JPH04278978A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH04278978A JPH04278978A JP4037491A JP4037491A JPH04278978A JP H04278978 A JPH04278978 A JP H04278978A JP 4037491 A JP4037491 A JP 4037491A JP 4037491 A JP4037491 A JP 4037491A JP H04278978 A JPH04278978 A JP H04278978A
- Authority
- JP
- Japan
- Prior art keywords
- transfer roller
- foam
- image forming
- transfer
- foamed
- 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
- 239000006260 foam Substances 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 229920001821 foam rubber Polymers 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920006327 polystyrene foam Polymers 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 abstract description 7
- 238000005187 foaming Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 239000007787 solid Substances 0.000 description 12
- 239000002344 surface layer Substances 0.000 description 11
- 210000004027 cell Anatomy 0.000 description 8
- 108091008695 photoreceptors Proteins 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 210000000497 foam cell Anatomy 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000010107 reaction injection moulding Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は複写機やプリンター等に
おける電子写真プロセスを利用する画像形成装置に関し
、さらに詳しくは、静電転写プロセスによる転写装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using an electrophotographic process in a copying machine, a printer, etc., and more particularly to a transfer apparatus using an electrostatic transfer process.
【０００２】0002
【従来の技術】電子写真プロセスの転写ローラを用いた
印刷装置は、感光体ドラム上に形成されたトナー像を記
録担体に転写させるために、軸外周に導電部材を配した
転写ローラとバイアスを印加するバイアス制御装置から
なる転写装置を備えている。[Prior Art] A printing device using a transfer roller for an electrophotographic process uses a transfer roller with a conductive member arranged around the outer circumference of the shaft and a bias in order to transfer a toner image formed on a photoreceptor drum to a recording medium. The transfer device includes a bias control device for applying bias.
【０００３】このような転写装置の転写ローラは、ゴム
等による弾性材料で形成され、駆動源と接続されている
。The transfer roller of such a transfer device is made of an elastic material such as rubber, and is connected to a drive source.
【０００４】このような装置によれば、感光体ドラム上
に形成されたトナー像を転写する場合には、転写ローラ
はその弾性により弾性変形して、記録担体との接触面積
を確保し、転写に必要な電界をトナー像面と記録担体と
の間に供給し転写を行うことができる。According to such a device, when transferring the toner image formed on the photoreceptor drum, the transfer roller is elastically deformed due to its elasticity to ensure a contact area with the recording medium and to transfer the toner image. Transfer can be performed by supplying the necessary electric field between the toner image surface and the recording carrier.
【０００５】又、転写ローラの駆動により記録担体に搬
送力を与えることができるので、記録担体の安定搬送が
できる。[0005] Furthermore, since a conveying force can be applied to the recording medium by driving the transfer roller, the recording medium can be conveyed stably.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、転写ロ
ーラより感光体ドラム上のトナー像と記録担体間にバイ
アス印加した場合、転写ローラと記録担体が一様に接触
しないと、転写に必要な電界が不均一にかかり、感光体
ドラム上のトナー像が効率よく記録担体に転写できず画
像のヌケなどが発生する。従って、転写ローラを記録担
体に均一に接触させるために、ある程度のニップが必要
となる。このニップを十分にとるためには、転写ローラ
を強く押し当てるか、転写ローラの硬度を低くする方法
などがあるが、前者の方法はトナー像の中央部分が強く
押し付けられすぎて、画像が抜けるという問題が生じる
。従って、転写ローラの硬度を低下させて、圧力を上げ
ずにニップを増加させるという方法が一般的である。[Problems to be Solved by the Invention] However, when a bias is applied between the toner image on the photoreceptor drum and the recording carrier by the transfer roller, if the transfer roller and the recording carrier do not come into uniform contact with each other, the electric field necessary for transfer will be reduced. As a result, the toner image on the photoreceptor drum cannot be efficiently transferred to the recording medium, resulting in missing images. Therefore, a certain amount of nip is required to bring the transfer roller into uniform contact with the record carrier. In order to create a sufficient amount of this nip, there are methods such as pressing the transfer roller harder or lowering the hardness of the transfer roller, but with the former method, the center of the toner image is pressed too hard, causing the image to come off. A problem arises. Therefore, a common method is to reduce the hardness of the transfer roller to increase the nip without increasing the pressure.
【０００７】この有効手段として、発泡部材を使用する
ことが知られている。通常の発泡部材は空隙部を有する
ため表面の凹凸が大きく、印加バイアスの供給源となる
転写ローラ軸と、弾性体である発泡部材が空隙を介して
接触するため、空隙にて放電を起こし電界ムラが発生し
やすい。又、記録担体と発泡部材の接触部においても、
同様に発泡部材の凹凸のために放電を起こし易く、電界
ムラが発生するという問題がある。[0007] As an effective means for this purpose, it is known to use a foam member. Ordinary foamed members have voids and therefore have large surface irregularities, and the transfer roller shaft, which is the source of the applied bias, comes into contact with the elastic foamed member through the voids, causing electrical discharge in the voids and causing an electric field. Unevenness is likely to occur. Also, at the contact area between the recording carrier and the foam member,
Similarly, there is a problem in that the unevenness of the foamed member tends to cause electrical discharge, resulting in uneven electric field.
【０００８】本発明はこのような事情に鑑みてなされた
ものであって、転写ローラ弾性部を発泡部材で形成する
画像形成装置において、画像のヌケ、ムラのない良好な
画像を転写できる新規な画像形成装置を提供するところ
にある。さらに他の目的は、製造が容易で低コストの転
写ローラを提供するところにある。The present invention has been made in view of the above circumstances, and provides a novel image forming apparatus in which the elastic portion of the transfer roller is formed of a foamed member, which can transfer good images without missing or uneven images. The company provides an image forming apparatus. Yet another object is to provide a transfer roller that is easy to manufacture and low cost.
【０００９】[0009]
【課題を解決するための手段】本発明はこのような問題
を解決するために、感光体ドラムと、これに圧接する弾
性転写ローラを備え、前記感光体ドラムと前記転写ロー
ラとの間に記録担体を通過させて転写する画像形成装置
において、前記転写ローラの弾性部を発泡部材で形成す
ると共に、前記転写ローラの軸との接触面及び発泡部材
表面において発泡セルの大きさが最小、又は数が最少と
なるようにした。[Means for Solving the Problems] In order to solve such problems, the present invention includes a photosensitive drum and an elastic transfer roller that is in pressure contact with the photosensitive drum, and a recording medium is formed between the photosensitive drum and the transfer roller. In an image forming apparatus that performs transfer by passing through a carrier, the elastic portion of the transfer roller is formed of a foamed member, and the size of the foamed cells is the smallest or the number of foamed cells on the contact surface with the shaft of the transfer roller and on the surface of the foamed member. was made to be the minimum.
【００１０】また、本発明の画像形成装置は、感光体ド
ラムと、これに圧接する弾性転写ローラを備え、前記感
光体ドラムと前記転写ローラとの間に記録担体を通過さ
せて転写する画像形成装置において、前記転写ローラの
弾性部を発泡部材で形成すると共に、前記発泡部材が導
電性であるようにした。Further, the image forming apparatus of the present invention includes a photosensitive drum and an elastic transfer roller that is in pressure contact with the photosensitive drum, and forms an image by passing a recording medium between the photosensitive drum and the transfer roller. In the apparatus, the elastic portion of the transfer roller is formed of a foamed member, and the foamed member is electrically conductive.
【００１１】さらに、本発明の画像形成装置は、発泡部
材が、軟質フォームで形成され、ポリウレタンフォーム
、ポリスチレンフォーム、ポリエチレンフォーム、エラ
ストマーフォーム、ゴムフォームのうちの何れかである
ようにした。Furthermore, in the image forming apparatus of the present invention, the foam member is made of flexible foam, and is any one of polyurethane foam, polystyrene foam, polyethylene foam, elastomer foam, and rubber foam.
【００１２】0012
【実施例】（実施例１）そこで以下に本発明の詳細を図
示した実施例に基づいて説明する。図１は、本発明の転
写ローラを用いた電子写真方式の印刷装置の要部を示す
概略断面図であって、図中符号１は感光体ドラムであっ
て、図中矢印Ｄ方向、つまり記録担体を左側に移動させ
る方向に回転し、上部には光ビームを発生する光信号発
生装置２が配設されている。EXAMPLES (Example 1) The details of the present invention will be explained below based on the illustrated examples. FIG. 1 is a schematic cross-sectional view showing the main parts of an electrophotographic printing apparatus using a transfer roller according to the present invention. It rotates in a direction to move the carrier to the left, and an optical signal generating device 2 that generates a light beam is disposed at the top.
【００１３】この感光体ドラム１の周囲には帯電ユニッ
ト３、現像装置４、イレースユニット５が配置されてい
る。感光体ドラム１の下方には、トナー画像を記録担体
に転写する本発明が特徴とする転写装置７が配置されて
いる。A charging unit 3, a developing device 4, and an erase unit 5 are arranged around the photosensitive drum 1. A transfer device 7, which is a feature of the present invention, is arranged below the photosensitive drum 1 for transferring a toner image onto a recording medium.
【００１４】図２は、本発明の転写装置の一実施例を示
すものであって、図中符号８は転写ローラで、１４は転
写ローラにバイアス印加するバイアス制御装置であり、
転写ローラ軸９に接続される。又、転写ローラ８は軸受
け１５により保持され、さらに、加圧バネ１６が軸受け
１５を介して転写ローラを感光体ドラム１に圧接するよ
うに配設される。また、転写ローラ８は、駆動歯車１７
を介して駆動源に接続するように構成されている。FIG. 2 shows an embodiment of the transfer device of the present invention, in which reference numeral 8 is a transfer roller, 14 is a bias control device for applying a bias to the transfer roller,
It is connected to the transfer roller shaft 9. Further, the transfer roller 8 is held by a bearing 15, and a pressure spring 16 is disposed so as to press the transfer roller against the photosensitive drum 1 via the bearing 15. Further, the transfer roller 8 is connected to a driving gear 17.
The drive source is configured to be connected to the drive source via the drive source.
【００１５】次に、転写ローラを構成する発泡部材につ
いて説明する。転写ローラ軸９の周囲に発泡部材からな
る弾性体１０を配し、弾性体１０は転写ローラ軸９との
接触面Ａと、表面Ｂの密度が中央部Ｃよりも大きくなる
ように形成されている。Next, the foamed member constituting the transfer roller will be explained. An elastic body 10 made of a foamed material is arranged around the transfer roller shaft 9, and the elastic body 10 is formed so that the density of the contact surface A with the transfer roller shaft 9 and the surface B is greater than that of the center part C. There is.
【００１６】図３は、本発明の画像形成装置の、転写ロ
ーラ弾性部の発泡セルの大きさや数を示す目安ともなる
密度分布を示す図である。軸に加硫接着等の手段または
軸との一体成形によって発泡部材が形成され、発泡部に
は連続した発泡セルを有し、十分な柔軟性を有しており
、軸外周部近傍及び弾性部表面近傍では密度が略放物線
状に増大し、少なくとも、軸外周部及び弾性部表面に発
泡部と同一物質で発泡セルの殆どないソリッド表層部が
形成される。このようなソリッド表層部は、型中に発泡
材料原液を射出注入して反応させる反応射出成形法等に
より形成することができ、ソリッド表層部を軸外周部に
も形成して固着強度を向上できるだけでなく、軸を型中
にインサートして一体成形すれば、加工工数が少なく、
機械精度の高い転写ローラを形成することができる。FIG. 3 is a diagram showing the density distribution, which also serves as a guideline for indicating the size and number of foam cells in the elastic portion of the transfer roller in the image forming apparatus of the present invention. A foamed member is formed on the shaft by means such as vulcanization adhesion or by integral molding with the shaft, and the foamed part has continuous foam cells and has sufficient flexibility, and the area near the outer peripheral part of the shaft and the elastic part The density increases in a substantially parabolic manner near the surface, and a solid surface layer portion with almost no foam cells made of the same material as the foamed portion is formed at least on the outer periphery of the shaft and on the surface of the elastic portion. Such a solid surface layer can be formed by a reaction injection molding method, etc. in which a foaming material stock solution is injected into a mold and reacted.The solid surface layer can also be formed on the outer periphery of the shaft to improve the adhesion strength. Instead, by inserting the shaft into the mold and molding it in one piece, the number of machining steps is reduced.
A transfer roller with high mechanical precision can be formed.
【００１７】尚、発泡部は単泡、連泡何れの形態でも使
用することができるが、単泡では温度による寸法変化が
大きいため連泡のほうが好ましい。又、発泡部の肉厚は
２〜１０ｍｍ程度、ソリッド表層部の肉厚を数百μｍと
することにより、従来ゴムでは困難であった非常に低い
圧力でたくさんのニップを確保できる。さらに、発泡材
料としては、軟質フォーム材料が好適であり、ポリウレ
タンフォーム、ポリスチレンフォーム、ポリエチレンフ
ォーム、エラストマーフォーム、ゴムフォーム等を用い
ることができる。さらに、発泡部材の製法としては、反
応射出成形法以外にも、気体混入法、発泡剤分解法、溶
剤気散法、化学反応法、焼結法、溶出法等を用いること
ができる。何れの製法でも、ソリッド表層部を形成する
ことにより、後加工をしなくとも高精度の寸法が得られ
、軽量で低価格の転写ローラを製作することができる。[0017] The foamed portion can be used in either a single cell or open cell form, but open cells are preferable because single cells have a large dimensional change due to temperature. Furthermore, by making the foamed part have a thickness of about 2 to 10 mm and the solid surface layer having a thickness of several hundred micrometers, it is possible to secure a large number of nips with very low pressure, which was difficult to do with conventional rubber. Further, as the foam material, a flexible foam material is suitable, and polyurethane foam, polystyrene foam, polyethylene foam, elastomer foam, rubber foam, etc. can be used. Furthermore, as a manufacturing method for the foamed member, in addition to the reaction injection molding method, a gas mixing method, a blowing agent decomposition method, a solvent aeration method, a chemical reaction method, a sintering method, an elution method, etc. can be used. In either manufacturing method, by forming a solid surface layer, highly accurate dimensions can be obtained without post-processing, and a lightweight and low-cost transfer roller can be manufactured.
【００１８】また、発泡部材はカーボンブラックや金属
等の導電性微粉末を分散させることにより導電化されて
いる。Further, the foamed member is made electrically conductive by dispersing electrically conductive fine powder such as carbon black or metal.
【００１９】この実施例において、印刷指令が入力され
ると、記録担体は図示してないスタッカより感光体ドラ
ム１に送りだされる。感光体ドラム１上には、帯電ユニ
ット３による帯電、光信号発生装置２による静電潜像形
成、現像装置４による静電潜像へのトナー付着の順に形
成されたトナー画像が形成される。この感光体ドラム１
上のトナー画像とスタッカより送りだされた記録担体は
転写ローラ８と感光体ドラム１により形成されているニ
ップ部に移動する。In this embodiment, when a print command is input, the record carrier is sent to the photosensitive drum 1 from a stacker (not shown). A toner image is formed on the photosensitive drum 1 in the following order: charging by the charging unit 3, formation of an electrostatic latent image by the optical signal generating device 2, and toner adhesion to the electrostatic latent image by the developing device 4. This photosensitive drum 1
The upper toner image and the recording carrier fed out from the stacker move to a nip formed by the transfer roller 8 and the photosensitive drum 1.
【００２０】次に、バイアス制御装置１４により、転写
ローラ軸９に転写に必要な電界をトナー像と記録担体間
に形成するためにバイアスを印加する。印加されたバイ
アスは転写ローラ軸９より、導電部材からなる弾性体１
０との接触面Ａに印加される。このとき、接触面Ａはソ
リッド表層部により形成されているため、転写ローラ軸
９とソリッド表層部との間には空隙はなくなり、軸方向
に均一なバイアス印加ができる。その後、中央部Ｃを通
り、表面Ｂにバイアス印加される。この時、表面Ｂもソ
リッド表層部により記録担体と接触しているため、前記
同様、ソリッド表層部と記録担体との間に生じる空隙に
よる放電が発生しにくいため、軸方向に安定したバイア
ス印加ができる。Next, the bias control device 14 applies a bias to the transfer roller shaft 9 in order to form an electric field necessary for transfer between the toner image and the recording medium. The applied bias is applied from the transfer roller shaft 9 to the elastic body 1 made of a conductive member.
is applied to the contact surface A with 0. At this time, since the contact surface A is formed by the solid surface layer, there is no gap between the transfer roller shaft 9 and the solid surface layer, and a uniform bias can be applied in the axial direction. A bias is then applied to the surface B through the central portion C. At this time, since the surface B is also in contact with the recording carrier through the solid surface layer, it is difficult to generate electric discharge due to the gap between the solid surface layer and the recording carrier, so that stable bias application in the axial direction is not possible. can.
【００２１】尚、この時にソリッド表層部肉厚を数百μ
ｍにすることにより、発泡部材の弾性を失わずに形成で
きるため、低い圧力でたくさんのニップが確保でき、バ
イアス印加がさらに安定する。[0021] At this time, the thickness of the solid surface layer should be reduced to several hundred microns.
m, the foamed member can be formed without losing its elasticity, so a large number of nips can be secured with low pressure, and bias application becomes more stable.
【００２２】このように、構成された転写装置で転写し
た画像は画像ヌケやムラのないものが出力できる。[0022] The image transferred by the transfer device configured in this way can be outputted without missing images or unevenness.
【００２３】又、ソリッド表層部は型面により形成され
るため、表面は滑らかになりトナーとの離形性が良くな
る。従って、感光体ドラム１上に付着した残留トナーが
、非転写時に転写ローラ８に付着しにくくなるため、記
録担体の裏汚れが減少し、さらに転写ローラの長寿命化
が図れた。Further, since the solid surface layer portion is formed by the mold surface, the surface is smooth and the releasability from the toner is improved. Therefore, the residual toner on the photoreceptor drum 1 becomes less likely to adhere to the transfer roller 8 during non-transferring, thereby reducing stains on the back of the recording medium and further extending the life of the transfer roller.
【００２４】（実施例２）又、一般に弾性体の導電化を
する場合、均一にカーボンブラックなどの導電性微粉末
を分散させるのには原料の選定、攪拌条件の適性化など
最適化を計る必要があり非常に困難を有する。その対策
として、図４のように、径方向断面がドーナッツ状の、
導電部材よりなる弾性体１０を形成してから、転写ロー
ラ軸９の周辺に抵抗値調整材１１を塗ったものを、後工
程により弾性体１０にインサートする方法がある。この
方法は、設定抵抗値に対しある程度の抵抗値を持たせた
弾性体１０に、抵抗精度の良い抵抗値調整材１１を塗っ
た転写ローラ軸９により調整し、設定値にするものであ
る。この方法において製造された転写ローラ８も、本発
明の弾性体と同製造法によりできるため、同様の作用を
奏することは明かである。(Example 2) Generally, when making an elastic body conductive, in order to uniformly disperse conductive fine powder such as carbon black, it is necessary to optimize the selection of raw materials and the appropriate stirring conditions. It is necessary and has great difficulty. As a countermeasure, as shown in Fig. 4, the radial section is donut-shaped.
There is a method in which after forming the elastic body 10 made of a conductive member, a resistance value adjusting material 11 is coated around the transfer roller shaft 9 and then inserted into the elastic body 10 in a post-process. In this method, an elastic body 10 having a certain resistance value relative to a set resistance value is adjusted to a set value using a transfer roller shaft 9 coated with a resistance value adjusting material 11 having high resistance accuracy. Since the transfer roller 8 manufactured by this method is also manufactured by the same manufacturing method as the elastic body of the present invention, it is clear that it exhibits the same effect.
【００２５】[0025]
【発明の効果】以上説明したように本発明においては、
感光体ドラムと、これに圧接する弾性転写ローラを備え
、感光体ドラムと転写ローラとの間に記録担体を通過さ
せて転写する画像形成装置において、転写ローラの弾性
部を発泡部材で形成すると共に、転写ローラの軸との接
触面及び発泡部材表面において発泡セルの大きさが最小
、又は数が最少となるように形成したので、転写ローラ
軸から弾性体へのバイアス印加及び弾性体から記録担体
へのバイアス印加が、空隙部の放電による効率低下が少
なくなるため、記録担体へ均一にバイアス印加でき、転
写に必要な電界を均一に与えることができる。また、弾
性体のソリッド部が型面により滑らかになるため、トナ
ー離形性が向上し、残留トナーが転写ローラに付着しに
くくなるため、転写ローラの長寿命化及び記録担体の裏
面汚れが減少することができる。さらにまた、一工程に
て、弾性体の成形ができるため、低コストの転写ローラ
を提供することができる。[Effects of the Invention] As explained above, in the present invention,
In an image forming apparatus that includes a photoreceptor drum and an elastic transfer roller that is in pressure contact with the photoreceptor drum, and transfers a recording medium by passing it between the photoreceptor drum and the transfer roller, the elastic portion of the transfer roller is formed of a foamed member. Since the size of the foamed cells is minimized or the number of foamed cells is minimized on the contact surface with the transfer roller shaft and on the surface of the foamed member, bias is applied from the transfer roller shaft to the elastic body, and from the elastic body to the recording carrier. Since there is less reduction in efficiency due to discharge in the gap, bias can be uniformly applied to the recording carrier, and the electric field necessary for transfer can be uniformly applied. In addition, the solid part of the elastic body becomes smoother on the mold surface, improving toner releasability and making it difficult for residual toner to adhere to the transfer roller, extending the life of the transfer roller and reducing stains on the back side of the recording medium. can do. Furthermore, since the elastic body can be formed in one step, a low-cost transfer roller can be provided.
【図１】本発明の画像形成装置の概略断面図。FIG. 1 is a schematic cross-sectional view of an image forming apparatus of the present invention.
【図２】本発明の実施例１における転写装置の正面図と
断面図。FIG. 2 is a front view and a sectional view of a transfer device in Example 1 of the present invention.
【図３】本発明の転写ローラの密度分布図。FIG. 3 is a density distribution diagram of the transfer roller of the present invention.
【図４】本発明の実施例２における転写装置の断面図。FIG. 4 is a sectional view of a transfer device in Example 2 of the present invention.
７ 転写装置 ８ 転写ローラ ９ 転写ローラ軸 １０ 弾性体 １４ バイアス制御装置 １５ 軸受け １６ 加圧バネ 7 Transfer device 8 Transfer roller 9 Transfer roller shaft 10 Elastic body 14 Bias control device 15 Bearing 16 Pressure spring
Claims (3)
転写ローラを備え、前記感光体ドラムと前記転写ローラ
との間に記録担体を通過させて転写する画像形成装置に
おいて、前記転写ローラの弾性部を発泡部材で形成する
と共に、前記転写ローラの軸との接触面及び発泡部材表
面において発泡セルの大きさが最小、又は数が最少とな
るように形成したことを特徴とする画像形成装置。1. An image forming apparatus comprising a photoconductor drum and an elastic transfer roller that is in pressure contact with the photoconductor drum, and in which a recording medium is passed between the photoconductor drum and the transfer roller to be transferred, wherein the elasticity of the transfer roller is An image forming apparatus characterized in that the portion is formed of a foamed member, and the foamed cells are formed to have a minimum size or a minimum number on the contact surface with the shaft of the transfer roller and on the surface of the foamed member.
転写ローラを備え、前記感光体ドラムと前記転写ローラ
との間に記録担体を通過させて転写する画像形成装置に
おいて、前記転写ローラの弾性部を発泡部材で形成する
と共に、前記発泡部材が導電性であることを特徴とする
請求項１に記載の画像形成装置。2. An image forming apparatus comprising a photoconductor drum and an elastic transfer roller that is in pressure contact with the photoconductor drum, and in which a recording medium is passed between the photoconductor drum and the transfer roller to be transferred, wherein the elasticity of the transfer roller is The image forming apparatus according to claim 1, wherein the portion is formed of a foamed member, and the foamed member is electrically conductive.
され、ポリウレタンフォーム、ポリスチレンフォーム、
ポリエチレンフォーム、エラストマーフォーム、ゴムフ
ォームのうちの何れかであることを特徴とする請求項１
または２に記載の画像形成装置。3. The foam member is made of flexible foam, and includes polyurethane foam, polystyrene foam,
Claim 1 characterized in that it is any one of polyethylene foam, elastomer foam, and rubber foam.
or the image forming apparatus according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4037491A JP2887922B2 (en) | 1991-03-07 | 1991-03-07 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4037491A JP2887922B2 (en) | 1991-03-07 | 1991-03-07 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04278978A true JPH04278978A (en) | 1992-10-05 |
| JP2887922B2 JP2887922B2 (en) | 1999-05-10 |
Family
ID=12578880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4037491A Expired - Fee Related JP2887922B2 (en) | 1991-03-07 | 1991-03-07 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2887922B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5878314A (en) * | 1997-01-21 | 1999-03-02 | Sharp Kabushiki Kaisha | Image-forming device and method of manufacturing dielectric sheet |
| US6081685A (en) * | 1998-01-07 | 2000-06-27 | Sharp Kabushiki Kaisha | Transfer apparatus having a transfer drum |
-
1991
- 1991-03-07 JP JP4037491A patent/JP2887922B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5878314A (en) * | 1997-01-21 | 1999-03-02 | Sharp Kabushiki Kaisha | Image-forming device and method of manufacturing dielectric sheet |
| US6081685A (en) * | 1998-01-07 | 2000-06-27 | Sharp Kabushiki Kaisha | Transfer apparatus having a transfer drum |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2887922B2 (en) | 1999-05-10 |
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