JP2021071531A5 - - Google Patents
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- JP2021071531A5 JP2021071531A5 JP2019196567A JP2019196567A JP2021071531A5 JP 2021071531 A5 JP2021071531 A5 JP 2021071531A5 JP 2019196567 A JP2019196567 A JP 2019196567A JP 2019196567 A JP2019196567 A JP 2019196567A JP 2021071531 A5 JP2021071531 A5 JP 2021071531A5
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本発明は、振動モードの実行間隔を適正化できる画像形成装置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus capable of optimizing the execution interval of the vibration mode.
本発明の画像形成装置は、像担持体と、トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、前記供給スリーブに直流電圧と交流電圧とが重畳された供給バイアスを印加する供給バイアス印加手段と、前記現像スリーブに直流電圧と交流電圧とが重畳された現像バイアスを印加する現像バイアス印加手段と、前記トナー受け部材を振動させる振動手段と、前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、を備え、画像形成動作時に前記供給バイアス印加手段によって印加される前記供給バイアスの交流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される前記現像バイアスの交流電圧との交流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記交流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短いことを特徴とする。
また、本発明の画像形成装置は、像担持体と、トナーとキャリアを含む現像剤を収容する現像容器と、前記像担持体に形成された静電潜像を現像するために前記現像剤を担持搬送する現像剤担持体と、を有する現像装置と、前記現像剤担持体に直流電圧と交流電圧とが重畳されたバイアスを印加するバイアス印加手段と、前記現像装置を振動させる振動手段と、前記振動手段を制御して前記現像装置を振動させる振動モードを実行する制御手段と、を備え、画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が第１の電圧である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が前記第１の電圧よりも大きい第２の電圧である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短いことを特徴とする。
The image forming apparatus of the present invention comprises an image carrier, a developing container containing developer containing toner and carrier and forming a developer circulation path, and developing an electrostatic latent image formed on the image carrier. a developing sleeve that carries and conveys toner to a developing position where the developing sleeve is located, and a supply sleeve that is arranged opposite to the developing sleeve and carries and conveys the developer supplied from the circulation path and supplies only toner to the developing sleeve; a toner receiving member that receives toner falling from the developing sleeve; supply bias applying means for applying a supply bias in which a DC voltage and an AC voltage are superimposed to the supply sleeve; Developing bias applying means for applying a developing bias in which a voltage and an AC voltage are superimposed; vibrating means for vibrating the toner receiving member; and vibration mode for vibrating the toner receiving member by controlling the vibrating means. and a control means, wherein the AC voltage of the supply bias applied by the supply bias applying means during image forming operation and the AC voltage of the developing bias applied by the developing bias applying means during image forming operation are alternated. If the alternating potential difference is a second potential difference that is greater than the first potential difference than the execution interval of the vibration mode executed by the control means when the potential difference is the first potential difference, the control is performed. It is characterized in that the execution interval of the vibration mode executed by means is shorter .
Further, the image forming apparatus of the present invention comprises an image carrier, a developing container containing developer containing toner and carrier, and the developer for developing an electrostatic latent image formed on the image carrier. a developing device that carries and conveys a developer carrier; bias applying means for applying a bias in which a DC voltage and an AC voltage are superimposed to the developer carrier; vibrating means for vibrating the developing device; and control means for controlling the vibration means to execute a vibration mode for vibrating the developing device, wherein the AC voltage of the bias applied by the bias applying means during an image forming operation is a first voltage. (2) an AC voltage of the bias applied by the bias applying means during an image forming operation is a second voltage that is greater than the first voltage than the execution interval of the vibration mode executed by the control means; case, the execution interval of the vibration mode executed by the control means is shorter.
また、本発明の画像形成装置は、像担持体と、トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、前記供給スリーブに直流電圧と交流電圧とが重畳された供給バイアスを印加する供給バイアス印加手段と、前記現像スリーブに直流電圧と交流電圧とが重畳された現像バイアスを印加する現像バイアス印加手段と、前記トナー受け部材を振動させる振動手段と、前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、を備え、画像形成動作時に前記供給バイアス印加手段によって印加される前記供給バイアスの直流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される前記現像バイアスの直流電圧との直流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短いことを特徴とする。 Further, the image forming apparatus of the present invention comprises an image carrier, a developing container containing developer containing toner and carrier and forming a developer circulation path, and an electrostatic latent image formed on the image carrier. a developing sleeve for carrying and conveying toner to a developing position where the image is developed; and a supply sleeve arranged opposite to the developing sleeve for carrying and conveying the developer supplied from the circulation path and supplying only the toner to the developing sleeve. a toner receiving member for receiving toner falling from the developing sleeve; supply bias applying means for applying a supply bias obtained by superimposing a DC voltage and an AC voltage to the supply sleeve; and the developing sleeve. a developing bias applying means for applying a developing bias in which a DC voltage and an AC voltage are superimposed on each other; vibrating means for vibrating the toner receiving member; and a vibration mode for vibrating the toner receiving member by controlling the vibrating means. a DC voltage of the supply bias applied by the supply bias applying means during an image forming operation; and a DC voltage of the developing bias applied by the developing bias applying means during an image forming operation. is a first potential difference, and the DC potential difference is a second potential difference larger than the first potential difference than the execution interval of the vibration mode executed by the control means, Execution intervals of the vibration modes executed by the control means are shorter .
また、本発明の画像形成装置は、像担持体と、トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、前記供給スリーブに交流電圧を印加することなく直流電圧を印加する供給バイアス印加手段と、前記現像スリーブに交流電圧を印加することなく直流電圧を印加する現像バイアス印加手段と、前記トナー受け部材を振動させる振動手段と、前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、を備え、画像形成動作時に前記供給バイアス印加手段によって前記供給スリーブに印加される直流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される直流電圧との直流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短いことを特徴とする。 Further, the image forming apparatus of the present invention comprises an image carrier, a developing container containing developer containing toner and carrier and forming a developer circulation path, and an electrostatic latent image formed on the image carrier. a developing sleeve for carrying and conveying toner to a developing position where the image is developed; and a supply sleeve arranged opposite to the developing sleeve for carrying and conveying the developer supplied from the circulation path and supplying only the toner to the developing sleeve. a toner receiving member for receiving toner falling from the developing sleeve; supply bias applying means for applying a DC voltage without applying an AC voltage to the supply sleeve; and an AC voltage applied to the developing sleeve. development bias applying means for applying a DC voltage without applying a voltage, vibrating means for vibrating the toner receiving member, control means for controlling the vibrating means and executing a vibration mode for vibrating the toner receiving member; wherein a DC potential difference between the DC voltage applied to the supply sleeve by the supply bias applying means during image forming operation and the DC voltage applied by the developing bias applying means during image forming operation is the first potential difference. the vibration mode executed by the control means when the DC potential difference is a second potential difference larger than the first potential difference than the execution interval of the vibration mode executed by the control means. is characterized in that the execution interval of is shorter .
本発明によれば、振動モードの実行間隔を適正化できる。 According to the present invention, it is possible to optimize the execution interval of the vibration mode.
Claims (10)
トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、
前記供給スリーブに直流電圧と交流電圧とが重畳された供給バイアスを印加する供給バイアス印加手段と、
前記現像スリーブに直流電圧と交流電圧とが重畳された現像バイアスを印加する現像バイアス印加手段と、
前記トナー受け部材を振動させる振動手段と、
前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、
を備え、
画像形成動作時に前記供給バイアス印加手段によって印加される前記供給バイアスの交流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される前記現像バイアスの交流電圧との交流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記交流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、
ことを特徴とする画像形成装置。 an image carrier;
a developing container containing developer containing toner and carrier and forming a developer circulation path; and a developing sleeve carrying and conveying toner to a developing position where an electrostatic latent image formed on the image carrier is developed; a supply sleeve disposed opposite to the developing sleeve for carrying and conveying the developer supplied from the circulation path and supplying only toner to the developing sleeve; and a toner receiving member for receiving toner falling from the developing sleeve. a developing device having
supply bias applying means for applying a supply bias in which a DC voltage and an AC voltage are superimposed to the supply sleeve;
a development bias applying means for applying a development bias in which a DC voltage and an AC voltage are superimposed to the development sleeve;
vibrating means for vibrating the toner receiving member;
a control means for controlling the vibration means to execute a vibration mode for vibrating the toner receiving member;
with
The AC potential difference between the AC voltage of the supply bias applied by the supply bias applying means during image forming operation and the AC voltage of the developing bias applied by the developing bias applying means during image forming operation is a first potential difference. In one case, the vibration performed by the control means when the alternating potential difference is a second potential difference greater than the first potential difference than the interval between the executions of the vibration mode performed by the control means. mode execution intervals are shorter,
An image forming apparatus characterized by:
ことを特徴とする請求項１に記載の画像形成装置。 The AC potential difference is the first potential difference, and the DC voltage of the supply bias applied by the supply bias applying means during an image forming operation and the developing applied by the developing bias applying means during an image forming operation When the DC potential difference from the DC voltage of the bias is a third potential difference, the AC potential difference is the first potential difference and the DC potential difference is greater than the execution interval of the vibration mode executed by the control means. when the potential difference is a fourth potential difference larger than the third potential difference, the execution interval of the vibration mode executed by the control means is shorter;
2. The image forming apparatus according to claim 1, wherein:
前記現像スリーブは、回転可能であり、
前記供給スリーブと前記現像スリーブが対向する部分において、前記供給スリーブの回転方向は、前記現像スリーブの回転方向とは反対方向であり、
前記交流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを第１の回転速度で所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記交流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを前記第１の回転速度よりも速い第２の回転速度で前記所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、
ことを特徴とする請求項１に記載の画像形成装置。 the feed sleeve is rotatable,
The developing sleeve is rotatable,
In a portion where the supply sleeve and the development sleeve face each other, the direction of rotation of the supply sleeve is opposite to the direction of rotation of the development sleeve,
When the AC potential difference is the first potential difference and the supply sleeve is rotated at the first rotation speed for a predetermined time during the image forming operation, the vibration mode is executed by the control means at the execution interval. Also, when the AC potential difference is the first potential difference and the supply sleeve is rotated at the second rotation speed higher than the first rotation speed for the predetermined time during the image forming operation, the control the intervals between executions of said vibration modes executed by means are shorter;
2. The image forming apparatus according to claim 1, wherein:
トナーとキャリアを含む現像剤を収容する現像容器と、前記像担持体に形成された静電潜像を現像するために前記現像剤を担持搬送する現像剤担持体と、を有する現像装置と、
前記現像剤担持体に直流電圧と交流電圧とが重畳されたバイアスを印加するバイアス印加手段と、
前記現像装置を振動させる振動手段と、
前記振動手段を制御して前記現像装置を振動させる振動モードを実行する制御手段と、
を備え、
画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が第１の電圧である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が前記第１の電圧よりも大きい第２の電圧である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、
ことを特徴とする画像形成装置。 an image carrier;
a developing device comprising: a developing container containing a developer containing toner and a carrier; and a developer bearing member for carrying and conveying the developer for developing an electrostatic latent image formed on the image bearing member;
bias applying means for applying a bias in which a DC voltage and an AC voltage are superimposed to the developer carrier;
vibrating means for vibrating the developing device;
a control means for controlling the vibration means to execute a vibration mode for vibrating the developing device;
with
When the AC voltage of the bias applied by the bias applying means during the image forming operation is the first voltage, the bias application during the image forming operation is faster than the execution interval of the vibration mode executed by the control means. when the alternating voltage of the bias applied by means is a second voltage greater than the first voltage, the execution interval of the vibration mode executed by the control means is shorter;
An image forming apparatus characterized by:
ことを特徴とする請求項４に記載の画像形成装置。 5. The image forming apparatus according to claim 4, wherein:
画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が前記第１の電圧であり、且つ、画像形成動作時に前記現像剤担持体を第１の回転速度で所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、画像形成動作時に前記バイアス印加手段によって印加される前記バイアスの交流電圧が前記第１の電圧であり、且つ、画像形成動作時に前記現像剤担持体を前記第１の回転速度よりも速い第２の回転速度で前記所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、 When the AC voltage of the bias applied by the bias applying means during the image forming operation is the first voltage, and the developer carrying member is rotated at the first rotation speed for a predetermined time during the image forming operation. and the AC voltage of the bias applied by the bias applying means during an image forming operation is the first voltage rather than the execution interval of the vibration mode executed by the control means, and When the developer carrying member is rotated at a second rotation speed higher than the first rotation speed for the predetermined time, an execution interval of the vibration mode executed by the control means is shorter.
ことを特徴とする請求項４に記載の画像形成装置。 5. The image forming apparatus according to claim 4, wherein:
トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、 a developing container containing developer containing toner and carrier and forming a developer circulation path; and a developing sleeve carrying and conveying toner to a developing position where an electrostatic latent image formed on the image carrier is developed; a supply sleeve arranged opposite to the developing sleeve for carrying and conveying the developer supplied from the circulation path and supplying only toner to the developing sleeve; and a toner receiving member for receiving the toner dropped from the developing sleeve. a developing device having
前記供給スリーブに直流電圧と交流電圧とが重畳された供給バイアスを印加する供給バイアス印加手段と、 supply bias applying means for applying a supply bias in which a DC voltage and an AC voltage are superimposed to the supply sleeve;
前記現像スリーブに直流電圧と交流電圧とが重畳された現像バイアスを印加する現像バイアス印加手段と、 a development bias applying means for applying a development bias in which a DC voltage and an AC voltage are superimposed to the development sleeve;
前記トナー受け部材を振動させる振動手段と、 vibrating means for vibrating the toner receiving member;
前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、 a control means for controlling the vibration means to execute a vibration mode for vibrating the toner receiving member;
を備え、 with
画像形成動作時に前記供給バイアス印加手段によって印加される前記供給バイアスの直流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される前記現像バイアスの直流電圧との直流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、 A DC potential difference between the DC voltage of the supply bias applied by the supply bias applying means during an image forming operation and the DC voltage of the developing bias applied by the developing bias applying means during an image forming operation is a first potential difference. In some cases, the vibration performed by the control means when the DC potential difference is a second potential difference greater than the first potential difference than an interval between the executions of the vibration mode performed by the control means. mode execution intervals are shorter,
ことを特徴とする画像形成装置。 An image forming apparatus characterized by:
前記現像スリーブは、回転可能であり、 The developing sleeve is rotatable,
前記供給スリーブと前記現像スリーブが対向する部分において、前記供給スリーブの回転方向は、前記現像スリーブの回転方向とは反対方向であり、 In a portion where the supply sleeve and the development sleeve face each other, the direction of rotation of the supply sleeve is opposite to the direction of rotation of the development sleeve,
前記直流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを第１の回転速度で所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを前記第１の回転速度よりも速い第２の回転速度で前記所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、 When the DC potential difference is the first potential difference and the supply sleeve is rotated at the first rotation speed for a predetermined time during image forming operation, the vibration mode is executed by the control means at intervals of Also, when the DC potential difference is the first potential difference and the supply sleeve is rotated at a second rotation speed higher than the first rotation speed for the predetermined time during an image forming operation, the control the intervals between executions of said vibration modes executed by means are shorter;
ことを特徴とする請求項７に記載の画像形成装置。 8. The image forming apparatus according to claim 7, wherein:
トナーとキャリアを含む現像剤を収容し且つ現像剤の循環経路を形成する現像容器と、前記像担持体に形成された静電潜像を現像する現像位置にトナーを担持搬送する現像スリーブと、前記現像スリーブに対向して配置され且つ前記循環経路から供給された現像剤を担持搬送し且つ前記現像スリーブにトナーのみを供給する供給スリーブと、前記現像スリーブから落下するトナーを受けるトナー受け部材と、を有する現像装置と、 a developing container containing developer containing toner and carrier and forming a developer circulation path; and a developing sleeve carrying and conveying toner to a developing position where an electrostatic latent image formed on the image carrier is developed; a supply sleeve arranged opposite to the developing sleeve for carrying and conveying the developer supplied from the circulation path and supplying only toner to the developing sleeve; and a toner receiving member for receiving the toner dropped from the developing sleeve. a developing device having
前記供給スリーブに交流電圧を印加することなく直流電圧を印加する供給バイアス印加手段と、 supply bias applying means for applying a DC voltage without applying an AC voltage to the supply sleeve;
前記現像スリーブに交流電圧を印加することなく直流電圧を印加する現像バイアス印加手段と、 development bias applying means for applying a DC voltage without applying an AC voltage to the developing sleeve;
前記トナー受け部材を振動させる振動手段と、 vibrating means for vibrating the toner receiving member;
前記振動手段を制御して前記トナー受け部材を振動させる振動モードを実行する制御手段と、 a control means for controlling the vibration means to execute a vibration mode for vibrating the toner receiving member;
を備え、 with
画像形成動作時に前記供給バイアス印加手段によって前記供給スリーブに印加される直流電圧と、画像形成動作時に前記現像バイアス印加手段によって印加される直流電圧との直流電位差が第１の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差よりも大きい第２の電位差である場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、 When a DC potential difference between the DC voltage applied to the supply sleeve by the supply bias applying means during image forming operation and the DC voltage applied by the developing bias applying means during image forming operation is a first potential difference, When the DC potential difference is a second potential difference larger than the first potential difference, the interval at which the vibration mode is performed by the control means is greater than the interval at which the vibration mode is performed by the control means. is shorter,
ことを特徴とする画像形成装置。 An image forming apparatus characterized by:
前記現像スリーブは、回転可能であり、 The developing sleeve is rotatable,
前記供給スリーブと前記現像スリーブが対向する部分において、前記供給スリーブの回転方向は、前記現像スリーブの回転方向とは反対方向であり、 In a portion where the supply sleeve and the development sleeve face each other, the direction of rotation of the supply sleeve is opposite to the direction of rotation of the development sleeve,
前記直流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを第１の回転速度で所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔よりも、前記直流電位差が前記第１の電位差であり、且つ、画像形成動作時に前記供給スリーブを前記第１の回転速度よりも速い第２の回転速度で前記所定時間回転させた場合に、前記制御手段によって実行される前記振動モードの実行間隔の方が短い、 When the DC potential difference is the first potential difference and the supply sleeve is rotated at the first rotation speed for a predetermined time during image forming operation, the vibration mode is executed by the control means at intervals of Also, when the DC potential difference is the first potential difference and the supply sleeve is rotated at a second rotation speed higher than the first rotation speed for the predetermined time during an image forming operation, the control the intervals between executions of said vibration modes executed by means are shorter;
ことを特徴とする請求項９に記載の画像形成装置。 10. The image forming apparatus according to claim 9, wherein:
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| KR101293000B1 (en) * | 2011-02-04 | 2013-08-02 | 교세라 도큐멘트 솔루션즈 가부시키가이샤 | Developing apparatus and image forming apparatus having the same |
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