JP2017090518A5

JP2017090518A5 -

Info

Publication number: JP2017090518A5
Application number: JP2015216176A
Authority: JP
Filing date: 2015-11-02
Publication date: 2018-09-20
Anticipated expiration: 2035-11-02

Description

上述した課題を解決するために、請求項１の発明は、潜像担持体と、トナーとキャリアとを含む現像剤を用いて前記潜像担持体の表面上の潜像を現像する現像装置と、前記現像装置の現像ケース内における現像剤中のトナー濃度を検知するトナー濃度検知手段と、前記現像ケース内へトナーを補給するトナー補給手段と、前記トナー濃度検知手段の検知結果に基づいて、前記現像ケース内における現像剤中のトナー濃度が画像形成動作中に所定のトナー濃度許容範囲内の目標トナー濃度になるように前記トナー補給手段を制御するトナー補給制御、及び、前記潜像担持体上に前記現像ケース内のトナーを付着させて該現像ケース内のトナーを強制的に消費させるトナー強制消費制御を実行する制御手段とを有する画像形成装置において、前記制御手段は、前記トナー強制消費制御を開始するにあたって前記トナー濃度検知手段によって検知されたトナー濃度である制御開始時トナー濃度が所定の閾値以上である場合は、前記トナー補給手段によるトナー補給を行わずに、規定トナー濃度まで前記現像ケース内のトナー濃度が低下するまで前記トナー強制消費制御を実行し、その後に、前記現像ケース内のトナー濃度が前記制御開始時トナー濃度に達するまで前記トナー強制消費制御を行わずに前記現像ケースへトナーを補給するトナー強制消費後のトナー補給制御を実行する一方、前記制御開始時トナー濃度が前記所定の閾値よりも低い場合は、前記トナー補給手段を制御して前記現像ケースへトナーを補給するトナー強制消費並行実行時のトナー補給制御を実行しながら前記トナー強制消費制御を実行するとともに、その実行を終了する時に前記現像ケース内のトナー濃度が前記制御開始時トナー濃度となるように、前記トナー強制消費並行実行時のトナー補給制御と前記トナー強制消費制御とを実行することを特徴とするものである。
In order to solve the above-described problems, the invention of claim 1 is a development device that develops a latent image on the surface of the latent image carrier using a latent image carrier and a developer containing toner and a carrier. The toner concentration detecting means for detecting the toner concentration in the developer in the developing case of the developing device, the toner supplying means for supplying toner into the developing case, and the detection result of the toner concentration detecting means, A toner replenishment control for controlling the toner replenishing means so that the toner concentration in the developer in the developing case becomes a target toner concentration within a predetermined toner concentration allowable range during an image forming operation; and the latent image carrier. An image forming apparatus comprising: control means for performing toner forced consumption control for adhering toner in the developing case to forcibly consume the toner in the developing case; When the toner density at the start of control, which is the toner density detected by the toner density detecting means when starting the toner forced consumption control, is equal to or higher than a predetermined threshold, the toner replenishing means performs toner replenishment. The forced toner consumption control is executed until the toner density in the developing case decreases to a specified toner density, and then the toner forced force is increased until the toner density in the developing case reaches the toner density at the start of the control. Toner replenishment control after forced toner consumption for replenishing toner to the developing case without performing consumption control is executed. When the toner density at the start of control is lower than the predetermined threshold, the toner replenishing means is controlled. The toner is replenished while executing toner replenishment control during concurrent execution of toner forced consumption for replenishing toner to the developing case. The forced toner consumption control and the forced toner consumption control during the forced toner consumption parallel execution are performed so that the forced toner consumption control is executed and the toner density in the developing case becomes the toner density at the start of the control when the execution is finished. Are executed.

Claims

A developing device that develops a latent image on the surface of the latent image carrier using a developer including a latent image carrier, a toner and a carrier, and a toner concentration in the developer in a developing case of the developing device. Based on the detection result of the toner density detecting means for detecting, the toner replenishing means for supplying the toner into the developing case, and the toner density detecting means, the toner density in the developer in the developing case is during the image forming operation. Toner supply control for controlling the toner supply means so as to achieve a target toner concentration within a predetermined toner density allowable range, and the toner in the developing case is adhered to the latent image carrier, and the inside of the developing case is An image forming apparatus having control means for executing toner forced consumption control for forcibly consuming the toner of
When the toner density at the start of control, which is the toner density detected by the toner density detecting means when starting the forced toner consumption control, is equal to or higher than a predetermined threshold, the control means supplies toner by the toner replenishing means. Without performing the toner forced consumption control until the toner density in the developing case decreases to a specified toner density, and then the toner density in the developing case reaches the toner density at the start of the control. Toner replenishment control after forced toner consumption for replenishing toner to the developing case without performing forced consumption control is executed. On the other hand, if the toner concentration at the start of control is lower than the predetermined threshold, the toner replenishing means is Controlling and supplying toner to the developing case while performing toner replenishment control at the time of forced toner consumption concurrent execution Toner forcible consumption control, and when the execution is finished, the toner replenishment control and the toner forcible consumption during the toner forcible consumption parallel execution are performed so that the toner density in the developing case becomes the toner density at the start of the control. And an image forming apparatus.

The image forming apparatus according to claim 1.
Each latent image formed on the surface of three or more latent image carriers is developed using toner in a developer housed in a different developing device to individually form a toner image. The toner image formed on the surface of the carrier has a configuration in which the toner images are transferred onto the intermediate transfer member or onto the recording material carried on the recording material conveying member so as to overlap each other,
A cleaning means for cleaning deposits on the intermediate transfer member or the recording material conveying member;
The control means transfers the toner onto the intermediate transfer member or the recording material conveying member so that only a part of the toner adhering to the surface of each latent image carrier is overlapped by the forced toner consumption control. Forming equipment.

The image forming apparatus according to claim 1, wherein
And an operation receiving unit, wherein the control unit determines that a predetermined toner forced consumption timing has arrived when the operation receiving unit receives a predetermined operation, and starts the forced toner consumption control. An image forming apparatus.

The image forming apparatus according to any one of claims 1 to 3,
Each latent image formed on the surface of a plurality of latent image carriers is developed with toner in a developer housed in a different developing device to individually form toner images, and each latent image carrier A toner image formed on the surface of the body is transferred onto an intermediate transfer member or onto a recording material carried on a recording material conveying member so as to overlap each other;
The image forming apparatus according to claim 1, wherein the control unit has a control mode for executing the toner forced consumption control only for a part of the developing devices.

The image forming apparatus according to claim 1, wherein:
A target toner density changing means for adjusting the target toner density within a predetermined toner density tolerance range;
2. The image forming apparatus according to claim 1, wherein the specified toner density is set to a lower limit value of the toner density allowable range.