JPH10319714A - Pressure contacting force adjusting method for image forming device and developer layer thickness regulating member - Google Patents
Pressure contacting force adjusting method for image forming device and developer layer thickness regulating memberInfo
- Publication number
- JPH10319714A JPH10319714A JP14297397A JP14297397A JPH10319714A JP H10319714 A JPH10319714 A JP H10319714A JP 14297397 A JP14297397 A JP 14297397A JP 14297397 A JP14297397 A JP 14297397A JP H10319714 A JPH10319714 A JP H10319714A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic body
- developer
- layer thickness
- regulating member
- thickness regulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は静電複写機等の画像
形成装置に関し、特に、画像形成装置における現像剤担
持体、例えば、現像ローラに付着した現像剤を均一な層
として形成する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrostatic copying machine and, more particularly, to a technique for forming a developer carrying member in an image forming apparatus, for example, a developer adhered to a developing roller as a uniform layer. .
【０００２】[0002]
【従来の技術】図４に、画像形成装置における現像ロー
ラ上の現像剤薄層形成技術の従来例を示す。同図で、現
像装置１００′の現像ケース１内の現像剤２は現像剤担
持体としての現像ローラ３に付着し、現像ローラ３が矢
印４方向に回転することによって、図示しない感光体ド
ラムへと運ばれる。このとき、板状の現像剤層厚規制部
材５の圧接力６によって現像ローラ３の表面の現像剤薄
層７の厚さが所望の厚さでかつ一定の厚さになるように
される。2. Description of the Related Art FIG. 4 shows a conventional example of a technique for forming a thin developer layer on a developing roller in an image forming apparatus. In the figure, a developer 2 in a developing case 1 of a developing device 100 'adheres to a developing roller 3 as a developer carrier, and the developing roller 3 rotates in a direction of arrow 4 to a photosensitive drum (not shown). Is carried. At this time, the thickness of the developer thin layer 7 on the surface of the developing roller 3 is controlled to be a desired thickness and a constant thickness by the pressing force 6 of the plate-shaped developer layer thickness regulating member 5.
【０００３】[0003]
【発明が解決しようとする課題】上述したように、現像
剤層厚規制部材５は、現像ローラ３に付着した現像剤を
均一な層として形成する機能を有しているが、現像剤層
厚規制部材５のたわみや経時的な弛緩等によって圧接力
に変化や分布のむらが生じ、この結果、形成される画像
に現像むらや濃度むら、或いは濃度の過不足等の画像不
良が生ずる要因となるという問題点があった。As described above, the developer layer thickness regulating member 5 has a function of forming the developer adhered to the developing roller 3 as a uniform layer. A change or uneven distribution of the pressing force occurs due to the bending or loosening of the regulating member 5 over time, and as a result, image defects such as uneven development, uneven density, or excessive or insufficient density of the formed image are caused. There was a problem.
【０００４】特に、現像ローラ３や現像剤層厚規制部材
５が現像剤と共にケースで覆われている現像装置では、
現像剤層厚規制部材５の圧接力調整のためには現像ユニ
ットを分解することが必要となるが、分解の際、現像剤
が周囲に飛散する可能性が大きいので、分解による現像
剤層厚規制部材の圧接力調整は、事実上困難であるとい
う問題点があった。Particularly, in a developing device in which the developing roller 3 and the developer layer thickness regulating member 5 are covered with a case together with the developer,
In order to adjust the pressing force of the developer layer thickness regulating member 5, it is necessary to disassemble the developing unit. However, at the time of disassembly, there is a high possibility that the developer is scattered around. There is a problem that it is practically difficult to adjust the pressing force of the regulating member.
【０００５】本発明は上記問題点に鑑みてなされたもの
であり、現像ローラに付着した現像剤を均一な層として
形成するため現像ユニットのケース外部に現像剤層厚規
制部材の圧接力を調整する装置を備えた画像形成装置お
よび現像剤層厚規制部材の圧接力調整方法の提供を目的
とする。The present invention has been made in view of the above problems, and adjusts the pressure contact force of a developer layer thickness regulating member outside a case of a developing unit in order to form a uniform layer of developer adhered to a developing roller. It is an object of the present invention to provide an image forming apparatus provided with an apparatus for adjusting the pressing force of a developer layer thickness regulating member.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに本発明の画像形成装置は、現像ユニット内に、粉末
状の現像剤と、該現像剤を感光体に供給する現像ローラ
と、該現像ローラに担持された現像剤を押圧して現像剤
薄層を形成する現像剤層厚規制部材と、を有する画像形
成装置において、上記現像剤層厚規制部材上に内部磁性
体を設け、上記現像ユニット外の上記内部磁性体と対向
する位置に外部磁性体を設け、両磁性体相互間に作用す
る磁力を可変としたことを特徴としている。In order to achieve the above object, an image forming apparatus according to the present invention includes a developing unit, a powdery developer, a developing roller for supplying the developer to a photoreceptor, A developer layer thickness regulating member that presses the developer carried on the developing roller to form a developer thin layer, and an image forming apparatus, wherein an internal magnetic body is provided on the developer layer thickness regulating member, An external magnetic body is provided outside the developing unit at a position facing the internal magnetic body, and a magnetic force acting between the two magnetic bodies is made variable.
【０００７】また、上記外部磁性体が移動可能に構成さ
れると共に、該外部磁性体と上記内部磁性体の対向する
磁極が共に同じ極性を有する構成や、上記外部磁性体が
移動可能に構成されると共に、該外部磁性体と上記内部
磁性体の対向する磁極が互に逆の極性を有する構成や、
上記外部磁性体が電磁石で、該電磁石に加える電流値お
よび電流の方向を制御する電流制御装置を設け、上記外
部磁性体の磁力の大きさおよび磁極の極性を電流値およ
び電流の方向を制御することによって上記画像担持体に
対する上記現像剤層厚規制部材の圧接力を変化させる構
成とすることができる。In addition, the external magnetic body is configured to be movable, the opposite magnetic poles of the external magnetic body and the internal magnetic body have the same polarity, and the external magnetic body is configured to be movable. And a configuration in which opposite magnetic poles of the external magnetic body and the internal magnetic body have opposite polarities,
The external magnetic body is an electromagnet, and a current control device for controlling a current value and a current direction applied to the electromagnet is provided, and a magnitude of a magnetic force of the external magnetic body and a polarity of the magnetic pole are controlled by a current value and a current direction. Thereby, the pressure contact force of the developer layer thickness regulating member against the image carrier can be changed.
【０００８】また、本発明の現像剤層厚規制部材の圧接
力調整方法は、現像ユニット内に、粉末状の現像剤と、
該現像剤を感光体に供給する現像ローラと、該現像ロー
ラに担持された現像剤を押圧して現像剤薄層を形成する
現像剤層厚規制部材と、を有する画像形成装置におい
て、上記現像剤層厚規制部材上に内部磁性体を設け、上
記現像ユニット外の該内部磁性体に対向する位置に設け
た外部磁性体からの磁気作用を変化させて、上記画像担
持体に対する上記現像剤層厚規制部材の圧接力を調整す
ることを特徴としている。Further, according to the method for adjusting the pressing force of the developer layer thickness regulating member of the present invention, a powdery developer is contained in a developing unit.
An image forming apparatus comprising: a developing roller that supplies the developer to a photoreceptor; and a developer layer thickness regulating member that presses the developer carried by the developing roller to form a developer thin layer. An internal magnetic body is provided on the developer layer thickness regulating member, and a magnetic effect from an external magnetic body provided outside the developing unit at a position facing the internal magnetic body is changed, so that the developer layer with respect to the image carrier is changed. It is characterized in that the pressure contact force of the thickness regulating member is adjusted.
【０００９】また、上記外部磁性体を移動可能にし、上
記外部磁性体と内部磁性体との距離を変化させて、上記
圧接力を調整する方法や、上記外部磁性体を電磁石と
し、上記外部磁性体の磁力の大きさ及び／又は磁極の極
性を、上記外部磁性体に加える電流値および電流の方向
を制御することによって上記圧接力を変化させる方法と
することもできる。Further, a method of adjusting the pressing force by making the external magnetic body movable and changing a distance between the external magnetic body and the internal magnetic body, and a method of using the external magnetic body as an electromagnet, A method of changing the pressure contact force by controlling the magnitude of the magnetic force of the body and / or the polarity of the magnetic pole by controlling the current value and the direction of the current applied to the external magnetic body may be adopted.
【００１０】[0010]
【発明の実施の形態】図１は本発明の現像装置の一実施
例の要部の構成を示す図であり、現像装置１００は、現
像ケース１および現像剤層厚規制部材圧力調整装置１０
を備えており、現像ケース１は、現像剤２、ドラム状の
現像ローラ３、板状の現像剤層厚規制部材５、および現
像剤層厚規制部材５の上に設けられた内部磁性体８を有
し、現像剤層厚規制部材圧力調整装置１０は外部磁性体
１１と、外部磁性体１１を保持すると共に外部磁性体１
１を移動させる移動装置１２からなり、移動装置１２は
設置面１３に固設されている。FIG. 1 is a view showing the structure of a main part of an embodiment of a developing device according to the present invention. A developing device 100 comprises a developing case 1 and a developer layer thickness regulating member pressure adjusting device 10.
The developing case 1 includes a developer 2, a drum-shaped developing roller 3, a plate-shaped developer layer thickness regulating member 5, and an internal magnetic body 8 provided on the developer layer thickness regulating member 5. The developer layer thickness regulating member pressure adjusting device 10 includes an external magnetic body 11, the external magnetic body 11
1 is moved, and the moving device 12 is fixed to the installation surface 13.
【００１１】ここで、外部磁性体１１に対向する内部磁
性体８の極性と内部磁性体８に対向する外部磁性体１１
の極性を図１に示すように同じ（図１では互にＳ極）と
すると磁気作用により内部磁性体８と外部磁性体１１が
反発し合うので、現像剤層厚規制部５が現像ローラ３方
向に押圧され、現像剤層厚規制部材５の現像ローラ３に
対する圧接力が大きくなり、外部磁性体１１に対向する
内部磁性体８の極性と内部磁性体８に対向する外部磁性
体１１の極性を逆にすると内部磁性体８と外部磁性体１
１が吸引し合うので、現像剤層厚規制部材５が現像ロー
ラ３から放れる方向に動き、現像剤層厚規制部材５の現
像ローラ３に対する圧接力が小さくなる。Here, the polarity of the internal magnetic body 8 facing the external magnetic body 11 and the polarity of the external magnetic body 11 facing the internal magnetic body 8 are described.
If the polarities of the magnetic layers are the same as shown in FIG. 1 (the south poles in FIG. 1), the internal magnetic body 8 and the external magnetic body 11 repel each other due to the magnetic action. And the pressing force of the developer layer thickness regulating member 5 against the developing roller 3 is increased, and the polarity of the internal magnetic body 8 facing the external magnetic body 11 and the polarity of the external magnetic body 11 facing the internal magnetic body 8 are increased. Is reversed, the inner magnetic body 8 and the outer magnetic body 1
Since the suction members 1 attract each other, the developer layer thickness regulating member 5 moves in a direction in which the developer layer thickness regulating member 5 is released from the developing roller 3, and the pressing force of the developer layer thickness regulating member 5 against the developing roller 3 is reduced.
【００１２】また、移動体１２を外部磁性体１１が上下
に移動できるように構成している。そして、内部磁性体
８と外部磁性体１１との距離を調整すれば、外部磁性体
１１に対向する内部磁性体８の極性と内部磁性体８に対
向する外部磁性体１１の極性を同じにするようにした場
合には内部磁性体８と外部磁性体１１との距離が近づけ
ば圧接力が増大し、遠ざかれば圧接力が減少する。ま
た、外部磁性体１１に対向する内部磁性体８の極性と内
部磁性体８に対向する外部磁性体１１の極性を逆にする
ようにした場合には内部磁性体８と外部磁性体１１との
距離が近づけば圧接力が減少し、遠ざかれば圧接力が増
大する。これにより、現像剤層厚規制部材５の現像ロー
ラ３に対する圧接力の調整が可能となる。The moving body 12 is configured such that the external magnetic body 11 can move up and down. If the distance between the internal magnetic body 8 and the external magnetic body 11 is adjusted, the polarity of the internal magnetic body 8 facing the external magnetic body 11 and the polarity of the external magnetic body 11 facing the internal magnetic body 8 are made the same. In this case, when the distance between the internal magnetic body 8 and the external magnetic body 11 is short, the pressing force increases, and when the distance increases, the pressing force decreases. When the polarity of the internal magnetic body 8 facing the external magnetic body 11 and the polarity of the external magnetic body 11 facing the internal magnetic body 8 are reversed, the polarity of the internal magnetic body 8 and the external magnetic body 11 may be reduced. The closer the distance, the lower the pressing force, and the farther away, the higher the pressing force. This makes it possible to adjust the pressing force of the developer layer thickness regulating member 5 against the developing roller 3.
【００１３】また、代替手段として、移動体１２を、外
部磁性体１１を現像ローラ３の長手方向に対して前後に
移動可能に構成し、また、図２に示すように、複数の内
部磁性体８を現像剤層厚規制部材５上で現像ローラ３の
長手方向に対して列状に、且つ、隣り合う内部磁性体８
の外部磁性体１１に対向する極性を１つ置きに変えて配
設し、内部磁性体８に対向する外部磁性体１１の極性を
Ｓ極またはＮ極に固定（図２ではＳ極に固定）して、内
部磁性体８に対して１つおきに対応するように配設し、
このように配設した外部磁性体１１を移動装置１２によ
り現像ローラ３の長手方向に対して磁性体１個分の距離
だけ前後に移動させることにより、現像剤層厚規制部材
５の現像ローラ３に対する圧接力を調整することができ
る。As an alternative means, the moving body 12 is constituted so that the external magnetic body 11 can be moved back and forth with respect to the longitudinal direction of the developing roller 3, and as shown in FIG. 8 are arranged on the developer layer thickness regulating member 5 in a row in the longitudinal direction of the developing roller 3 and adjacent to the internal magnetic body 8.
The polarity of the external magnetic body 11 facing the internal magnetic body 8 is fixed to the S pole or the N pole (fixed to the S pole in FIG. 2). Then, it is arranged so as to correspond to every other with respect to the internal magnetic body 8,
By moving the external magnetic body 11 arranged in this manner back and forth by a distance of one magnetic body with respect to the longitudinal direction of the developing roller 3 by the moving device 12, the developing roller 3 of the developer layer thickness regulating member 5 can be moved. Can be adjusted.
【００１４】すなわち、図２の位置に外部磁性体１１が
ある場合には、内部磁性体８と外部磁性体１１の極性が
同じであるためが反発し合い、現像剤層厚規制部材５の
現像ローラ３に対する圧接力が高くなり、移動装置１２
により外部磁性体１１を現像ローラ３の長手方向に対し
て磁性体１個分の距離だけ移動させると、外部磁性体１
１に対向する内部磁性体８の極性と内部磁性体８に対向
する外部磁性体１１の極性が逆になるので吸引し合い、
現像剤層厚規制部材５の現像ローラ３に対する圧接力が
低くなるので、磁性体１個分の距離を複数のピッチに分
割し、移動装置１２を１ピッチずつ移動させるように構
成することにより、内部磁性体８の極性と内部磁性体８
に対向する外部磁性体１１の極性の反発力と吸引力の差
により、現像剤層厚規制部材５の現像ローラ３に対する
圧接力が変化するので、現像剤層厚規制部材５の現像ロ
ーラ３に対する圧接力を調整することができる。That is, when the external magnetic body 11 is located at the position shown in FIG. 2, since the internal magnetic body 8 and the external magnetic body 11 have the same polarity, they repel each other. The pressing force against the roller 3 increases, and the moving device 12
When the external magnetic body 11 is moved by a distance corresponding to one magnetic body in the longitudinal direction of the developing roller 3 by the
Since the polarity of the internal magnetic body 8 facing the internal magnetic body 8 and the polarity of the external magnetic body 11 facing the internal magnetic body 8 are reversed,
Since the pressure contact force of the developer layer thickness regulating member 5 against the developing roller 3 is reduced, the distance for one magnetic body is divided into a plurality of pitches, and the moving device 12 is moved one pitch at a time. Polarity of internal magnetic body 8 and internal magnetic body 8
The pressure contact force of the developer layer thickness regulating member 5 against the developing roller 3 changes due to the difference between the repulsive force of the polarity of the external magnetic body 11 and the attracting force facing the external magnetic body 11. The pressing force can be adjusted.
【００１５】図３は図１の現像装置の現像剤層厚規制部
材圧力調整装置を電磁石及び電流制御装置で置き換えた
例であり、現像装置１１０は、現像ケース１および現像
剤層厚規制部材圧力調整装置１０′を備えており、現像
ケース１は、現像剤２、ドラム状の現像ローラ３、板状
の現像剤層厚規制部材５、および現像剤層厚規制部材５
の上に設けられた内部磁性体８を有し、現像剤層厚規制
部材圧力調整装置１０′は電磁石１１′と、電磁石１
１′を保持する保持機構１４、および電流制御装置１５
からなり、保持機構１４は設置面１３に固設されてい
る。FIG. 3 shows an example in which the developer layer thickness regulating member pressure adjusting device of the developing device of FIG. 1 is replaced by an electromagnet and a current control device. The developing device 110 comprises a developing case 1 and a developer layer thickness regulating member pressure. The developing case 1 includes an adjusting device 10 ′, and the developing case 1 includes a developer 2, a drum-shaped developing roller 3, a plate-shaped developer layer thickness regulating member 5, and a developer layer thickness regulating member 5.
, A developer layer thickness regulating member pressure adjusting device 10 ′ includes an electromagnet 11 ′ and an electromagnet 1.
1 ′ holding mechanism, and current control device 15
The holding mechanism 14 is fixed to the installation surface 13.
【００１６】また、電磁石１１′と電流制御装置１５は
導線１６で電気的に接続され、電流制御装置１５は電磁
石１１′に与える電流の量および方向を制御可能に構成
されている。ここで、内部磁性体８の極性をＳ極或いは
Ｎ極の一方に固定し、電流制御装置１５で電磁石１１′
に与える電流の量および方向を制御すれば磁気作用によ
り現像剤層厚規制部材５の現像ローラ３に対する圧接力
が変化するので、圧接力を調整することができる。The electromagnet 11 'and the current control device 15 are electrically connected by a conducting wire 16, and the current control device 15 is configured to be able to control the amount and direction of the current applied to the electromagnet 11'. Here, the polarity of the internal magnetic body 8 is fixed to one of the S pole and the N pole, and the electromagnet 11 ′ is
By controlling the amount and direction of the current to be applied, the pressing force of the developer layer thickness regulating member 5 against the developing roller 3 is changed by the magnetic action, so that the pressing force can be adjusted.
【００１７】すなわち、電流制御装置１５で電磁石１
１′に与える電流の値を制御することにより内部磁性体
８と電磁石１１′の磁気相互作用（反発力或いは吸引
力）を変化させることができるので、現像装置１１０を
動作させながら連続的に現像剤層厚規制部材５の現像ロ
ーラ３に対する圧接力を調整することができ、調整作業
が容易になる。また、電磁石１１′に与える電流の方向
を切換えるよう制御することにより内部磁性体８に対向
する電磁石１１′の極性を切換えることができ、現像剤
層厚規制部材５の現像ローラ３に対する圧接力の調整幅
が広くなる。That is, the current controller 15 controls the electromagnet 1
Since the magnetic interaction (repulsive force or attractive force) between the internal magnetic body 8 and the electromagnet 11 ′ can be changed by controlling the value of the current applied to 1 ′, the development is continuously performed while the developing device 110 is operated. The pressing force of the agent layer thickness regulating member 5 against the developing roller 3 can be adjusted, and the adjustment work becomes easy. Further, by controlling the direction of the current applied to the electromagnet 11 ′, the polarity of the electromagnet 11 ′ facing the internal magnetic body 8 can be switched, and the pressure contact force of the developer layer thickness regulating member 5 against the developing roller 3 can be changed. The adjustment range becomes wider.
【００１８】上記実施例から明らかなように、現像ユニ
ットの外部に現像剤層厚規制部材圧力調整装置を設けた
ことにより現像ローラ上の現像剤薄層厚の調整を外部か
ら行なうことができるので、現像ローラに付着した現像
剤を均一な層として形成することが容易になる。As is clear from the above embodiment, the provision of the developer layer thickness regulating member pressure adjusting device outside the developing unit allows the thickness of the developer thin layer on the developing roller to be adjusted from the outside. Further, it becomes easy to form the developer adhered to the developing roller as a uniform layer.
【００１９】[0019]
【発明の効果】以上説明したように本発明によれば、現
像ユニットの外部と内部に磁性体を設け、その反発力或
いは吸引力を調整して現像ユニットの外部から現像剤層
厚規制部材の現像ローラへの圧接力を調整することがで
きる。As described above, according to the present invention, a magnetic material is provided on the outside and inside of the developing unit, and the repulsive force or suction force is adjusted to control the developer layer thickness regulating member from outside the developing unit. The pressing force to the developing roller can be adjusted.
【００２０】また、現像剤層厚規制部材圧力調整装置を
可動に構成することにより、磁性体の反発力或いは吸引
力の調整が容易になり、現像剤層厚規制部材の現像ロー
ラに対する圧接力を変化させることができるので、現像
ローラ上の現像剤薄層厚の微調整を外部から行なうこと
ができる。Further, by making the pressure regulating device of the developer layer thickness regulating member movable, it becomes easy to adjust the repulsive force or suction force of the magnetic material, and the pressure contact force of the developer layer thickness regulating member against the developing roller is reduced. Since the thickness can be changed, fine adjustment of the thickness of the developer thin layer on the developing roller can be performed from the outside.
【００２１】また、外部磁性体を電磁石とし、電流制御
装置により電磁石に与える電流の値と方向の切換えを制
御することにより、さらに、磁性体の反発力或いは吸引
力の調整が容易になり、現像剤層厚規制部材の現像ロー
ラに対する圧接力の調整幅が広くなる。Further, by controlling the switching of the value and direction of the current applied to the electromagnet by the current control device by using an external magnet as an electromagnet, the repulsive force or attractive force of the magnetic material can be easily adjusted, and the The adjustment range of the pressing force of the agent layer thickness regulating member against the developing roller is widened.
【００２２】以上により、現像ローラ上の現像剤層の厚
さの調整を、現像ユニットの外部から行なうことができ
るので、現像ユニットの分解や交換を要することなく、
良質な画像を得ることができる。As described above, the thickness of the developer layer on the developing roller can be adjusted from the outside of the developing unit, so that the developing unit is not required to be disassembled or replaced.
High quality images can be obtained.
【図１】本発明の画像形成装置の一実施例の要部の構成
を示す図である。FIG. 1 is a diagram showing a configuration of a main part of an embodiment of an image forming apparatus of the present invention.
【図２】外部磁性体と内部磁性体の配置および極性の対
応状態の説明図である。FIG. 2 is an explanatory diagram of a corresponding state of arrangement and polarities of an external magnetic body and an internal magnetic body.
【図３】本発明の画像形成装置の他の実施例の要部の構
成を示す図である。FIG. 3 is a diagram showing a configuration of a main part of another embodiment of the image forming apparatus of the present invention.
【図４】画像形成装置における現像ローラ上の現像剤薄
層形成技術の従来例を示す図である。FIG. 4 is a diagram showing a conventional example of a technique for forming a thin developer layer on a developing roller in an image forming apparatus.
１ 現像ケース（現像ユニット） ２ 現像剤 ３ 現像ローラ ５ 現像剤層厚規制部材 ８ 内部磁性体（磁性体） １１ 外部磁性体（磁性体） １１′ 電磁石（外部磁性体：磁性体） １５ 電流制御装置 REFERENCE SIGNS LIST 1 developing case (developing unit) 2 developer 3 developing roller 5 developer layer thickness regulating member 8 internal magnetic material (magnetic material) 11 external magnetic material (magnetic material) 11 ′ electromagnet (external magnetic material: magnetic material) 15 current control apparatus
Claims (7)
該現像剤を感光体に供給する現像剤担持体と、該現像剤
担持体に担持された現像剤を押圧して現像剤薄層を形成
する現像剤層厚規制部材と、を有する画像形成装置にお
いて、 上記現像剤層厚規制部材上に内部磁性体を設け、上記現
像ユニット外の上記内部磁性体と対向する位置に外部磁
性体を設け、両磁性体相互間に作用する磁力を可変とし
たことを特徴とする画像形成装置。1. A powdery developer in a developing unit,
An image forming apparatus comprising: a developer carrying member that supplies the developer to a photoreceptor; and a developer layer thickness regulating member that presses the developer carried by the developer carrying member to form a developer thin layer. In the above, an internal magnetic body is provided on the developer layer thickness regulating member, an external magnetic body is provided at a position facing the internal magnetic body outside the developing unit, and a magnetic force acting between both magnetic bodies is made variable. An image forming apparatus comprising:
と共に、該外部磁性体と上記内部磁性体の対向する磁極
が共に同じ極性を有することを特徴とする請求項１記載
の画像形成装置。2. The image forming apparatus according to claim 1, wherein the external magnetic body is configured to be movable, and opposite magnetic poles of the external magnetic body and the internal magnetic body have the same polarity. .
と共に、該外部磁性体と上記内部磁性体の対向する磁極
が互に逆の極性を有することを特徴とする請求項１記載
の画像形成装置。3. The image according to claim 1, wherein the external magnetic body is configured to be movable, and opposite magnetic poles of the external magnetic body and the internal magnetic body have opposite polarities. Forming equipment.
加える電流値および電流の方向を制御する電流制御装置
を設け、上記外部磁性体の磁力の大きさおよび磁極の極
性を電流値および電流の方向を制御することによって上
記画像担持体に対する上記現像剤層厚規制部材の圧接力
を変化させることを特徴とする請求項１から３のいずれ
かに記載の画像形成装置。4. The external magnetic body is an electromagnet, and a current control device for controlling a current value and a direction of the current applied to the electromagnet is provided, and the magnitude of the magnetic force and the polarity of the magnetic pole of the external magnetic body are determined by the current value and the current. The image forming apparatus according to claim 1, wherein a pressing force of the developer layer thickness regulating member against the image carrier is changed by controlling a direction of the image carrier.
該現像剤を感光体に供給する現像剤担持体と、該現像剤
担持体に担持された現像剤を押圧して現像剤薄層を形成
する現像剤層厚規制部材と、を有する画像形成装置にお
いて、上記現像剤層厚規制部材上に内部磁性体を設け、
上記現像ユニット外の該内部磁性体に対向する位置に設
けた外部磁性体からの磁気作用を変化させて、上記画像
担持体に対する上記現像剤層厚規制部材の圧接力を調整
することを特徴とする現像剤層厚規制部材の圧接力調整
方法。5. A powdery developer in a developing unit,
An image forming apparatus comprising: a developer carrying member that supplies the developer to a photoreceptor; and a developer layer thickness regulating member that presses the developer carried by the developer carrying member to form a developer thin layer. In, providing an internal magnetic body on the developer layer thickness regulating member,
The pressure acting force of the developer layer thickness regulating member against the image carrier is adjusted by changing a magnetic action from an external magnetic body provided at a position facing the internal magnetic body outside the developing unit. A method for adjusting the pressing force of the developer layer thickness regulating member.
部磁性体と内部磁性体との距離を変化させて、上記圧接
力を調整することを特徴とする請求項５記載の現像剤層
厚規制部材の圧接力調整方法。6. The developer layer thickness according to claim 5, wherein said pressing force is adjusted by making said external magnetic body movable and changing a distance between said external magnetic body and said internal magnetic body. A method for adjusting the pressing force of the regulating member.
磁性体の磁力の大きさ及び／又は磁極の極性を、上記外
部磁性体に加える電流値および電流の方向を制御するこ
とによって上記圧接力を変化させることを特徴とする請
求項５又は６記載の現像剤層厚規制部材の圧接力調整方
法。7. The pressing force by controlling the magnitude and / or polarity of a magnetic force of the external magnetic body by controlling a current value and a direction of a current applied to the external magnetic body. 7. The method for adjusting the pressing force of the developer layer thickness regulating member according to claim 5, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14297397A JPH10319714A (en) | 1997-05-19 | 1997-05-19 | Pressure contacting force adjusting method for image forming device and developer layer thickness regulating member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14297397A JPH10319714A (en) | 1997-05-19 | 1997-05-19 | Pressure contacting force adjusting method for image forming device and developer layer thickness regulating member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10319714A true JPH10319714A (en) | 1998-12-04 |
Family
ID=15327969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14297397A Pending JPH10319714A (en) | 1997-05-19 | 1997-05-19 | Pressure contacting force adjusting method for image forming device and developer layer thickness regulating member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10319714A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7787808B2 (en) | 2007-02-22 | 2010-08-31 | Sharp Kabushiki Kaisha | Developing device and image forming apparatus |
-
1997
- 1997-05-19 JP JP14297397A patent/JPH10319714A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7787808B2 (en) | 2007-02-22 | 2010-08-31 | Sharp Kabushiki Kaisha | Developing device and image forming apparatus |
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