JPH06342243A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH06342243A JPH06342243A JP5152645A JP15264593A JPH06342243A JP H06342243 A JPH06342243 A JP H06342243A JP 5152645 A JP5152645 A JP 5152645A JP 15264593 A JP15264593 A JP 15264593A JP H06342243 A JPH06342243 A JP H06342243A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- base body
- image
- transfer material
- image forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、静電複写機、同プリ
ンタ等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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using an electrostatic transfer process such as an electrostatic copying machine and a printer.
【０００２】[0002]
【従来技術と解決すべき課題】この種の画像形成装置に
おいて、同一の転写材に複数色のトナー像を順次重畳形
成する工程を含む画像形成装置がすでに幾多提案されて
いる。2. Description of the Related Art In this type of image forming apparatus, a number of image forming apparatuses including a step of sequentially superposing toner images of a plurality of colors on the same transfer material have been proposed.
【０００３】「図５」はこのような画像形成装置野一例
を略示する側面図であり、これについて以下に略述す
る。画像形成装置本体内には図示矢印Ｘ方向に走行する
無端ベルト８が配設してある。該ベルト８は、ポリエチ
レンテレフタレート樹脂フィルム、ポリフッ化ビニリデ
ン樹脂フィルム等のような誘電体樹脂からなっているも
のとし、カセット６０から取り出された転写材６が、レ
ジストローラ１３を経て前記ベルト８に供給され、さら
に図示左方に搬送される。FIG. 5 is a side view schematically showing an example of such an image forming apparatus, which will be briefly described below. An endless belt 8 that travels in the direction of the arrow X in the drawing is provided in the main body of the image forming apparatus. The belt 8 is made of a dielectric resin such as a polyethylene terephthalate resin film or a polyvinylidene fluoride resin film, and the transfer material 6 taken out from the cassette 60 is supplied to the belt 8 via the resist roller 13. And further conveyed to the left in the drawing.
【０００４】前記無端ベルト８の上面には、図示の場
合、基本的に同様の構成を具備する４個の画像形成部Ｐ
ａ、Ｐｂ、Ｐｃ、Ｐｄが直列状に配置してあり、その内
部の構成は画像形成部Ｐａのみについて示してあって、
その他の画像形成部については省略してある。On the upper surface of the endless belt 8, four image forming portions P having basically the same structure as shown in the figure are provided.
a, Pb, Pc, and Pd are arranged in series, and the internal configuration is shown only for the image forming portion Pa.
The other image forming units are omitted.
【０００５】各画像形成部Ｐａ乃至Ｐｄはすべて同様の
構成をそなえているので、画像形成部Ｐａについて略述
する。画像形成部Ｐａは回転円筒状の像担持体１ａをそ
なえ、その周辺には一次帯電器２ａ、現像機３ａ、クリ
ーナ５ａ等の画像形成部材を具備している。画像形成部
Ｐｂ等もこれと同様の構成をそなえており、図には像担
持体１ｂ、１ｃ、１ｄのみが示してある。各画像形成部
に配置した現像器にはそれぞれマゼンタトナー、シアン
トナー、イエロートナー及びブラックトナーが収納され
ているものとする。Since each of the image forming portions Pa to Pd has the same structure, the image forming portion Pa will be briefly described. The image forming portion Pa has a rotating cylindrical image carrier 1a, and is provided with an image forming member such as a primary charger 2a, a developing device 3a and a cleaner 5a around the image carrier 1a. The image forming portion Pb and the like have the same configuration as this, and only the image carriers 1b, 1c, and 1d are shown in the drawing. It is assumed that magenta toner, cyan toner, yellow toner, and black toner are stored in the developing devices arranged in the respective image forming units.
【０００６】原稿のマゼンタ成分色による画像信号がポ
リゴンミラー１７等を介して像担持体１ａ上に投射され
て静電潜像が形成され、これに現像器３ａからマゼンタ
トナーが供給されて前記潜像がマゼンタトナー像とな
る。このトナー像が像担持体１ａの回転につれて、像担
持体１ａと無端ベルト８とが当接する転写部位に到来す
ると、このときまでに、カセット６０から取り出された
転写材６が前記転写部位に達し、転写手段４ａによって
印加される転写バイアスによって前記マゼンタトナー像
は転写材に転移する。その後像担持体に残る残留トナー
はクリーナ５ａによって除去され、さらに残留電荷が前
露光手段２１ａによって除去されて像担持体はつぎの画
像形成が可能な状態になる。An image signal based on the magenta component color of the original is projected onto the image carrier 1a via the polygon mirror 17 and the like to form an electrostatic latent image, on which magenta toner is supplied from the developing device 3a to form the latent image. The image becomes a magenta toner image. When this toner image arrives at the transfer site where the image carrier 1a and the endless belt 8 contact as the image carrier 1a rotates, the transfer material 6 taken out from the cassette 60 reaches the transfer site by this time. The magenta toner image is transferred to the transfer material by the transfer bias applied by the transfer means 4a. After that, the residual toner remaining on the image carrier is removed by the cleaner 5a, and the residual charges are removed by the pre-exposure means 21a, so that the image carrier is ready for the next image formation.
【０００７】マゼンタトナー像を担持した転写材がベル
ト８によって、画像形成部Ｐｂに搬送されると、この時
までに画像形成部Ｐｂにおいて、前記と同様の仕方で像
担持体１ｂ上に形成されたシアントナー像が転写材に転
写される。When the transfer material carrying the magenta toner image is conveyed to the image forming portion Pb by the belt 8, by this time, the image forming portion Pb forms the transfer material on the image bearing member 1b in the same manner as described above. The cyan toner image is transferred to the transfer material.
【０００８】同様に、転写材が画像形成部Ｐｃ、Ｐｄに
進行するにつれて、それぞれの転写部位においてイエロ
ートナー像、ブラックトナー像が前記のトナー像に重畳
転写された後、このトナー像を担持する転写材はベルト
８から分離されて定着装置７に搬送される。 該定着装
置７には、定着ローラ７１とこれに圧接する加圧ローラ
７２が配設してあり、前記転写材はこれらローラのニッ
プ部に送給されて加圧、加熱されてカラー像が定着固定
されて機外に排出される。Similarly, as the transfer material advances to the image forming portions Pc and Pd, the yellow toner image and the black toner image are superposed and transferred on the toner images at the respective transfer portions, and thereafter, the toner images are carried. The transfer material is separated from the belt 8 and conveyed to the fixing device 7. The fixing device 7 is provided with a fixing roller 71 and a pressure roller 72 that is in pressure contact with the fixing roller 71. The transfer material is fed to the nip portion of these rollers to be pressed and heated to fix a color image. It is fixed and discharged to the outside of the machine.
【０００９】その後搬送ベルト８の帰路に相当する部位
には、除電帯電器１２、クリーニング用ファーブラシ１
６が配設してあって、ベルトの電荷、これに付着したト
ナー等を除去するものとする。After that, a static eliminator 12 and a cleaning fur brush 1 are provided at the portion corresponding to the return path of the conveyor belt 8.
6 is provided to remove the electric charge of the belt and the toner and the like adhering to it.
【００１０】「図６」は他の構成のカラー画像形成装置
を示す概略側面図である。この装置においては、カセッ
ト６０から取り出された転写材６は、レジストローラ１
３を経て表面を誘電体材料で形成した転写ドラム８０に
供給される。転写材が転写ドラム８０に到達したところ
で、吸着用帯電部材と対向電極からなる吸着手段によっ
て転写材は転写ドラムに吸着固定されて、これとともに
回転走行する。FIG. 6 is a schematic side view showing a color image forming apparatus having another structure. In this apparatus, the transfer material 6 taken out from the cassette 60 is the registration roller 1
3 is supplied to a transfer drum 80 whose surface is made of a dielectric material. When the transfer material reaches the transfer drum 80, the transfer material is adsorbed and fixed on the transfer drum by the adsorbing means composed of the adsorbing charging member and the counter electrode, and rotates and runs together with the transfer material.
【００１１】一方、原稿から得られたシアン成分色によ
る画像信号が、一次帯電器２によって一様に帯電された
像担持体表面に投射されて静電潜像が形成され、該潜像
が像担持体１とシアントナーを収納した現像器３ａが対
向する現像部位に達すると該現像器３ａからシアントナ
ーが付与されてシアントナー像が形成される。On the other hand, the image signal of the cyan component color obtained from the original is projected on the surface of the image carrier uniformly charged by the primary charger 2 to form an electrostatic latent image, and the latent image is formed as an image. When the carrier 1 and the developing device 3a accommodating the cyan toner reach a developing portion facing each other, the cyan toner is applied from the developing device 3a to form a cyan toner image.
【００１２】このシアントナー像が、像担持体１と転写
ドラム８０とが対向する転写部位に達すると、これ似タ
イミングを合わせるように該転写部位に転写材が到来
し、転写部材８０の内側に配設された帯電部材４の作用
で、像担持体側のシアントナー像は転写材に転移する。When the cyan toner image reaches a transfer portion where the image carrier 1 and the transfer drum 80 face each other, the transfer material arrives at the transfer portion so that the similar timing is adjusted, and the transfer material enters the inside of the transfer member 80. By the action of the charging member 4 provided, the cyan toner image on the image carrier side is transferred to the transfer material.
【００１３】その後、転写材は転写ドラム８０に載置さ
れたまま回転走行して、再び前記転写部位に達するが、
このときまでに、対向する像担持体１上にはマゼンタト
ナーを収納した現像器３ｂが現像部位に回動してきてこ
れによってマゼンタトナー像が形成され、このトナー像
がさらに前記転写部位に到達しているので、転写ドラム
上の転写材にはマゼンタトナー像が重畳転写される。After that, the transfer material is rotated while traveling on the transfer drum 80 and reaches the transfer portion again.
By this time, the developing device 3b containing magenta toner on the opposing image carrier 1 has rotated to the developing portion to form a magenta toner image, and this toner image further reaches the transfer portion. Therefore, the magenta toner image is superposed and transferred onto the transfer material on the transfer drum.
【００１４】以後、同様に転写材には現像器３ｃによっ
てイエロートナー像が、現像器３ｄによってブラックト
ナー像が順次転写されて転写工程が終了する。Thereafter, similarly, the yellow toner image and the black toner image are sequentially transferred to the transfer material by the developing device 3c and the developing device 3d, respectively, and the transfer process is completed.
【００１５】転写を終了した転写材は、徐電帯電器１
４、１５によって徐電されて転写ドラム８０から分離さ
れて、定着ローラ７１、加圧ローラ７２をそなえた定着
装置７に至り、各色トナーが定着されてカラー画像が形
成されて機外に排出される。After the transfer, the transfer material is the slow-charged charger 1.
The toner is gradually discharged by 4, 15 and separated from the transfer drum 80, and reaches a fixing device 7 having a fixing roller 71 and a pressure roller 72, where each color toner is fixed and a color image is formed and discharged to the outside of the apparatus. It
【００１６】このような画像形成装置において、像担持
体上のトナー像を良好な状態で転写材に転写するために
は、転写電界を規制し、トナーの飛散が生じないように
することが肝要である。また、転写手段として、転写材
の厚み、材質、含水率などによって高インピーダンス時
には転写電流が減少するコロナ放電器のような非接触型
のもの、転写ローラ、転写ブラシのような定電圧制御の
接触型の転写手段などは、転写時の抵抗値を予め測定な
いしは推定しておくための制御手段を必要とする。In such an image forming apparatus, in order to transfer the toner image on the image carrier to the transfer material in a good state, it is important to regulate the transfer electric field so that the toner is not scattered. Is. In addition, as a transfer means, a non-contact type such as a corona discharger whose transfer current decreases when the impedance is high due to the thickness, material, water content, etc. of the transfer material, a contact for constant voltage control such as a transfer roller or a transfer brush The mold transfer means or the like requires a control means for measuring or estimating the resistance value during transfer in advance.
【００１７】このような観点から云うと、転写手段とし
ては、導電性のブレードをもちいるのが、転写電界を適
正範囲に規制し、定電流制御が容易であって好適といえ
る。即ち、転写手段としてのブレード状のものと、ロー
ラ状のものを考えると、前者のほうが、転写材ないしは
転写材担持体と接触している部分と然らざる部分との境
界がはっきりしているので電界の規制が容易である。ま
た、転写ローラ等には導電性ゴム、スポンジ、金属等が
利用されるが、これを転写材、像担持体ないしは転写材
担持体方向に押圧する際、押圧が強過ぎるとトナーが強
圧されて転写材に転移せずに転写不良を生ずるおそれが
ある前者の場合このような問題を回避し易い。また、製
作精度が出し易い点からもブレードタイプのものが好ま
しいと云える。From this point of view, it is preferable to use a conductive blade as the transfer means because the transfer electric field is regulated within an appropriate range and constant current control is easy. That is, considering a blade-shaped transfer means and a roller-shaped transfer means, the former has a clearer boundary between a portion in contact with the transfer material or the transfer material carrier and an undesired portion. Therefore, it is easy to regulate the electric field. Further, conductive rubber, sponge, metal, etc. are used for the transfer roller, etc., but when pressing this toward the transfer material, the image carrier or the transfer material carrier, if the pressure is too strong, the toner is strongly pressed. In the former case where transfer failure may occur without transfer to the transfer material, such a problem is easily avoided. In addition, it can be said that the blade type is preferable in terms of easy production accuracy.
【００１８】併しながら、通常導電性ゴムからなるこの
ようなブレードタイプの転写手段は、これが転写材ない
しは転写材担持体等と当接摺擦するので摩耗か顕著であ
ると云う問題があった。ブレードの摩耗が増大すると、
像担持体等との間の摩擦が増して、前記のような画像形
成装置の場合、ブレードと転写材搬送ベルトの当接ニッ
プ部が該ベルトの走行方向下流側に移動したり、あるい
はブレード長が短くなってニップ部が上流側に移動した
りして、所定位置での転写が出来ず、像担持体と転写手
段に間に異常放電を発生したり、電界不足を来して転写
不良を発生するおそれがある。At the same time, however, such a blade type transfer means, which is usually made of conductive rubber, has a problem that it is significantly worn because it abuts against the transfer material or the transfer material carrier. . As the blade wear increases,
In the case of the image forming apparatus as described above due to increased friction between the image carrier and the like, the contact nip portion between the blade and the transfer material transport belt moves to the downstream side in the running direction of the belt, or the blade length. Becomes shorter and the nip part moves to the upstream side, transfer at a predetermined position cannot be performed, abnormal discharge occurs between the image carrier and the transfer unit, or a shortage of an electric field causes a transfer failure. It may occur.
【００１９】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、転写手段として導電性ブレードを用
いる場合、その像担持体等との間の摩擦を可及的に小さ
く維持するとともに、それへの押圧作用を規制して不適
切な撓みや貼り付きを防止して、常時安定した転写、帯
電を行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 to cope with such a situation, and when a conductive blade is used as the transfer means, the friction between the conductive blade and the image carrier is kept as small as possible. An object of the present invention is to provide an image forming apparatus capable of constantly performing stable transfer and charging by restricting the pressing action on it to prevent improper bending and sticking.
【００２０】[0020]
【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、像担持体と、これに当接擦る転
写材担持体とを備え、該転写材担持体を介して像担持体
に対向する導電性基体を有する帯電部材を備えた画像形
成装置において、前記導電性基体の一方側に、これを前
記転写材担持体方向への圧接作用を調整する押圧部材を
配設してなるか、または、このものにおいて、基体と押
圧部材の間に潤滑部材を配設してなるか、または、基体
の体積抵抗率を１０2 〜１０8 Ωｃｍの範囲に調整した
ことを特徴とするものである。In order to achieve the above-mentioned object, the present invention comprises an image carrier and a transfer material carrier which contacts and rubs against the image carrier, and an image is transferred via the transfer material carrier. In an image forming apparatus provided with a charging member having a conductive substrate facing a carrier, a pressing member for adjusting the pressure contact action of the conductive substrate toward the transfer material carrier is disposed on one side of the conductive substrate. Or a lubricant is provided between the base and the pressing member, or the volume resistivity of the base is adjusted to a range of 10 2 to 10 8 Ωcm. To do.
【００２１】こ個のように構成することによって、転写
ニツプ部の位置を安定化するとともに、当接圧を軽圧化
することが可能となる。With this configuration, the position of the transfer nip portion can be stabilized and the contact pressure can be reduced.
【００２２】[0022]
【実施例の説明】「図１」は本発明の実施態様を示す転
写、帯電手段を示す側面図、「図２」は要部斜視図であ
る。該手段は「図２」に示すように、長方形板状の導電
性ゴムからなる基体４０１と、その長手方向に高導電性
材料からなる電極４０２を導電性接着剤４０６によって
接合した帯電部材を具備している。該基体４０１が像担
持体乃至転写材担持体に当接する側の端縁には、基体４
０１よりも低摩擦係数の表層４０５が塗布形成してあ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS "FIG. 1" is a side view showing a transfer / charging means showing an embodiment of the present invention, and "FIG. 2" is a perspective view of an essential part. As shown in FIG. 2, the means includes a charging member in which a base 401 made of a conductive rubber in the shape of a rectangular plate and an electrode 402 made of a highly conductive material are joined in the longitudinal direction by a conductive adhesive 406. is doing. At the edge of the side where the base 401 abuts the image carrier or the transfer material carrier, the base 4
The surface layer 405 having a friction coefficient lower than 01 is formed by coating.
【００２３】「図１」はこのような基体を備えた帯電部
材を、前記「図５」に示すような画像形成装置の転写部
位に配設したところを示す断面図で、図示の場合、基体
４０１の下流側（転写材搬送方向にみて）に押圧部材４
０４を近接配置して、基体４０１全長にわたってベルト
８に均一な押圧力が得られるようにしてある。FIG. 1 is a sectional view showing a charging member provided with such a substrate, which is disposed at a transfer portion of the image forming apparatus as shown in FIG. The pressing member 4 is provided on the downstream side of the 401 (as viewed in the transfer material conveying direction).
04 are arranged close to each other so that a uniform pressing force can be obtained on the belt 8 over the entire length of the base 401.
【００２４】前記基体４０１の材料としては、イソプレ
ンゴム、スチレンゴム、ブタジェンゴム、ニトリルゴ
ム、エチレンプロピレンゴム、ブチルゴム、シリコンゴ
ム、クロロプレンゴム、クロロスルホン化ポリエチレ
ン、アクリルゴム、ヒドリンゴム、ウレタンゴム、フッ
素ゴムなどのゴム類、これらを合成した合成ゴムあるい
はナイロン、ウレタンねポリエステル等の合成樹脂に、
酸化スズ、カーボンブラックなどを分散して適度の体積
抵抗率となるように調整したものを利用できる。この場
合の導電性ゴム基体４０１の体積低効率は１０2 〜１０
8 Ωｃｍ程度とするのが好適である。The material of the base 401 is isoprene rubber, styrene rubber, butadiene rubber, nitrile rubber, ethylene propylene rubber, butyl rubber, silicon rubber, chloroprene rubber, chlorosulfonated polyethylene, acrylic rubber, hydrin rubber, urethane rubber, fluororubber, etc. Rubbers, synthetic rubbers made from these, or synthetic resins such as nylon and urethane
A material prepared by dispersing tin oxide, carbon black or the like so as to have an appropriate volume resistivity can be used. In this case, the low volume efficiency of the conductive rubber substrate 401 is 10 2 to 10
It is preferably about 8 Ωcm.
【００２５】ところで、このような構成の帯電手段を被
帯電部材に摺動させる場合には、その長手方向における
局部的な帯電ムラの発生が問題となる。その原因として
は、帯電手段の当接ムラがあげられるが、この当接ムラ
は、当初からの当接精度による場合と、当接部位に異物
が停滞介在する場合、さらに長期の使用によって当接部
位における双方または一方の摩耗、損傷による場合など
が考えられる。By the way, when the charging means having such a structure is slid on the member to be charged, the occurrence of local uneven charging in the longitudinal direction becomes a problem. The cause of this is uneven contact of the charging means.This uneven contact is caused by the contact accuracy from the beginning and when foreign matter is stagnant at the contact site, and the contact is caused by longer-term use. It is possible that both or one of the parts is worn or damaged.
【００２６】また、このような帯電部材を用いて転写を
行う場合、記「図５」に示したように、帯電部材と被帯
電部材との間に誘電体層が存在する場合と、周知のモノ
クロタイプの画像形成装置にみられるように、被帯電部
材たる転写材に帯電部材が直接当接する場合があり、前
者の場合の方が帯電のバラ付きが抑えられることが判明
している。When transfer is performed using such a charging member, as shown in "FIG. 5", there is a dielectric layer between the charging member and the member to be charged, which is well known. As seen in the monochrome type image forming apparatus, the charging member may come into direct contact with the transfer material, which is the member to be charged, and it has been found that the former case can suppress variation in charging.
【００２７】然しながら上記前者の場合でも、帯電部材
の基体４０１の硬度によって帯電ケラの発生に変化があ
り、以下これについて略述する。However, even in the former case, the occurrence of charging eclipse varies depending on the hardness of the base member 401 of the charging member, which will be briefly described below.
【００２８】基体の材料としてエピクロルヒドリンゴム
にカーボンブラックを混入して表面抵抗値を１０9 Ωに
調整したもので、硬度（ＪＩＳ Ａ）５０、６０、７
０、８０、９０度と５種類の基体を形成し、表面にフッ
化カーボン粉末をナイロンに分散した塗布層を設けて、
「図３」に示すような帯電部材を構成し、これを前記
「図５」に示すような画像形成装置に装着して通紙を行
った。Carbon black is mixed with epichlorohydrin rubber as the material of the substrate to adjust the surface resistance value to 10 9 Ω, and hardness (JIS A) 50, 60, 7
Five kinds of bases of 0, 80, 90 degrees are formed, and a coating layer in which carbon fluoride powder is dispersed in nylon is provided on the surface,
A charging member as shown in "FIG. 3" was constructed, and this was mounted on the image forming apparatus as shown in "FIG. 5", and paper was passed.
【００２９】この場合、２３。Ｃ、５％ＲＨの環境下で
は、硬度６０度では帯電ムラはなく良好な転写が行われ
たが、７０度、８０度の順にスジ状の帯電ムラの発生が
みられた。In this case, 23. Under an environment of C and 5% RH, good transfer was performed without uneven charging at a hardness of 60 degrees, but streaky uneven charging was observed in the order of 70 degrees and 80 degrees.
【００３０】また、２３。Ｃ、６０％ＲＨの環境下では
すべての帯電部材で良好な転写画像が得られたが、硬度
９０度のものでは被帯電部材に当接傷を与えるなど物理
的な欠陥が現れた。Also, 23. Under the environment of C and 60% RH, good transferred images were obtained on all the charged members, but when the hardness was 90 degrees, physical defects such as contact damage to the charged member appeared.
【００３１】また、以上のような帯電部材を像担持体乃
至転写材担持体に圧接する際の圧接力が強過ぎると２〜
４本程度の線画を転写する際に像担持体側のトナーが転
移しない、中抜け画像が、とくに転写材搬送方向に延び
る線画について生じやすい。反対に圧接力を弱くした場
合には、ゴム硬度の低いものを用いるのが好適であった
が、この種の導電性ゴムは硬度が低くなると摩擦抵抗が
上がる傾向がある。この対策として、「図１」等に符号
４０４で示すように基体４０２の下流側に押圧部材４０
４を配設して、基体の撓みを調整するとよい。If the above-mentioned charging member is pressed against the image bearing member or the transfer material bearing member, if the pressure contact force is too strong, 2 to
A hollow image, in which toner on the image carrier side does not transfer when transferring about four line images, is likely to occur particularly in line images extending in the transfer material transport direction. On the contrary, when the pressure contact force is weakened, it is preferable to use a rubber having a low rubber hardness, but this type of conductive rubber tends to have an increased frictional resistance when the hardness becomes low. As a measure against this, as shown by reference numeral 404 in FIG.
4 may be provided to adjust the bending of the base body.
【００３２】また、「図５」に示すような画像形成装置
においては、像担持体側の帯電メモリーの抑制のため、
トナー濃度の制御、像担持体の表面電位制御などのため
に適宜のパターンを像担持体上に形成し、これを不図示
の高額センサ等で読み取ってフィードバック制御を行っ
たり、転写材の搬送不良の処理などの場合、像担持体あ
るいは転写材担持体と帯電部材とを離隔することがあ
る。Further, in the image forming apparatus as shown in FIG. 5, in order to suppress the charging memory on the image carrier side,
An appropriate pattern is formed on the image carrier for controlling the toner density, surface potential of the image carrier, etc., and this is read by an expensive sensor (not shown) to perform feedback control, or the transfer material is not conveyed properly. In the case of the above processing, the image bearing member or the transfer material bearing member may be separated from the charging member.
【００３３】このような場合、前記のように基体４０１
の撓み調整のための押圧部材４０４とが円滑に摺動しな
いと、以後撓みが不適正となったり、転写ニップ位置が
変化して転写不良を生ずるようなことがある。このよう
な問題を回避すべく、「図１」、「図４」に符号４０７
で示すように、基体４０１と押圧部材４０４との間に潤
滑部材を配設するのが好適である。潤滑部材の材料とし
ては、テフロン、オイルペーパ、剥離紙など適宜の低摩
擦部材を利用することができ、また、シリコンオイルな
どを塗布してもよい。In such a case, as described above, the substrate 401
If the pressing member 404 for adjusting the flexure does not slide smoothly, the flexure may become improper thereafter, or the transfer nip position may change to cause transfer failure. In order to avoid such a problem, reference numeral 407 is added to “FIG. 1” and “FIG. 4”.
It is preferable to dispose a lubricating member between the base 401 and the pressing member 404, as shown in FIG. As a material for the lubricating member, an appropriate low-friction member such as Teflon, oil paper, release paper can be used, and silicone oil or the like may be applied.
【００３４】以上本発明を、複数個の現像器をそなえた
画像形成装置に適用した場合の実施例について説明した
が、本発明はこれに限定されるものではなく、たとえ
ば、単一の像担持体、現像器を備え、該像担持体に当接
配置した無端ベルト状の転写材搬送手段を備えたモノク
ロタイプの画像形成装置などにも適用できることは容易
に理解できるところであろう。Although the present invention has been described with reference to an embodiment in which the present invention is applied to an image forming apparatus having a plurality of developing devices, the present invention is not limited to this. For example, a single image carrier is carried. It can be easily understood that the present invention can also be applied to a monochrome type image forming apparatus including a body and a developing device, and an endless belt-like transfer material conveying unit disposed in contact with the image carrier.
【００３５】[0035]
【発明の効果】以上説明したように、本発明によるとき
は、像担持体に転写材を担持する転写材担持体を当接し
願い転写材担持体を介して帯電部材をこれに圧接するよ
うにし、該帯電部材に導電性ブレードを用いた画像形成
装置において、前記帯電部材の一面に押圧部材を設け、
さらに必要に応じてこれら両者の間に潤滑部材を配設す
ることによって、転写ニツプ部位の安定化、軽圧化をは
かり得るので良質の画像を得るのに顕著な効果がある。As described above, according to the present invention, the transfer material carrier carrying the transfer material is brought into contact with the image carrier, and the charging member is pressed against the transfer material carrier via the desired transfer material carrier. In an image forming apparatus using a conductive blade for the charging member, a pressing member is provided on one surface of the charging member,
Further, by disposing a lubricating member between the two, if necessary, it is possible to stabilize the transfer nip portion and reduce the pressure, which is a remarkable effect in obtaining a high quality image.
【図１】本発明の実施例を示す帯電部材の側面図FIG. 1 is a side view of a charging member showing an embodiment of the present invention.
【図２】同上導電性ゴムからなる基体の斜視図FIG. 2 is a perspective view of a base body made of conductive rubber.
【図３】及びFIG. 3 and
【図４】それぞれ帯電部材の他の実施例を示す側面図FIG. 4 is a side view showing another embodiment of the charging member.
【図５】本発明を適用するに適したカラー画像形成装置
の概略側面図FIG. 5 is a schematic side view of a color image forming apparatus suitable for applying the present invention.
【図６】本発明を適用するに適した他の構成のカラー画
像形成装置FIG. 6 is a color image forming apparatus having another configuration suitable for applying the present invention.
４０１ 基体 ４０２ 電極 ４０５ 低摩擦表層 ４０６ 接着剤 ４０７ 押圧部材 401 Substrate 402 Electrode 405 Low Friction Surface Layer 406 Adhesive 407 Pressing Member
Claims (3)
とを備え、該転写材担持体を介して像担持体に対向する
導電性基体を有する帯電部材を備えた画像形成装置にお
いて、 前記導電性基体の一方側に、これを前記転写材担持体方
向への圧接作用を調整する押圧部材を配設してなる画像
形成装置。1. An image forming apparatus comprising: an image carrier; and a transfer material carrier that abuts against the image carrier, and a charging member having a conductive substrate facing the image carrier through the transfer material carrier. In the image forming apparatus, the conductive substrate is provided on one side with a pressing member that adjusts the pressure contact action of the conductive substrate toward the transfer material carrier.
なる「請求項１」記載の画像形成装置。2. An image forming apparatus according to claim 1, wherein a lubricating member is provided between the base and the pressing member.
の範囲に調整した「請求項１」または「請求項２」のい
ずれか記載の画像形成装置。3. The volume resistivity of the substrate is 10 2 to 10 8 Ωcm.
The image forming apparatus according to any one of "claim 1" and "claim 2" adjusted within the range.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15264593A JP3438057B2 (en) | 1993-06-01 | 1993-06-01 | Image forming device |
| US08/172,057 US5594538A (en) | 1992-12-29 | 1993-12-23 | Image forming apparatus having multi-layer transfer material bearing member with different coefficient of kinetic frictions between layers |
| DE69334044T DE69334044T2 (en) | 1992-12-29 | 1993-12-28 | Image forming apparatus with transfer material carrier |
| EP93121005A EP0604974B1 (en) | 1992-12-29 | 1993-12-28 | Image forming apparatus having transfer material bearing member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15264593A JP3438057B2 (en) | 1993-06-01 | 1993-06-01 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06342243A true JPH06342243A (en) | 1994-12-13 |
| JP3438057B2 JP3438057B2 (en) | 2003-08-18 |
Family
ID=15544944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15264593A Expired - Fee Related JP3438057B2 (en) | 1992-12-29 | 1993-06-01 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3438057B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7835678B2 (en) | 2005-11-11 | 2010-11-16 | Canon Kabushiki Kaisha | Image forming apparatus with swingable transfer members |
| JP2011158586A (en) * | 2010-01-29 | 2011-08-18 | Canon Inc | Image forming apparatus |
-
1993
- 1993-06-01 JP JP15264593A patent/JP3438057B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7835678B2 (en) | 2005-11-11 | 2010-11-16 | Canon Kabushiki Kaisha | Image forming apparatus with swingable transfer members |
| US8320805B2 (en) | 2005-11-11 | 2012-11-27 | Canon Kabushiki Kaisha | Image forming apparatus having transfer member supported by rotatable supporting member |
| US8532549B2 (en) | 2005-11-11 | 2013-09-10 | Canon Kabushiki Kaisha | Image forming apparatus featuring a rotatable supporting member for a transfer belt |
| US8594546B2 (en) | 2005-11-11 | 2013-11-26 | Canon Kabushiki Kaisha | Image forming apparatus |
| US9158237B2 (en) | 2005-11-11 | 2015-10-13 | Canon Kabushiki Kaisha | Image forming apparatus having movable endless belt supporting member |
| JP2011158586A (en) * | 2010-01-29 | 2011-08-18 | Canon Inc | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3438057B2 (en) | 2003-08-18 |
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