an end portion of a sheet bundle placed on a sheet loading portion to lift sheets; a separating nozzle configured to separate the sheets; a lifting-nozzle shutter member configured to open and close the lifting nozzle; a separating-nozzle shutter member configured to open and close the separating nozzle; a lifting-shutter driving mechanism configured to drive the lifting-nozzle shutter member; a separating-shutter driving mechanism configured to drive the separating-nozzle shutter member; and an open/close control unit configured to control the lifting-shutter driving mechanism and the separating-shutter driving mechanism such that the lifting-nozzle shutter member and the separating-nozzle shutter member are opened or closed simultaneously.

Sheet separating device, sheet supplying device, and image forming apparatus

A paper feeding apparatus includes: a sheet loading unit for loading a bundle of sheets; a separation unit that separates a topmost sheet of the bundle of sheets loaded on the sheet loading unit, from the bundle of sheets; a conveyance unit that conveys the separated topmost sheet; an end fence that is movable in a sheet conveyance direction, abuts trailing ends in the sheet conveyance direction, and positions the bundle of sheets in the sheet conveyance direction; and a pressing unit that is provided in such a manner as to protrude from the end fence, and is able to press the trailing ends in the sheet conveyance direction of at least an upper part of the bundle of sheets, wherein the pressing unit has different pressing forces at an upper and a lower portion thereof, and has the lower pressing force stronger than the upper pressing force.

Paper feeding apparatus, image forming apparatus, image forming system

Provided are a floating restricting member restricting the floating position of a bundle of sheets; and a holding mechanism holding the floating restricting member relative to a side fence. The floating restricting member includes a sheet contact section being brought into contact with the sheets from above; and a sheet-floating restricting section restricting the floating position of the floating sheet that is floated while air is blown thereto. The holding mechanism sets the floating restricting member in the initial state where the sheet-floating restricting section restricts the floating position of the sheet, in the sheet-placing time retracted state where the sheets are pushed against the sheet contact section so that the floating restricting member is retracted, and in the sheet-ejecting time retracted state where, when the sheets are to be removed, the sheet is pushed against the sheet contact section from below so that the floating restricting member is retracted.

Sheet feeding device, image forming apparatus, and image forming system

A sheet discharging device includes a shift trayon which a sheet Pis stacked, a discharging rollerthat discharges a sheet Ponto the shift tray, a blowing devicethat sends air to a lower surface of the sheet Pdischarged by the discharging roller, a blocking memberthat blocks air sent to the lower surface of the sheet Pfrom a blowing port-of the blowing device, and a control unit that controls the blocking amount of the blocking member. The blocking amount is determined based upon sheet information including sheet-type information, sheet-size information, and sheet-thickness information, for example.

Sheet discharging device, image forming system, and sheet discharging method

A sheet feeding device includes: a sheet feeding tray attached to a casing in a manner slidable into and out from the casing and including a stacking plate on which sheets are stacked; a conveying unit configured to convey the sheets in a direction orthogonal to both a sliding direction of the sheet feeding tray and a stacking direction of the sheets; an optional extension unit configured to be removably attached to an upstream side of the stacking plate in a conveying direction, and including an extension plate configured to extend the stacking plate; and a first locking unit configured to be capable of being held in a first lock position where the sheet feeding tray cannot be slide when the optional extension unit is attached while, when the optional extension unit is removed, held in a first unlock position where the sheet feeding tray can be slid.

Sheet feeding device and image forming apparatus

A sheet feeding device includes: a sheet stacking member; an air blowing unit configured to blow air onto the sheet bundle placed on the sheet stacking member to suspend multiple sheets of the sheet bundle; a lifting/lowering unit configured to lift/lower the sheet stacking member; an optical reflection sensor configured to detect a suspended sheet suspended by the air blowing unit; and a control unit configured to control the lifting/lowering unit based on an output value of the optical reflection sensor. The optical reflection sensor is configured to be capable of detecting an area corresponding to multiple sheets in a sheet suspension zone extending between a non-suspended sheet bundle and a conveying member configured to convey an uppermost sheet of the multiple suspended sheets. The non-suspended sheet bundle is made up of sheets not suspended during a period when air is blown by the air blowing unit.

A sheet discharging device includes a shift trayon which a sheet P1 is stacked, a discharging rollerthat discharges a sheet P2 onto the shift tray, a blowing devicethat sends air to a lower surface of the sheet P2 discharged by the discharging roller, a blocking memberthat blocks air sent to the lower surface of the sheet P2 from a blowing port-of the blowing device, and a control unit that controls the blocking amount of the blocking member. The blocking amount is determined based upon sheet information including sheet-type information, sheet-size information, and sheet-thickness information, for example.

A sheet stacking apparatus including: a discharge unit configured to discharge a sheet through a discharge port; a stack unit configured to stack the discharged sheet thereon; and a plurality of blowing units configured to supply air to a discharge side of the discharge unit while the sheet is discharged, wherein the blowing units are disposed, below the discharge port, aligned with a direction perpendicular to a sheet discharge direction.

Sheet stacking apparatus, image forming system and sheet stacking method

A sheet stacking device includes: a stacking unit that stacks thereon a sheet discharged in a sheet discharging direction; a conveying unit that performs a moving-back operation of conveying the stacked sheet in a direction opposite to the sheet discharging direction; a pressing unit that performs a pressing operation of pressing the conveyed sheet; and a driving unit that drives the conveying unit and the pressing unit by a same driving source.

Sheet stacking device, image forming system, and sheet stacking method

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Kanagawa, Japan

Kohjiroh Haga