JP2822198B2 - Recording device - Google Patents
Recording deviceInfo
- Publication number
- JP2822198B2 JP2822198B2 JP1069986A JP6998689A JP2822198B2 JP 2822198 B2 JP2822198 B2 JP 2822198B2 JP 1069986 A JP1069986 A JP 1069986A JP 6998689 A JP6998689 A JP 6998689A JP 2822198 B2 JP2822198 B2 JP 2822198B2
- Authority
- JP
- Japan
- Prior art keywords
- developing roller
- photosensitive drum
- toner
- recording apparatus
- developing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】 （産業上の技術分野） 本発明は、現像ローラと感光体ドラムを接触して現像
を行うプリンタ，ファクシミリ，複写機等の記録装置に
関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device such as a printer, a facsimile, and a copying machine that performs development by contacting a developing roller and a photosensitive drum.
（従来の技術） 例えば、第２図に示すレーザープリンタの現像ローラ
７の表面と感光体ドラム８の表面はトナーを介して接触
している。感光体ドラムに接触したトナーは、（−）帯
電しているため、トナーは現像ローラより電位の低い感
光体ドラムの露光部から吸引力を受け、電位の高い非露
光部から反発力を受ける。そして、感光体ドラム露光部
が現像ローラに接触すると、感光体ドラムからの吸引力
が現像ローラとの付着力に打ち勝ち、トナーは感光体ド
ラム側に移動する。(Prior Art) For example, the surface of the developing roller 7 of the laser printer shown in FIG. 2 is in contact with the surface of the photosensitive drum 8 via toner. Since the toner in contact with the photoconductor drum is (-) charged, the toner receives a suction force from an exposed portion of the photoconductor drum having a lower potential than the developing roller, and receives a repulsive force from a non-exposed portion having a higher potential. Then, when the photosensitive drum exposure unit comes into contact with the developing roller, the suction force from the photosensitive drum overcomes the adhesive force with the developing roller, and the toner moves to the photosensitive drum side.
また、感光体ドラム非露光部が現像ローラに接触する
と、感光体ドラムからのトナーに対して、反発力が働く
ため、トナーは現像ローラ上に保持される。このように
して静電潜像がトナー像に変換される。When the non-exposed portion of the photosensitive drum contacts the developing roller, a repulsive force acts on the toner from the photosensitive drum, so that the toner is held on the developing roller. Thus, the electrostatic latent image is converted into a toner image.
一方、感光体ドラム表面に（−）帯電したトナーが付
着すると（＋）電荷がベースに誘起され、トナーは感光
体ドラム上に保持される。On the other hand, when (-) charged toner adheres to the surface of the photosensitive drum, (+) charge is induced on the base, and the toner is held on the photosensitive drum.
上記感光体ドラムと現像ローラの線速比は、感光体ド
ラムの線速に対して、現像ローラの線速が僅かに早く回
転するように設定し、トナー濃度を高くし、印字品質の
向上をはかっている。The linear speed ratio between the photosensitive drum and the developing roller is set so that the linear speed of the developing roller rotates slightly faster than the linear speed of the photosensitive drum, thereby increasing the toner density and improving the printing quality. I am wearing it.
（発明が解決しようとする課題） ところで、上記感光体ドラムに使用する素管は、一般
に金属（アルミニウム）が多く、硬い材質であり、一
方、現像ローラの材質はゴム系の物が多く軟い材質で形
成し、これにより感光体ドラムと現像ローラとのニップ
幅を広くし、感光体ドラムと現像ローラの回転時に接触
不良が生じないようにしている。(Problems to be Solved by the Invention) By the way, the raw tube used for the photoreceptor drum is generally made of a metal (aluminum) and made of a hard material, while the material of the developing roller is made of a rubber-based material and soft. The photosensitive drum and the developing roller are widened so that a contact failure does not occur when the photosensitive drum and the developing roller rotate.
しかし、記憶装置が非動作時は、常に感光体ドラムと
現像ローラが接触していて、軟い現像ローラの接触部が
歪んで凹部となることがある。この状態において、記録
装置が記録動作を開始すると、前記現像ローラの凹部が
黒スジ（縦方向黒帯）となって表われる。これは、記録
装置の非動作時間が長くなる程、凹部の影響が大きくな
るという不具合があった。しかし、その後、記録動作を
連続して行ない時間がたつと、軟いゴムで構成されてい
る現像ローラの凹部も、次第に回復し、所定ページ以
上、プリントを行うと黒スジは消滅してしまう。However, when the storage device is not operating, the photosensitive drum and the developing roller are always in contact, and the contact portion of the soft developing roller may be distorted to form a concave portion. In this state, when the recording apparatus starts the recording operation, the concave portion of the developing roller appears as a black stripe (vertical black band). This is disadvantageous in that the longer the non-operation time of the recording apparatus, the greater the effect of the recess. However, after a lapse of a continuous recording operation, the concave portion of the developing roller made of soft rubber gradually recovers, and when printing is performed for a predetermined number of pages or more, the black stripe disappears.
本発明は、上述した待機時から動作時に移った開始時
の現像ローラの凹部による黒スジの発生を無くし、プリ
ント開始時から良質な画像をうることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the occurrence of black stripes due to the concave portion of the developing roller at the start of the transition from the standby state to the operation time, and to obtain a high-quality image from the start of printing.
（構成および作用） 本発明は上記目的を達成するため、現像ローラまたは
感光体ドラムの少なくとも一方を軟性部材で構成し、前
記現像ローラと前記感光体ドラムを接触して現像を行う
記録装置において、待機時に、前記現像ローラおよび前
記感光体ドラムを所定時間間隔で所定時間だけ回転させ
る制御手段を有することを特徴とする。(Structure and Operation) In order to achieve the above object, the present invention provides a recording apparatus that forms at least one of a developing roller and a photosensitive drum with a flexible member, and performs development by contacting the developing roller and the photosensitive drum. A control means for rotating the developing roller and the photosensitive drum at predetermined time intervals for a predetermined time during standby is provided.
このように記録装置の非動作時に、現像ローラおよび
感光体ドラムを時々に回転させることにより、現像ロー
ラの凹部形成の機会をなくし、黒スジの発生を防止す
る。As described above, by occasionally rotating the developing roller and the photosensitive drum when the recording apparatus is not operating, the opportunity of forming the concave portion of the developing roller is eliminated, and the occurrence of black stripes is prevented.
（実施例） 現像ローラと感光体ドラムの回転制御は、現像ローラ
が歪の影響を発生する前までの時間間隔で現像ローラ位
置を僅かに移動すればよい。即ち、感光体ドラムとの接
触部が移動する距離、換言すれば時間制御方法として
は、現像ローラと感光体ドラムを所定時間間隔で所定時
間だけ回転させることが挙げられ、この場合、次の２つ
がある。(Embodiment) The rotation control of the developing roller and the photosensitive drum may be performed by slightly moving the position of the developing roller at a time interval before the developing roller exerts the influence of distortion. That is, as a method of controlling the distance by which the contact portion with the photosensitive drum moves, in other words, the time control method, the developing roller and the photosensitive drum are rotated for a predetermined time at predetermined time intervals. There is one.
（１）現像ローラと感光ドラムの接触部が、互いに離れ
るに必要な移動時間だけ回転させる。(1) The contact portion between the developing roller and the photosensitive drum is rotated for a moving time necessary for separating the contact portion from each other.
この方法は、現像ローラと感光体ドラムとのニップ部
に、トナーが少しあるため、感光体ドラム上にトナーが
少しずつ付着して行き、次の記録時にクリーニング不良
があると地汚れの可能性があるが、クリーナが充分に能
力があれば、何等支障がない。In this method, since a small amount of toner is present in the nip between the developing roller and the photosensitive drum, the toner gradually adheres to the photosensitive drum, and if there is a cleaning failure during the next recording, there is a possibility of background contamination. There is no problem if the cleaner has enough capacity.
（２）現像ローラと感光体ドラムとの接触部が、クリー
ニングされるまで、感光体ドラムを回転し移動させる。(2) The photosensitive drum is rotated and moved until the contact portion between the developing roller and the photosensitive drum is cleaned.
この方法は（１）に比べ問題はないが、感光体ドラム
が回転する時間が長くなるので、記録装置の非動作時に
駆動系が動作する結果、音を発生する。Although this method has no problem as compared with the method (1), since the rotation time of the photosensitive drum becomes longer, a sound is generated as a result of the drive system operating when the recording apparatus is not operating.
第１図は上記、現像ローラと感光体ドラムの回転制御
を行なうための一実施例の機能ブロック図を示す。図に
おいて、１は記録装置の制御部、２は第２図に示す現像
ローラ７の駆動用モータ、３は同じく感光体ドラム８の
駆動用モータ、４はその他の制御部へ出力、５および６
は夫々現像ローラに対する現像バイアス出力、現像逆バ
イアス出力を示す。FIG. 1 is a functional block diagram of an embodiment for controlling the rotation of the developing roller and the photosensitive drum. In the drawing, 1 is a control unit of the recording apparatus, 2 is a driving motor of the developing roller 7 shown in FIG. 2, 3 is a driving motor of the photosensitive drum 8 similarly, and 4 is an output to other control units.
Indicates a developing bias output and a developing reverse bias output to the developing roller, respectively.
これを動作させるには、前記した時間制御方法によっ
て制御部１から記録装置の待機時、即ち非動作時に現像
駆動用モータ２、感光体ドラム駆動用モータ３に起動信
号S1,S2を送り、これを回転させる。ところで、あるプ
ロセスのプリント時、画像域の現像ローラにはバイアス
〔（＋）または（−）〕を現像バイアス出力５から印加
し、非画像域には前記画像域と逆バイアス〔（−）また
は（＋）〕を現像逆バイアス出力６から印加する方式が
あるが、上記、モータ２及び３を所定時間間隔で回転す
る時も、上記バイアス印加の方式が実施され、逆バイア
スにより感光体ドラム上にトナーが付かなくなり、地汚
れをなくすることができる。To operate this, the start signals S 1 and S 2 are sent from the control unit 1 to the developing drive motor 2 and the photosensitive drum drive motor 3 from the control unit 1 according to the time control method described above when the recording apparatus is on standby, that is, when it is not operating. , Rotate this. By the way, at the time of printing in a certain process, a bias [(+) or (−)] is applied to the developing roller in the image area from the developing bias output 5, and a reverse bias [(−) or (+)] Is applied from the development reverse bias output 6, but when the motors 2 and 3 are rotated at predetermined time intervals, the above-described bias application method is also implemented, and the reverse bias is applied to the photosensitive drum. No toner adheres to the surface, and background contamination can be eliminated.
また、トナー濃度を高くし印字品質の向上をはかるた
め、上記モータ2,3を所定時間間隔で回転する時も、モ
ータ２（現像ローラ）の線速がモータ３（感光体ドラ
ム）の線速より僅かに速く回転制御することによりトナ
ー濃度が均一となり、印字品質が良くなる。Also, in order to increase the toner density and improve the print quality, when the motors 2 and 3 are rotated at predetermined time intervals, the linear speed of the motor 2 (developing roller) is maintained at the linear speed of the motor 3 (photosensitive drum). By controlling the rotation slightly faster, the toner concentration becomes uniform, and the printing quality is improved.
また、記録装置で現像器の下流にクリーニングユニッ
ト９をもつ構成では、感光体ドラムの移動量を、現像ロ
ーラの接触部からクリーニングユニット９を通過する以
上、回転させることにより、常に感光体ドラム上でのト
ナーの付着をなくし地汚れを防止する。Further, in the configuration in which the recording apparatus has the cleaning unit 9 downstream of the developing device, the moving amount of the photosensitive drum is rotated as long as the moving amount of the photosensitive drum passes through the cleaning unit 9 from the contact portion of the developing roller. To prevent the toner from adhering, thereby preventing background contamination.
なお、図例では現像ローラ７と感光体ドラム８との駆
動用モータ2,3を夫々別個に設けている場合を示した
が、共用し１個でもよい。この場合は、現像ローラと感
光体ドラムは同時に回転制御され、これはコスト的に有
利である。In the illustrated example, the drive motors 2 and 3 for the developing roller 7 and the photosensitive drum 8 are separately provided. However, one drive motor may be used in common. In this case, the rotation of the developing roller and the photosensitive drum is simultaneously controlled, which is advantageous in cost.
また、本発明は現像ローラと感光体ドラムの場合につ
いてのべたが、現像ローラ７においては、第２図に示す
ようにドクタローラ10、トナーを補給するローラ11、現
像ローラからトナーを落すクリーニングローラが互いに
接触しており、これらローラによって現像ローラに凹み
を発生する場合もある。このようなときは、前記方法で
凹みを解消することも可能である。In the present invention, the developing roller and the photosensitive drum are described. In the developing roller 7, as shown in FIG. 2, a doctor roller 10, a roller 11 for supplying toner, and a cleaning roller for dropping toner from the developing roller are provided. These rollers are in contact with each other, and these rollers may cause a depression in the developing roller. In such a case, the dent can be eliminated by the above method.
また、上記実施例では、感光体ドラムと現像ローラに
所定の圧力を加えて現像を行う方式において、現像ロー
ラが感光体ドラムに比べ軟かい材料を用いた場合につい
てのべたが、この逆の場合、または、両方とも軟い場
合、凹部が生じ黒スジ発生の原因となるときも、本回転
制御法を実施し回避することができる。Further, in the above embodiment, in the method of performing development by applying a predetermined pressure to the photosensitive drum and the developing roller, the case where the developing roller is made of a material softer than the photosensitive drum has been described. Alternatively, when both are soft, the present rotation control method can be implemented and avoided even when a concave portion occurs and black stripes are generated.
（発明の効果） 以上説明したように、本発明は記録装置の待機時に、
現像ローラおよび感光体ドラムを所定時間間隔で所定時
間だけ回転する簡単な手段でもって、両者の接触部にお
ける軟い材質でできた一方の凹み発生をなくし、記録装
置の動作時における黒スジ発生を防ぎ最初のプリントか
ら良質な印字品質をうることができる。しかも、両者間
に介在するトナーにより軟らかい材質からなる方を削っ
てしまうという不具合を防止できる。(Effects of the Invention) As described above, the present invention provides a method for
By a simple means of rotating the developing roller and the photosensitive drum at predetermined time intervals for a predetermined time, the occurrence of one dent made of a soft material at the contact portion between the two is eliminated, and the occurrence of black stripes during the operation of the recording apparatus is reduced. Good print quality can be obtained from the first print. In addition, it is possible to prevent a problem that the softer material is shaved by the toner interposed therebetween.
第１図は本発明方法を実施するための制御回路の機能ブ
ロック図、第２図は本発明が実施されるレーザープリン
タの縦断面図である。 １……制御部、２……現像駆動用モータ、３……感光体
ドラム駆動用モータ、４……その他の制御部への出力、
５……現像バイアス出力、６……現像逆バイアス出力、
７……現像ローラ、８……感光体ドラム。FIG. 1 is a functional block diagram of a control circuit for carrying out the method of the present invention, and FIG. 2 is a longitudinal sectional view of a laser printer in which the present invention is implemented. 1 ... Control unit, 2 ... Developing drive motor, 3 ... Photoconductor drum drive motor, 4 ... Output to other control units,
5: development bias output, 6: development reverse bias output,
7: developing roller, 8: photosensitive drum.
Claims (1)
も一方を軟性部材で構成し、前記現像ローラと前記感光
体ドラムを接触して現像を行う記録装置において、待機
時に、前記現像ローラおよび前記感光体ドラムを所定時
間間隔で所定時間だけ回転させる制御手段を有すること
を特徴とする記録装置。1. A recording apparatus in which at least one of a developing roller and a photosensitive drum is formed of a flexible member and performs development by contacting the developing roller and the photosensitive drum, the developing roller and the photosensitive drum are in standby mode. A recording apparatus comprising a control means for rotating a drum at predetermined time intervals for a predetermined time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1069986A JP2822198B2 (en) | 1989-03-22 | 1989-03-22 | Recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1069986A JP2822198B2 (en) | 1989-03-22 | 1989-03-22 | Recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02248967A JPH02248967A (en) | 1990-10-04 |
| JP2822198B2 true JP2822198B2 (en) | 1998-11-11 |
Family
ID=13418503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1069986A Expired - Lifetime JP2822198B2 (en) | 1989-03-22 | 1989-03-22 | Recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2822198B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5799228A (en) * | 1995-06-09 | 1998-08-25 | Ricoh Company, Ltd. | Image forming apparatus which prevents adverse affects from heating elements |
| JP5541071B2 (en) | 2010-10-15 | 2014-07-09 | コニカミノルタ株式会社 | Image forming apparatus |
| JP6308426B2 (en) * | 2014-03-18 | 2018-04-11 | 株式会社リコー | Image forming apparatus and image forming apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151684A (en) * | 1984-01-19 | 1985-08-09 | Olympus Optical Co Ltd | Electrophotographic copying machine |
| JPS6246457U (en) * | 1985-09-09 | 1987-03-20 | ||
| JPH0641256Y2 (en) * | 1985-12-24 | 1994-10-26 | キヤノン株式会社 | Development device |
-
1989
- 1989-03-22 JP JP1069986A patent/JP2822198B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02248967A (en) | 1990-10-04 |
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