Ricoh Company, Ltd.

Oki Data Corporation

Motoharu Takahashi

Yuichiro Maeyama

Tomohiro Egawa

Takuya Murata

Masahiro Ashikawa

Yoshihiro Asano

Shingo Nagatsuka

Kentaroh Kurosu

Hideaki Suzuki

Yoshihiro Takahashi

Minoru Takahashi

Yusuke Ishizaki

Eri Uchida

Takaaki Kaneko

Daisuke Momose

Yuuya Mizuguchi

A sheet conveying device includes a sensor, a corrector, and circuitry. The sensor detects a position of a first sheet and multiple second sheets. The corrector corrects the position of the sheet in at least one of a rotational direction or a width direction. The circuitry is to convey the multiple second sheets at a first conveyance speed, reduce the first conveyance speed of a preceding one of the multiple second sheets to a second conveyance speed until a space between the preceding one and a subsequent one of the multiple second sheets becomes a difference between a first length of the first sheet and a second length of the multiple second sheets, and cause the corrector to convey one of the multiple second sheets at the second conveyance speed within at least a part of time in which said one of the multiple second sheets is conveyed.

Sheet conveying device and image forming apparatus incorporating the sheet conveying device

A conveying device includes a conveyor, a detector, and circuitry. The conveyor conveys a recording medium in a conveyance direction. The detector detects a skew amount and a shift amount of a posture of the recording medium to be sent to the conveyor and detects, in parallel, end positions of the recording medium in a width direction of the recording medium intersecting with the conveyance direction, at at least three different points in the conveyance direction on one end of the recording medium in the width direction. The circuitry controls an operation of the conveyor and causes the detector to detect a corner folded portion of the recording medium based on the end positions of the recording medium in the width direction detected at the at least three different points.

Conveying device and image forming apparatus

A belt driving device includes an adjustment roller to stretch and rotate an endless belt; an inclination adjuster including a cam to adjust inclination of the roller to control deviation of the belt; a belt position detector to detect a belt position in a direction orthogonal to a movement direction of the belt; a stepping motor to rotate the cam; and a control output adjuster to adjust a control output to be supplied to the motor based on the belt position. When obtaining a rotation angle less than one step of the motor, the control output adjuster supplies the control output to the motor for a time corresponding to the rotation angle less than the one step out of a supply time of the control output for obtaining a rotation angle of the one step, and stops supplying the control output for a remaining time out of the supply time.

Belt driving device, belt driving method, and image forming apparatus

A sheet conveying device, which is included in an image forming apparatus, includes a plurality of position detectors, a leading end detector, and a position adjuster. The plurality of position detectors is configured to detect a position of a sheet. The leading end detector is configured to detect a leading end of the sheet. The position adjuster is configured to, based on a detection result obtained by the plurality of position detectors, rotate in a rotation direction of the sheet within a plane of conveyance of the sheet to change the position of the sheet the position adjuster grips the sheet under conveyance to cause the leading end detector to rotate with the position adjuster in the rotation direction of the sheet within the plane of conveyance of the sheet.

A sheet conveying device includable in an image forming apparatus that uses a method of conveying a conveyance target medium and a method of forming an image, includes a position detector, a position adjuster, and circuitry. The position detector is configured to detect a position of a conveyance target medium. Based on a detection of the position of the conveyance target medium by the position detector, the position adjuster moves in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of conveyance of the conveyance target medium and repeatedly adjusts the position of the conveyance target medium while conveying the conveyance target medium. The circuitry changes a conveying speed of the conveyance target medium, according to a change of the position of the conveyance target medium after adjusted by the position adjuster.

Sheet conveying device, image forming apparatus incorporating the sheet conveying device, method of conveying conveyance target medium, and method of forming image on conveyance target medium using the method of forming image

An image forming apparatus, in which a method of correcting a positional deviation of a sheet is performed, includes a detecting device to detect a position of the sheet, a pair of sheet conveying bodies to convey the sheet and correct the positional deviation of the sheet, an image forming device to form an image on the sheet, and circuitry to calculate a first positional deviation amount of the sheet based on a first detection result of the detecting device, cause the pair of sheet conveying bodies to correct the positional deviation of the sheet based on the first positional deviation amount, calculate a second positional deviation amount of the sheet based on a second detection result of the detecting device, and cause the image forming device to correct the positional deviation of an image forming position on the sheet based on the second positional deviation amount.

Image forming apparatus and method of correcting positional deviation of sheet

A sheet conveying device includes a position detector configured to detect a position of a side end portion of a conveyance target medium, a position adjuster configured to move in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of sheet conveyance, while conveying the conveyance target medium, and adjust a position of the conveyance target medium, according to the position of the side end portion of the conveyance target medium detected by the position detector, a transfer rotary body disposed downstream from the position adjuster in a sheet conveying direction and having a receiver mounted on the rotary body to receive the conveyance target medium, and circuitry configured to change a rotation speed of the transfer rotary body according to the position of the conveyance target medium after adjusted by the position adjuster.

Sheet conveying device, image forming apparatus incorporating the sheet conveying device, sheet conveying method using the image forming apparatus incorporating the sheet conveying device, and image forming method using the image forming apparatus incorporating the sheet conveying device

A sheet conveying device includes a detector configured to detect an attitude of a conveyance target medium, a corrector configured to perform a correcting operation based on a detection result of the detector, and circuitry configured to calculate an angular displacement correction amount and a lateral displacement correction amount of the conveyance target medium, cause the corrector to perform the correcting operation in a direction perpendicular to a sheet conveying direction, based on the lateral displacement correction amount, after the corrector grips the conveyance target medium, and cause the corrector to rotate by the angular displacement correction amount of the conveyance target medium before the corrector grips the conveyance target medium and to perform the correcting operation in a direction of rotation of the conveyance target medium, based on the angular displacement correction amount, after the corrector grips the conveyance target medium.

Sheet conveying device, image forming apparatus incorporating the sheet conveying device, and sheet conveying method using the sheet conveying device

A material conveyor, included in a transfer device of an image forming apparatus and configured to use position control of rotary bodies, includes a first rotary body and a second rotary body disposed opposing each other in an opposing region through which a material is conveyable, and a contact and separation device configured to cause at least a surface, of at least one of the first rotary body and the second rotary body to move, between a separated position and a contact position. The contact and separation device is configured to cause the at least the surface to move from the separated position to the contact position, at a first speed, and then to move at a second speed slower than the first speed. A method of position control includes moving at least the surface at different speeds or based on a distance relative to a threshold distance.

Material conveyor, transfer device incorporating the material conveyor, image forming apparatus incorporating the transfer device, method of position control of rotary bodied, and non-transitory computer readable storage medium

A motor control device for driving a motor, the motor control device includes: a receiver configured to receive, from an external source, a drive command containing a rotation direction command designating a rotation direction of the motor; a storage part configured to store the rotation direction of the motor indicated by the rotation direction command when the motor is driven using the rotation direction command; and a controller configured to, when a new piece of the drive command is received from the external source, control rotation reversing of the motor based on a rotation direction of the motor indicated by the rotation direction command contained in the received piece of the drive command and the rotation direction of the motor stored in the storage part.

Motor control device, driving device, conveyor device, image forming apparatus, motor control method, and computer-readable recording medium

A motor control device includes: an electric-current detection unit configured to detect an electric current that flows through a motor at a time when the motor is not to be driven; a voltage-polarity determining unit configured to determine polarity of a voltage corresponding to the detected electric current; and an operating-state management unit configured to perform control of stopping the motor depending on the polarity of the voltage.

Motor control device, sheet conveying device, and image forming apparatus

A recording medium conveyor includes a first conveyance part conveying a recording medium; a second conveyance part conveying the conveyed recording medium toward a transfer position; a detection part detecting the position of the recording medium conveyed by the second conveyance part; a position error detection part detecting a position error between the transfer position and a position at which there is to be the recording medium when an image reaches the transfer position; a position error storage part storing the detected position errors; a steady-state position error calculation part calculating a steady-state position error from the stored position errors; a first control part controlling the conveyance speed of the first conveyance part to reduce the steady-state position error; and a second control part controlling the conveyance speed of the second conveyance part to reduce the detected position error, with the steady-state position error being reduced.

Image forming apparatus, recording medium conveying method, and image forming system

An image forming apparatus includes an opening-closing lid for opening and closing an opening portion formed in an apparatus main body; a detection unit for detecting an open state of the opening-closing lid; an execution unit for executing a specific operation; a main power source for supplying power to the execution unit; a retaining unit for retaining an open history indicating the open state of the opening-closing lid when the detection unit detects the open state of the opening-closing lid during a period of time when the main power source does not supply power to the execution unit; and a determining unit for determining whether the execution unit executes the specific operation according to the open history retained in the retaining unit when the main power source starts supplying power to the execution unit.

Growing community of inventors

Kanagawa, Japan

Motoharu Takahashi