JPH07271204A - Transfer belt - Google Patents

Transfer belt

Info

Publication number
JPH07271204A
JPH07271204A JP6064992A JP6499294A JPH07271204A JP H07271204 A JPH07271204 A JP H07271204A JP 6064992 A JP6064992 A JP 6064992A JP 6499294 A JP6499294 A JP 6499294A JP H07271204 A JPH07271204 A JP H07271204A
Authority
JP
Japan
Prior art keywords
transfer belt
roller
belt
rubber
layer
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
Application number
JP6064992A
Other languages
Japanese (ja)
Inventor
Hideki Komatsu
秀樹 小松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6064992A priority Critical patent/JPH07271204A/en
Publication of JPH07271204A publication Critical patent/JPH07271204A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To suppress the variance of electrical resistance and the secular change thereof in a transfer belt by using hydrin rubber as the rubber material of the transfer belt. CONSTITUTION:A resist roller 16 is arranged in front of a photoreceptuve drum 1 and the transfer belt 2 is arranged to abut on the drum 1. The belt 2 is spread between a driving roller 3 and a driven roller 4. Then, the dual structure of an inside layer 2a consisting of the hydrin rubber being the rubber material whose electrical resistance is medium and a dielectric layer 2b made of urethane formed on the layer 2a as a surface layer is used for the belt 2. The roller 3 is formed by winding a rubber layer round the outside circumferential surface of a metallic roller in order to enhance friction coefficient between the belt 2. The roller 4 is constituted of the metallic roller. Then, a bias roller 5 is made to abut on A position the inside circumferential surface of the belt 2 at a prescribed distance away from a nip part 17 between the drum 1 and the belt 2.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、複写機、プリンタ
ー、ファクシミリ等の転写部に用いられ、像担持体のト
ナー画像を用紙に転写、あるいは用紙を搬送するための
転写ベルトに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer belt which is used in a transfer section of a copying machine, a printer, a facsimile or the like, for transferring a toner image on an image carrier to a sheet or for conveying the sheet.

【0002】[0002]

【従来の技術】一般に、複写機等の転写ベルト装置に使
用される転写ベルトは、用紙の搬送、用紙へのトナー画
像の転写、及び転写済み用紙の分離の作用を果たすもの
であり、従来の転写ベルト装置においては、転写ベルト
への帯電としてコロナ放電方式が多く用いられている。
しかし、最近ではバイアスローラ等で直接印加する方式
の転写ベルト装置(リコーFT550)があり、このよ
うな方式によれば、オゾン発生を従来の方式の1/10
から1/20の濃度へ低減することが可能となる。
2. Description of the Related Art Generally, a transfer belt used in a transfer belt device such as a copying machine serves to convey a sheet, transfer a toner image onto the sheet, and separate the sheet after the transfer. In the transfer belt device, a corona discharge method is often used for charging the transfer belt.
However, recently, there is a transfer belt device (Ricoh FT550) that directly applies a bias roller or the like. According to such a system, ozone generation is 1/10 of that of the conventional system.
It is possible to reduce the concentration to 1/20.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来の転写ベルトにおいては、前記直接印加方式を用いる
と、転写ベルトの内部を通して感光体に流れる電流によ
って転写が行われるので、コロナ放電を用いる方式に比
べて、転写ベルトの電気抵抗の変化が画像に与える影響
が大きくなる。つまり、転写ベルト内の抵抗のバラツキ
が大きい場合、感光体に流れる電流のバラツキも大きく
なるので、転写されたトナー画像には濃淡ムラが発生
し、また、経時変化によって抵抗値が高くなると、転写
電流が不足するようになり、白抜け画像が発生する。そ
の対策として、転写電流が一定になるように、電源の出
力電圧を適宜変化させて制御する方法があるが、転写ベ
ルト内の抵抗のバラツキが大きい場合、電源の出力電圧
の変化が抵抗値の変動に追い付かずに、一定の転写電流
が供給できなかったり、転写電流が不足したりするとい
う問題点があった。
However, in the above-mentioned conventional transfer belt, when the above-mentioned direct application method is used, transfer is performed by the current flowing through the inside of the transfer belt to the photosensitive member, so that the method using corona discharge is used. In comparison, the change in the electric resistance of the transfer belt has a greater effect on the image. In other words, when the resistance in the transfer belt varies greatly, the current flowing in the photoconductor also varies, so uneven density occurs in the transferred toner image, and when the resistance value increases with time, the transfer The current becomes insufficient and a blank image occurs. As a countermeasure, there is a method of controlling by appropriately changing the output voltage of the power supply so that the transfer current becomes constant.However, when the resistance in the transfer belt varies widely, the change in the output voltage of the power supply causes a change in the resistance value. There was a problem that a constant transfer current could not be supplied or the transfer current became insufficient without keeping up with the fluctuation.

【0004】また、EDPMをベースにした転写ベルト
は、中抵抗を得るためにゴムにカーボンを添加した材料
を用いているが、カーボン分散によって導電性を得てい
るゴムにおいては、カーボンのストラクチャー状態が電
気抵抗に大きく影響し、1本の転写ベルトの中でカーボ
ンストラクチャーの分散が均一でない場合、転写ベルト
の抵抗値にバラツキが生じたり、カーボンストラクチャ
ーによる電気伝導が経時で変化するため、その抵抗値に
経時変化が生じるという問題を避けることは困難であっ
た。そこで、この発明は、上述した従来の問題点を解消
して、転写ベルト内の電気抵抗のバラツキや、その経時
変化を極力抑えることができ、安定して良好な画像を得
ることができる転写ベルトを提供することを課題として
いる。
Further, the transfer belt based on EDPM uses a material in which carbon is added to rubber in order to obtain medium resistance. However, in the rubber in which conductivity is obtained by dispersing carbon, the structure state of carbon is used. Greatly affects the electrical resistance, and if the carbon structure is not evenly distributed in one transfer belt, the resistance value of the transfer belt may vary and the electrical conductivity due to the carbon structure may change over time. It was difficult to avoid the problem that the values change over time. Therefore, the present invention solves the above-mentioned conventional problems and can suppress variations in electric resistance in the transfer belt and changes over time as much as possible, and can stably obtain a good image. The challenge is to provide.

【0005】[0005]

【課題を解決するための手段】この発明の要旨は、中抵
抗のゴム材を内層とし、この内層にウレタン誘電層を形
成した2重構造であって、像担持体上のトナー画像の用
紙への転写、又は用紙の搬送、あるいはその両方の機能
を有する転写ベルトにおいて、前記ゴム材としてヒドリ
ンゴムを用いたことである。
SUMMARY OF THE INVENTION The gist of the present invention is a double structure in which a rubber material having a medium resistance is used as an inner layer and a urethane dielectric layer is formed on the inner layer. The hydrin rubber is used as the rubber material in the transfer belt having the functions of transferring the sheet, conveying the sheet, or both.

【0006】[0006]

【作用】したがって、転写ベルトの内層に用いるヒドリ
ンゴムは、カーボンを分散することなく、中抵抗が得ら
れるため、カーボンを分散した場合に生じる抵抗値のバ
ラツキや経時変化が抑えられる。
Therefore, since the hydrin rubber used for the inner layer of the transfer belt can obtain a medium resistance without dispersing carbon, variations in resistance value and changes with time that occur when carbon is dispersed can be suppressed.

【0007】[0007]

【実施例】以下、この発明の実施例を図面を参照して説
明する。この発明に関わる転写ベルト装置を図1に示し
ており、同図において、感光体ドラム1の前方にレジス
トローラ16が、又感光体ドラム1に当接して転写ベル
ト2がそれぞれ配置され、この転写ベルト2は、駆動ロ
ーラ3と従動ローラ4により張架されていて、電気抵抗
が中抵抗であるゴム材のヒドリンゴムから成る内層2a
と、この内層2aの上に表面層としてウレタンによる誘
電層2b(表面抵抗1012Ω)が形成された2重構造に
なっている。駆動ローラ3は金属ローラの外周面に転写
ベルト2との摩擦係数を高めるためのゴム層を巻装して
形成され、従動ローラ4は金属ローラから成っている。
そして、転写ベルト2の内周面の、感光体ドラム1と転
写ベルト2とのニップ部17から駆動ローラ3の方へ所
定距離だけ離れた位置に、電圧印加のためのバイアスロ
ーラ5が当接して配置され、また、このバイアスローラ
5と駆動ローラ3との間に接触板6が転写ベルト2の内
周面に当接して配置されている。このバイアスローラ5
は、金属ローラであって、転写ベルト2の回転に従動し
て回転し、接触板6は金属板であって、これらは共に電
源7に接続され(接触板6は転写制御板8を介して)て
いる。
Embodiments of the present invention will be described below with reference to the drawings. A transfer belt device according to the present invention is shown in FIG. 1, in which a registration roller 16 is arranged in front of a photosensitive drum 1 and a transfer belt 2 is arranged in contact with the photosensitive drum 1 respectively. The belt 2 is stretched around a driving roller 3 and a driven roller 4, and is an inner layer 2a made of hydrin rubber, which is a rubber material having a medium electric resistance.
Then, a dielectric layer 2b (surface resistance 10 12 Ω) made of urethane is formed as a surface layer on the inner layer 2a to form a double structure. The drive roller 3 is formed by winding a rubber layer around the outer peripheral surface of a metal roller for increasing the friction coefficient with the transfer belt 2, and the driven roller 4 is a metal roller.
Then, the bias roller 5 for applying a voltage is brought into contact with the inner peripheral surface of the transfer belt 2 at a position separated from the nip portion 17 between the photosensitive drum 1 and the transfer belt 2 toward the drive roller 3 by a predetermined distance. Further, a contact plate 6 is arranged between the bias roller 5 and the driving roller 3 so as to be in contact with the inner peripheral surface of the transfer belt 2. This bias roller 5
Is a metal roller, which rotates following the rotation of the transfer belt 2, and the contact plate 6 is a metal plate, both of which are connected to the power source 7 (the contact plate 6 is connected via the transfer control plate 8). )ing.

【0008】また、転写ベルト2の後端部から所定距離
だけ離れた位置に、定着ローラ13と加圧ローラ14か
ら成る定着装置15が配置されている。
A fixing device 15 including a fixing roller 13 and a pressure roller 14 is arranged at a position separated from the rear end of the transfer belt 2 by a predetermined distance.

【0009】ところで、転写ベルト2の構造例として、
前述したように、従来より使用されている2重構造があ
げられる。それは、中抵抗のEPDMを内層とし、この
EPDMは、ゴム練り、押し出し、加硫、研磨の順に各
工程を経て、厚みt=0.5(mm)で形成し、このEP
DMの表面にウレタン樹脂をスプレー塗布し、20μm
の膜を得ていた。この実施例では、同様の製法を採用
し、従来のEPDMの代わりに前記ヒドリンゴム(内層
2a)を用いている。尚、ウレタンは、商品名C−23
0u主剤(広野化学株式会社製)100重量部、商品名
C−230u硬化剤(広野化学株式会社製)30重量部
からなるものを使用した。
By the way, as an example of the structure of the transfer belt 2,
As described above, the double structure that has been conventionally used can be cited. It has a medium resistance EPDM as an inner layer, and this EPDM is formed to have a thickness t = 0.5 (mm) through the steps of kneading rubber, extruding, vulcanizing and polishing in this order.
20μm of urethane resin spray coated on the surface of DM
Was getting a film. In this embodiment, the same manufacturing method is adopted, and the hydrin rubber (inner layer 2a) is used instead of the conventional EPDM. Urethane is the product name C-23
100 parts by weight of 0 u main agent (manufactured by Hirono Chemical Co., Ltd.) and 30 parts by weight of C-230u curing agent (manufactured by Hirono Chemical Co., Ltd.) were used.

【0010】上記構成において、先ず、レジストローラ
16で搬送された用紙8は、転写ベルト2上に乗せられ
る。電源7からバイアスローラ5を介して電圧を印加す
ることにより、電流は感光体ドラム1及び接触板6側に
流れる。ここで、図3に示すように、電源7から出力さ
れる印加電流をI1、転写ベルト2を介して接触板6よ
りアース側へ流れる帰還電流をI2とすると、この帰還
電流I2を検知し、I1−I2=Ioutが一定になるように
電源7の電圧を変化させ、印加電流I1の値を制御して
いる。この実施例では、Iout=40μAとしている。
用紙8には、この方式で感光体ドラム1上のトナー画像
が転写され、転写ベルト2上を搬送される。次に、駆動
ローラ3の曲率によって用紙8は転写ベルト2からはが
れ、定着ローラ13及び加圧ローラ14によりトナーは
固着される。
In the above structure, first, the sheet 8 conveyed by the registration rollers 16 is placed on the transfer belt 2. By applying a voltage from the power supply 7 via the bias roller 5, a current flows to the photoconductor drum 1 and the contact plate 6 side. Here, as shown in FIG. 3, when the applied current output from the power source 7 is I 1 and the feedback current flowing from the contact plate 6 to the ground side through the transfer belt 2 is I 2 , this feedback current I 2 The value of the applied current I 1 is controlled by detecting and changing the voltage of the power supply 7 so that I 1 −I 2 = Iout becomes constant. In this embodiment, Iout = 40 μA.
The toner image on the photosensitive drum 1 is transferred onto the sheet 8 by this method and is conveyed on the transfer belt 2. Next, the sheet 8 is peeled off from the transfer belt 2 due to the curvature of the driving roller 3, and the fixing roller 13 and the pressure roller 14 fix the toner.

【0011】次に、ヒドリンゴムとEPDMを用いた転
写ベルトの比較例について説明する。先ず、内層となる
ヒドリンゴムを表1、及び表2に示す配合で作成した。
Next, a comparative example of a transfer belt using hydrin rubber and EPDM will be described. First, hydrin rubber as an inner layer was prepared with the formulations shown in Tables 1 and 2.

【0012】[0012]

【表1】 [Table 1]

【0013】[0013]

【表2】 [Table 2]

【0014】これらを配合して、前述したように、ゴム
練り、押出し、加硫、研磨を経て成形した厚みt=0.
5(mm)のヒドリンゴムベルトの表面に、ウレタン樹脂
(上述のEDPMベルトの表面に塗布した材料と同様)を
スプレー塗布して転写ベルト21(表1の配合)と転写
ベルト22(表2の配合)を製造した。以上2種類のヒ
ドリンゴムをベースにした転写ベルト21及び22と、カ
ーボンブラックを分散したEDPMを内層とし、その表
面にウレタン樹脂(上述のEDPMベルトの表面に塗布
した材料と同様)をスプレー塗布した転写ベルト20を、
図4に示す体積抵抗率測定系において、各ベルトの抵抗
値をランダムに5個所で測定し、これを体積抵抗率に変
換して表3の結果が得られた。(図4において、20と
21は電圧印加電極、22はグリッド電極である。)
As described above, these materials are blended and kneaded with rubber, extruded, vulcanized, and ground to obtain a thickness t = 0.
On the surface of the 5 (mm) hydrin rubber belt, urethane resin
(The same material as the material applied to the surface of the EDPM belt described above) was spray-coated to manufacture a transfer belt 2 1 (composition of Table 1) and a transfer belt 2 2 (composition of Table 2). The transfer belts 2 1 and 2 2 based on the above two types of hydrin rubber and EDPM in which carbon black is dispersed are used as an inner layer, and urethane resin (the same as the material applied to the surface of the EDPM belt described above) is spray-coated on the surface thereof. the transfer belt 2 0 was,
In the volume resistivity measurement system shown in FIG. 4, the resistance value of each belt was randomly measured at five points, and this was converted into volume resistivity to obtain the results in Table 3. (In FIG. 4, 20 and 21 are voltage application electrodes, and 22 is a grid electrode.)

【0015】[0015]

【表3】 [Table 3]

【0016】この表3から明らかなように、EDPMの
転写ベルト20の抵抗値が1ヶ月間で、1オーダー程度
上昇しているのに対して、ヒドリンゴムの転写ベルト2
1及び22の抵抗値変化は、共に半オーダー以下の上昇で
あった。
As apparent from Table 3, the resistance value of the transfer belt 2 0 EDPM is 1 month, whereas has increased about one order, transfer of hydrin rubber belt 2
1 and 2 2 of the resistance value change was both increased following half order.

【0017】また、1本の転写ベルト内の抵抗のバラツ
キに関しては、EDPMベルトの転写ベルト20の場合
はバラツキが1オーダー程度あるため、リコーFT55
00において画像出しを行うと白抜け画像が発生した。
しかし、ヒドリンゴムの転写ベルト21及び22は抵抗の
バラツキが殆ど無く、良好な画像を得ることができた。
尚、この実施例の転写ベルト21及び22は、図1に示
す方式構成の転写ベルト装置だけに限らず、例えば、帯
電や除電にコロナ放電を用いる装置構成等にも十分有効
に用いることができる。また、転写と搬送の機能を併用
する転写ベルトだけではなく、転写又は搬送の単独の機
能のみ有する転写ベルトにも使用できることは言うまで
もない。
Further, since regard to variations in the resistance in one transfer belt, in the case of the transfer belt 2 0 of EDPM belt variation is about one order, Ricoh FT55
When the image was output at 00, a blank image was generated.
However, the transfer belts 2 1 and 2 2 of hydrin rubber had almost no variation in resistance, and a good image could be obtained.
The transfer belt 2 1 and 2 2 of this embodiment is not limited to only the transfer belt apparatus of a system configuration shown in FIG. 1, for example, sufficiently effectively used in apparatus configuration of using a corona discharge to charge or charge removal You can Further, needless to say, the present invention can be used not only for a transfer belt that uses both transfer and transport functions, but also for a transfer belt that has only a single transfer or transport function.

【0018】[0018]

【発明の効果】以上説明したように、この発明によれ
ば、転写ベルトの内層のゴム材としてヒドリンゴムを用
いたので、添加剤を混ぜることなく中抵抗が得られ、カ
ーボンを分散した場合に比べて、ベルト内の抵抗値のバ
ラツキや経時変化を極力抑えることができる。したがっ
て、装置側で電源の出力電圧の制御等を行わずに、安定
して良好な画像と良好な搬送性を同時に得ることができ
る。
As described above, according to the present invention, since hydrin rubber is used as the rubber material of the inner layer of the transfer belt, a medium resistance can be obtained without mixing an additive, and carbon is dispersed as compared with the case of dispersing carbon. As a result, it is possible to suppress variations in the resistance value in the belt and changes with time as much as possible. Therefore, it is possible to stably obtain a good image and a good carrying property at the same time without controlling the output voltage of the power source on the device side.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明に関わる転写ベルト装置の実施例を示
す全体概略構成図である。
FIG. 1 is an overall schematic configuration diagram showing an embodiment of a transfer belt device according to the present invention.

【図2】この発明の転写ベルトの2重構造を示す断面図
である。
FIG. 2 is a sectional view showing a double structure of the transfer belt of the present invention.

【図3】転写ベルト装置の転写部を示す拡大図である。FIG. 3 is an enlarged view showing a transfer portion of the transfer belt device.

【図4】体積抵抗率測定系を示す平面図及び側面図であ
る。
FIG. 4 is a plan view and a side view showing a volume resistivity measuring system.

【符号の説明】[Explanation of symbols]

1 像担持体 2 転写ベルト 2a 内層(ヒドリンゴム) 2b ウレタン誘電層 8 用紙 1 image carrier 2 transfer belt 2a inner layer (hydrin rubber) 2b urethane dielectric layer 8 paper

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】中抵抗のゴム材を内層とし、この内層にウ
レタン誘電層を形成した2重構造であって、像担持体上
のトナー画像の用紙への転写、又は用紙の搬送、あるい
はその両方の機能を有する転写ベルトにおいて、 前記ゴム材としてヒドリンゴムを用いたことを特徴とす
る転写ベルト。
1. A double structure in which a rubber material of medium resistance is used as an inner layer and a urethane dielectric layer is formed on the inner layer, and a toner image on an image carrier is transferred to a sheet or conveyed, or A transfer belt having both functions, wherein hydrin rubber is used as the rubber material.
JP6064992A 1994-04-01 1994-04-01 Transfer belt Pending JPH07271204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6064992A JPH07271204A (en) 1994-04-01 1994-04-01 Transfer belt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6064992A JPH07271204A (en) 1994-04-01 1994-04-01 Transfer belt

Publications (1)

Publication Number Publication Date
JPH07271204A true JPH07271204A (en) 1995-10-20

Family

ID=13274074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6064992A Pending JPH07271204A (en) 1994-04-01 1994-04-01 Transfer belt

Country Status (1)

Country Link
JP (1) JPH07271204A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6728502B2 (en) 2002-03-15 2004-04-27 Fuji Xerox Co., Ltd. Electroconductive member and image forming apparatus using the same
US7856200B2 (en) 2006-02-03 2010-12-21 Fuji Xerox Co., Ltd. Semiconductive belt, semiconductive roll and image forming apparatus using these members
JP2012237901A (en) * 2011-05-12 2012-12-06 Toyo Tire & Rubber Co Ltd Semiconductive belt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6728502B2 (en) 2002-03-15 2004-04-27 Fuji Xerox Co., Ltd. Electroconductive member and image forming apparatus using the same
US7856200B2 (en) 2006-02-03 2010-12-21 Fuji Xerox Co., Ltd. Semiconductive belt, semiconductive roll and image forming apparatus using these members
JP2012237901A (en) * 2011-05-12 2012-12-06 Toyo Tire & Rubber Co Ltd Semiconductive belt

Similar Documents

Publication Publication Date Title
US7127191B2 (en) Cleaning device for collecting toner on a surface of an image forming apparatus
US5832351A (en) Transfer sheet and image forming apparatus
US6266495B1 (en) Image forming apparatus using transfer roller having low resistance unevenness in circumferential direction
JPH10207248A (en) Image forming device and manufacture of dielectric sheet
JP3749372B2 (en) One-component toner developing device
KR19980064686A (en) Image recording device
US6376594B1 (en) Conductive member
JP4500427B2 (en) Conductive member for electrophotographic apparatus
JPH07271204A (en) Transfer belt
JP3401995B2 (en) Semiconductive roll and method of manufacturing the same
US6483034B1 (en) Blade
EP1498787B1 (en) Image forming apparatus and semiconductive elastic roller for transferring toner images
JP3337887B2 (en) Elastic members for electrophotography
JPH09305039A (en) Picture forming device, its bias roll and manufacture of the roll
US6175709B1 (en) Toner support and image forming apparatus
JPH11338256A (en) Developing device
JP2000206779A (en) Toner carrier and image forming device
JPH09179414A (en) Transfer belt
JP3721007B2 (en) Color image forming apparatus and intermediate transfer member thereof
JP3399203B2 (en) Image forming apparatus and method for manufacturing backup roll thereof
JP2001132858A (en) Developing roller
JPH11202643A (en) Image forming device
JP3695134B2 (en) Image forming apparatus
JPH08137294A (en) Transfer-carrier device
JP3666009B2 (en) Image forming apparatus