JPH0415670A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH0415670A JPH0415670A JP2118546A JP11854690A JPH0415670A JP H0415670 A JPH0415670 A JP H0415670A JP 2118546 A JP2118546 A JP 2118546A JP 11854690 A JP11854690 A JP 11854690A JP H0415670 A JPH0415670 A JP H0415670A
- Authority
- JP
- Japan
- Prior art keywords
- image
- speed
- electrifying
- reduced
- mode
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 abstract description 14
- 238000004040 coloring Methods 0.000 abstract 2
- 108091008695 photoreceptors Proteins 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 206010047571 Visual impairment Diseases 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
この発明は、原稿の画像を像担持体に形成する速度を切
り換えできる画像形成装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Application Field) The present invention relates to an image forming apparatus that can change the speed at which an image of a document is formed on an image carrier.
（従来の技術）
画像形成装置として複写機、特に静電式讐通紙複写機は
多くの分野で日常的に使用されている。(Prior Art) Copying machines, especially electrostatic paper copying machines, are routinely used in many fields as image forming apparatuses.
使用目的も様々であるが複写機に要求される性能は、高
品位の画像が求められる一方で、高速度の複写が要求さ
れ、ｔ７’、、：他方では着色粉末（トナー）の消費量
を抑えた経済的な複写が要求されている。The purpose of use varies, but the performance required of a copying machine is that on the one hand, high-quality images are required, and on the other hand, high-speed copying is required, and on the other hand, the consumption of colored powder (toner) is Low cost and economical copying is required.
（発明が解決しようとする課題）
しかし、従来の複写機ではこれらの高品位画像、高速複
写、又は経済性のそれぞれの要求に満足するのは極めて
難しく、改善が望まれていた。(Problems to be Solved by the Invention) However, it is extremely difficult for conventional copying machines to satisfy the requirements for high-quality images, high-speed copying, and economy, and improvements have been desired.
そこてこの発明は、高品位の画像か得られるとともに、
高速かつ経済的な画像形成を可能とすることを目的とし
ている。Therefore, this invention not only allows high-quality images to be obtained, but also
The purpose is to enable high-speed and economical image formation.
し発明の構成］
（課題を解決するための手段〉
前記課題を解決するためにこの発明は、原稿の画像を帯
電され、移動する像担持体に形成する画像形成装置にお
いて、前記像担持体に電位を付与する帯電手段と、前記
像担持体の移動速度を少なくとも２つ以上の速度で切換
える速度切換手段と、この速度切換手段が高速側に切り
換えられたとき低速側のときより前記帯電手段の出力値
を小さくする制御手段とを共備オる機成としたものであ
る。[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides an image forming apparatus that forms an image of a document on a charged and moving image bearing member. a charging means for applying an electric potential; a speed switching means for switching the moving speed of the image carrier between at least two speeds; This mechanism is also equipped with a control means for reducing the output value.
（作用）
速度切換手段により像担持体の移動速度か高速側に切り
換えられると、制御手段は帯電手段の出力値を小さくし
て像担持体の帯電電位を低下させる。これにより、像担
持体に付着する着色粉末の量は減少する。一方、像担持
体の移動速度を低速側に切り換えると、像担持体の帯電
電位は高速時より高くなって像担持体に付着する着色粉
末の量が増加し、高品位の画像か得られる。(Function) When the moving speed of the image carrier is switched to a high speed side by the speed switching device, the control device reduces the output value of the charging device to lower the charging potential of the image carrier. This reduces the amount of colored powder adhering to the image carrier. On the other hand, when the moving speed of the image bearing member is switched to the low speed side, the charging potential of the image bearing member becomes higher than that when the moving speed is high, and the amount of colored powder adhering to the image bearing member increases, so that a high quality image can be obtained.
〈実施例） 以下、この発明の実施例を図に基づいて説明する。<Example) Embodiments of the present invention will be described below with reference to the drawings.
第１図はこの発明に使用される画像形成装置としての複
写機の構成フロック図であり、第２図は同複写機の断面
図である。複写機本体１の上面にはプラテンカラス３か
設けてあり、原稿りは用紙Ｐに画像を形成する際、複写
機本体１に開閉自在に設けられたプラテンカバー５によ
りプラテンシ）−７を介してプラテンカラス３へ密接さ
れる。FIG. 1 is a structural block diagram of a copying machine as an image forming apparatus used in the present invention, and FIG. 2 is a sectional view of the copying machine. A platen crow 3 is provided on the upper surface of the copying machine main body 1, and when forming an image on paper P, the document is transferred via a platen crow 3 by a platen cover 5 provided on the copying machine main body 1 so as to be openable and closable. It is closely approached by the platen crow 3.
用紙Ｐは、複写機本体１内下部に収納された用紙トレイ
９，１１に積重ねられ、取出しローラ１３と分離搬送装
置１４とによって画像形成部１５の下部に供給され、画
像形成を終えた用紙Ｐは排紙トレイ１７に排出される。Paper P is stacked on paper trays 9 and 11 housed in the lower part of the copying machine main body 1, and is supplied to the lower part of the image forming section 15 by the take-out roller 13 and the separation conveyance device 14, and the paper P on which the image has been formed is is discharged onto the paper discharge tray 17.
画像形成部１５は、複写機本体１内のほぼ中央部に回転
可能に軸支された像担持体としての感光体２コ、この感
光体２１を帯電する帯電手段２３、露光ランプ２５によ
り照射された原稿画像を、後述する走査ａ！槽２７によ
って感光体２］の露光部２９に投影し、いわゆる静電潜
像を形成する露光装置３１、感光体２１の静電潜像に着
色粉末を付着させて可視像を形成する現像装置３３、ア
ライニングローラ１９によって送り込まれて感光体２１
に密着した用紙Ｐに感光体２１上の反転像を転写する転
写装置３５、用紙Ｐを感光体２１から剥離する剥離装置
３７、感光体２１に残った着色粉末をかき落す清掃装置
３つ、感光体２１上の残像を除去する除電装置４１、お
よび前記剥離された用紙Ｐ上の着色粉末を加熱雷名さぜ
る定着装置４３なとによって構成されている。The image forming section 15 includes two photoreceptors as image carriers that are rotatably supported in the center of the copying machine main body 1, a charging means 23 that charges the photoreceptors 21, and an exposure lamp 25. The scanned original image is scanned a! An exposure device 31 that projects onto the exposure section 29 of the photoconductor 2 through a tank 27 to form a so-called electrostatic latent image, and a developing device that attaches colored powder to the electrostatic latent image on the photoconductor 21 to form a visible image. 33, the photoreceptor 21 is fed by the aligning roller 19
a transfer device 35 that transfers the inverted image on the photoconductor 21 to the paper P that is in close contact with the photoconductor, a peeling device 37 that detaches the paper P from the photoconductor 21, three cleaning devices that scrape off colored powder remaining on the photoconductor 21, and a photoconductor. The fixing device 43 includes a static eliminator 41 that removes an afterimage on the sheet 21, and a fixing device 43 that heats and heats the colored powder on the peeled paper P.
走査ｍ楕２７は、露光ランプ２５の背部を囲むリフレク
タ４５、原稿りからの反射光を露光部２つへ順次導くた
めの第］のミラー４７を搭載してプラテンカラス３の下
面に沿い往復移動自在な第１のキャリッジ４つと、第１
のミラー４７の像を順次導くための第２のミラー５１．
第３のミラー５３を搭載して前記第１のキャリッジ４つ
の半分の速度て同方向に移動する第２のキャリッジ５５
とからなり、第３のミラー５３から送られた反射光はレ
ンス５７、第４のミラー５つ、第５のミラー６１、第６
のミラー６３によって露光部２９へ順次送られ、キャリ
ッジ４９．５５が第２図の左から右へ走行することによ
りプラテンガラス３にセットされた原稿りを走査して感
光体２１に原稿画像を露光する。The scanning m-ellipse 27 is equipped with a reflector 45 surrounding the back of the exposure lamp 25 and a second mirror 47 for sequentially guiding the reflected light from the document tray to the two exposure sections, and moves back and forth along the lower surface of the platen crow 3. 4 free first carriages and 1st
A second mirror 51 .
A second carriage 55 carrying a third mirror 53 and moving in the same direction at half the speed of the four first carriages.
The reflected light sent from the third mirror 53 is transmitted through a lens 57, five fourth mirrors, a fifth mirror 61, and a sixth mirror.
The carriage 49.55 moves from left to right in FIG. 2 to scan the original set on the platen glass 3 and expose the original image onto the photoreceptor 21. do.
現像装置３３の現像ローラ６５および複写機本体１内の
冷却を行う冷却ファン６７は、メインモタ６つによって
一定速度で駆動され、電源投入中は冷却ファン６７は常
に回転するが、コピーキ７１が押されるときは図示外の
クラッチか動作して現像ローラ６５が回転するように駆
動系制御部７３は制御動作を行う。The cooling fan 67 that cools the developing roller 65 of the developing device 33 and the inside of the copying machine body 1 is driven at a constant speed by six main motors, and the cooling fan 67 always rotates while the power is turned on, but when the copy key 71 is pressed. At this time, the drive system control section 73 performs a control operation so that a clutch not shown in the drawings operates to rotate the developing roller 65.
原稿画像を静電潜像として形成する感光体２］と、感光
体２１上の静電潜像に着色粉末か付着して形成された可
視像を転写された用紙Ｐｌ−の着色粉末を定着させる定
着装置４３の定着ローラ７７は、サブメインモータ７９
によって駆動される。The colored powder is fixed on the photoreceptor 2 which forms the original image as an electrostatic latent image, and on the paper Pl- to which the visible image formed by adhering colored powder to the electrostatic latent image on the photoreceptor 21 has been transferred. The fixing roller 77 of the fixing device 43 is driven by a sub-main motor 79.
driven by.
用紙トレイ９上の用紙Ｐを取り出す取出しローラ１３、
取り出した用紙Ｐを１枚つつ分離し２搬送する分離搬送
装置１４．および分離搬送された用紙Ｐを正しい姿勢に
整えて転写装置３５に供給するアライニングローラ１９
は、給紙モータ８０によって駆動される。転写装置３５
によって感光体２１上の像を転写された用紙Ｐを感光体
２１から剥離する剥離装置３７から定着装置４３まで用
紙Ｐを搬送する搬送ベルト４２と、搬送ベルト４２の後
方の定着装置４３を出た用紙Ｐを排紙トレイ１７に排出
する排紙口〜う４４は、搬送モータ８２によって駆動さ
れる。a take-out roller 13 that takes out the paper P on the paper tray 9;
Separation and conveyance device 14 that separates the taken out paper P one by one and conveys it two times. and an aligning roller 19 that arranges the separated and conveyed paper P in the correct posture and supplies it to the transfer device 35.
is driven by a paper feed motor 80. Transfer device 35
A conveyor belt 42 conveys the paper P from a peeling device 37 that peels off the image on the photoreceptor 21 from the photoreceptor 21 to a fixing device 43, and a conveyor belt 42 that conveys the paper P to which the image on the photoreceptor 21 has been transferred is removed from the fixing device 43 behind the conveyor belt 42. A paper discharge port 44 for discharging the paper P to the paper discharge tray 17 is driven by a transport motor 82 .
上記サブメインモータ７９．給紙モータ８０および搬送
モータ８２は、何れも高速モードと低速モードの２つの
速度に切換え可能であり、複写機本体１の図示省略した
コントロールパネルに設けである速度切換手段としての
モード切換スイ・ノチ８１を切換えると、本体制御部８
３は駆動系制御部７３を介してサブメインモータ７９．
給紙モタ８０および搬送モータ８２に前記高速又は低速
回転を指令すると共に、制御手段としての帯電電位制御
部８５を介して帯電手段２３に含まれる帯電トランス８
７に低圧又は高圧それぞれの制御電圧を指令する。サブ
メインモータ７９．給紙モタ８０および搬送モータ８２
が高速に切り換えられたときには、帯電トランス８７は
感光体２１に付与する帯電電圧を低くし、一方すブメイ
ンモタ７９．給紙モータ８０および搬送モータ８２が低
速に切り換えられたときには、帯電トランス８７は感光
体２１に付与する帯電電圧を高くする。The above sub-main motor 79. Both the paper feed motor 80 and the conveyance motor 82 can be switched between two speeds, a high speed mode and a low speed mode, and a mode switching switch serving as a speed switching means is provided on a control panel (not shown) of the copying machine main body 1. When the notch 81 is switched, the main body control section 8
3 is a sub-main motor 79.3 via a drive system control section 73.
The charging transformer 8 included in the charging means 23 is commanded to the paper feed motor 80 and the transport motor 82 to rotate at high speed or low speed, and the charging transformer 8 included in the charging means 23 is controlled via the charging potential control section 85 as a control means.
7 to command each control voltage of low voltage or high voltage. Sub-main motor 79. Paper feed motor 80 and conveyance motor 82
is switched to a high speed, the charging transformer 87 lowers the charging voltage applied to the photoreceptor 21, while the main motor 79. When the paper feed motor 80 and the transport motor 82 are switched to low speed, the charging transformer 87 increases the charging voltage applied to the photoreceptor 21.
このように構成された複写機においては、モード切換ス
イッチ８１を低速モードに設定すると、感光体２１の回
転速度および用紙Ｐの移動速度は１２５−糟７／秒てあ
り、１分角たりの複写枚数は２２枚となる。一方、この
とき感光体２］−を帯電させるための帯電トランス８７
の制御電圧は比較的高い８００■となって、感光体２１
に付着する着色粉末の景か多くなり、高濃度１高品位の
画像形成が行われる。In the copying machine configured as described above, when the mode selector switch 81 is set to the low speed mode, the rotational speed of the photoreceptor 21 and the moving speed of the paper P are 125 - 7/sec, and copies are made per minute. The number of sheets will be 22. On the other hand, at this time, a charging transformer 87 for charging the photoreceptor 2
The control voltage is relatively high 800μ, and the photoreceptor 21
The amount of colored powder adhering to the image increases, and high-density, high-quality images are formed.
これに対しモード切換スイッチ８１を高速モトに切換え
ると、感光体２１の回転速度および用紙Ｐの移動速度は
低速モード時より高くなって１６６ ｍ ／秒となり、
１分角たりの複写枚数も３０枚に増加する。このときの
帯電トランス８７０制御電圧は低速モード時より低下し
て５６０ｖとなる。高速モードでの感光体２１の帯電電
位は一低速モードに比へて回転速度の上昇に反比例して
低下するが、さらに帯電トランス８７の制御電圧が低下
しているので、この降下した電圧分だけさらに感光体２
］の帯電電位は低くなって着色粉末の付着量は低速モー
ドのときより大幅に減少し、経済的な画像形成が行われ
ることになる。On the other hand, when the mode selector switch 81 is switched to high-speed mode, the rotational speed of the photoreceptor 21 and the moving speed of the paper P become 166 m/sec, which is higher than in the low-speed mode.
The number of copies per minute also increases to 30. The charging transformer 870 control voltage at this time is 560V, which is lower than in the low speed mode. The charging potential of the photoreceptor 21 in the high-speed mode decreases in inverse proportion to the increase in rotational speed compared to the low-speed mode, but since the control voltage of the charging transformer 87 has further decreased, the potential of the photoreceptor 21 decreases by the amount of this decreased voltage. Furthermore, photoreceptor 2
] The charging potential becomes lower and the amount of colored powder deposited is significantly reduced compared to the low speed mode, resulting in economical image formation.
したがって、低速モードを選択するときは、複写速度は
低いが感光体２１の帯電電位は高くなって高濃度で高品
位の画像が形成されることになり、これに対して高速モ
ードを選択すれば複写速度が高く、着色粉末の消費量が
少ない経済的な画像形成が可能となり、使用者の要望に
応した適宜な複写動作が１台の複写機によって自在に得
られることになる。Therefore, when the low-speed mode is selected, the copying speed is low, but the charged potential of the photoreceptor 21 is high, and a high-density, high-quality image is formed.On the other hand, when the high-speed mode is selected, It becomes possible to form images economically with high copying speed and low consumption of colored powder, and it is possible to freely perform appropriate copying operations according to the user's needs with a single copying machine.
なお、駆動系制御部７３によって前述のように制御され
るメインモータ６９．サブメインモ〜り７９、給紙モー
タ８０および搬送モータ８２と、これら各モータによっ
てそれぞれ駆動される前記各装置の駆動系の具体例は、
前記第１図に示した構成に限るものではない。Note that the main motor 69. which is controlled by the drive system control section 73 as described above. A specific example of the sub-main motor 79, paper feed motor 80, conveyance motor 82, and the drive system of each of the above-mentioned devices each driven by each of these motors is as follows:
The configuration is not limited to that shown in FIG. 1 above.
［発明の効果］
以上のようにこの発明によれば、像担持体の移動速度を
高速側に切り換えた場合に、帯電手段の像担持体への出
力値を低下させるよう構成したので、高速時には像担持
体の帯電電位が小さくなって着色粉末の消費量の少ない
経済的な画像形成が行われ、一方像担持体の移動速度を
低速側に切り換えた場合には、像担持体の帯電電位が高
速時より大きくなって高濃度、高品位の画像が得られ、
この結果使用者の選択によって高速で経済的な画像形成
と、高濃度、高品位な画像形成とを適宜行うことがてき
る。[Effects of the Invention] As described above, according to the present invention, when the moving speed of the image carrier is switched to the high speed side, the output value of the charging means to the image carrier is reduced. The charged potential of the image carrier becomes smaller, resulting in economical image formation with less consumption of colored powder.On the other hand, when the moving speed of the image carrier is switched to the low speed side, the charged potential of the image carrier decreases. It is larger than at high speeds, allowing you to obtain high-density, high-quality images.
As a result, high-speed, economical image formation and high-density, high-quality image formation can be performed as appropriate, depending on the user's selection.
第１図はこの発明の一実施例の複写機の構成フロック図
、第２図は同複写機の断面図である。
２１・・感光体く像担持体）
８１・・モート切換スイ・ノチ（速度切換手段）８５・
・帯電電位制御部（制御手段）
８７・・帯電トランス（帯電手段）
Ｄ・・・原稿 Ｐ・用紙FIG. 1 is a structural block diagram of a copying machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same copying machine. 21...Photoreceptor, image carrier) 81...Mote switching switch (speed switching means) 85.
-Charging potential control unit (control means) 87...Charging transformer (charging means) D...Document P/Paper
Claims (1)
画像形成装置において、前記像担持体に電位を付与する
帯電手段と、前記像担持体の移動速度を少なくとも２つ
以上の速度で切換える速度切換手段と、この速度切換手
段が高速側に切り換えられたとき低速側のときより前記
帯電手段の出力値を小さくする制御手段とを具備するこ
とを特徴とする画像形成装置。In an image forming apparatus that forms an image of a document on a charged and moving image carrier, a charging unit applies a potential to the image carrier, and a speed that switches the moving speed of the image carrier between at least two speeds. An image forming apparatus comprising: a switching means; and a control means for making the output value of the charging means smaller when the speed switching means is switched to a higher speed side than when the charging means is switched to a lower speed side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2118546A JPH0415670A (en) | 1990-05-10 | 1990-05-10 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2118546A JPH0415670A (en) | 1990-05-10 | 1990-05-10 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415670A true JPH0415670A (en) | 1992-01-21 |
Family
ID=14739266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2118546A Pending JPH0415670A (en) | 1990-05-10 | 1990-05-10 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415670A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6567632B2 (en) * | 2000-12-21 | 2003-05-20 | Hitachi, Ltd. | Electrophotographic device |
| JP2006259031A (en) * | 2005-03-16 | 2006-09-28 | Ricoh Co Ltd | Process cartridge, image forming apparatus, and image forming method |
-
1990
- 1990-05-10 JP JP2118546A patent/JPH0415670A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6567632B2 (en) * | 2000-12-21 | 2003-05-20 | Hitachi, Ltd. | Electrophotographic device |
| JP2006259031A (en) * | 2005-03-16 | 2006-09-28 | Ricoh Co Ltd | Process cartridge, image forming apparatus, and image forming method |
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