Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Kei Onishi

Daisuke Yamashita

Koji Imamiya

Satoshi Itaya

An image forming apparatus includes a developing roller, a developing motor, a blade, and a controller. The developing roller includes a sleeve configured to carry a developer that is supplied to an electrostatic latent image held by an image carrier. The developing motor is configured to rotate the sleeve in any one of a first direction or a second direction opposite to the first direction. The blade is configured to regulate a thickness of a layer of the developer that is carried by the sleeve rotating in the first direction with the developing motor. The controller is configured to rotate the sleeve in the second direction with the developing motor until a surface of the sleeve present in a peel-off region of the developer arrives at a facing position facing the blade after development on the electrostatic latent image held by the image carrier ends.

Image forming apparatus

According to one embodiment, an image forming apparatus includes a printer and a controller. The printer performs image formation on a sheet at a first speed relating to a speed of image formation or at a second speed slower than the first speed. The controller acquires information on deterioration of developer contained in an own apparatus, and controls the printer to perform image formation at the first speed when the information does not satisfy a predetermined condition indicating that the developer is deteriorated and to perform image formation at the second speed when the information satisfies the predetermined condition.

Image forming apparatus and image forming method that accounts for deterioration of a developer

According to one embodiment, an image forming apparatus includes a developing device, an environment sensor, a memory, and a processor. The developing device stores a developer containing a toner and a carrier. The environment sensor measures an environment parameter. The memory stores end time environment information indicating an environment parameter of a date and time when printing is ended. The processor discharges the toner stored in the developing device when a difference between the environment parameter indicated by the end time environment information and the environment parameter measured by the environment sensor exceeds a predetermined threshold value, and puts the toner into the developing device.

Image forming apparatus and processing method

An image forming apparatus includes a developer container, an agitator, a toner supply, a toner sensor, and a controller. The developer container contains a two-component developer that includes toner and carrier. The agitator stirs the two-component developer. The toner supply replenishes the developer container with additional toner. The toner sensor detects a toner density of the two-component developer in the developer container. The controller calibrates the toner sensor using the two-component developer. The controller compares a first detection value indicating a toner density at a first time with a second detection value indicating a toner density at a second time after a predetermined time period has elapsed since the first time. The controller issues a notification regarding a suitability of calibration based on a comparison result of the first detection value and the second detection value.

Image forming apparatus with toner sensor and notification method for same

An image forming apparatus of an exemplary embodiment includes a temperature sensor, a developing unit, a supply unit, and a control unit. The temperature sensor detects a temperature. The developing unit supplies developer to an image carrier and performs development. The supply unit contains developer and supplies the contained developer to the developing unit. The control unit executes developer replacement processing including discharging the developer from the developing unit and supplying the developer contained in the supply unit to the developing unit based on a first ratio which a ratio of a developer supply time during which the supply unit performs supply of the developer for the developing unit and a drive time during which the developing unit is driven and a threshold value obtained based on a detected temperature of a temperature sensor.

Image forming apparatus and developer replacement method of image forming apparatus

An image forming apparatus includes a developing roller including a magnet in which a plurality of magnetic poles are arranged and a rotatable sleeve which conveys a developing agent including toner and carrier to develop a latent image formed on a photoconductor, a motor configured to rotate the sleeve and a rotational direction of a motor control section configured to rotate the motor forward or reversely when an image forming job is completed, to rotate the sleeve in a direction reverse to a rotational direction of the sleeve in the image forming job for a reverse rotation time and then rotate the sleeve in a direction the same as the rotational direction of the sleeve in the image forming job for a forward rotation time shorter than the reverse rotation time.

Image forming apparatus capable of removing an agglomerate of developing agent

A developing apparatus includes a development unit configured to supply toner to a photoconductor on which an electrostatic image is formed, a supply unit configured to supply toner to the development unit, a sensor configured to detect a concentration of toner in the development unit, and a control unit. The control unit is configured to, when the detected concentration of the toner is lower than a first value, control the supply unit to perform a toner supply process, control the sensor to detect the concentration of the toner after the toner supply process, count the number of times the sensor detects the concentration of the toner to be higher than a second value that is higher than the first value, and control the supply unit to repeat the toner supply process, when the counted number is less than a predetermined number that is equal to or greater than two.

Developing apparatus and image forming apparatus

A control unit separately drives an image carrier driving unit that drives an image carrier motor, a developing roller driving unit that drives a developing roller motor, a developer stirring member driving unit that drives a developer stirring member motor, and a fan driving unit that drives a fan motor. The control unit causes the fan driving unit to operate if the image carrier driving unit or the developer stirring member driving unit is operating.

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Sunto Shizuoka, Japan

Kei Onishi