JPH09258528A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH09258528A JPH09258528A JP8066956A JP6695696A JPH09258528A JP H09258528 A JPH09258528 A JP H09258528A JP 8066956 A JP8066956 A JP 8066956A JP 6695696 A JP6695696 A JP 6695696A JP H09258528 A JPH09258528 A JP H09258528A
- Authority
- JP
- Japan
- Prior art keywords
- corona discharge
- discharge wire
- voltage
- cleaning
- image forming
- 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.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 6
- 108091008695 photoreceptors Proteins 0.000 abstract description 4
- 238000004904 shortening Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、像担持体や転写材等
の被帯電体を帯電するコロナ放電ワイヤと、このコロナ
放電ワイヤを清掃する清掃部材とを備えた画像形成装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus provided with a corona discharge wire for charging an object to be charged such as an image carrier and a transfer material, and a cleaning member for cleaning the corona discharge wire.
【０００２】[0002]
【従来の技術】例えば、電子写真方式の複写機、プリン
タ等の画像形成装置においては、像担持体表面の一様帯
電、転写材への転写帯電、分離帯電等を行う帯電装置と
してコロナ帯電装置が広く用いられている。コロナ帯電
装置は、高電圧を印加したコロナ放電ワイヤと該放電ワ
イヤに対向したシールド電極との間に発生する強い電界
によって生じるコロナ放電現象で発生した電荷を利用し
て、像担持体や転写材等の被帯電物を帯電あるいは除電
する。2. Description of the Related Art For example, in an image forming apparatus such as an electrophotographic copying machine or a printer, a corona charging device is used as a charging device for uniformly charging the surface of an image bearing member, transfer charging to a transfer material, and separation charging. Is widely used. The corona charging device utilizes an electric charge generated by a corona discharge phenomenon generated by a strong electric field generated between a corona discharge wire to which a high voltage is applied and a shield electrode facing the discharge wire, to use an image carrier or a transfer material. Charges or removes the charged object such as.
【０００３】そして、このコロナ放電ワイヤにはコロナ
放電によって発生した生成物や画像形成装置内部に存在
する塵埃、浮遊トナーなどの異物が付着する。そしてこ
の付着によってコロナ放電ワイヤの放電ムラが発生し画
質の劣化を招く。このため従来より、このようなコロナ
帯電装置の放電ムラを解決するためにコロナ放電ワイヤ
の表面を自動的に清掃する清掃手段を具備し該清掃手段
を所定の間隔で定期的に動作させることが提案されてい
る。しかしながら、このように清掃手段を定期的に動作
させた場合、環境によってコロナ放電ワイヤの汚れの速
度が異なるためコロナ帯電装置の放電ムラは防止できな
かった。Then, foreign substances such as products generated by corona discharge, dust existing inside the image forming apparatus, and floating toner adhere to the corona discharge wire. Then, due to the adhesion, discharge unevenness of the corona discharge wire occurs, which causes deterioration of image quality. Therefore, conventionally, in order to solve such discharge unevenness of the corona charging device, a cleaning means for automatically cleaning the surface of the corona discharge wire is provided, and the cleaning means can be regularly operated at predetermined intervals. Proposed. However, when the cleaning means is regularly operated in this way, it is not possible to prevent the discharge unevenness of the corona charging device because the dirt speed of the corona discharge wire varies depending on the environment.
【０００４】そこで、このような問題を解決するため、
コロナ放電ワイヤの清掃手段による清掃間隔を使用環境
や使用状況に応じて設定する設定手段を備えたものが提
案されている（例えば特開平６−２８２１５２号公報参
照）。Therefore, in order to solve such a problem,
It has been proposed that a corona discharge wire is provided with a setting unit for setting a cleaning interval by a cleaning unit according to a use environment or a use situation (see, for example, Japanese Patent Laid-Open No. 6-282152).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記従
来技術では、コロナ放電ワイヤの汚れの速度を操作者が
予測するか、環境状態をセンサにより検出して自動的に
コロナ放電ワイヤの汚れの速度を予測して、これらの予
測に基づいてコロナ放電ワイヤの清掃間隔を決定してい
るため、実際のコロナ放電ワイヤの汚れの速度と予測に
よるコロナ放電ワイヤの汚れの速度が合致せず、その結
果コロナ放電ワイヤの清掃過多や清掃過少が発生し、コ
ロナ放電ワイヤや清掃部材の寿命が短くなったり、コロ
ナ放電ワイヤによる帯電ムラのために画像の濃度ムラや
転写不良が発生するという問題点があった。However, in the above-mentioned prior art, the operator predicts the speed of dirt on the corona discharge wire, or the environmental condition is detected by a sensor to automatically detect the speed of dirt on the corona discharge wire. Since the prediction and the corona discharge wire cleaning intervals are determined based on these predictions, the actual corona discharge wire fouling rate does not match the predicted corona discharge wire fouling rate, resulting in a corona There was a problem that the discharge wire was over-cleaned or under-cleaned, the life of the corona discharge wire and the cleaning member was shortened, and uneven density of images and transfer defects occurred due to uneven charging of the corona discharge wire. .
【０００６】この発明は、上記の問題点に鑑みてなされ
たものであり、コロナ放電ワイヤや清掃部材の寿命を損
なうことなく、画像の濃度ムラや転写不良の発生を防止
した画像形成装置を提供することを目的とする。The present invention has been made in view of the above problems, and provides an image forming apparatus which prevents the occurrence of image density unevenness and transfer failure without impairing the life of the corona discharge wire and the cleaning member. The purpose is to do.
【０００７】この発明の他の目的は、コロナ放電ワイヤ
に異物が強固に付着するのを防止することができる画像
形成装置を提供することを目的とする。Another object of the present invention is to provide an image forming apparatus capable of preventing foreign matter from firmly adhering to a corona discharge wire.
【０００８】本発明の他の目的は、コロナ放電ワイヤの
交換時期を適切に表示できる画像形成装置を提供するこ
とを目的とする。Another object of the present invention is to provide an image forming apparatus capable of appropriately displaying the replacement time of the corona discharge wire.
【０００９】[0009]
【課題を解決するための手段】この発明は上記の目的を
達成するため、像担持体又はこの像担持体の像が転写さ
れる転写材を帯電するコロナ放電ワイヤと、前記コロナ
放電ワイヤを清掃する清掃部材と、を有する画像形成装
置において、前記コロナ放電ワイヤに電圧を印加する電
源であって所定の電流を流すべく制御される定電流電源
と、前記定電流電源の印加電圧を検出する電圧検出手段
と、前記電圧検出手段により検出された帯電時の電圧変
動幅が予め定められた基準電圧変動幅を越えた場合に前
記清掃部材を動作させる制御手段と、を有することを特
徴とする画像形成装置を提供するものである。In order to achieve the above object, the present invention cleans the corona discharge wire for charging the image carrier or the transfer material on which the image of the image carrier is transferred, and the corona discharge wire. In the image forming apparatus having a cleaning member, a constant current power source for applying a voltage to the corona discharge wire, which is controlled to flow a predetermined current, and a voltage for detecting an applied voltage of the constant current power source. An image comprising: a detection unit; and a control unit that operates the cleaning member when the voltage fluctuation width at the time of charging detected by the voltage detection unit exceeds a predetermined reference voltage fluctuation width. A forming apparatus is provided.
【００１０】また、同様な画像形成装置において、前記
制御手段は、前記電圧検出手段により検出された帯電時
の電圧変動幅が予め定められた基準電圧変動幅を越えな
い場合であっても、予め定められた所定の間隔で前記清
掃部材を動作させることを特徴とする画像形成装置を提
供するものである。Further, in the same image forming apparatus, the control means preliminarily sets the voltage fluctuation width at the time of charging detected by the voltage detection means even if it does not exceed a predetermined reference voltage fluctuation width. The image forming apparatus is characterized in that the cleaning member is operated at a predetermined interval.
【００１１】また、同様な画像形成装置において、前記
検出手段により検出された帯電時の電圧変動幅が予め定
められた基準電圧変動幅を越えた場合に行われる清掃の
間隔が、予め定められた所定の間隔よりも小さくなった
場合には前記コロナ放電ワイヤの交換を促す表示を行う
ことを特徴とする画像形成装置を提供するものである。Further, in the same image forming apparatus, the cleaning interval performed when the voltage fluctuation width at the time of charging detected by the detecting means exceeds the predetermined reference voltage fluctuation width is predetermined. The present invention provides an image forming apparatus characterized in that a display prompting replacement of the corona discharge wire is displayed when the distance becomes smaller than a predetermined interval.
【００１２】[0012]
【作用】この発明によれば、コロナ放電ワイヤの汚れに
対応したコロナ放電ワイヤの振動によって発生する、コ
ロナ放電ワイヤに電圧を印加する定電流電源の印加電圧
の電圧変動幅が、予め定められた基準電圧変動幅を越え
た場合に清掃部材を動作させる。従って、コロナ放電ワ
イヤが汚れた場合にのみ清掃部材が動作することとな
り、清掃不十分や清掃過多が発生しない。According to the present invention, the voltage fluctuation width of the applied voltage of the constant current power source for applying the voltage to the corona discharge wire, which is generated by the vibration of the corona discharge wire corresponding to the dirt of the corona discharge wire, is predetermined. When the reference voltage fluctuation width is exceeded, the cleaning member is operated. Therefore, the cleaning member operates only when the corona discharge wire becomes dirty, and insufficient cleaning or excessive cleaning does not occur.
【００１３】また、この発明によれば、定電流電源の印
加電圧の電圧変動幅が予め定められた基準電圧変動幅を
越えない場合であっても、予め定められた所定の間隔で
前記清掃部材を動作させる。従って、高温高湿の環境下
で発生しやすい、放電時間が長くなることによる異物の
コロナ放電ワイヤへの強固な付着を防止することができ
る。Further, according to the present invention, even when the voltage fluctuation width of the applied voltage of the constant current power source does not exceed the predetermined reference voltage fluctuation width, the cleaning member is provided at predetermined intervals. To operate. Therefore, it is possible to prevent the foreign matter from firmly adhering to the corona discharge wire due to the long discharge time, which is likely to occur in a high temperature and high humidity environment.
【００１４】また、この発明によれば、定電流電源の印
加電圧の電圧変動幅が予め定められた基準電圧変動幅を
越えた場合に行われる清掃の間隔が、予め定められた所
定の間隔よりも小さくなった場合にコロナ放電ワイヤの
交換を促す表示を行う。従って、放電時間の増加と共に
劣化が進行するコロナ放電ワイヤの適切な寿命を表示す
ることができる。Further, according to the present invention, the cleaning interval performed when the voltage fluctuation width of the applied voltage of the constant current power supply exceeds the predetermined reference voltage fluctuation width is larger than the predetermined predetermined interval. If it becomes too small, a display will be displayed to prompt replacement of the corona discharge wire. Therefore, it is possible to display an appropriate life of the corona discharge wire whose deterioration progresses as the discharge time increases.
【００１５】[0015]
【実施例】以下、この発明の実施例を添付の図面に基づ
いて具体的に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
【００１６】まず、本発明の第１の実施例を次に示す。
図１は、本発明の画像形成装置の実施例を示す概略構成
図である。図示するように、画像形成装置は、像担持体
である感光体１の周囲に、帯電装置２、露光装置３、現
像装置４、転写装置５、クリーニング装置６が図中矢印
で示す感光体１の回転方向に沿って配設されている。画
像形成を行う際には、感光体１が回転し、帯電装置２が
その表面を順次帯電し、露光装置３がその表面に画像に
対応した光を照射してその表面に静電潜像を形成し、現
像装置４が静電潜像にトナーを与え静電潜像対応のトナ
ー像を生成する。静電潜像の画像先端に記録紙の先端を
合わせるように図示しない給紙装置が転写材である記録
紙７を送り出し、転写帯電器５によってトナー像が記録
紙７に転写され、記録紙７は感光体１から離されて定着
装置８に送られる。そして、トナー像の転写を終えた感
光体１表面はクリーニング装置６で清掃される。First, a first embodiment of the present invention will be described below.
FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention. As shown in the figure, in the image forming apparatus, a charging device 2, an exposure device 3, a developing device 4, a transfer device 5, and a cleaning device 6 are surrounded by a photoconductor 1 which is an image carrier, and the photoconductor 1 is indicated by an arrow in the figure. Are arranged along the direction of rotation. When forming an image, the photoreceptor 1 rotates, the charging device 2 sequentially charges the surface thereof, and the exposure device 3 irradiates the surface with light corresponding to an image to form an electrostatic latent image on the surface. Then, the developing device 4 applies toner to the electrostatic latent image to form a toner image corresponding to the electrostatic latent image. A sheet feeding device (not shown) sends out the recording sheet 7 as a transfer material so that the leading edge of the recording sheet is aligned with the leading edge of the electrostatic latent image, and the toner image is transferred to the recording sheet 7 by the transfer charger 5 and the recording sheet 7 is transferred. Is separated from the photoconductor 1 and sent to the fixing device 8. Then, the surface of the photoreceptor 1 after the transfer of the toner image is cleaned by the cleaning device 6.
【００１７】図２に、帯電装置２及びその清掃装置の要
部断面図を示す。帯電装置２は、コロナ放電ワイヤ１
１、シールド板１２から構成され、コロナ放電ワイヤ１
１を清掃する清掃装置は、清掃部材１３、清掃部材１３
を保持する清掃部材支持部材１４、清掃部材支持部材１
４と螺合し紙面垂直方向に延びるリードスクリュ１５か
ら構成される。感光体１の表面の帯電時、定電流電源１
６によりコロナ放電ワイヤ１１に６〜８ｋＶ程度の高電
圧が印加されて感光体１を均一に帯電する。また、コロ
ナ放電ワイヤ１１の清掃時、駆動モータ１９によりリー
ドスクリュ１６が回転し、清掃部材支持部材１４が紙面
垂直方向に移動して、コロナ放電ワイヤ１１を挟持して
いる清掃部材１３によりコロナ放電ワイヤ１１が清掃さ
れる。清掃部材１３は、例えば発泡樹脂による弾性部材
であり、その弾性部材が研磨材を備えていても良い。FIG. 2 shows a sectional view of the main parts of the charging device 2 and its cleaning device. The charging device 2 is a corona discharge wire 1.
1. Corona discharge wire 1 composed of shield plate 12
The cleaning device for cleaning 1 includes a cleaning member 13, a cleaning member 13
Cleaning member supporting member 14, which holds the cleaning member, and cleaning member supporting member 1
4 and a lead screw 15 extending in the direction perpendicular to the plane of the drawing. Constant current power supply 1 when the surface of the photoconductor 1 is charged
6, a high voltage of about 6 to 8 kV is applied to the corona discharge wire 11 to uniformly charge the photoconductor 1. During cleaning of the corona discharge wire 11, the drive motor 19 rotates the lead screw 16 to move the cleaning member support member 14 in the direction perpendicular to the plane of the drawing, so that the cleaning member 13 holding the corona discharge wire 11 causes the corona discharge. The wire 11 is cleaned. The cleaning member 13 is, for example, an elastic member made of foamed resin, and the elastic member may include an abrasive.
【００１８】ところで、上述のようにコロナ放電ワイヤ
１１にはコロナ放電によって発生した生成物や画像形成
装置内部に存在する塵埃、浮遊トナーなどの異物が付着
する。そして、コロナ放電ワイヤ１１に異物が付着する
とコロナ放電ワイヤ１１の放電ムラが発生し画質の劣化
を招く。ここで、コロナ放電ワイヤ１１に異物が付着し
た場合、コロナ放電中にコロナ放電ワイヤ１１が振動す
ることとなる。そして、この振動によってコロナ放電ワ
イヤ１１と感光体１、シールド板１２との間の距離が変
化する。すると、定電流電源１６のように電源が常時一
定の電流を流すべく定電流制御されている場合には、上
述の距離の変化によって図３に示すように印加電圧が変
化する。従って、この印加電圧の変化を検出することに
よってコロナ放電ワイヤ１１の汚れの程度を検出するこ
とができる。本実施例においては、図２に示すようにそ
の印加電圧の変動幅ΔＶ1を周知の電圧変動幅検知手段
１７により検出し、周知の制御回路１８へ信号を送る。
制御回路１８では、印加電圧の変動幅ΔＶ1と予め設定
された基準変動幅ΔＶ0とを比較し、ΔＶ1がΔＶ0より
も大きくなった時に駆動モータ１９へ駆動信号を送りコ
ロナ放電ワイヤ１１の清掃を行わせる。本実施例では、
基準変動幅ΔＶ0を５００Ｖに設定し実験を行ったとこ
ろ清掃過小や清掃過多が発生せず適切なタイミングで清
掃を行うことができた。By the way, as described above, foreign matter such as products generated by corona discharge, dust existing inside the image forming apparatus, and floating toner adheres to the corona discharge wire 11. Then, if foreign matter adheres to the corona discharge wire 11, discharge unevenness of the corona discharge wire 11 occurs and the image quality deteriorates. Here, when foreign matter adheres to the corona discharge wire 11, the corona discharge wire 11 vibrates during corona discharge. Then, due to this vibration, the distance between the corona discharge wire 11 and the photoconductor 1 and the shield plate 12 changes. Then, when the power supply is constant current controlled so that a constant current always flows like the constant current power supply 16, the applied voltage changes as shown in FIG. 3 due to the change in the distance. Therefore, the degree of contamination of the corona discharge wire 11 can be detected by detecting the change in the applied voltage. In this embodiment, as shown in FIG. 2, the variation width ΔV 1 of the applied voltage is detected by the well-known voltage variation width detecting means 17, and a signal is sent to the well-known control circuit 18.
The control circuit 18 compares the variation width ΔV 1 of the applied voltage with a preset reference variation width ΔV 0, and when ΔV 1 becomes larger than ΔV 0 , sends a drive signal to the drive motor 19 and outputs the corona discharge wire 11 Have them be cleaned. In this embodiment,
When the reference fluctuation width ΔV 0 was set to 500 V and an experiment was conducted, it was possible to carry out cleaning at an appropriate timing without causing excessive or excessive cleaning.
【００１９】次に本発明の第２の実施例を示す。第２の
実施例が第１の実施例と異なる点は、コロナ放電ワイヤ
の清掃タイミングとして新たなタイミングを付加した点
にある。即ち、第１の実施例では、コロナ放電ワイヤ１
１への異物付着量の速度が小さい場合、コロナ放電ワイ
ヤ１１の清掃間隔は長くなる。しかしながら、コロナ放
電ワイヤ１１の清掃間隔が長くなった場合、異物の付着
量は少なくても、放電時間が長くなることにより異物の
付着力が強固になることがある。これは高温高湿の環境
下で発生しやすい。そして、このような強固な付着が発
生した場合には、清掃部材１３によっても清掃すること
ができなくなってしまう。従って、このようなコロナ放
電ワイヤへの異物の強固な付着を防止するためには、所
定の間隔で清掃を行うタイミングを追加すればよい。よ
って、本実施例では第４図に示すように印加電圧の変動
幅ΔＶ1が基準変動幅ΔＶ0を越えない場合であっても、
前回の清掃時からの画像形成回数が予め設定した基準画
像形成回数に達した場合には清掃動作を行わせる構成と
した。これによって、使用環境に対応した更に適切なタ
イミングで清掃動作を行うことができるようになった。
尚、上記実施例では清掃動作を行わせる間隔として所定
の画像形成回数毎としたが、これは所定時間毎としても
同様の効果が得られる。Next, a second embodiment of the present invention will be shown. The second embodiment differs from the first embodiment in that a new timing is added as the cleaning timing of the corona discharge wire. That is, in the first embodiment, the corona discharge wire 1
When the speed of the amount of foreign matter adhered to 1 is small, the cleaning interval of the corona discharge wire 11 becomes long. However, when the cleaning interval of the corona discharge wire 11 becomes long, the adhesion force of the foreign matter may become strong due to the longer discharge time even if the foreign matter adhesion amount is small. This easily occurs in a high temperature and high humidity environment. When such strong adhesion occurs, the cleaning member 13 cannot be used for cleaning. Therefore, in order to prevent such a strong adhesion of foreign matter to the corona discharge wire, it is only necessary to add a timing for cleaning at a predetermined interval. Therefore, in this embodiment, even when the variation width ΔV 1 of the applied voltage does not exceed the reference variation width ΔV 0 as shown in FIG.
The cleaning operation is performed when the number of times of image formation since the last cleaning reaches a preset reference number of times of image formation. As a result, the cleaning operation can be performed at a more appropriate timing corresponding to the usage environment.
In the above embodiment, the cleaning operation is performed every predetermined number of times of image formation. However, the same effect can be obtained even when the cleaning operation is performed every predetermined time.
【００２０】次に本発明の第３の実施例を示す。第３の
実施例が第１の実施例と異なる点は、コロナ放電ワイヤ
の交換タイミングを表示する構成を付加した点である。
即ち、コロナ放電ワイヤ１１はその放電時間の増加と共
に汚れが蓄積して劣化が進行する。従って、第５図に示
すようにコロナ放電ワイヤの放電時間の増加と共に、清
掃終了時から次回の清掃が必要となる迄の間に画像形成
を行うことができる回数は減少していく。そして、つい
には清掃しても帯電性能が回復しない寿命を迎える。従
って、本実施例では第６図に示すように、印加電圧の変
動幅ΔＶ1が基準変動幅ΔＶ0より大きくなった時点で、
前回の清掃時からの画像形成回数を予め定められた下限
画像形成回数と比較し、前回の清掃時からの画像形成回
数が下限画像形成回数よりも少なくなった場合には、コ
ロナ放電ワイヤ１１の交換を促す表示を行う。これによ
り、コロナ放電ワイヤ１１の適切な交換時期を表示する
ことが可能となった。Next, a third embodiment of the present invention will be shown. The third embodiment differs from the first embodiment in that a configuration for displaying the corona discharge wire replacement timing is added.
That is, as the discharge time increases, the corona discharge wire 11 accumulates dirt and deteriorates. Therefore, as shown in FIG. 5, as the discharge time of the corona discharge wire increases, the number of times that image formation can be performed from the end of cleaning until the next cleaning is required decreases. And finally, it reaches the end of its life in which the charging performance is not recovered even after cleaning. Therefore, in this embodiment, as shown in FIG. 6, when the variation width ΔV 1 of the applied voltage becomes larger than the reference variation width ΔV 0 ,
The number of times of image formation since the last cleaning is compared with a predetermined lower limit number of times of image formation, and when the number of times of image formation after the last cleaning becomes less than the lower limit of number of image formation, the corona discharge wire 11 Display a message prompting replacement. As a result, it becomes possible to display the proper replacement time of the corona discharge wire 11.
【００２１】[0021]
【発明の効果】以上説明したように、この発明によれ
ば、コロナ放電ワイヤが汚れた場合にのみ清掃部材を動
作させることで、帯電部材や清掃部材の寿命を損なうこ
となくコロナ放電ワイヤによる帯電ムラが防止でき、画
像の濃度ムラや転写不良の発生を防止した画像形成装置
を提供することが可能となる。As described above, according to the present invention, the cleaning member is operated only when the corona discharge wire is contaminated, so that the charging by the corona discharge wire is performed without impairing the life of the charging member and the cleaning member. It is possible to provide an image forming apparatus capable of preventing unevenness and preventing unevenness in image density and transfer failure.
【００２２】また、この発明によれば、予め定められた
所定の間隔で清掃部材を動作させることで、異物のコロ
ナ放電ワイヤへの強固な付着を防止することができ、コ
ロナ放電ワイヤの良好な清掃を行うことができる画像形
成装置を提供することが可能となる。Further, according to the present invention, by operating the cleaning member at a predetermined interval, it is possible to prevent foreign matter from firmly adhering to the corona discharge wire, and to improve the corona discharge wire. It is possible to provide an image forming apparatus that can be cleaned.
【００２３】また、この発明によれば、放電時間の増加
と共に劣化が進行するコロナ放電ワイヤの適切な寿命を
表示することができる画像形成装置を提供することが可
能となる。Further, according to the present invention, it is possible to provide an image forming apparatus capable of displaying an appropriate life of a corona discharge wire whose deterioration progresses as the discharge time increases.
【図１】本発明の画像形成装置の一実施例を示す概略構
成図である。FIG. 1 is a schematic configuration diagram showing one embodiment of an image forming apparatus of the present invention.
【図２】本発明の第１の実施例の説明に供するコロナ放
電ワイヤと清掃部材を備えた帯電装置の要部断面図であ
る。FIG. 2 is a cross-sectional view of a main part of a charging device provided with a corona discharge wire and a cleaning member, which is used for explaining the first embodiment of the present invention.
【図３】本発明の第１の実施例の説明に供する定電流電
源に印加される供給電圧のコロナ放電ワイヤが汚れた際
の変動を示す説明図である。FIG. 3 is an explanatory diagram showing a variation of the supply voltage applied to the constant current power supply when the corona discharge wire is soiled, which is used in the description of the first embodiment of the present invention.
【図４】本発明の第２の実施例の特徴を表すフローチャ
ートである。FIG. 4 is a flowchart showing the characteristics of the second exemplary embodiment of the present invention.
【図５】本発明の第３の実施例の説明に供するコロナ放
電ワイヤの限界清掃間隔の変化を示す説明図である。FIG. 5 is an explanatory diagram showing a change in a critical cleaning interval of a corona discharge wire used for explaining a third embodiment of the present invention.
【図６】本発明の第３の実施例の特徴を表すフローチャ
ートである。FIG. 6 is a flowchart showing the characteristics of the third exemplary embodiment of the present invention.
１ 感光体 ２ 帯電装置 ５ 転写装置 １１ コロナ放電ワイヤ １３ 清掃部材 １６ 定電流電源 １７ 電圧変動幅検出手段 １８ 制御手段 1 Photoreceptor 2 Charging Device 5 Transfer Device 11 Corona Discharge Wire 13 Cleaning Member 16 Constant Current Power Supply 17 Voltage Fluctuation Width Detection Means 18 Control Means
Claims (3)
る転写材を帯電するコロナ放電ワイヤと、前記コロナ放
電ワイヤを清掃する清掃部材と、を有する画像形成装置
において、前記コロナ放電ワイヤに電圧を印加する電源
であって所定の電流を流すべく制御される定電流電源
と、前記定電流電源の印加電圧を検出する電圧検出手段
と、前記電圧検出手段により検出された帯電時の電圧変
動幅が予め定められた基準電圧変動幅を越えた場合に前
記清掃部材を動作させる制御手段と、を有することを特
徴とする画像形成装置。1. An image forming apparatus comprising: a corona discharge wire for charging an image carrier or a transfer material onto which an image of the image carrier is transferred; and a cleaning member for cleaning the corona discharge wire. A constant current power source that applies a voltage to the wire and is controlled to flow a predetermined current, a voltage detection unit that detects an applied voltage of the constant current power source, and a charging time detected by the voltage detection unit. An image forming apparatus comprising: a control unit that operates the cleaning member when the voltage fluctuation range exceeds a predetermined reference voltage fluctuation range.
検出された帯電時の電圧変動幅が予め定められた基準電
圧変動幅を越えない場合であっても、予め定められた所
定の間隔で前記清掃部材を動作させることを特徴とする
請求項１記載の画像形成装置。2. The control means sets a predetermined interval even when the voltage fluctuation width at the time of charging detected by the voltage detecting means does not exceed a predetermined reference voltage fluctuation width. The image forming apparatus according to claim 1, wherein the cleaning member is operated.
圧変動幅が予め定められた基準電圧変動幅を越えた場合
に行われる清掃の間隔が、予め定められた所定の間隔よ
りも小さくなった場合には、前記コロナ放電ワイヤの交
換を促す表示を行うことを特徴とする請求項１または請
求項２記載の画像形成装置。3. The cleaning interval performed when the voltage fluctuation width at the time of charging detected by the detecting means exceeds a predetermined reference voltage fluctuation width is smaller than a predetermined interval. The image forming apparatus according to claim 1, further comprising a display for prompting replacement of the corona discharge wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06695696A JP3461659B2 (en) | 1996-03-22 | 1996-03-22 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06695696A JP3461659B2 (en) | 1996-03-22 | 1996-03-22 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09258528A true JPH09258528A (en) | 1997-10-03 |
| JP3461659B2 JP3461659B2 (en) | 2003-10-27 |
Family
ID=13330994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06695696A Expired - Fee Related JP3461659B2 (en) | 1996-03-22 | 1996-03-22 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3461659B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7664423B2 (en) | 2004-10-29 | 2010-02-16 | Murata Machinery, Ltd. | Image forming device including a cleaning member |
| WO2011024658A1 (en) * | 2009-08-31 | 2011-03-03 | 村田機械株式会社 | Image forming apparatus and image forming method |
| US8301044B2 (en) | 2008-09-26 | 2012-10-30 | Brother Kogyo Kabushiki Kaisha | Image forming devices including electrification control units |
| CN103135397A (en) * | 2011-11-28 | 2013-06-05 | 夏普株式会社 | Image forming apparatus and cleaning control method |
| JP2019061109A (en) * | 2017-09-27 | 2019-04-18 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP2020154034A (en) * | 2019-03-18 | 2020-09-24 | コニカミノルタ株式会社 | Image formation apparatus and program |
-
1996
- 1996-03-22 JP JP06695696A patent/JP3461659B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7664423B2 (en) | 2004-10-29 | 2010-02-16 | Murata Machinery, Ltd. | Image forming device including a cleaning member |
| US8301044B2 (en) | 2008-09-26 | 2012-10-30 | Brother Kogyo Kabushiki Kaisha | Image forming devices including electrification control units |
| WO2011024658A1 (en) * | 2009-08-31 | 2011-03-03 | 村田機械株式会社 | Image forming apparatus and image forming method |
| US8755711B2 (en) | 2009-08-31 | 2014-06-17 | Murata Machinery, Ltd. | Image forming apparatus and image forming method |
| CN103135397A (en) * | 2011-11-28 | 2013-06-05 | 夏普株式会社 | Image forming apparatus and cleaning control method |
| US8744301B2 (en) | 2011-11-28 | 2014-06-03 | Sharp Kabushiki Kaisha | Image forming apparatus and cleaning control method |
| CN103135397B (en) * | 2011-11-28 | 2016-03-09 | 夏普株式会社 | Image forming apparatus and cleaning control method |
| JP2019061109A (en) * | 2017-09-27 | 2019-04-18 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP2020154034A (en) * | 2019-03-18 | 2020-09-24 | コニカミノルタ株式会社 | Image formation apparatus and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3461659B2 (en) | 2003-10-27 |
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