Brother Kogyo Kabushiki-Kaisha

Mitsuhiro Nozaki

Shigeki Akiyama

Kenta Horade

Kenji Samoto

Kohei Terada

Hirotaka Aoki

Tomoaki Hazeyama

Kenichi Iesaki

Masaru Takeuchi

Masatoshi Kokubo

Kazushige Muroi

A sheet transporting apparatus is provided, including a transport mechanism provided with a roller, a motor, a controller, and a measuring input unit, wherein a transport route has a curved area for inverting the sheet, and the controller is constructed such that the control on the motor is executed by a closed loop control system by using a measured value of an control output at an initial stage of the transport of a sheet from a tray, and the control on the motor is switched from the control performed by the closed loop control system to control performed by an open loop control system on condition that a preset phenomenon arises after the sheet is taken out of the tray.

Sheet transporting apparatus and image forming system

A transporting apparatus includes a motor, a transporting mechanism which receives a power from the motor and transports the sheet, and a control section which controls the motor in accordance with a predetermined control sequence to make the transporting mechanism transport the sheet up to a target position, and detects an occurrence of an electric-current saturation phenomenon in the motor. When the control section detects the occurrence of the electric-current saturation phenomenon, the control section performs correction of the predetermined control sequence including correction in which a target transporting velocity of the sheet is lowered from a predetermined value determined in the predetermined control sequence, and controls the motor in accordance with the corrected control sequence to make the transporting mechanism transport the sheet so that the sheet is stopped at the target position.

Transporting apparatus

A sheet feeding device includes: a feeding mechanism having a first roller and a second roller provided downstream in a sheet feeding path from the first roller and feeding a sheet by rotations of the first and second rollers; a control section executing a butting control by controlling the first and second rollers to feed the sheet from the first roller so as to butt against the second roller at an intake position, and executing an intake feeding control by controlling the second roller to feed the sheet downstream in the feeding path from the intake position; an obtaining section obtaining information indicating a rotation amount of the second roller in a period after the butting control to the start of the intake feeding control; and a target setting section setting a target rotation amount of the second roller that should be achieved in the intake feeding control.

Sheet feeding device and image forming system

An image reading apparatus including a reading unit that reads a document as an object to be read in a main scanning direction; a conveyance unit that conveys one of the reading unit and the object to be read as an object to be conveyed in a sub-scanning direction; a detecting unit that detects a position of the object to be conveyed; a control unit that controls conveyance of the object to be conveyed, based on the position of the object to be conveyed and a preset target position trajectory; a specifying unit that specifies, based on the target position trajectory, the position of the object to be conveyed at a time when a period of invalidation or interruption of reading operation by the reading unit is started. The reading operation is invalidated or interrupted when a predetermined interruption condition is satisfied.

Image reading apparatus

An image forming apparatus comprises: an image forming mechanism including a motor, and an image forming unit which operates by the motor to form an image on a recording sheet; a registration unit which registers a job; a control unit which controls the image forming mechanism to form an image corresponding to the job registered through the registration unit on a recording sheet; a number obtaining unit which obtains the number of recording sheets required for the job registered through the registration unit; and a setting unit which sets a rotation speed of the motor according to the number of recording sheets obtained by the number obtaining unit. The control unit controls the image forming mechanism to form the image corresponding to the job registered through the registration unit on the recording sheet by rotating the motor at the rotation speed set by the setting unit.

Image forming apparatus

An electronic device includes a carriage conveyance unit, a sheet conveyance unit, a failure detection unit, a position detection unit, and a jam determination unit. The carriage conveyance unit includes a motor and conveys a carriage in a main scanning direction by a driving force of the motor. The sheet conveyance unit conveys a sheet in a sub-scanning direction which crosses the main scanning direction in which the carriage is conveyed. The failure detection unit detects a conveyance failure of the carriage. The position detection unit detects a position of the carriage in the main scanning direction. The jam determination unit determines whether or not the conveyance failure is due to jamming caused by interference between the carriage and the sheet, based on the position of the carriage detected by the position detection unit at a time when the conveyance failure is detected by the failure detection unit.

Electronic device

An apparatus includes: a reading unit performing a reading operation whenever a line start signal is input thereto; a transport unit transporting anyone of the reading unit and the reading target document; an encoder outputting an encoder signal whenever a transport target is moved by a predetermined distance; a control unit transmitting the line start signal to the reading unit; a time measuring unit measuring a time elapsed from a time point when the line start signal was last transmitted; a cycle measuring unit measuring an output time interval of the encoder signal, as an encoder cycle; and a storage unit storing the latest encoder cycle, wherein the control unit transmits the line start signal to the reading unit whenever the elapsed time is equal to or greater than a time obtained by multiplying a value of the encoder cycle by a correction coefficient determined by a ratio R/R

A conveyance device includes a linear encoder that outputs an encoder signal corresponding to displacement of a conveyed object. The encoder includes an encoder fence provided on an intersecting plane that intersects a reference plane orthogonal to a direction in which a guide element supports the conveyed object. The encoder fence is configured such that a plurality of light-transmitting portions and light-shielding portions are arranged alternately on a side of the encoder fence. The light-transmitting portions and the light-shielding portions are formed so that a first point on each boundary between each of the light-transmitting portions and each of the light-shielding portions adjacent to each other and a second point on the each boundary, which is positioned separately from the first point with respect to a direction along the side of the encoder fence and perpendicular to the conveying direction, are separately positioned with respect to the conveying direction.

Conveyance device and image forming apparatus

A motor control method includes the steps of: measuring a time period from an output of a drive detection signal to a next output of a drive detection signal; storing the measurement result at each time of output of a drive detection signal as a measured cycle; calculating a driven velocity of the driven object based on the stored measured cycle; calculating an operation amount of the motor such that the calculated driven velocity is equal to a predetermined target velocity. In the motor control method, it is determined, at each calculation timing, whether or not the driven object is in a low velocity state where an actual velocity is lower than the target velocity. When determined affirmative, calculation of the driven velocity of the driven object is performed based on a measured value being currently measured at the calculation timing in place of the stored measured cycle.

Motor control method and motor control apparatus

An inkjet recording apparatus of a serial recording type which comprises a recording head, a carriage and a conveying device. The recording head is capable of selectively ejecting ink toward a recording medium. The carriage with the recording head mounted thereon reciprocatingly moves in specified directions. The conveying device intermittently conveys the recording medium in a direction perpendicular to the specified directions when the recording head does not eject ink. An image is recorded on the recording medium by repeatedly performing, in turn, movement of the carriage and ejection of ink by the recording head, and intermittent conveyance of the recording medium by the conveying device. The inkjet recording apparatus also includes a vibration applying device that vibrates at least one of the recording medium and the recording head when the recording head ejects ink toward the recording medium while the carriage is being moved.

Inkjet recording apparatus

The conveyance control device includes a detector that detects the conveyance distance of an object by a conveyance device, a section determiner that determines to which section within an object a reference point of the object belongs, and a target setter, based on a determination result of the section determiner, sets the target conveyance speed corresponding to the section to which the reference point belongs. Based on a detection result of the detector, the operation amount calculation sequentially calculates the operation amount of the conveyance device. The conveyance controller provides a control signal corresponding to the operation amount calculated by the operation amount calculator for the conveyance device and makes the conveyance device convey the object to move a reference point of the object from the conveyance start point to the conveyance destination at a speed corresponding to the target conveyance speed.

Conveyance control device, conveyance system and image forming system

The control device includes a target setter that sets the target travel distance of the driving object in every predetermined period when the driving object is moved, and an operation amount determiner that determines whether or not the operation amount calculated by the operation amount calculator is equal to or more than a predetermined upper limit. The target setter sets the target travel distance according to a first rule when the operation amount is determined by the operation amount determiner to be less than the upper limit. When the operation amount is determined to be equal to or more than the upper limit by the operation amount determiner, the target setter sets according to a second rule.

Control device, conveyance control device, conveyance system and image forming system

An apparatus for controlling an electric motor provided to drive a movable object such that a detected actual amount of motion of a movable portion of the electric motor or the movable object coincides with a target amount, comprising:

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Nagoya, Japan

Mitsuhiro Nozaki