JPH09134082A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH09134082A JPH09134082A JP29280195A JP29280195A JPH09134082A JP H09134082 A JPH09134082 A JP H09134082A JP 29280195 A JP29280195 A JP 29280195A JP 29280195 A JP29280195 A JP 29280195A JP H09134082 A JPH09134082 A JP H09134082A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- belt
- transfer material
- roller
- image
- 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
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複写機、普通紙フ
ァクシミリ、プリンター等の電子写真方式の画像形成装
置に関し、特に、転写手段として転写搬送ベルトを用い
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 electrophotographic image forming apparatus such as a copying machine, a plain paper facsimile, and a printer, and more particularly to an image forming apparatus using a transfer / transport belt as a transfer means.
【０００２】[0002]
【従来の技術】複写機等の電子写真方式の画像形成装置
においては、像担持体である感光体を帯電した後、露光
装置により原稿像を直接露光するか、あるいはレーザ走
査光学系やＬＥＤ光書込光学系等により画像信号に応じ
た光書き込みを行ない、感光体上に静電潜像を形成し、
該潜像を現像装置のトナーにより現像して顕像化し、こ
のトナー像を転写紙やフィルム等の転写材に転写する。
そして転写後の転写材を定着装置に搬送し、定着装置で
トナー像を定着して画像を得ている。このような画像形
成装置において、トナー像を転写材に転写させ、且つ転
写後の転写材を感光体から分離し定着部に搬送する手段
として、転写搬送ベルトを用いたものが知られている。2. Description of the Related Art In an electrophotographic image forming apparatus such as a copying machine, an image of a document is directly exposed by an exposing device after charging a photoconductor as an image carrier, or a laser scanning optical system or LED light is used. Optical writing according to the image signal is performed by a writing optical system, etc., and an electrostatic latent image is formed on the photoconductor,
The latent image is developed with toner in a developing device to be visualized, and the toner image is transferred to a transfer material such as transfer paper or film.
Then, the transfer material after the transfer is conveyed to a fixing device, and the toner image is fixed by the fixing device to obtain an image. In such an image forming apparatus, as a means for transferring a toner image onto a transfer material and separating the transfer material after transfer from the photoconductor to convey it to the fixing portion, there is known one using a transfer / transport belt.
【０００３】転写搬送ベルトは、ゴム系や樹脂系材料等
の弾性部材からなる無端状ベルトであり、駆動ローラ
ー、従動ローラー、転写バイアスローラー等の複数のロ
ーラーに張架されて感光体に対向配置され、感光体との
間のニップ部で転写材を挾持搬送して感光体上に形成さ
れたトナー像を転写材に静電的に転写させ、転写後の転
写材を感光体から分離して定着部に向けて搬送する。そ
して、定着部まで搬送された転写材は転写搬送ベルトか
ら分離されて定着装置に送り込まれ、トナー像が定着さ
れる。また、転写搬送ベルト走行方向の転写材分離部よ
り下流側には、転写搬送ベルトを挾んで前記複数のロー
ラーの少なくとも１つと対向してクリーニング部材（例
えばクリーニングブレード）が設けられており、転写材
分離後の転写搬送ベルトの表面に付着したトナーや紙粉
等を除去するようになっている。The transfer / conveying belt is an endless belt made of an elastic member such as a rubber-based or resin-based material, and is stretched around a plurality of rollers such as a driving roller, a driven roller, and a transfer bias roller, and arranged to face the photoconductor. Then, the transfer material is nipped and conveyed at the nip portion between the photoreceptor and the toner image formed on the photoreceptor is electrostatically transferred to the transfer material, and the transfer material after transfer is separated from the photoreceptor. It is conveyed toward the fixing unit. Then, the transfer material conveyed to the fixing unit is separated from the transfer conveyance belt and sent to the fixing device, and the toner image is fixed. In addition, a cleaning member (for example, a cleaning blade) is provided on the downstream side of the transfer material separating portion in the traveling direction of the transfer transfer belt so as to face at least one of the plurality of rollers across the transfer transfer belt. After the separation, the toner, paper dust, etc. adhering to the surface of the transfer / conveying belt are removed.
【０００４】[0004]
【発明が解決しようとする課題】ところで、転写搬送ベ
ルトは転写材を静電吸着して搬送しており、転写搬送ベ
ルトを張架するローラーの中の一つのローラー部分での
ベルトの曲りと転写材の剛性を利用して転写材を転写搬
送ベルトから剥離して両者を分離しているが、転写材と
転写搬送ベルトは静電吸着していたため、転写材が転写
搬送ベルトから分離する際に、両者の間で剥離放電を起
こす。この分離部位置では転写材上のトナー画像は未定
着であり、静電気力により転写材上に付着している不安
定な状態にあるため、上記の剥離放電の状態が激しい
と、その衝撃によって転写材上の未定着トナーが飛び散
り、トナー画像が乱れるという問題がある。By the way, the transfer / conveyance belt conveys the transfer material by electrostatic attraction, and the bending and transfer of the belt at one roller portion among the rollers for stretching the transfer / conveyance belt. The rigidity of the material is used to separate the transfer material from the transfer conveyor belt to separate them, but since the transfer material and the transfer conveyor belt were electrostatically attracted, when the transfer material is separated from the transfer conveyor belt. , A peeling discharge is generated between the two. At this separation position, the toner image on the transfer material is unfixed and is in an unstable state where it is attached to the transfer material due to electrostatic force. There is a problem that unfixed toner on the material scatters and the toner image is disturbed.
【０００５】一般に、転写材とベルトのギャップが離れ
ている時の方が一つ一つの放電の電荷量は大きい。すな
わち、転写材がベルトから分離した直後の両者の間隔が
小さい間は両者間の電位差が小さく放電は生じないが、
転写材をベルトから分離後、転写材とベルトのギャップ
が大きくなるに従って両者間の電位差が大きくなり、あ
る大きさのギャップを超えると放電が生じる。このよう
な放電では上記のように一つ一つの放電の電荷量は大き
いため、剥離放電跡のトナー像の乱れが大きく目立ちや
すくなる。Generally, the amount of electric charge for each discharge is larger when the gap between the transfer material and the belt is larger. That is, immediately after the transfer material is separated from the belt, while the gap between the two is small, the potential difference between the two is small and no discharge occurs,
After the transfer material is separated from the belt, the potential difference between the transfer material and the belt increases as the gap between the transfer material and the belt increases, and when a gap of a certain size is exceeded, discharge occurs. In such discharge, since the amount of charge of each discharge is large as described above, the disturbance of the toner image on the trace of the peeling discharge becomes large and becomes conspicuous.
【０００６】本発明は上記事情に鑑みなされたものであ
って、転写材分離時の剥離放電の衝撃を小さくして、ト
ナー像の乱れ具合の程度を小さくすることができる構成
を備えた画像形成装置を提供することを目的としてい
る。The present invention has been made in view of the above circumstances, and an image forming having a structure capable of reducing the impact of the peeling discharge at the time of separating the transfer material to reduce the degree of the disorder of the toner image. The purpose is to provide a device.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明は、像担持体に対向配置され、像担
持体との間のニップ部で転写材を挾持搬送して像担持体
上に形成されたトナー像を転写材に静電的に転写させ、
転写後の転写材を像担持体から分離して定着部に向けて
搬送する転写搬送ベルトを転写手段に用いた画像形成装
置に関するものであり、前記転写搬送ベルトからの転写
材分離部において転写搬送ベルトが持つ電荷がベルト支
持部材の少なくとも一部に漏洩する場合に、転写搬送ベ
ルトからの転写材分離部のベルト裏面側に位置するベル
ト支持部材の少なくとも一部に転写バイアスと同極性の
電荷を付与する手段を備えたものである。In order to achieve the above object, the invention of claim 1 is arranged opposite to an image carrier, and a transfer material is sandwiched and conveyed at a nip portion between the image carrier and the image carrier. The toner image formed on the body is electrostatically transferred to a transfer material,
The present invention relates to an image forming apparatus that uses as a transfer means a transfer conveyance belt that separates a transfer material after transfer from an image carrier and conveys it toward a fixing unit. When the electric charge of the belt leaks to at least a part of the belt supporting member, the electric charge having the same polarity as the transfer bias is applied to at least a part of the belt supporting member located on the belt back surface side of the transfer material separating portion from the transfer conveying belt. It is provided with a means for giving.
【０００８】また、請求項２の発明では、前記転写搬送
ベルトからの転写材分離部において転写搬送ベルトが持
つ電荷がベルト支持部材の少なくとも一部に漏洩する場
合に、転写搬送ベルトからの転写材分離部のベルト裏面
側に位置するベルト支持部材の少なくとも一部が抵抗を
介して接地している構成としたものである。According to the second aspect of the present invention, in the case where the charge carried by the transfer carrying belt leaks to at least a part of the belt supporting member in the transfer material separating portion from the transfer carrying belt, the transfer material from the transfer carrying belt is released. At least a part of the belt support member located on the belt back surface side of the separating portion is grounded via a resistor.
【０００９】[0009]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を詳細に説明する。図１は本発明の一実施例を
示す画像形成装置の概略構成図である。図１において、
符号１は像担持体としての感光体ドラムであり、その周
囲には、帯電装置２、原稿像の露光装置あるいはレーザ
やＬＥＤアレイ等を用いた光書込装置からなる潜像形成
手段３、現像装置４、転写搬送ベルト５、クリーニング
装置６、除電装置７、転写前除電装置９等の電子写真方
式の画像形成を行なうための装置類が配置されている。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an image forming apparatus showing one embodiment of the present invention. In FIG.
Reference numeral 1 is a photosensitive drum as an image bearing member, and a charging device 2, a document image exposing device, a latent image forming means 3 including an optical writing device using a laser, an LED array, or the like, and a developing device around the photosensitive drum. Devices such as the device 4, the transfer / conveyance belt 5, the cleaning device 6, the static eliminator 7, and the pre-transfer static eliminator 9 are provided for performing electrophotographic image formation.
【００１０】画像形成動作が開始されると、感光体ドラ
ム１は図示しない駆動部により回転駆動されて、帯電装
置２により均一に帯電された後、潜像形成手段（画像露
光、あるいは光書込装置による光書込）３により静電潜
像が形成される。そして、この静電潜像は現像装置４の
現像剤により現像され、トナー像が形成される。また、
上記画像形成動作とタイミングを合わせて、転写紙やフ
ィルム等の転写材Ｓが図示しない給紙装置から給紙コロ
等を介して給紙されてレジストローラー１０の手前で待
機する。When the image forming operation is started, the photosensitive drum 1 is rotationally driven by a driving unit (not shown) and uniformly charged by the charging device 2, and thereafter, latent image forming means (image exposure or optical writing) is performed. An electrostatic latent image is formed by (optical writing) 3 by the device. Then, this electrostatic latent image is developed by the developer of the developing device 4 to form a toner image. Also,
In synchronism with the image forming operation, a transfer material S such as a transfer paper or a film is fed from a paper feeding device (not shown) via a paper feeding roller or the like and stands by in front of the registration roller 10.
【００１１】レジストローラー１０は感光体ドラム１上
のトナー像にタイミングを合わせて転写材Ｓを送出す
る。感光体ドラム１上のトナー像は、転写前除電装置９
によりその静電吸着力が弱められており、転写バイアス
ローラー１３により転写バイアスが印加された状態で転
写材Ｓが感光体ドラム１と転写搬送ベルト５の間のニッ
プ部で挾持搬送されると、感光体ドラム１上のトナー像
が転写材Ｓに転写される。そして、トナー像転写後の転
写材Ｓは感光体ドラム１から分離され、転写搬送ベルト
５により定着装置８に向けて搬送され、駆動ローラー１
１部分のベルトの曲りと転写材自身の剛性により、転写
材Ｓは転写搬送ベルト５から分離され、定着装置８に送
り込まれる。そして、定着装置８の加熱ローラー８ａと
加圧ローラー８ｂとにより転写材上のトナー像が定着さ
れ、定着後の転写材Ｓは図示しない排紙トレイに排紙さ
れる。一方、トナー像転写後の感光体ドラム１は、クリ
ーニング装置６により残留トナーが除去され、除電装置
７により除電される。また、転写材分離後の転写搬送ベ
ルト５はクリーニングブレード等のクリーニング手段１
４により表面のトナーや紙粉等の付着物が除去される。The registration roller 10 sends the transfer material S in time with the toner image on the photosensitive drum 1. The toner image on the photosensitive drum 1 is transferred to the pre-transfer charge eliminating device 9
The electrostatic attraction force is weakened by, and when the transfer material S is sandwiched and conveyed at the nip portion between the photoconductor drum 1 and the transfer / conveying belt 5 while the transfer bias is applied by the transfer bias roller 13, The toner image on the photosensitive drum 1 is transferred to the transfer material S. Then, the transfer material S after the transfer of the toner image is separated from the photosensitive drum 1, and is conveyed toward the fixing device 8 by the transfer / conveying belt 5, and the driving roller 1
The transfer material S is separated from the transfer conveyance belt 5 and fed into the fixing device 8 due to the bending of the belt in one portion and the rigidity of the transfer material itself. Then, the toner image on the transfer material is fixed by the heating roller 8a and the pressure roller 8b of the fixing device 8, and the transfer material S after fixing is discharged to a discharge tray (not shown). On the other hand, after the toner image has been transferred, the cleaning device 6 removes residual toner from the photosensitive drum 1, and the charge removing device 7 removes the charge. Further, the transfer conveyance belt 5 after the transfer material is separated is a cleaning unit 1 such as a cleaning blade.
By 4, the adhered substances such as toner and paper powder on the surface are removed.
【００１２】さて、以上のような構成の画像形成装置に
おいては、転写搬送ベルト５は駆動ローラー１１、従動
ローラー１２、転写バイアスローラー１３等の複数のロ
ーラーに張架されており、転写バイアスローラー１３を
介して転写バイアス印加電源１５による転写バイアスが
印加され、転写材Ｓを静電吸着して搬送している。そし
て、転写搬送ベルト５を張架する複数のローラーの中の
一つのローラー（図示の例では駆動ローラー１１）部分
でのベルトの曲りと転写材の剛性を利用して転写材Ｓを
転写搬送ベルト５から剥離して両者を分離しているが、
転写材Ｓが転写搬送ベルト５から分離する際に、両者の
間で剥離放電を起こすという問題がある。ここで、図４
を参照して転写材分離時の剥離放電について説明する。In the image forming apparatus having the above structure, the transfer / conveyance belt 5 is stretched around a plurality of rollers such as the driving roller 11, the driven roller 12, and the transfer bias roller 13, and the transfer bias roller 13 is provided. A transfer bias is applied from the transfer bias applying power supply 15 via the transfer material S, and the transfer material S is electrostatically adsorbed and conveyed. Then, the transfer material S is transferred and transferred by utilizing the bending of the belt and the rigidity of the transfer material at one roller (the driving roller 11 in the illustrated example) of the plurality of rollers that stretch the transfer and transfer belt 5. Although it is separated from 5 to separate them,
When the transfer material S is separated from the transfer conveyance belt 5, there is a problem that peeling discharge occurs between the two. Here, FIG.
The peeling discharge at the time of separating the transfer material will be described with reference to FIG.
【００１３】図４に示すように、感光体ドラム１が負帯
電しており、転写バイアスが正極性であるとする。感光
体ドラム１と転写材Ｓが分離する際には、剥離放電によ
り感光体ドラム側へ正電荷、転写材側へは負電荷が移動
する。この時、剥離放電量は転写バイアス印加条件に大
きく影響される。本構成例では転写バイアスローラー１
２を用いて定電流制御で５０μＡの転写電流が流れるよ
うに転写バイアスを印加している。尚、転写バイアス印
加手段としては、図示のようなローラーでなくてもよ
く、コロナチャージャー等を用いてもよい。また、定電
流制御でなくとも定電圧制御でも可能である。また、転
写搬送ベルトの体積固有抵抗は約１０10Ω・cm、ローラ
ー側（ベルト裏面側）の表面抵抗は約１０8Ωであっ
た。感光体ドラム１から分離した後の転写搬送ベルト５
上の転写材Ｓは、トナーの他に、感光体ドラム１からの
分離時に生じる剥離放電等の電荷注入によって負帯電し
ている。As shown in FIG. 4, it is assumed that the photosensitive drum 1 is negatively charged and the transfer bias is positive. When the photoconductor drum 1 and the transfer material S are separated from each other, a positive charge moves to the photoconductor drum side and a negative charge moves to the transfer material side due to peeling discharge. At this time, the peeling discharge amount is greatly affected by the transfer bias application condition. In this configuration example, the transfer bias roller 1
2, the transfer bias is applied so that a transfer current of 50 μA flows under constant current control. The transfer bias applying means need not be the roller shown in the figure, and may be a corona charger or the like. Also, constant voltage control is possible instead of constant current control. The volume specific resistance of the transfer / conveyance belt was about 10 10 Ω · cm, and the surface resistance on the roller side (back side of the belt) was about 10 8 Ω. Transfer conveyance belt 5 after being separated from the photoconductor drum 1.
In addition to the toner, the upper transfer material S is negatively charged by charge injection such as peeling discharge that occurs at the time of separation from the photosensitive drum 1.
【００１４】上記のように、転写材Ｓは負帯電してお
り、転写搬送ベルト５は正帯電しているため、転写材Ｓ
と転写搬送ベルト５の分離部において分離する際に、パ
ッシェンの法則を満たすような条件になると剥離放電を
起こす。分離直後の転写材Ｓと転写搬送ベルト５とのギ
ャップが極めて小さい時には空気層の静電容量が極めて
大きく、転写材表面とベルト裏面側との電位差Ｖ(Gap
小）は以下の式で表され、Ｖ(Gap小）はあまり大きくな
らない。 Ｖ(Gap小)＝（Ｑ(paper)−Ｑ(Belt)）／Ｃ(Gap小) ・・・(1) 但し、Ｑ(paper):転写材表面の電荷量， Ｑ(Belt) :ベルト裏面の電荷量， Ｃ(Gap小):air Gapが小の時のベルトや転写材層込みの
静電容量．As described above, since the transfer material S is negatively charged and the transfer / conveying belt 5 is positively charged, the transfer material S is
At the time of separation at the separation part of the transfer / conveyance belt 5, peeling discharge occurs under the condition that Paschen's law is satisfied. When the gap between the transfer material S and the transfer / conveying belt 5 immediately after separation is extremely small, the electrostatic capacity of the air layer is very large, and the potential difference V (Gap
Small) is expressed by the following formula, and V (Gap small) does not become so large. V (Gap small) = (Q (paper) -Q (Belt)) / C (Gap small) (1) However, Q (paper): charge amount on the transfer material surface, Q (Belt): back side of belt Charge amount, C (small Gap): capacitance including belt and transfer material layer when air Gap is small.
【００１５】しかし、転写材Ｓが搬送されて転写材Ｓと
転写搬送ベルト５とのギャップが徐々に大きくなると、
空気層の静電容量は小さくなり、転写材表面とベルト裏
面側との電位差Ｖ(Gap大）は、 Ｖ(Gap大）＝（Ｑ(paper)−Ｑ(Belt)）／Ｃ(Gap大) ・・・(2) Ｃ(Gap大)＜Ｃ(Gap小) Ｃ(Gap大):air Gapが大の時のベルトや転写材層込みの
静電容量． となり、電荷量が変化しなくても、Ｖ(Gap大）は大きく
なる。そして、ある電位になるとパッシェン放電を起こ
す。However, when the transfer material S is transported and the gap between the transfer material S and the transfer transport belt 5 gradually increases,
The capacitance of the air layer becomes small, and the potential difference V (Gap large) between the transfer material front surface and the belt back surface side is V (Gap large) = (Q (paper) -Q (Belt)) / C (Gap large) (2) C (large Gap) <C (small Gap) C (large Gap): Capacitance including belt and transfer material layer when air Gap is large. Therefore, V (large Gap) increases even if the charge amount does not change. Then, Paschen discharge occurs at a certain potential.
【００１６】転写材上のトナーは、転写材Ｓの電荷及び
転写搬送ベルト５の電荷等による電界の静電気力に拘束
されているため、放電により電界が乱れるとトナー像も
乱れる。従って、上述のようにギャップが大きくなって
からの放電は一つ一つの放電量が大きくなるため、トナ
ー像の乱れ方も激しい。尚、Ｖ(Gap小)、Ｖ(Gap大)の値
は剥離放電が発生する空気層の電位差とは異なるが、ギ
ャップにより容量が変化するのは空気層のため、同様に
考える。Since the toner on the transfer material is bound by the electrostatic force of the electric field due to the charge of the transfer material S and the charge of the transfer / conveying belt 5, the toner image is also disturbed when the electric field is disturbed by the discharge. Therefore, as described above, since the discharge amount after each gap becomes large becomes large, the toner image is also disturbed severely. The values of V (small Gap) and V (large Gap) are different from the potential difference of the air layer in which peeling discharge occurs, but the capacity changes due to the gap because it is the air layer, and so the same consideration is made.
【００１７】さて、図４により、転写材Ｓが転写搬送ベ
ルト５から分離する際の、両者の間での剥離放電の様子
を示したが（尚、転写材表面上の電荷量は、転写プロセ
ス時の転写バイアス印加条件によって大きく影響され
る）、転写材が転写搬送ベルトから分離した直後のギャ
ップが小さい時には、空気層の静電容量が大きいため、
電位差Ｖ(Gap小）はあまり大きくなく放電は起こりにく
い。しかし、転写材が搬送され、徐々にギャップが大き
くなるに従って空気層の静電容量は小さくなる。また、
放電しやすい所に電荷が集中していくことにより放電が
起きやすく、かつ一つ一つの放電量が大きくなる。よっ
て、ギャップが大きくなるに従って局所的に大きな剥離
放電が起こり、剥離放電跡のトナー像の乱れ具合は大き
く、目立ちやすくなる。FIG. 4 shows the state of the peeling discharge between the transfer material S and the transfer material 5 when the transfer material S is separated from the transfer material belt 5 (note that the charge amount on the surface of the transfer material depends on the transfer process). When the gap immediately after the transfer material is separated from the transfer conveyance belt is small, the capacitance of the air layer is large,
The potential difference V (small Gap) is not so large that discharge is unlikely to occur. However, as the transfer material is conveyed and the gap gradually increases, the capacitance of the air layer decreases. Also,
Since the electric charge concentrates on the places where it is easy to discharge, discharge easily occurs and the amount of each discharge becomes large. Therefore, as the gap becomes larger, large peeling discharge locally occurs, and the degree of disorder of the toner image at the trace of peeling discharge becomes large, making it more noticeable.
【００１８】また従来、転写材と転写搬送ベルトとの分
離部における剥離放電を積極的に発生させるため、転写
の正電荷を転写搬送ベルトを介して転写材と転写搬送ベ
ルトとの分離部に供給することが行なわれた。しかし、
図４に示すようにベルト支持部材（ローラー等）が接地
されていたために漏洩したり、正電荷を供給するために
必ずしも転写電流が適正ではなく、過剰となってしまう
ことがしばしばであった。それによって、トナー転写率
が低下することもあった。Further, conventionally, in order to positively generate peeling discharge in the separation portion between the transfer material and the transfer conveyance belt, a positive charge for transfer is supplied to the separation portion between the transfer material and the transfer conveyance belt via the transfer conveyance belt. What was done was done. But,
As shown in FIG. 4, since the belt supporting member (roller or the like) is grounded, it leaks, or the transfer current is not always appropriate because the positive charge is supplied, and the transfer current often becomes excessive. As a result, the toner transfer rate may decrease.
【００１９】（実施例１）そこで本発明では、転写材分
離時の剥離放電の衝撃を小さくして、トナー像の乱れ具
合の程度を小さくするための一つの手段として、図１に
示すように、転写搬送ベルト５が持つ電荷がベルト支持
部材（ローラー等）の少なくとも一部に漏洩する場合
に、転写搬送ベルト５からの転写材分離部のベルト裏面
側に位置するベルト支持部材（図示の例では駆動ローラ
ー）１１の少なくとも一部に転写バイアスと同極性の電
荷を付与する手段１６を設けたものである。(Embodiment 1) Therefore, in the present invention, as one means for reducing the impact of the peeling discharge at the time of separating the transfer material to reduce the degree of the disorder of the toner image, as shown in FIG. When the charge carried by the transfer / transport belt 5 leaks to at least a part of the belt support member (roller or the like), the belt support member located on the belt back surface side of the transfer material separating portion from the transfer / transport belt 5 (the example shown in the figure). Then, at least a part of the driving roller 11 is provided with a means 16 for applying a charge having the same polarity as the transfer bias.
【００２０】以下、図２により本実施例の構成及び動作
を説明する。図２に示すように、本実施例では、転写搬
送ベルト５からの転写材分離部に位置するローラー１１
に正電荷（転写バイアスと同極性）を付与する電源１６
を設けたものであり、これにより前記(1) 式、 Ｖ(Gap小)＝（Ｑ(paper)−Ｑ(Belt)）／Ｃ(Gap小) のベルト裏面の電荷量Ｑ(Belt)が大となる。よって、｜
Ｑ(paper)−Ｑ(Belt)｜の値が大きくなるので、｜Ｖ(Ga
p小)｜の値も大きくなって放電し易くなり、分離直後の
転写材と転写搬送ベルトとのギャップが小さいうちに放
電が起きる。尚、ギャップが小さい時ほど「放電し易い
所へ電荷が集中している」という現象があまり起きてい
ないので、分離部に近い所で小さな放電が数多く均一に
発生するということになり、トナー像の乱れ方の程度が
良くなり（局所的な大きな放電が起こらないため、トナ
ー像の乱れ具合は微小であり）、目立たなくなった。The configuration and operation of this embodiment will be described below with reference to FIG. As shown in FIG. 2, in this embodiment, the roller 11 located at the transfer material separating portion from the transfer / conveying belt 5 is used.
Power supply 16 for applying a positive charge (same polarity as the transfer bias) to the
Therefore, the charge amount Q (Belt) on the back surface of the belt of the above formula (1), V (Gap small) = (Q (paper) −Q (Belt)) / C (Gap small), is large. Becomes Therefore, |
Since the value of Q (paper) -Q (Belt) | becomes large, | V (Ga
The value of (small p) | also increases and discharge becomes easier, and discharge occurs while the gap between the transfer material and the transfer conveyance belt immediately after separation is small. It should be noted that the smaller the gap is, the less the phenomenon that "the electric charges are concentrated in the places where it is easy to discharge" does not occur so many small discharges are uniformly generated in the vicinity of the separation portion, and the toner image The degree of disorder of the toner image was improved (since a large local discharge does not occur, the toner image is slightly disordered) and became less noticeable.
【００２１】次に、図１，２に示す構成の画像形成装置
において、転写バイアスローラー１３から転写搬送ベル
ト５へ印加する印加電流を＋５０μＡ（印加電圧約５Ｋ
Ｖ）として、感光体ドラム１から転写材Ｓへの画像転写
を行なった。そして、従来条件の分離部のローラー１１
を接地した場合（図４）と、分離部のローラー１１に電
源１６により転写バイアスと同極性の電荷を付与した場
合（図１，２）を比べると、剥離放電跡のトナー像の乱
れの程度は以下のようになった。 接地≒＋１ＫＶ（−３μＡ）＜＋２ＫＶ（−２μＡ）＜
＋３ＫＶ（−１μＡ）＜＋４ＫＶ（＋１．５μＡ）＜＋
５ＫＶ（＋３μＡ） 尚、不等号の大きい方がトナー像の乱れの程度が良い
（すなわち、トナー像の乱れ具合の程度が小さい）こと
を示している。また、（）内の電流値は、画像転写時に
転写バイアスと同極性の電荷を付与する電源１６から分
離部のローラー１１へ流れた電流である。Next, in the image forming apparatus having the structure shown in FIGS. 1 and 2, the applied current applied from the transfer bias roller 13 to the transfer conveyance belt 5 is +50 μA (applied voltage of about 5K).
As V), the image transfer from the photosensitive drum 1 to the transfer material S was performed. Then, the roller 11 of the separation unit under the conventional condition
Comparing the case where the toner is grounded (FIG. 4) and the case where a charge having the same polarity as the transfer bias is applied to the roller 11 of the separation portion by the power supply 16 (FIGS. 1 and 2) Became as follows. Ground ≈ + 1KV (-3μA) <+ 2KV (-2μA) <
+3 KV (-1 μA) <+4 KV (+1.5 μA) <+
5 KV (+3 μA) It should be noted that the larger the inequality sign, the better the degree of disturbance of the toner image (that is, the smaller the degree of disturbance of the toner image). The current value in parentheses is the current that flows from the power supply 16 that applies electric charges of the same polarity as the transfer bias during image transfer to the roller 11 of the separation unit.
【００２２】上記のように、分離部のローラー１１に電
源１６により転写バイアスと同極性の電荷を付与した場
合の方が、剥離放電跡のトナー像の乱れの程度が良くな
り、目立たなくなる。これは分離部のローラー１１にバ
イアスを印加することによって、転写材裏面と転写搬送
ベルト表面との電位差が大きくなり、それによって、通
常では放電が発生しないような小さなギャップにおいて
も、放電が発生するようになったためである。また、分
離部のローラー１１に５ＫＶのバイアスを印加した時、
転写バイアスローラー１３から転写搬送ベルト５への印
加電流を＋３０μＡに減らしても、転写印加電流が＋５
０μＡ時のトナー像の乱れの程度とほぼ同じにすること
ができた。また、トナー転写率は転写印加電流をより適
正値に近づけたことによって約１０％上昇した。As described above, when the electric power having the same polarity as that of the transfer bias is applied to the roller 11 of the separating portion by the power source 16, the toner image on the trace of the peeling discharge is more disturbed and less noticeable. This is because by applying a bias to the roller 11 of the separating portion, the potential difference between the back surface of the transfer material and the front surface of the transfer conveyance belt becomes large, so that discharge is generated even in a small gap where discharge is not normally generated. This is because. Further, when a bias of 5 KV is applied to the roller 11 of the separating section,
Even if the current applied from the transfer bias roller 13 to the transfer / transport belt 5 is reduced to +30 μA, the transfer current is +5.
The degree of disturbance of the toner image at 0 μA could be made almost the same. Further, the toner transfer rate was increased by about 10% by making the transfer applied current closer to the proper value.
【００２３】尚、本実施例では転写バイアス印加電源１
５とは別の電源１６を分離部のローラー１１に接続した
例を示したが、転写バイアス印加電圧より低い値に設定
するのであれば、転写バイアス印加電源１５から低電圧
素子を用いて分離部のローラー１１に電荷を付与する構
成としても良い。また、この場合、静電容量負荷を併用
すれば、転写バイアス印加電源のＯＦＦ後、転写材後端
が転写搬送ベルト５から分離するまで、分離部のローラ
ー１１に確実に電荷を付与し、希望の電位差を維持する
ことができる。In this embodiment, the transfer bias applying power source 1
Although an example in which a power source 16 different from 5 is connected to the roller 11 of the separating unit is shown, if the voltage is set to a value lower than the transfer bias applying voltage, the separating unit using the low voltage element from the transfer bias applying power source 15 is used. The roller 11 may be provided with an electric charge. Further, in this case, if a capacitive load is also used, after the transfer bias application power is turned off, the roller 11 of the separating portion is surely charged with electric charge until the rear end of the transfer material is separated from the transfer conveying belt 5. The potential difference can be maintained.
【００２４】（実施例２）次に、本発明の別の実施の形
態について説明する。本発明では、転写材分離時の剥離
放電の衝撃を小さくして、トナー像の乱れ具合の程度を
小さくするための別の手段として、図３に示すように、
転写搬送ベルト５からの転写材分離部において、転写搬
送ベルト５が持つ電荷がベルト支持部材（ローラー等）
の少なくとも一部に漏洩する場合に、転写搬送ベルト５
からの転写材分離部のベルト裏面側に位置するベルト支
持部材（図では駆動ローラー）１１の少なくとも一部が
抵抗１７を介して接地している構成としたものである。(Embodiment 2) Next, another embodiment of the present invention will be described. In the present invention, as another means for reducing the impact of the peeling discharge at the time of separating the transfer material to reduce the degree of the disorder of the toner image, as shown in FIG.
In the transfer material separating portion from the transfer / transport belt 5, the charge carried by the transfer / transport belt 5 is a belt supporting member (roller or the like).
Transfer conveyor belt 5 when it leaks to at least a part of
At least a part of the belt supporting member (driving roller in the figure) 11 located on the belt back surface side of the transfer material separating portion from is grounded via the resistor 17.
【００２５】図３に示すように、転写搬送ベルト５自体
が転写バイアスローラー１３の放電によって帯電してお
り、また、転写搬送ベルト５の表面及び内部を転写バイ
アスローラー１３からの電荷が流れてくる。その電荷を
抵抗１７を介して接地することにより、前述の実施例１
と同様の効果を得ることができる。また、本実施例で
は、抵抗を付加するだけでよいので安上がりである。As shown in FIG. 3, the transfer / transport belt 5 itself is charged by the discharge of the transfer bias roller 13, and the charge from the transfer bias roller 13 flows on the surface and inside of the transfer / transport belt 5. . By grounding the electric charge through the resistor 17, the above-mentioned first embodiment
The same effect as described above can be obtained. Further, in the present embodiment, it is inexpensive because it is only necessary to add a resistance.
【００２６】次に、図３に示す構成の画像形成装置にお
いて、転写バイアスローラー１３から転写搬送ベルト５
へ印加する印加電流を＋５０μＡ（印加電圧約５ＫＶ）
として、感光体ドラム１から転写材Ｓへの画像転写を行
なった。そして、従来の分離部のローラー１１が接地さ
れている状態（図４）では、分離部のローラー１１から
アースへ７μＡの電流が流れた。これに対して、分離部
のローラー１１を抵抗を介して接地した場合（図３）、
分離部のローラー１１の電位は以下の表１のようになっ
た。Next, in the image forming apparatus having the configuration shown in FIG. 3, the transfer bias roller 13 to the transfer / transport belt 5 are transferred.
+ 50μA (applied voltage approx. 5KV)
As a result, an image was transferred from the photosensitive drum 1 to the transfer material S. Then, in the state where the roller 11 of the conventional separation section is grounded (FIG. 4), a current of 7 μA flows from the roller 11 of the separation section to the ground. On the other hand, when the roller 11 of the separating portion is grounded via a resistor (FIG. 3),
The potential of the roller 11 in the separation section is shown in Table 1 below.
【００２７】[0027]
【表１】 [Table 1]
【００２８】また、転写バイアスローラー１３から転写
搬送ベルト５へ印加する印加電流を＋３０μＡとして、
感光体ドラム１から転写材Ｓへの画像転写を行なった場
合、分離部のローラー１１の電位は以下の表２のように
なった。また、従来の分離部のローラーが接地されてい
る状態（図４）では、分離部のローラー１１からアース
へ４μＡの電流が流れた。The applied current applied from the transfer bias roller 13 to the transfer / conveying belt 5 is +30 μA.
When an image was transferred from the photoconductor drum 1 to the transfer material S, the potential of the roller 11 in the separation section was as shown in Table 2 below. Further, in the state where the roller of the conventional separating section is grounded (FIG. 4), a current of 4 μA flows from the roller 11 of the separating section to the ground.
【００２９】[0029]
【表２】 [Table 2]
【００３０】表１，２に示すように、分離部のローラー
電位が１ＫＶあたりまでは効果は認められなかったが、
１ＫＶ（５００ＭΩの抵抗から）を越えてからは、分離
部のローラー１１の電位がプラス側に高いほど、剥離放
電跡のトナー像の乱れの程度は良くなった（すなわち、
トナー像の乱れ具合の程度が小さい）。また、分離部の
ローラー１１を１０００ＭΩの抵抗を介して接地した
時、転写バイアスローラー１３から転写搬送ベルト５へ
の印加電流を＋４０μＡに減らしても、転写印加電流が
＋５０μＡ時のトナー像の乱れの程度とほぼ同じにする
ことができた。また、トナー転写率は転写印加電流をよ
り適正値に近づけたことによって数％上昇した。As shown in Tables 1 and 2, no effect was observed when the roller potential of the separating portion was around 1 KV.
After the voltage exceeds 1 KV (from a resistance of 500 MΩ), the higher the potential of the roller 11 in the separation section is toward the positive side, the better the degree of the disturbance of the toner image on the trace of peeling discharge is (ie,
The degree of disorder of the toner image is small). Further, when the roller 11 of the separating portion is grounded through a resistance of 1000 MΩ, even if the applied current from the transfer bias roller 13 to the transfer conveyance belt 5 is reduced to +40 μA, the toner image is disturbed when the transfer applied current is +50 μA. It was able to be almost the same as the degree. Further, the toner transfer rate increased by several% as the transfer applied current was brought closer to an appropriate value.
【００３１】尚、分離部のローラー１１の電位は３ＫＶ
を大きく越えることはなく、ほぼ３ＫＶで頭打ちとなっ
た。これは、放電量が増加しただけで、抵抗へ流れる電
流はあまり変わらなかったためである。また、静電容量
負荷を併用すれば、転写バイアス印加電源のＯＦＦ後、
転写材後端が転写搬送ベルト５から分離するまで、確実
に電荷を付与し、希望の電位差を維持することができ
る。The potential of the roller 11 in the separating section is 3 KV.
It did not exceed the maximum, and reached a peak at almost 3 KV. This is because the current flowing to the resistor did not change much even if the discharge amount increased. In addition, if a capacitance load is also used, after the transfer bias application power is turned off,
Until the trailing edge of the transfer material is separated from the transfer / conveying belt 5, it is possible to reliably apply the charge and maintain a desired potential difference.
【００３２】[0032]
【発明の効果】以上説明したように、請求項１記載の画
像形成装置では、ベルトからの転写材分離部のベルト支
持部材の少なくとも一部に転写バイアスと同極性の電荷
を付与しているので、通常では放電は発生しないような
小さなギャップにおいても、放電が発生するようにな
る。そのため、剥離放電の衝撃を小さくして、トナー像
の乱れ具合の程度を小さくすることができる。また、転
写電流を適正値に近づけられるので、トナー転写率を上
げることができ、分離後の転写材除電部材を特に設ける
必要がない。As described above, in the image forming apparatus according to the first aspect, at least a part of the belt supporting member of the transfer material separating portion from the belt is provided with the electric charge having the same polarity as the transfer bias. However, discharge is generated even in a small gap where discharge does not normally occur. Therefore, the impact of the peeling discharge can be reduced, and the degree of disorder of the toner image can be reduced. Further, since the transfer current can be brought close to an appropriate value, the toner transfer rate can be increased, and it is not necessary to particularly provide a transfer material charge eliminating member after separation.
【００３３】請求項２記載の画像形成装置では、ベルト
からの転写材分離部のベルト支持部材の少なくとも一部
が抵抗を介して接地しているので、通常では放電は発生
しないような小さなギャップにおいても、放電が発生す
るようになる。そのため、剥離放電の衝撃を小さくし
て、トナー像の乱れ具合の程度を小さくすることができ
る。また、転写電流を適正値に近づけられるので、トナ
ー転写率を上げることができ、分離後の転写材除電部材
を特に設ける必要がない。In the image forming apparatus according to the second aspect, at least a part of the belt supporting member of the transfer material separating portion from the belt is grounded through the resistor, so that in a small gap where discharge does not normally occur. Also, a discharge will occur. Therefore, the impact of the peeling discharge can be reduced, and the degree of disorder of the toner image can be reduced. Further, since the transfer current can be brought close to an appropriate value, the toner transfer rate can be increased, and it is not necessary to particularly provide a transfer material charge eliminating member after separation.
【図１】本発明の一実施例を示す画像形成装置の概略構
成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus showing one embodiment of the present invention.
【図２】図１に示す画像形成装置の転写部及び転写材分
離部の構成及び動作の説明図である。FIG. 2 is an explanatory diagram of a configuration and an operation of a transfer unit and a transfer material separating unit of the image forming apparatus shown in FIG.
【図３】本発明の別の実施例を示す図であって、画像形
成装置の転写部及び転写材分離部の構成及び動作の説明
図である。FIG. 3 is a diagram showing another embodiment of the present invention, and is an explanatory diagram of a configuration and an operation of a transfer unit and a transfer material separating unit of the image forming apparatus.
【図４】転写搬送ベルトを用いた画像形成装置で転写材
分離部のローラーが接地されている場合の転写材分離時
の剥離放電の説明図である。FIG. 4 is an explanatory diagram of peeling discharge during transfer material separation when a roller of a transfer material separation unit is grounded in an image forming apparatus using a transfer / transport belt.
１ 感光体ドラム（像担持体） ２ 帯電装置 ３ 潜像形成手段（露光装置、光書込装置等） ４ 現像装置 ５ 転写搬送ベルト ６ クリーニング装置 ７ 除電装置 ８ 定着装置 ９ 転写前除電装置 １０ レジストローラー １１ 駆動ローラー １２ 従動ローラー １３ 転写バイアスローラー １４ クリーニング手段 １５ 転写バイアス印加電源 １６ 電源（転写バイアスと同極性の電荷を付与す
る手段） １７ 抵抗 Ｓ 転写材DESCRIPTION OF SYMBOLS 1 Photoconductor drum (image carrier) 2 Charging device 3 Latent image forming means (exposure device, optical writing device, etc.) 4 Developing device 5 Transfer / conveying belt 6 Cleaning device 7 Static eliminator 8 Fixing device 9 Pre-transfer static eliminator 10 Resist Roller 11 Drive roller 12 Driven roller 13 Transfer bias roller 14 Cleaning means 15 Transfer bias applying power supply 16 Power supply (means for applying charge of the same polarity as the transfer bias) 17 Resistance S Transfer material
Claims (2)
のニップ部で転写材を挾持搬送して像担持体上に形成さ
れたトナー像を転写材に静電的に転写させ、転写後の転
写材を像担持体から分離して定着部に向けて搬送する転
写搬送ベルトを転写手段に用いた画像形成装置であっ
て、 前記転写搬送ベルトからの転写材分離部において転写搬
送ベルトが持つ電荷がベルト支持部材の少なくとも一部
に漏洩する場合に、転写搬送ベルトからの転写材分離部
のベルト裏面側に位置するベルト支持部材の少なくとも
一部に転写バイアスと同極性の電荷を付与する手段を備
えたことを特徴とする画像形成装置。1. A transfer material is sandwiched and conveyed at a nip portion between the image carrier and an image carrier, and the toner image formed on the image carrier is electrostatically transferred to the transfer material. An image forming apparatus using, as a transfer unit, a transfer conveyance belt that separates a transfer material after transfer from an image carrier and conveys the transfer material toward a fixing unit, wherein transfer conveyance is performed in a transfer material separation unit from the transfer conveyance belt. When the electric charge of the belt leaks to at least a part of the belt supporting member, the electric charge having the same polarity as the transfer bias is applied to at least a part of the belt supporting member located on the belt back surface side of the transfer material separating portion from the transfer conveying belt. An image forming apparatus comprising: a means for giving.
のニップ部で転写材を挾持搬送して像担持体上に形成さ
れたトナー像を転写材に静電的に転写させ、転写後の転
写材を像担持体から分離して定着部に向けて搬送する転
写搬送ベルトを転写手段に用いた画像形成装置であっ
て、 前記転写搬送ベルトからの転写材分離部において転写搬
送ベルトが持つ電荷がベルト支持部材の少なくとも一部
に漏洩する場合に、転写搬送ベルトからの転写材分離部
のベルト裏面側に位置するベルト支持部材の少なくとも
一部が抵抗を介して接地していることを特徴とする画像
形成装置。2. A transfer material is sandwiched and conveyed at a nip portion between the image carrier and the image carrier so as to electrostatically transfer the toner image formed on the image carrier to the transfer material. An image forming apparatus using, as a transfer unit, a transfer conveyance belt that separates a transfer material after transfer from an image carrier and conveys the transfer material toward a fixing unit, wherein transfer conveyance is performed in a transfer material separation unit from the transfer conveyance belt. When the electric charge of the belt leaks to at least a part of the belt supporting member, at least a part of the belt supporting member located on the back surface side of the transfer material separating portion from the transfer / conveying belt is grounded through a resistor. An image forming apparatus characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29280195A JPH09134082A (en) | 1995-11-10 | 1995-11-10 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29280195A JPH09134082A (en) | 1995-11-10 | 1995-11-10 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09134082A true JPH09134082A (en) | 1997-05-20 |
Family
ID=17786528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29280195A Pending JPH09134082A (en) | 1995-11-10 | 1995-11-10 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09134082A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862422B2 (en) | 2003-02-12 | 2005-03-01 | Kabushiki Kaisha Toshiba | Image forming apparatus and image forming method having pressing members for pressing a belt-like member |
| JP2007298768A (en) * | 2006-04-28 | 2007-11-15 | Canon Inc | Image forming apparatus |
| JP2008046407A (en) * | 2006-08-17 | 2008-02-28 | Brother Ind Ltd | Image forming apparatus |
| EP1300734A3 (en) * | 2001-10-04 | 2009-10-28 | Ricoh Company, Ltd. | Transfer device capable of setting suitable recording medium adsorbing bias, and image forming apparatus including the transfer device |
| 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 |
| 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 |
| JP2016012041A (en) * | 2014-06-30 | 2016-01-21 | 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 apparatus |
| JP2016161693A (en) * | 2015-02-27 | 2016-09-05 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| JP2016161692A (en) * | 2015-02-27 | 2016-09-05 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| CN105929650A (en) * | 2015-02-27 | 2016-09-07 | 京瓷办公信息***株式会社 | Image forming apparatus that restrains scattered toner particles |
| CN105929659A (en) * | 2015-02-27 | 2016-09-07 | 京瓷办公信息***株式会社 | Image forming apparatus |
-
1995
- 1995-11-10 JP JP29280195A patent/JPH09134082A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1300734A3 (en) * | 2001-10-04 | 2009-10-28 | Ricoh Company, Ltd. | Transfer device capable of setting suitable recording medium adsorbing bias, and image forming apparatus including the transfer device |
| US6862422B2 (en) | 2003-02-12 | 2005-03-01 | Kabushiki Kaisha Toshiba | Image forming apparatus and image forming method having pressing members for pressing a belt-like member |
| US6952552B2 (en) | 2003-02-12 | 2005-10-04 | Kabushiki Kaisha Toshiba | Image forming apparatus and method that applies different voltages to pressing members |
| 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 |
| JP2007298768A (en) * | 2006-04-28 | 2007-11-15 | Canon Inc | Image forming apparatus |
| JP2008046407A (en) * | 2006-08-17 | 2008-02-28 | Brother Ind Ltd | Image forming apparatus |
| CN105474106A (en) * | 2014-06-30 | 2016-04-06 | 京瓷办公信息***株式会社 | Transfer apparatus and image forming apparatus |
| JP2016012041A (en) * | 2014-06-30 | 2016-01-21 | 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 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 |
| JP2016161693A (en) * | 2015-02-27 | 2016-09-05 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| JP2016161692A (en) * | 2015-02-27 | 2016-09-05 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| CN105929650A (en) * | 2015-02-27 | 2016-09-07 | 京瓷办公信息***株式会社 | Image forming apparatus that restrains scattered toner particles |
| CN105929659A (en) * | 2015-02-27 | 2016-09-07 | 京瓷办公信息***株式会社 | Image forming apparatus |
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