Canon Kabushiki Kaisha

Toshiyuki Iwata

Hideki Kushida

Naoto Tokuma

Yusuke Obuchi

Rikiya Takemasa

Kiyoshi Watanabe

Daisaku Kamiya

Toshiki Momoka

Yohei Gamo

Hideto Abe

Hitoshi Fujimoto

Akito Sekigawa

A sheet conveyance apparatus includes a sheet conveyance unit, a double feeding detection unit, a first sheet detection unit, and a control unit. The double feeding detection unit detects double feeding with respect to a sheet. The control unit controls a conveyance speed of a sheet conveyed by the sheet conveyance unit at a first speed and a second speed which is slower than the first speed and at which the sheet is in motion. The control unit controls the sheet conveyance unit to decelerate the conveyance speed of a sheet conveyed by the sheet conveyance unit from the first speed to the second speed based on a detection result of the first sheet detection unit. The control unit controls the double feeding detection unit to execute a double feeding detecting operation with respect to the sheet that is conveyed at the second speed by the sheet conveyance unit.

Sheet conveyance apparatus and image forming apparatus

A sheet processing apparatus includes a first stacking portion on which a sheet conveyed by a conveying portion is stacked, a binding portion which forms, in a sheet bundle stacked on the first stacking portion, a tongue cut out from the sheet, with a part of the tongue attached to the sheet, and a slit, and which binds the sheet bundle by inserting a tip of the tongue of the sheet bundle in the slit of the sheet bundle, and a second stacking portion on which the sheet bundle bound by the binding portion is stacked. In the sheet processing apparatus, a plurality of recessed parts is formed on a guide face of the binding portion, the recessed parts extending in different directions from each other.

Sheet processing apparatus and image forming apparatus

A sheet processing apparatus includes a sheet conveying portion conveying a sheet to a sheet stacking portion; a regulating portion regulating a position of the sheet on the stacking portion; a rotary member pair having first and second rotary members and conveying the sheet toward the regulating portion through rotation in a first direction, and conveying a bound sheet bundle through rotation in a second direction opposite to the first direction; a moving portion moving the second rotary member to a separation position after the rotary member pair conveys the sheet, and moving the second rotary member to a nipping position before the rotary member pair conveys the sheet bundle; and a control portion controlling to rotate the rotary member pair in the second direction after the second rotary member is moved to the separation position and before the second rotary member is moved to the nipping position.

Sheet processing apparatus and image forming apparatus with rotary member to convey sheets

Provided is a sheet stacking apparatus including a discharge roller pair, a stacking tray, a tray drive motor, a sheet surface detecting sensor detecting a position of a topmost sheet on the stacking tray, an alignment portion including front and rear alignment members which are provided above the stacking tray and sandwiching a sheet to align, and a finisher control portion executing: raising/lowering control for raising and lowering the stacking tray so that the topmost sheet is located at a predetermined height in accordance with a detection result obtained from the sheet surface detecting sensor; alignment control for aligning the sheet when the sheet is discharged; and alignment stop control for stopping the alignment of the alignment portion in the case that a movement amount of the stacking tray, at the time when the stacking tray moves in accordance with the detection result, exceeds a predetermined movement amount.

Sheet stacking apparatus and image forming apparatus

A sheet storage device is equipped with sheet storage portions which are provided in an upper portion of a copying machine body and receive sheets, conveyed in sequence from the copying machine body, from downward and store the sheets in such a state that the sheets stand. The sheet storage portions are relatively rotatably supported in sequence and parallel. Each sheet storage portion receiving the sheet from the copying machine body is rotated to be held in the rotational position.

Sheet storage device and image forming apparatus

After a sheet has once passed through a punching position, a conveyance roller pair conveys the sheet backward to the punching position. A lateral registration detection sensor detects a side edge position of the sheet in a width direction. When a sheet processing apparatus corrects the side edge position of the sheet by controlling a shift unit for moving the sheet in the width direction so as to correct the side edge position of the sheet, the sheet processing apparatus sets a shifting amount of the sheet to a value that is a predetermined amount greater than a shifting amount required to correct the side edge position of the sheet according to the side edge position of the sheet detected by the lateral registration detection sensor. After the sheet has passed through the die hole the sheet processing apparatus sets the shifting amount to the required value.

Sheet processing apparatus having punch unit, and image forming apparatus

A sheet conveyance apparatus includes a shift unit which includes a conveyance roller pair capable of being placed in a contact state and a separation state and configured to convey sheets having an overlapping portion where a rear end portion of a preceding sheet and a front end portion of a following sheet overlap each other. The shift unit is movable in a widthwise direction while conveying the sheets by the conveyance roller pair. The sheet conveyance apparatus moves the shift unit in the widthwise direction when it is determined that the overlapping portion of the sheets has reached the conveyance roller pair.

Sheet conveyance apparatus and image forming system

There are provided a sheet stacking apparatus capable of stably stacking a large number of sheets and an image forming apparatus. The sheet stacking apparatus configured to stack sheets includes a plurality of discharge units disposed to an apparatus main body in a vertical direction and configured to discharge sheets, a plurality of sheet stacking units disposed to be independently elevatable on a side surface of the apparatus main body corresponding respectively to the plurality of discharge units and configured to stack thereon the sheets discharged from the discharge units, and an alignment unit disposed between the plurality of sheet stacking units and configured to sequentially align a position in a width direction perpendicular to a discharging direction of the sheets stacked on a lower sheet stacking unit among the plurality of sheet stacking units.

A finisherincludes a pair of bundle discharge rollers, a lower stack tray, and a width-direction aligning portion. The width-direction aligning portion includes a pair of aligning membersand a driving motor. The aligning member includes a pair of first aligning membersthat is rotatably supported while being movable in the sheet width direction orthogonal to the discharge direction and a pair of second aligning members. The driving motor rotates the pair of first aligning members and moves the pair of first aligning members in the width direction. When the pair of first aligning members rotates and one of the pair of second aligning members abuts on the sheet, the pair of second aligning members forms opposite surfaces in which the sheet can be aligned in the width direction, and the pair of first aligning members align the sheet by the opposite surfaces.

A sheet storage apparatus having a sheet conveying portion and a sheet storage portion to receive the sheet as conveyed upward from below by the sheet conveying portion and to store the sheet in a vertical direction. The sheet storage portion includes a guide portion, first and second holding members. The first holding member forms a first nipping portion between the first holding member and the guide surface. The first holding member permits the sheet to be conveyed upward to pass through the first nipping portion, and holds the sheet by restricting the sheet from moving downward at the first nipping portion. The second holding member forms a second nipping portion between the second holding member and the guide surface. The second holding member permits the sheet to be conveyed upward to pass through the second nipping portion, and holds the sheet at the second nipping portion.

Sheet storage apparatus and image forming apparatus

A sheet processing apparatus capable of improving sheet processing performance and productivity is provided. While sheets are conveyed in a piled state toward a rear-end stopper, displacement is produced between the sheets by a pair of discharge rollers. Even if adhesion occurs between the sheets during conveyance thereof, the adhesion between the sheets can be removed before the sheets come into contact with the rear-end stopper.

Sheet processing apparatus and image forming apparatus including same

A conveying roller conveys a sheet. A sheet holding portion receives a sheet from below and holds the received sheet with keeping its forward end upward and its rear end downward. The sheet holding portion has: a storing guide provided in a vertical state and having a guide surface configured to guide the received sheet upward; a conveying guide provided to face the guide surface and having a curved surface portion whose distance from the guide surface increases in the upward direction; and a holding member provided between the guide surface and the curved surface portion and configured to roll on the curved surface portion toward the guide surface to nip the received sheet with the guide surface. An inclination angle of the curved surface portion with respect to the guide surface decreases with distance from the guide surface.

Sheet storing apparatus and image forming apparatus

A sheet processing apparatus includes a processing tray configured to stack a sheet to be processed, a sheet overlap unit configured to allow a sheet fed while the sheet to be processed is stacked on the processing tray, to be overlaid and made to wait, first and second bundle conveyance rollers configured to convey the sheet to the processing tray from the sheet overlap unit, and a sheet processing apparatus control unit configured to control an overlap operation in the sheet overlap unit, wherein the sheet processing apparatus control unit determines, based on sheet information relating to the sheet fed to the sheet overlap unit, whether a sheet to be then fed is overlaid on the sheet fed to the sheet overlap unit.

After a sheet has once passed through a punching position where punching processing is performed, a conveyance roller pair conveys the sheet backward to the punching position. A lateral registration detection sensor detects a side edge position of the sheet in a width direction. When a sheet processing apparatus corrects the side edge position of the sheet by controlling a shift unit configured to move the sheet in the width direction so as to correct the side edge position of the sheet, the sheet processing apparatus sets a shifting amount of the sheet to a value that is a predetermined amount greater than a shifting amount required to correct the side edge position of the sheet according to the side edge position of the sheet detected by the lateral registration detection sensor. After the sheet has passed through the die hole in the backward movement toward the punching position, the sheet processing apparatus sets the shifting amount to the required value.

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Abiko, Japan

Toshiyuki Iwata