Ricoh Company, Ltd.

Yoshihiro Asano

Takahisa Koike

Minoru Takahashi

Takuya Murata

Hideyuki Takayama

Motoharu Takahashi

Masahiro Ashikawa

Shingo Nagatsuka

Kentaroh Kurosu

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

An electronic apparatus includes: a unit part that can be pulled out of a main unit; a cover part that is configured to, when being close, cover the unit part; a lock part that, when the cover part is being open, is movable to a first position where it is possible to pull the unit part out of the main unit and is movable to a second position where it is impossible to pull the unit part out of the main unit; a detection unit configured to, when being supplied with power, detect an internal state of the unit part; and a first power supply unit configured to shut off power supply to the detection unit when the lock part is moved to the first position, and supply power to the detection unit when the lock part is moved to the second position.

Image forming apparatus with separate interlocks for motors and sensors

An image forming apparatus and a method of controlling an image forming apparatus, and a non-transitory recording medium storing a program for controlling an image forming apparatus are provided. Each of the image forming apparatus, the method, and the program obtains and stores image identifiers, obtains and stores a passing image identifier for identifying an image to be output to a recording medium to which failure has occurred, transfers a developer image to the recording medium, holds the developer image, presses the recording medium against the holding member, generates and obtains a trigger signal used for determining timing at which a developer image reaches a transfer unit, detects an error in conveyance of the recording medium, and creates a gap between a holding member and a pressing member disposed opposite the holding member when an error is detected in conveyance of the recording medium.

Image forming apparatus, image forming apparatus control method, and recording medium storing image forming apparatus control program

A sheet conveying device includes a conveying roller provided on an inner side of a curved part of a conveying path of a sheet; a driving unit configured to rotate the conveying roller; a drive control unit configured to control a rotation speed of the conveying roller by the driving unit; a rotation speed detecting unit configured to detect the rotation speed of the conveying roller; a conveying unit configured to convey the sheet laid across the conveying roller and the conveying unit; a conveying speed detecting unit configured to detect a conveying speed of the sheet; and a sheet thickness detecting unit configured to detect a thickness of the sheet based on the conveying speed of the sheet detected by the conveying speed detecting unit and the rotation speed of the conveying roller detected by the rotation speed detecting unit.

Sheet conveying device, image forming apparatus, sheet thickness detection system

A rotating mechanism driving apparatus is disclosed that includes a frictional transmission configured to output torque via a viscous fluid, the torque being input from the motor; an input shaft rotational amount detecting part configured to detect a rotational amount of an input shaft of the frictional transmission; an output shaft rotational amount detecting part configured to detect a rotational amount of an output shaft of the frictional transmission; an input torque detecting part configured to detect input torque of the frictional transmission; a slip amount calculating part configured to calculate a slip amount between the input shaft and the output shaft; and abnormal state determining part configured to determine abnormal state of a rotating mechanism connected to the output shaft of the frictional transmission based on the input torque and to determine an abnormal state of the frictional transmission based on the slip amount.

Rotating mechanism driving apparatus, image forming apparatus, non-transitory readable medium in which computer program for executing method for driving the rotating mechanism is recorded, rotating mechanism driving system and image forming system

An intermediate transfer device including an intermediate transfer body having a primary transfer portion and a secondary transfer portion which bears a secondary image formed by transferring a primary image from an image bearing member; a pair of secondary transfer rollers having a secondary transfer roller and a support roller provided in contact with each other via the intermediate transfer body at the secondary transfer portion, which transfers the secondary image to a recording medium at the secondary transfer portion; a variation detection device that detects an amount of variance occurring to a transfer rotation body when the recording medium is transferred to the secondary transfer portion; and an adjustment device that adjusts the distance between the pair of the secondary transfer rollers according to the amount of variance detected by the variation detection device.

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Kanagawa, Japan

Yoshihiro Asano