JPH03186876A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH03186876A JPH03186876A JP32490389A JP32490389A JPH03186876A JP H03186876 A JPH03186876 A JP H03186876A JP 32490389 A JP32490389 A JP 32490389A JP 32490389 A JP32490389 A JP 32490389A JP H03186876 A JPH03186876 A JP H03186876A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- polarity
- transfer belt
- belt
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007786 electrostatic charging Methods 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 17
- 238000000034 method Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
（１）発明の目的
（産業上の利用分野）
この発明は、静電複写機、同プリンタなど静電転写プロ
セスを利用する画像形成装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention (Field of Industrial Application) The present invention relates to an image forming apparatus using an electrostatic transfer process, such as an electrostatic copying machine and a printer thereof.
（従来技術と解決すべき課題）
上記のような画像形成装置において、回転円筒状の像担
持体（感光体という）に転写ベルトを当接し、両者が当
接する転写部位に紙などの転写材を供給して、感光体表
面に形成したトナー像を転写材に転移させるように構成
した画像形成装置が従来から周知である。(Prior Art and Problems to be Solved) In the image forming apparatus as described above, a transfer belt is brought into contact with a rotating cylindrical image bearing member (referred to as a photoreceptor), and a transfer material such as paper is placed in the transfer area where both come into contact. Image forming apparatuses configured to supply toner and transfer a toner image formed on the surface of a photoreceptor to a transfer material are conventionally well known.
第５図はこのような画像形成装置の構成を示す概略側面
図であって、矢印Ｘ方向に回転走行する感光体３の表面
が、−成帯電器４によって一様に帯電され、該帯電面に
画像変調されたレーザビームなどの画像信号５が投射さ
れて、その部分の電位が減衰して静電潜像が形成される
。FIG. 5 is a schematic side view showing the configuration of such an image forming apparatus, in which the surface of the photoreceptor 3 rotating and traveling in the direction of the arrow X is uniformly charged by the charger 4, and the charged surface An image signal 5 such as an image-modulated laser beam is projected onto the area, and the potential at that area is attenuated to form an electrostatic latent image.
感光体３の走行にともなって該潜像が、感光体３と現像
器６とが対向する現像部位に至ると、前記潜像にトナー
が供給されてトナー像が形成されて、このトナー像が、
感光体３と転写ベルトｌが対向する転写部位Ａに到達す
る。As the photoreceptor 3 travels, when the latent image reaches a development area where the photoreceptor 3 and the developing device 6 face each other, toner is supplied to the latent image to form a toner image. ,
The photoreceptor 3 and the transfer belt 1 reach a transfer site A where they face each other.
転写ベルト１は図示のように、支持ローラ８．９．１０
に支持されており、不図示の適宜の駆動源によって矢印
方向に走行し、図示右方から供給された転写材Ｐは、転
写ベルト１に吸ｔＪ １ｌｌｔ）送されて、前記トナー
像とタイミングを合わせて転写部位Ａに至り、これとと
もに、転写部位において、転写ベルト１からみて、感光
体と反対側に配設された可撓性の電極２に、電源１１に
よって印加される転写バイアスの作用で前記トナー像は
転写材Ｐに転移する。The transfer belt 1 is connected to support rollers 8.9.10 as shown in the figure.
The transfer material P is supported by an appropriate driving source (not shown) in the direction of the arrow, and is supplied from the right side in the drawing. At the same time, the transfer voltage reaches the transfer site A, and at the same time, at the transfer site, due to the action of the transfer bias applied by the power source 11 to the flexible electrode 2 disposed on the opposite side of the photoreceptor when viewed from the transfer belt 1. The toner image is transferred to the transfer material P.
転写後、転写材は感光体から分離されて、さらに転写ベ
ルトｌによって搬送され、該ベルトからも分離されて定
着装置１２に供給される。After the transfer, the transfer material is separated from the photoreceptor and further conveyed by the transfer belt l, separated from the belt and supplied to the fixing device 12.
一方、転写部位において、転写材Ｐに転移しなかった一
部のトナーは、感光体３の回転にともなってクリーナ７
の位置にいたって感光体から除去され、感光体は次の画
像形成工程に入り得る状態となる。On the other hand, at the transfer site, some toner that has not been transferred to the transfer material P is removed by the cleaner 7 as the photoreceptor 3 rotates.
The photoreceptor is removed from the photoreceptor at the position , and the photoreceptor is ready for the next image forming process.
通常転写ベルトとしては、転写材のベルトへの吸着力（
体積抵抗値は大きい方がよい）と、ベルトのチャージア
ップによるトナーの飛び散り防止（体積抵抗値が小さい
方が有利である）の観点から、体積抵抗値が１０１０Ω
ｃｍ、厚みが２００μｍ程度の誘電体材料で構成するの
がよい。As a normal transfer belt, the adsorption power of the transfer material to the belt (
The volume resistance value is 1010 Ω from the viewpoint of preventing toner from scattering due to belt charge-up (a smaller volume resistance value is more advantageous).
It is preferable to use a dielectric material with a thickness of about 200 μm.
ところが、このような装置においては、ベタ黒画像部に
おける転写抜け、線状画像の細りなどの画質の劣化の発
生を阻止することが困難であった。However, in such an apparatus, it is difficult to prevent image quality deterioration such as transfer omission in solid black image areas and thinning of linear images.
このような現象は、転写時に転写材に付与される電荷が
不足することが原因であり、転写ベルトの抵抗値を変え
たり、転写バイアスを変化するだけではさしたる改善は
見られず、前述のような構成の場合、ベルトｌを支持す
る支持ローラへの、転写電流のリークによるのが主たる
原因であることが判明した。This phenomenon is caused by a lack of charge applied to the transfer material during transfer, and simply changing the resistance value of the transfer belt or the transfer bias will not bring much improvement; In the case of this configuration, it was found that the main cause was leakage of transfer current to the support roller that supports the belt l.
本発明はこのような事態に対処すべくなされたものであ
って、支持ローラに展張された転写ベルトをそなえた画
像形成装置において、転写時に、該転写ベルトを支持す
るローラを所定電位に維持するように構成して、転写電
流のリークを阻止して良好な転写を行ない得るような画
像形成装置を提供することを目的とするものである。The present invention has been made in order to cope with such a situation, and in an image forming apparatus equipped with a transfer belt stretched around a support roller, the roller supporting the transfer belt is maintained at a predetermined potential during transfer. It is an object of the present invention to provide an image forming apparatus configured as described above, which can prevent leakage of transfer current and perform good transfer.
（２）発明の構成
（課題を解決する技術手段、その作用）上記の目的を達
成するため、本発明は、像担持体に転写ベルトを当接さ
せ、両者の当接部として形成される転写部位に転写材を
挿通するとともに、転写ベルト側に転写バイアスを印加
して転写を行なうような画像形成装置において、転写ベ
ルトを支持する支持ローラの電位を、所定極性で所定の
値に維持する手段をそなえてなることを特徴とするもの
である。(2) Structure of the invention (technical means for solving the problem and its operation) In order to achieve the above object, the present invention provides a transfer belt that is brought into contact with an image carrier, and a transfer belt that is formed as a contact portion between the two. In an image forming apparatus that inserts a transfer material into a region and performs transfer by applying a transfer bias to the transfer belt side, means for maintaining the potential of a support roller that supports the transfer belt at a predetermined value with a predetermined polarity. It is characterized by having the following.
このように構成することによって、転写電流の転写ベル
トを介してのリークを阻止し、常時安定して良好な転写
性を得ることができる。With this configuration, leakage of transfer current through the transfer belt can be prevented, and stable and good transfer performance can be obtained at all times.
（実施例の説明）
第１図は本発明の実施例を示すもので、その基本的な構
成は、前述の第５図々示のものと同様で、対応する部分
には同一の符号を付して示してあり、それらについての
説明は省略する（後述の実施例についても同様）。(Description of Embodiment) Fig. 1 shows an embodiment of the present invention, the basic configuration of which is the same as that shown in Fig. 5 above, and corresponding parts are given the same reference numerals. The explanation thereof will be omitted (the same applies to the embodiments described later).
図示の装置においては、転写ベルト１を装架する支持ロ
ーラ８．９および１０を電源１３に接続して、これらを
所定電位に維持している。In the illustrated apparatus, support rollers 8.9 and 10 on which the transfer belt 1 is mounted are connected to a power source 13 to maintain them at a predetermined potential.
この場合、各支持ローラに印加するバイアスの極性は、
図示の場合負極性となっているが、感光体３の帯電面の
帯電極性、トナーの極性によって、正または負に適宜設
定することは云う迄もない。In this case, the polarity of the bias applied to each support roller is
In the illustrated case, the polarity is negative, but it goes without saying that the polarity can be appropriately set to positive or negative depending on the charging polarity of the charging surface of the photoreceptor 3 and the polarity of the toner.
このように構成することによって、転写ベルトを、支持
ローラが転写極性と同極性となるようにして転写電流の
、支持ローラを介してのリークを可及的に防止し、転写
にさいしての転写抜け、トナーの飛び敗りなどを阻止し
て、良好な転写性を得ることができる。By configuring the transfer belt in this way, the polarity of the support roller is the same as that of the transfer belt, and leakage of the transfer current through the support roller is prevented as much as possible, and the transfer It is possible to prevent toner from falling out, toner flying, etc., and to obtain good transfer performance.
第２図は本発明の他の実施例を示すもので、この装置に
おいては、転写ベルトを展張する支持ローラ８．９．１
０を、所定電位に維持するために電源１３に接続すると
ともに、スイッチ１４によってこれらローラを適宜アー
スに逃がすように構成しである。FIG. 2 shows another embodiment of the invention, in which a support roller 8.9.1 for stretching the transfer belt is shown.
0 is connected to a power source 13 in order to maintain it at a predetermined potential, and a switch 14 is configured so that these rollers are appropriately grounded.
上記装置の作動を、第３図のシーケンス図によって説明
する。The operation of the above device will be explained with reference to the sequence diagram shown in FIG.
コピースタートキーを押圧してメインモータが発動する
ことによって前回転が開始され、ついで画像形成が行な
われるまえに転写電極２に転写バイアスが印加される。Pre-rotation is started by pressing the copy start key and activating the main motor, and then a transfer bias is applied to the transfer electrode 2 before image formation.
このときまでスイッチ１４は閉となっていて、前回転に
よる転写ベルトのチャージアップを阻止する。Until this time, the switch 14 remains closed to prevent the transfer belt from being charged up due to the previous rotation.
画像形成工程が開始されるまえにスイッチ１４は開とな
り、以後転写工程実施中は、スイッチ１４は開放されて
いるので、各支持ローラは所定電位に維持されて転写電
流のリークはなく、有効に転写に寄与するので良好な転
写性が得られる。The switch 14 is opened before the image forming process is started, and thereafter during the transfer process, the switch 14 is open, so each support roller is maintained at a predetermined potential, and there is no leakage of transfer current, so that the transfer current can be effectively transferred. Since it contributes to transfer, good transferability can be obtained.
ついで、次の転写材が転写部位に到来するまでの紙間に
おいて、スイッチ１４は閉となり、転写ベルトのチャー
ジアップを阻止する。Then, the switch 14 is closed during the paper interval until the next transfer material arrives at the transfer site, thereby preventing the transfer belt from being charged up.
複数枚のコピーを行なう場合には上記の動作が繰り返さ
れ、コピー終了後の後回転時には、スイッチ１４が閉と
なって、転写ベルトの電荷を逃がして停止する。When copying a plurality of sheets, the above-mentioned operation is repeated, and at the time of post-rotation after copying is completed, the switch 14 is closed to release the charge on the transfer belt and stop the transfer belt.
この装置によれば、転写ベルトがチャージアップする傾
向となっても、その都度電荷を逃がすことが出来るので
、該ベルトが大きくチャージアップすることを好く実に
冊止して、常■″１良好な中云写性を得ることができる
。According to this device, even if the transfer belt tends to charge up, it is possible to release the charge each time, so it is possible to easily print books even when the belt is charged up greatly, and it is always good. It is possible to obtain a good photographic quality.
第４図は本発明のさらに他の実施例を示すものである。FIG. 4 shows still another embodiment of the present invention.
この装置においては、各支持ローラ８．９．１０が、バ
リスタ１５を介してアースされている。In this device, each support roller 8.9.10 is grounded via a varistor 15.
このように構成することによって、例えば、バリスタ定
格がＩＫＶであり、転写電極２に一２ＫＶを印加したと
すると、支持ローラが−ＩＫＶになるまでは、電流が転
写ベルトからバリスタを経てアースに逃げることはない
。With this configuration, for example, if the varistor rating is IKV and -2KV is applied to the transfer electrode 2, the current will escape from the transfer belt to the ground via the varistor until the support roller reaches -IKV. Never.
このため感光体方向への転写電流は十分な量が得られて
転写性は向上し、かりに、転写ベルトの空転などによっ
て、ベルトがチャージアップしても、上記の場合、支持
ローラの電位が−ＩＫＶを越えれば、余分な電荷はアー
スに流れるので、チャージアップによる前述のような問
題を生ずることはない。For this reason, a sufficient amount of transfer current is obtained in the direction of the photoreceptor, and the transfer performance is improved.However, even if the transfer belt is charged up due to idling, in the above case, the potential of the support roller is - If IKV is exceeded, the excess charge flows to the ground, so the above-mentioned problem due to charge-up does not occur.
（３）発明の詳細
な説明したように、本発明によるときは、感光体とこれ
に当接する転写ベルトを使用する画像形成装置において
、該転写ベルトを支持する支持ローラの電位を、少なく
とも画像形成工程中、所定極性で所定の値に維持するこ
とによって、転写電流のリークを阻止して転写抜け、線
画像の細りなどの発生による画質の劣化を防止して良質
の画像を得るのに顕著な効果がある。(3) As described in detail, according to the present invention, in an image forming apparatus using a photoreceptor and a transfer belt in contact with the photoreceptor, the potential of the support roller that supports the transfer belt is changed at least during image formation. During the process, maintaining a predetermined polarity at a predetermined value prevents transfer current leakage, prevents deterioration of image quality due to occurrences of transfer omissions, thinning of line images, etc., and is effective in obtaining high-quality images. effective.
第１図は本発明の実施例を示す画像形成装置の要部の概
略側面図、
第２図は本発明の他の実施例を示す画像形成装置の概略
側面図、
第３図は同上の動作シーケンスを示す図、０
第４図は本発明のさらに他の実施例を示す画像形成装置
の概略側面図、
第５図は公知の画像形成装置を説明するための概略側面
図である。
ｌ・・・転写ベルト、２・・・転写電極、３・・・像担
持体（感光体）、４・・・−成帯電器、５・・・画像信
号、７・・・クリーナ、８．９．１０・・・支持ローラ
、１１・・・転写用の電源、１３・・・支持ローラ用電
源、１４・・・スイッチ、１５・・・バリスタ。FIG. 1 is a schematic side view of the main parts of an image forming apparatus showing an embodiment of the present invention, FIG. 2 is a schematic side view of an image forming apparatus showing another embodiment of the present invention, and FIG. 3 is the operation of the same as above. 4 is a schematic side view of an image forming apparatus showing still another embodiment of the present invention, and FIG. 5 is a schematic side view for explaining a known image forming apparatus. l...Transfer belt, 2...Transfer electrode, 3...Image carrier (photoreceptor), 4...-Charger, 5...Image signal, 7...Cleaner, 8. 9.10...Support roller, 11...Power source for transfer, 13...Power source for support roller, 14...Switch, 15...Varistor.
Claims (3)
として形成される転写部位に転写材を挿通するとともに
、転写材裏面から転写バイアスを印加して転写を行なう
ような画像形成装置において、転写ベルトを支持する支
持ローラの電位を、所定極性で所定の値に維持する手段
をそなえてなる画像形成装置。(1) Image formation in which a transfer belt is brought into contact with an image carrier, a transfer material is inserted into a transfer area formed as a contact area between the two, and a transfer bias is applied from the back side of the transfer material to perform the transfer. An image forming apparatus comprising means for maintaining the potential of a support roller that supports a transfer belt at a predetermined value with a predetermined polarity.
電圧を印加する特許請求の範囲第１項記載の画像形成装
置。(2) The image forming apparatus according to claim 1, wherein voltage is applied to the support roller that supports the transfer belt only during transfer.
持展張する支持ローラである特許請求の範囲第１項また
は第２項のいずれか記載の画像形成装置。(3) The image forming apparatus according to claim 1 or 2, wherein the means for applying voltage to the transfer belt is a support roller that supports and stretches the belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32490389A JPH03186876A (en) | 1989-12-16 | 1989-12-16 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32490389A JPH03186876A (en) | 1989-12-16 | 1989-12-16 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03186876A true JPH03186876A (en) | 1991-08-14 |
Family
ID=18170915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32490389A Pending JPH03186876A (en) | 1989-12-16 | 1989-12-16 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03186876A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568829A2 (en) * | 1992-04-09 | 1993-11-10 | Ricoh Company, Ltd | Image forming apparatus |
| US5461461A (en) * | 1992-01-22 | 1995-10-24 | Ricoh Company, Ltd. | Image transferring device and medium separating device for an image forming apparatus |
| US5493371A (en) * | 1993-06-11 | 1996-02-20 | Ricoh Company, Ltd. | Image transferring device for image forming apparatus |
| US5495317A (en) * | 1992-04-20 | 1996-02-27 | Ricoh Company, Ltd. | Image transfer device for an image forming apparatus |
| US5557384A (en) * | 1992-01-22 | 1996-09-17 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5559590A (en) * | 1994-01-19 | 1996-09-24 | Ricoh Company, Ltd. | Image forming apparatus which cleans a transfer belt by applying a bias voltage |
| US5640660A (en) * | 1992-01-22 | 1997-06-17 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5659843A (en) * | 1992-01-22 | 1997-08-19 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5884133A (en) * | 1995-09-06 | 1999-03-16 | Sharp Kabushiki Kaisha | Electrostatic image transfer apparatus |
| US7620354B2 (en) | 2004-03-05 | 2009-11-17 | Canon Kabushiki Kaisha | Image forming apparatus including first and second charge removing members connected to a grounding point |
| KR20130112767A (en) * | 2012-04-03 | 2013-10-14 | 캐논 가부시끼가이샤 | Image forming apparatus |
| JP2013231765A (en) * | 2012-04-27 | 2013-11-14 | Canon Inc | Image forming apparatus |
| WO2016002379A1 (en) * | 2014-06-30 | 2016-01-07 | 京セラドキュメントソリューションズ株式会社 | Transfer apparatus and image forming apparatus |
-
1989
- 1989-12-16 JP JP32490389A patent/JPH03186876A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5461461A (en) * | 1992-01-22 | 1995-10-24 | Ricoh Company, Ltd. | Image transferring device and medium separating device for an image forming apparatus |
| US5557384A (en) * | 1992-01-22 | 1996-09-17 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5640660A (en) * | 1992-01-22 | 1997-06-17 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5659843A (en) * | 1992-01-22 | 1997-08-19 | Ricoh Company, Ltd. | Image transferring device for image forming equipment |
| US5666622A (en) * | 1992-01-22 | 1997-09-09 | Ricoh Company, Ltd. | Image transferring device and medium separating device for an image forming apparatus |
| EP0568829A2 (en) * | 1992-04-09 | 1993-11-10 | Ricoh Company, Ltd | Image forming apparatus |
| EP0568829A3 (en) * | 1992-04-09 | 1995-05-10 | Ricoh Kk | Image forming apparatus. |
| US5495317A (en) * | 1992-04-20 | 1996-02-27 | Ricoh Company, Ltd. | Image transfer device for an image forming apparatus |
| US5493371A (en) * | 1993-06-11 | 1996-02-20 | Ricoh Company, Ltd. | Image transferring device for image forming apparatus |
| US5559590A (en) * | 1994-01-19 | 1996-09-24 | Ricoh Company, Ltd. | Image forming apparatus which cleans a transfer belt by applying a bias voltage |
| US5884133A (en) * | 1995-09-06 | 1999-03-16 | Sharp Kabushiki Kaisha | Electrostatic image transfer apparatus |
| US7620354B2 (en) | 2004-03-05 | 2009-11-17 | Canon Kabushiki Kaisha | Image forming apparatus including first and second charge removing members connected to a grounding point |
| KR20130112767A (en) * | 2012-04-03 | 2013-10-14 | 캐논 가부시끼가이샤 | Image forming apparatus |
| US9158238B2 (en) | 2012-04-03 | 2015-10-13 | Canon Kabushiki Kaisha | Image forming apparatus using stretch member and contact member to maintain potential with current flowing from current supply member to intermediate transfer belt |
| US9417568B2 (en) | 2012-04-03 | 2016-08-16 | Canon Kabushiki Kaisha | Image forming apparatus using stretch member and contact member to maintain potential with a current flowing to intermediate transfer belt |
| JP2013231765A (en) * | 2012-04-27 | 2013-11-14 | Canon Inc | Image forming apparatus |
| WO2016002379A1 (en) * | 2014-06-30 | 2016-01-07 | 京セラドキュメントソリューションズ株式会社 | Transfer apparatus and image forming apparatus |
| EP3021170A4 (en) * | 2014-06-30 | 2016-08-17 | Kyocera Document Solutions Inc | Transfer apparatus and image forming apparatus |
| US9575440B2 (en) | 2014-06-30 | 2017-02-21 | Kyocera Document Solutions Inc. | Transfer device, image forming apparatus |
| JPWO2016002379A1 (en) * | 2014-06-30 | 2017-04-27 | 京セラドキュメントソリューションズ株式会社 | Transfer device, image forming device |
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