Kyocera Document Solutions Inc.

Atsuya Ikeuchi

Ryo Taniguchi

Tomohiro Takahashi

Takeru Nagamoto

An image forming apparatus includes a storage case, a developer conveyance portion, a developer detecting portion, a time measuring portion, and a driving control portion. The storage case stores developer that is supplied to a developing device, and conveys the developer by driving a first conveyance member. The developer conveyance portion conveys, by driving a second conveyance member, the developer supplied from the storage case. The developer detecting portion is provided in the developing device and detects the developer supplied from the developer conveyance portion. The time measuring portion measures a required time between a time when the first conveyance member starts to be driven and a time when the developer detecting portion detects the developer. The driving control portion sets a driving time of the second conveyance member based on the required time measured by the time measuring portion.

Image forming apparatus and developer conveyance setting method

An image forming apparatus includes: an image forming portion having an image carrying member, a charging device, an exposing device, and a developing device; a developing voltage power supply; a control portion; and an image density sensor. The developing device has a developer carrying member that carries two-component developer and a toner concentration sensor. The control portion senses toner concentration during calibration or during first image formation after calibration for correcting image density based on the sensing result from the image density sensor. If the difference Vtarget&#x2212;V between the output value V of the toner concentration sensor actually sensed and a target value Vtarget of the toner concentration sensor to be observed when the toner concentration equals a reference concentration is equal to or larger than a predetermined value, the control portion performs calibration again when the amount of toner consumed after calibration reaches a predetermined threshold value.

Image forming apparatus

A readout controlling device includes a start time recording portion, a transmission controlling portion, an error determining portion, and a time changing portion. A start time of when a piece of information is read out from a storage device connected to the readout controlling device is recorded in the start time recording portion. The transmission controlling portion transmits a readout request to read out the piece of information, toward the storage device based on the start time. The error determining portion receives the piece of information readout from the storage device, and determines whether or not an error has occurred in the piece of information. If the error has been determined to have occurred, the time changing portion can change the start time recorded in the start time recording portion.

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Osaka, Japan

Atsuya Ikeuchi