JPH09160401A - Production of semiconductive elastic roller - Google Patents
Production of semiconductive elastic rollerInfo
- Publication number
- JPH09160401A JPH09160401A JP32292295A JP32292295A JPH09160401A JP H09160401 A JPH09160401 A JP H09160401A JP 32292295 A JP32292295 A JP 32292295A JP 32292295 A JP32292295 A JP 32292295A JP H09160401 A JPH09160401 A JP H09160401A
- Authority
- JP
- Japan
- Prior art keywords
- resistance
- transfer roller
- transfer
- roller
- toner
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電子写真方式を用
いた複写機やプリンター、ファクシミリ等の画像形成装
置に用いる半導電性弾性ローラの製造方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a semiconductive elastic roller used in an image forming apparatus such as a copying machine, a printer or a facsimile, which uses an electrophotographic method.
【０００２】[0002]
【従来の技術】像担持体表面に形成したトナー像に、紙
等のシート状の転写材を当接し、これに転写バイアスを
印加して前記トナー像を転写材に転写するように構成し
た画像形成装置は従来からよく知られている。2. Description of the Related Art An image constructed such that a toner image formed on the surface of an image carrier is brought into contact with a sheet-like transfer material and a transfer bias is applied to the transfer material to transfer the toner image to the transfer material. Forming devices are well known in the art.
【０００３】図１０はこのような装置の具体例として画
像の記録にレーザ光を用いるレーザ方式ページプリンタ
ーの概略構成を表している。図１０の構成における画像
形成の工程としては、まず、レーザダイオード１から発
振されたレーザ光がポリゴンミラー２へ照射され反射さ
れた後、レンズ３を介して折り返しミラー４で折り返さ
れて感光ドラム６の表面へ入射される。FIG. 10 shows a schematic configuration of a laser system page printer using a laser beam for recording an image as a specific example of such an apparatus. In the image forming process in the configuration of FIG. 10, first, the laser light oscillated from the laser diode 1 is applied to the polygon mirror 2 to be reflected, and then is reflected by the folding mirror 4 via the lens 3 to be reflected by the photosensitive drum 6. Is incident on the surface of.
【０００４】このとき、感光ドラム６の表面は帯電ロー
ラ５によって予め所望の電位に帯電されており、レーザ
光によって露光された部分の表面電位のみが低下して潜
像が形成される。現像容器８の中に詰め込まれたトナー
９が現像スリーブ７によって感光ドラムの対向面まで搬
送されると、現像容器内で感光ドラムの帯電極性と同一
極性に帯電されたトナー９が現像スリーブと感光ドラム
芯金間にかけられた電界によって上記感光ドラム上の潜
像部分の低電位領域に運ばれて付着する。次に、この付
着したトナーは転写ローラ１０にかけられた高電圧の電
界により感光ドラム表面からはぎ取られ、転写材１３の
表面に転写される。At this time, the surface of the photosensitive drum 6 is previously charged to a desired potential by the charging roller 5, and only the surface potential of the portion exposed by the laser beam is lowered to form a latent image. When the toner 9 packed in the developing container 8 is conveyed to the opposing surface of the photosensitive drum by the developing sleeve 7, the toner 9 charged to the same polarity as the charging polarity of the photosensitive drum in the developing container is exposed to the developing sleeve. An electric field applied between the drum cores carries and attaches to the low potential region of the latent image portion on the photosensitive drum. Next, the adhered toner is peeled off from the surface of the photosensitive drum by the high voltage electric field applied to the transfer roller 10 and transferred to the surface of the transfer material 13.
【０００５】トナーを乗せられた転写材は次に定着ロー
ラ１４と加圧ローラ１６のニップ部へと搬送され、この
ニップ部でハロゲンヒータ１５からの熱とローラ間の圧
力によって画像を定着される。また、この間、転写後の
感光ドラム表面に転写されずに残った不要トナーはクリ
ーニングブレード１２によって感光ドラム表面から掻き
落とされ、廃トナー容器１１中に回収される。また、ク
リーニングブレードの下部や現像スリーブの下部にはト
ナー漏れを防ぐためにトナー漏れ防止シート１７が設け
られている。The transfer material carrying the toner is then conveyed to the nip portion between the fixing roller 14 and the pressure roller 16, and the image is fixed in the nip portion by the heat from the halogen heater 15 and the pressure between the rollers. . During this time, the unnecessary toner left untransferred on the surface of the photosensitive drum after the transfer is scraped off from the surface of the photosensitive drum by the cleaning blade 12 and collected in the waste toner container 11. A toner leakage prevention sheet 17 is provided below the cleaning blade and the developing sleeve to prevent toner leakage.
【０００６】しかしながら、従来、このような装置の転
写工程において転写ローラの抵抗値が高過ぎると転写時
に転写電荷が十分に転写材に供給できなくなり、トナー
を転写材の裏面から引き付けるためのクーロン引力より
も転写材表面の帯電電荷によるクーロン引力の方が勝っ
て、転写材上のトナー画像の輪郭部のトナーが周囲の白
地部に向かって飛び散る現象（以下、この現象を「飛び
散り」と呼ぶ）を生じ、一方、転写ローラの抵抗が低過
ぎると転写電流が流れ易くなるため、紙の厚さ方向で局
所的に抵抗の低い部分に転写電荷が転写材の裏面側から
表面側にリークし、感光ドラム表面の帯電トナーの電荷
をキャンセルして部分的な転写不良を招き、画像上に細
かな白斑点状の跡として現れる現象（以下、この現象を
「白斑点状跡」と呼ぶ）を生じていた。However, conventionally, when the resistance value of the transfer roller is too high in the transfer process of such an apparatus, the transfer charge cannot be sufficiently supplied to the transfer material at the time of transfer, and the Coulomb attractive force for attracting the toner from the back surface of the transfer material. Phenomenon in which Coulomb attraction due to the charge on the surface of the transfer material prevails, and toner on the outline of the toner image on the transfer material scatters toward the surrounding white background (hereinafter, this phenomenon is called "scattering") On the other hand, when the resistance of the transfer roller is too low, the transfer current easily flows, so the transfer charge locally leaks from the back surface side to the front surface side of the transfer material in the low resistance portion in the thickness direction of the paper. Phenomenon that appears as fine white spots on the image by canceling the charge of the charged toner on the surface of the photosensitive drum and causing partial transfer defects (hereinafter, this phenomenon is referred to as "white spots"). Had caused the department).
【０００７】さらに、上記の不良画像の内、「飛び散
り」については、転写ローラの左右両端部で発生し易い
傾向があり、抵抗規格上限付近の転写ローラの抵抗を徐
々に上げていくと左右両端部から「飛び散り」は発生し
始める。この要因は転写ローラを感光ドラムに圧接させ
たときの転写ローラの芯金から感光ドラムへ向かう方向
の抵抗が軸方向で均一でなく、左右両端部の抵抗が高く
なるためであり、転写ローラの材料である発泡導電性ゴ
ムが圧力を受けた部分の抵抗が増加する性質を持つこと
に起因している。Further, among the above-mentioned defective images, "scattering" tends to occur at the left and right ends of the transfer roller, and when the resistance of the transfer roller near the upper limit of the resistance standard is gradually increased, the left and right ends are gradually increased. "Scattering" begins to occur from the department. This is because when the transfer roller is pressed against the photosensitive drum, the resistance in the direction from the core metal of the transfer roller to the photosensitive drum is not uniform in the axial direction, and the resistance at both left and right ends is high. This is because the foamed conductive rubber, which is the material, has the property of increasing the resistance of the portion under pressure.
【０００８】図３はその実例を示すもので、図３（Ａ）
の転写ローラ１０は直径１２ｍｍ、長さ４０７ｍｍの鉄
芯金の周りに厚さ３．８ｍｍ、長さ２９７ｍｍの発泡導
電性ゴムを巻き付けたものであり、ローラの外径は１
９．６ｍｍとなる。FIG. 3 shows an example of this, and FIG.
The transfer roller 10 has a diameter of 12 mm, a length of 407 mm, and a foamed conductive rubber having a thickness of 3.8 mm and a length of 297 mm, which is wound around an iron core.
It will be 9.6 mm.
【０００９】転写ローラ単体の抵抗の軸方向分布を測定
するために、１０ｍｍ幅の導電テープをローラ表面に巻
き、芯金と導電テープの間の抵抗を求めたところ、同一
のゴムで均一に形成されているため図３（Ｂ）に示すよ
うに転写ローラ単体の抵抗の軸方向分布はほぼ均一にな
っている。In order to measure the axial distribution of the resistance of the transfer roller alone, a conductive tape having a width of 10 mm was wound around the roller surface, and the resistance between the core metal and the conductive tape was determined. Therefore, as shown in FIG. 3B, the axial distribution of the resistance of the transfer roller alone is substantially uniform.
【００１０】しかしながら、図３（Ｃ）のように芯金両
端の軸受け１８に片側５００ｇ重で計１０００ｇ重の加
圧をかけて感光ドラム６に圧接すると芯金がａ方向に撓
み、感光ドラム６と転写ローラでのニップは図３（Ｅ）
のようになる。ゴムの両端部に圧力が集中してしまうの
で、図４の装置を用いて、仮想感光ドラムとしての絶縁
ドラム１０６の上に巻き付けた１０枚のステンレス板１
９を、それぞれに抵抗１ｋΩを介してアースに落してい
る。荷重ｘは片側５００ｇ重で計１０００ｇ重の加圧を
かけている。However, as shown in FIG. 3C, when the bearings 18 at both ends of the core metal are pressed against the photosensitive drum 6 by applying a pressure of 500 g weight on one side to a total weight of 1000 g, the core metal bends in the direction a and the photosensitive drum 6 And the nip between the transfer roller is shown in Fig. 3 (E).
become that way. Since the pressure is concentrated on both ends of the rubber, the 10 stainless steel plates 1 wound around the insulating drum 106 as the virtual photosensitive drum by using the apparatus of FIG.
9 is grounded via a resistance of 1 kΩ. The load x is 500 g weight on one side and a total of 1000 g weight is applied.
【００１１】それぞれの抵抗にかかる電圧を測定したと
ころ、図３（Ｄ）のように左右両端部の抵抗が中央部の
２倍以上に増加してしまう。When the voltage applied to each resistance was measured, the resistance at the left and right ends increased more than twice the resistance at the center, as shown in FIG.
【００１２】次に、転写ローラのゴムにかかる圧の大小
により、抵抗の変化を見るために図５の装置を用いて、
転写ローラへの片側荷重ｘを１００ｇから５００ｇに変
化させた。従って、両荷重２００ｇから１０００ｇの荷
重をかけて転写電流を求めたところ、図６の結果を得た
（１０００ｇのときの電流を基準１．０とした）。すな
わち、転写ローラのゴムへの圧力が高い方が、抵抗がア
ップしているのがわかる。従って、前述の転写ローラで
端部の抵抗が高かったのが理解できる。Next, the device of FIG. 5 is used to observe the change in resistance depending on the magnitude of the pressure applied to the rubber of the transfer roller.
The load x on one side applied to the transfer roller was changed from 100 g to 500 g. Therefore, when a transfer current was obtained by applying a load of 200 g to 1000 g of both loads, the result of FIG. 6 was obtained (the current at 1000 g was taken as the reference 1.0). That is, it can be seen that the higher the pressure on the rubber of the transfer roller, the higher the resistance. Therefore, it can be understood that the resistance at the end of the transfer roller was high.
【００１３】転写ローラ初期に「飛び散り」を生じてい
なくても、耐久していく間に左右両端部から「飛び散
り」が発生する場合もある。Even if "scattering" does not occur in the initial stage of the transfer roller, "scattering" may occur from both left and right end portions during durability.
【００１４】一般に、転写ローラの抵抗は耐久と共に低
下する傾向があるが、耐久によって「飛び散り」が生じ
るようになった転写ローラの軸方向抵抗分布を初期と耐
久後で比較すると、左右両端部の抵抗と中央部の抵抗の
差が耐久によって拡大しており、場合によっては左右両
端部の抵抗のみが初期からほとんど変化していないもの
もある。Generally, the resistance of the transfer roller tends to decrease with the endurance, but when the axial resistance distribution of the transfer roller in which "scattering" occurs due to the endurance is compared with the initial resistance after endurance, the left and right end portions are compared. The difference between the resistance and the resistance at the central portion is widened due to durability, and in some cases, only the resistance at the left and right ends has not changed much from the initial stage.
【００１５】このように大きな抵抗差が一本の転写ロー
ラ内に生じると転写電流は抵抗の低い中央部に集中して
流れるようになり、抵抗の絶対値自体が高くなくても左
右両端部の転写電荷が不足して「飛び散り」の発生を招
くものと思われる。このような耐久による抵抗変化の差
は耐久時の転写材の通紙部と非通紙部の差がそのまま反
映されたものと考えられるが、この現象により耐久後の
画質まで考慮すると転写ローラの歩留まりはさらに低下
することになる。When such a large resistance difference occurs in one transfer roller, the transfer current concentrates and flows in the central portion where the resistance is low, and even if the absolute value of the resistance is not high, the transfer current of both the left and right ends is increased. It is considered that the transfer charge is insufficient and "scattering" occurs. It is considered that such a difference in resistance change due to durability reflects the difference between the paper-passing portion and the non-paper-passing portion of the transfer material at the time of durability. The yield will be further reduced.
【００１６】[0016]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、帯電したトナーを保持した像担持体との対
向部に、転写材を挟持搬送しながら転写材の裏面に転写
バイアスを印加して転写材上にトナーを転写させる転写
ローラを有する画像形成装置において、転写ローラを像
担持体に押し当てた時に転写ローラの端部が高抵抗化す
る点である。また、帯電ローラでも軸方向で同じような
抵抗分布が発生することがある。The problem to be solved by the present invention is to apply a transfer bias to the back surface of the transfer material while nipping and transferring the transfer material to a portion facing the image carrier holding the charged toner. In the image forming apparatus having the transfer roller for transferring the toner onto the transfer material, the resistance of the end portion of the transfer roller becomes high when the transfer roller is pressed against the image carrier. Even in the charging roller, the same resistance distribution may occur in the axial direction.
【００１７】従って、本発明の目的は、上記問題点を解
決し、より広い抵抗範囲の転写ローラや帯電ローラ等の
半導電性弾性ローラの使用を可能とすることで、半導電
性弾性ローラの製造歩留りを上げて供給量を増やし、コ
ストダウンを図ることにある。Therefore, an object of the present invention is to solve the above-mentioned problems and to make it possible to use a semiconductive elastic roller such as a transfer roller or a charging roller having a wider resistance range. The purpose is to increase the manufacturing yield, increase the supply amount, and reduce costs.
【００１８】[0018]
【課題を解決する手段】すなわち、本発明は、芯金と、
その周りに、少なくとも体積抵抗値１０5 Ω・ｃｍ〜１
０10Ω・ｃｍの半導電性弾性体層を有する半導電性弾性
ローラの製造方法において、加硫発泡前のチューブ状弾
性体の内部に、径が中央部より端部の方が漸次大きい形
状あるいは径が中央部より端部の方が漸次小さい形状の
仮芯金を挿入して加硫発泡し、その後該仮芯金を取外
し、略ストレート形状の芯金を挿入することを特徴とす
る半導電性弾性ローラの製造方法である。That is, the present invention provides a core metal and
Around it, at least the volume resistance value of 10 5 Ω · cm to 1
In a method of manufacturing a semiconductive elastic roller having a semiconductive elastic body layer of 0 10 Ω · cm, in a tubular elastic body before vulcanization and foaming, a shape in which an end portion has a diameter gradually larger than an end portion is formed. Alternatively, it is characterized in that a temporary core metal having a diameter gradually smaller at the end portion than at the central portion is inserted and vulcanized and foamed, then the temporary core metal is removed, and a substantially straight core metal is inserted. It is a method of manufacturing a conductive elastic roller.
【００１９】帯電したトナーを保持した像担持体との対
向部に、転写材を挟持搬送しながら該転写材の裏面に転
写バイアスを印加して前記転写材上に前記トナーを転写
させる中抵抗の発泡導電性ゴムから成る転写ローラを有
する画像形成装置において、前記転写ローラを前記像担
持体に圧接させたときに該転写ローラの軸方向抵抗分布
が均一になるように、予め非接触状態の前記転写ローラ
の左右両端部の導電性を中央部より高くしたことにより
達成される。また、帯電ローラについてもこれと同様で
ある。While the transfer material is sandwiched and conveyed at a portion facing the image carrier holding the charged toner, a transfer bias is applied to the back surface of the transfer material to transfer the toner onto the transfer material. In an image forming apparatus having a transfer roller made of foamed conductive rubber, a non-contact state is preliminarily set so that the transfer roller has a uniform axial resistance distribution when the transfer roller is brought into pressure contact with the image carrier. This is achieved by making the conductivity of the left and right ends of the transfer roller higher than that of the central part. The same applies to the charging roller.
【００２０】[0020]
【発明の実施の形態】本発明によれば、転写ローラの端
部の導電性が中央部より高くなるので転写ローラを像担
持体に圧接させたときにローラの端部に加わる高い圧力
によってローラ端部の抵抗が高くなっても中央部との抵
抗差が低減され、全体として軸方向の抵抗分布が均一化
できるので従来よりも高い抵抗の転写ローラが使用でき
るようになって歩留りが上がると共に、耐久によってで
きる中央部と端部の抵抗差も低減されるので耐久による
画質の劣化を抑制することもできる。また、帯電ローラ
についてもこれと同様である。According to the present invention, the conductivity of the end portion of the transfer roller is higher than that of the central portion, so that when the transfer roller is brought into pressure contact with the image carrier, high pressure is applied to the end portion of the roller. Even if the resistance at the end becomes high, the difference in resistance from the center is reduced, and the resistance distribution in the axial direction can be made uniform as a whole, so it is possible to use a transfer roller with a higher resistance than before, and the yield is increased. Also, the resistance difference between the central portion and the end portion caused by the durability is also reduced, so that the deterioration of the image quality due to the durability can be suppressed. The same applies to the charging roller.
【００２１】[0021]
【実施例】本発明の半導電性弾性ローラの製造方法を実
施例により説明する。 ［実施例１］図１のフローチャートに従って説明する。
図１１の押し出し成形機を用いて、下記の配合を有する
原料組成物（可塑化温度が約３０℃、発泡温度が１００
℃となるように調製）を混練し、リボン状等の適当な形
状にしたものをホッパー１０８に供給する。EXAMPLES A method for manufacturing a semiconductive elastic roller of the present invention will be described by way of examples. [Embodiment 1] Description will be given in accordance with the flowchart of FIG.
Using the extruder shown in FIG. 11, a raw material composition having the following composition (plasticization temperature of about 30 ° C., foaming temperature of 100
(Prepared so that the temperature becomes 0 ° C.) and kneaded into a suitable shape such as a ribbon shape and supplied to the hopper 108.
【００２２】原料組成物配合 原料ポリマー：１００重量部（必要に応じて各種添加物
を含む） 複酸化物：１００重量部 カーボンブラック：４５重量部 絶縁オイル：６０重量部 発泡剤：５重量部Raw material composition blending Raw material polymer: 100 parts by weight (including various additives as necessary) Complex oxide: 100 parts by weight Carbon black: 45 parts by weight Insulating oil: 60 parts by weight Blowing agent: 5 parts by weight
【００２３】具体的には、以下の各成分を配合した原料
組成物を、混練機（不図示）で均一に混練分散したもの
である。Specifically, a raw material composition containing the following components is uniformly kneaded and dispersed by a kneader (not shown).
【００２４】ＥＰＤＭ（ＥＰＴ４０４５、三井石油化学
（株）製）１００重量部に対し、亜鉛華１０重量部、ス
テアリン酸２重量部、ＺｎＯ2 ・Ａｌ2 Ｏ3 １００重量
部、ＨＡＦカーボン４５重量部及びパラフィンオイル６
０重量部を配合し、これらをバンバリミキサー、ニダー
等の混練機で均一に分散混練した。尚、混練の条件は、
混練温度５０℃〜１５０℃、混練時間３０秒〜４０秒の
範囲から最適なものを選択した。10 parts by weight of zinc white, 2 parts by weight of stearic acid, 100 parts by weight of ZnO 2 .Al 2 O 3 , 45 parts by weight of HAF carbon, and 100 parts by weight of EPDM (EPT4045, manufactured by Mitsui Petrochemical Co., Ltd.) Paraffin oil 6
0 parts by weight were blended, and these were uniformly dispersed and kneaded with a kneading machine such as a Banbury mixer or a kneader. The kneading conditions are as follows:
The optimum one was selected from the range of kneading temperature of 50 ° C. to 150 ° C. and kneading time of 30 seconds to 40 seconds.
【００２５】得られた混練物１００重量部に対し、促進
剤（ノクセラーＭ、大内振興化学（株）製）１重量部、
硫黄２重量部、発泡剤（セイマイクＣ、三協化成（株）
製）５重量部、及び発泡助剤（セルトンＮＰ、三協化成
（株）製）５重量部をオープンロールによって分散混練
し、未加硫練り生地を得た。混練の条件は、混練温度４
０℃〜６０℃、混練時間２０分〜５０分の範囲から選択
した。この未加硫練り生地を幅１００ｍｍ〜１５０ｍｍ
のリボン状に切り、得られたリボン状生地を押し出し成
形機のホッパー１０８に供給し、押し出し成形機によっ
てチューブ状に押し出し成形した。With respect to 100 parts by weight of the obtained kneaded product, 1 part by weight of an accelerator (Nocceller M, manufactured by Ouchi Shinko Kagaku Co., Ltd.),
2 parts by weight of sulfur, foaming agent (SEIMIC C, Sankyo Kasei Co., Ltd.)
5 parts by weight) and 5 parts by weight of a foaming auxiliary agent (Celton NP, manufactured by Sankyo Kasei Co., Ltd.) were dispersed and kneaded by an open roll to obtain an unvulcanized kneaded material. The kneading conditions are kneading temperature 4
It was selected from the range of 0 ° C to 60 ° C and the kneading time of 20 minutes to 50 minutes. Width 100mm-150mm
The ribbon-shaped material was cut into a ribbon shape, and the obtained ribbon-shaped material was supplied to the hopper 108 of the extrusion molding machine, and extruded into a tube shape by the extrusion molding machine.
【００２６】得られた成形物をにカッターで切断するこ
とにより、所定寸法のチューブ状押し出し成形品（寸
法；内径４．５ｍｍ、外径１４．５ｍｍ、長さ３５０ｍ
ｍ）を多数得た。By cutting the obtained molded product with a cutter, a tubular extruded product having a predetermined size (size: inner diameter 4.5 mm, outer diameter 14.5 mm, length 350 m)
m) were obtained in large numbers.
【００２７】次に、図７の逆クラウン形状（寸法；中央
部の最小径２．５ｍｍ、ゴムの端部に相当する最大径
４．５ｍｍ、長さ３９０ｍｍ）のＫＮメッキされた鉄製
の仮芯金１０１を、チューブ状押し出し成形品（ゴム）
１０２の内部に挿入し、これらを成形品の両端から突出
した仮芯金両端部によって水平に支持させて、加硫トレ
イに設置した。この加硫トレイを加硫缶内にセットし
て、直接蒸気加硫方式によって１次加硫発泡を行った。
加硫発泡の条件は、圧力４〜１０ｋｇ／ｃｍ2 、温度１
４０℃〜１８０℃、加硫時間２０分〜４０分であった。Next, an inverted crown shape of FIG. 7 (dimensions: minimum diameter of the central portion is 2.5 mm, maximum diameter corresponding to the end of rubber is 4.5 mm, length is 390 mm) and is made of KN-plated iron temporary core. Gold 101 is extruded into a tube (rubber)
102 was inserted into the inside of the molded product, horizontally supported by both ends of the temporary core metal protruding from both ends of the molded product, and placed on a vulcanization tray. This vulcanization tray was set in a vulcanization can, and primary vulcanization foaming was performed by a direct steam vulcanization method.
The conditions for vulcanization and foaming are a pressure of 4 to 10 kg / cm 2 and a temperature of 1.
The temperature was 40 ° C to 180 ° C and the vulcanization time was 20 minutes to 40 minutes.
【００２８】次に、加硫缶から仮芯金の周りに形成され
たチューブ状発泡弾性体を取り外し、更に熱風炉で１８
０℃〜２００℃、１５分〜４０分の条件で加熱して２次
加硫を行い、発泡弾性体中の未反応の発泡剤を分解させ
るとともに、しわのない平滑な表面を有する発泡弾性体
を形成した。この段階で得られた多数のチューブ状発泡
弾性体の寸法は、内径２．５ｍｍ（中央部）〜４．５ｍ
ｍ（端部）、外径２６ｍｍ（中央部）〜２８ｍｍ（端
部）、長さ３５５ｍｍであった。Next, the tubular foamed elastic body formed around the false core was removed from the vulcanization can, and further 18
Secondary elastic vulcanization by heating at 0 ° C. to 200 ° C. for 15 minutes to 40 minutes to decompose unreacted foaming agent in the elastic foam and to provide elastic foam having a smooth surface without wrinkles. Was formed. The dimensions of the large number of tubular foam elastic bodies obtained at this stage have an inner diameter of 2.5 mm (central part) to 4.5 m.
m (end), outer diameter 26 mm (center) to 28 mm (end), and length 355 mm.
【００２９】次に、ローラ用の最終芯金であるストレー
ト形状の芯金（ＫＮメッキされた鉄製、寸法；外径１２
ｍｍ、長さ４０７ｍｍ）の周りに導電性接着剤（スリー
ボンド社製、合成ゴム系導電性接着剤３３１５）を塗布
し、風乾させた後、これを仮芯金から取り外したチュー
ブ状発泡体の内部に圧入することにより、芯金の周りに
発泡弾性体を接着して、芯金と発泡弾性体の接合体を得
た。Next, the final core metal for the roller is a straight core metal (made of KN-plated iron, dimensions: outer diameter 12).
mm, length 407 mm), a conductive adhesive (manufactured by ThreeBond Co., synthetic rubber-based conductive adhesive 3315) is applied to the periphery, air-dried, and then removed from the core metal inside the tubular foam. The foamed elastic body was adhered around the core metal by press-fitting to obtain a bonded body of the core metal and the foamed elastic body.
【００３０】得られた接合体に、オーブンで２００℃、
１０分間の加熱処理すなわち３次加硫を行い、冷却後、
発泡弾性体層の表面を研磨して形状を整え、図２に示す
構成の転写ローラ（芯金径；１２ｍｍ、芯金長；４０７
ｍｍ、ローラ外径；１９．６ｍｍ、発泡弾性体層長；２
９７ｍｍ）１０ａを得た。また、発泡弾性体層の硬度を
アスカーゴム硬度計（高分子計器株式会社製）によって
測定したところ、３０〜３５度ＡＳＣであり、発泡弾性
体層中の気泡径を発泡体の断面を光学顕微鏡によって測
定したところ、１００μｍ〜２５０μｍであった。さら
に、図４の装置にてローラの軸方向に１０箇所の発泡弾
性体層の抵抗値を測定すると転写ニップ３ｍｍで全てほ
ぼ１０7 Ω・ｃｍであった。すなわち、図２のようなロ
ーラが製造できた。The obtained bonded body was placed in an oven at 200 ° C.
After heat treatment for 10 minutes, that is, third vulcanization, and cooling,
The surface of the foamed elastic body layer is polished to adjust its shape, and the transfer roller having a structure shown in FIG. 2 (core diameter: 12 mm, core length: 407) is formed.
mm, roller outer diameter; 19.6 mm, foam elastic layer length; 2
97 mm) 10a was obtained. Further, the hardness of the foamed elastic body layer was measured by an Asker rubber hardness meter (manufactured by Kobunshi Keiki Co., Ltd.) and found to be 30 to 35 degrees ASC. When measured, it was 100 μm to 250 μm. Furthermore, it was all approximately 10 7 Omega · cm at the transfer nip 3mm and measuring the resistance of the foamed elastic layer of the 10 locations in the axial direction of the roller in the apparatus of FIG 4. That is, the roller as shown in FIG. 2 could be manufactured.
【００３１】この転写ローラを用いたレーザ方式ページ
プリンターについて説明する。A laser type page printer using this transfer roller will be described.
【００３２】図１０はこのような装置の具体例として画
像の記録にレーザ光を用いるレーザ方式ページプリンタ
ーの概略構成を表している。図１０の構成における画像
形成の工程としては、まず、レーザダイオード１から発
振されたレーザ光がポリゴンミラー２へ照射され反射さ
れた後、レンズ３を介して折り返しミラー４で折り返さ
れて感光ドラム６の表面へ入射される。FIG. 10 shows a schematic structure of a laser system page printer using a laser beam for recording an image as a specific example of such an apparatus. In the image forming process in the configuration of FIG. 10, first, the laser light oscillated from the laser diode 1 is applied to the polygon mirror 2 to be reflected, and then is reflected by the folding mirror 4 via the lens 3 to be reflected by the photosensitive drum 6. Is incident on the surface of.
【００３３】このとき、感光ドラム６の表面は帯電ロー
ラ５によって予め所望の電位に帯電されており、レーザ
光によって露光された部分の表面電位のみが低下して潜
像が形成される。現像容器８の中に詰め込まれたトナー
９が現像スリーブ７によって感光ドラムの対向面まで搬
送されると、現像容器内で感光ドラムの帯電極性と同一
極性に帯電されたトナー９が現像スリーブと感光ドラム
芯金間にかけられた電界によって上記感光ドラム上の潜
像部分の低電位領域に運ばれて付着する。次に、この付
着したトナーは転写ローラ１０にかけられた高電圧の電
界により感光ドラム表面からはぎ取られ、記録紙１６の
表面に転写される。At this time, the surface of the photosensitive drum 6 is previously charged to a desired potential by the charging roller 5, and only the surface potential of the portion exposed by the laser beam is lowered to form a latent image. When the toner 9 packed in the developing container 8 is conveyed to the opposing surface of the photosensitive drum by the developing sleeve 7, the toner 9 charged to the same polarity as the charging polarity of the photosensitive drum in the developing container is exposed to the developing sleeve. An electric field applied between the drum cores carries and attaches to the low potential region of the latent image portion on the photosensitive drum. Next, the adhered toner is peeled off from the surface of the photosensitive drum by the high-voltage electric field applied to the transfer roller 10 and transferred to the surface of the recording paper 16.
【００３４】トナーを乗せられた転写材は次に定着ロー
ラ１４と加圧ローラ１６のニップ部へと搬送され、この
ニップ部でハロゲンヒータ１５からの熱とローラ間の圧
力によって画像を定着される。また、この間、転写後の
感光ドラム表面に転写されずに残った不要トナーはクリ
ーニングブレード１２によって感光ドラム表面から掻き
落とされ、廃トナー容器１１中に回収される。また、ク
リーニングブレードの下部や現像スリーブの下部にはト
ナー漏れを防ぐためにトナー漏れ防止シート１７が設け
られている。The transfer material carrying the toner is then conveyed to the nip portion between the fixing roller 14 and the pressure roller 16, and the image is fixed in the nip portion by the heat from the halogen heater 15 and the pressure between the rollers. . During this time, the unnecessary toner left untransferred on the surface of the photosensitive drum after the transfer is scraped off from the surface of the photosensitive drum by the cleaning blade 12 and collected in the waste toner container 11. A toner leakage prevention sheet 17 is provided below the cleaning blade and the developing sleeve to prevent toner leakage.
【００３５】上記の装置により、飛び散りや白斑点状跡
のない良好な画像が初期、耐久後とも得られた。With the above apparatus, good images free of scattering and white spots were obtained both at the initial stage and after the endurance.
【００３６】［実施例２］本実施例は、実施例１と異な
り、図１０で帯電ローラ５に、芯金の周りに１０ 6 Ωの
抵抗を有する導電性ウレタンゴム層を形成したものを用
いた構成とし、線圧０．０１〜０．２ｋｇ／ｃｍの圧力
で感光ドラムに圧接させた。[Second Embodiment] This embodiment is different from the first embodiment.
Then, in FIG. 6 Ω
Uses a conductive urethane rubber layer with resistance
The linear pressure is 0.01 to 0.2 kg / cm
It was pressed against the photosensitive drum.
【００３７】なお、この導電性ウレタンゴム層の抵抗値
は、導電性ウレタンゴム層の表面１ｃｍ2 当たりの芯金
から導電性ウレタンゴム層の表面までの抵抗値を表す。
また、実施例１と同様の形状の仮芯金を用いて、所定の
抵抗を有する帯電ローラを得たものである。The resistance value of the conductive urethane rubber layer represents the resistance value from the metal core to the surface of the conductive urethane rubber layer per cm 2 of the surface of the conductive urethane rubber layer.
Further, a charging roller having a predetermined resistance was obtained by using a temporary metal core having the same shape as that of Example 1.
【００３８】本実施例の帯電ローラを使用することによ
り、感光ドラム表面に均一な帯電が可能となり、ムラの
ない良好な画像が得られた。By using the charging roller of this embodiment, the surface of the photosensitive drum can be uniformly charged, and a good image without unevenness can be obtained.
【００３９】［実施例３］本実施例は、実施例１と異な
り、圧力を加えると逆に抵抗が下がる材料を使用して発
泡弾性体層を形成する場合であり、この場合は図８のよ
うなクラウン形状の仮芯金１０３を用い、実施例１と同
様にして転写ローラを製造した。実施例１と同様にして
評価した結果、飛び散りや白斑点状跡のない良好な画像
が初期、耐久後とも得られた。[Third Embodiment] This embodiment is different from the first embodiment in that the elastic foam layer is formed by using a material whose resistance decreases when pressure is applied. In this case, as shown in FIG. A transfer roller was manufactured in the same manner as in Example 1 using the crown-shaped temporary core metal 103. As a result of evaluation in the same manner as in Example 1, a good image free of scattering and white spots was obtained both at the initial stage and after the durability test.
【００４０】［実施例４］逆クラウン形状の仮芯金を用
いる代わりに、図９のような中央部に向かって折れ線状
に細くなっている形状の仮芯金１０４を用いた以外は、
実施例１と同様にして転写ローラを製造した。実施例１
と同様にして評価した結果、飛び散りや白斑点状跡のな
い良好な画像が初期、耐久後とも得られた。[Embodiment 4] Instead of using a temporary core metal having an inverted crown shape, a temporary core metal 104 having a shape that is thin in a polygonal shape toward the center as shown in FIG. 9 is used.
A transfer roller was manufactured in the same manner as in Example 1. Example 1
As a result of evaluation in the same manner as above, a good image without scattering and white spots was obtained both in the initial stage and after the durability test.
【００４１】[0041]
【発明の効果】本発明によれば、帯電したトナーを保持
した像担持体との対向部に、転写材を挟持搬送しながら
転写材の裏面に転写バイアスを印加して転写材上にトナ
ーを転写させる転写ローラを有する画像形成装置におい
て、転写ローラを像担持体に押し当てた時に転写ローラ
の端部が高抵抗化する問題点を解決し、より広い抵抗範
囲の転写ローラの使用を可能とすることで、転写ローラ
の製造歩留りを上げて供給量を増やし、コストダウンを
図ることができる。また、帯電ローラでも軸方向で同じ
ような抵抗分布が発生することがあるが、これと同様に
解決できる。According to the present invention, a transfer bias is applied to the back surface of the transfer material while the transfer material is nipped and conveyed at a portion facing the image carrier that holds the charged toner to transfer the toner onto the transfer material. In an image forming apparatus having a transfer roller for transferring, the problem that the end portion of the transfer roller has a high resistance when the transfer roller is pressed against the image carrier is solved, and a transfer roller having a wider resistance range can be used. By doing so, the manufacturing yield of the transfer roller can be increased, the supply amount can be increased, and the cost can be reduced. Further, even in the charging roller, a similar resistance distribution may occur in the axial direction, but the same problem can be solved.
【００４２】最終製品の芯金をクラウン形状や逆クラウ
ン形状や他の形状にしても、本発明と同様に軸方向の抵
抗分布を所望の分布にすることが可能であるが、ストレ
ート形状より加工賃が高くなるためコストダウンは難し
い。本発明では、高価な仮芯金でも製造工程で何回も使
うことにより、コストダウンを図ることができる。Even if the core metal of the final product is formed into a crown shape, an inverted crown shape or any other shape, it is possible to obtain a desired resistance distribution in the axial direction as in the present invention. Cost reduction is difficult because wages increase. In the present invention, cost reduction can be achieved by using an expensive temporary core bar many times in the manufacturing process.
【図１】実施例１における転写ローラの製造方法の概略
フローチャート図。FIG. 1 is a schematic flowchart of a method of manufacturing a transfer roller according to a first exemplary embodiment.
【図２】実施例１で製造した転写ローラの抵抗分布。2 is a resistance distribution of the transfer roller manufactured in Example 1. FIG.
【図３】従来の転写ローラの抵抗分布とニップの説明
図。FIG. 3 is an explanatory diagram of a resistance distribution and a nip of a conventional transfer roller.
【図４】転写ローラの軸方向の抵抗分布測定装置。FIG. 4 is a resistance distribution measuring device in the axial direction of the transfer roller.
【図５】転写ローラの軸方向の抵抗分布測定装置。FIG. 5 is a resistance distribution measuring device in the axial direction of the transfer roller.
【図６】転写ローラの荷重と転写電流の関係図。FIG. 6 is a relationship diagram of a load of a transfer roller and a transfer current.
【図７】実施例１の製造途中の転写ローラと仮芯金の
図。FIG. 7 is a diagram of a transfer roller and a temporary core in the process of manufacturing in Example 1.
【図８】実施例３の製造途中の転写ローラと仮芯金の
図。FIG. 8 is a diagram of a transfer roller and a temporary core in the process of manufacturing in Example 3.
【図９】実施例４の製造途中の転写ローラと仮芯金の
図。FIG. 9 is a diagram of a transfer roller and a temporary core in the course of manufacturing of Example 4.
【図１０】レーザ方式ページプリンターの概略縦断面
図。FIG. 10 is a schematic vertical sectional view of a laser system page printer.
【図１１】押し出し成形機の概略縦断面図。FIG. 11 is a schematic vertical sectional view of an extrusion molding machine.
１ レーザーダイオード ２ ポリゴンミラー ３ レンズ ４ 折り返しミラー ５ 帯電ローラ ６ 感光ドラム ７ 現像スリーブ ８ 現像容器 ９ トナー １０ 転写ローラ １０ａ 転写ローラ １０１，１０３，１０４ 転写ローラ芯金 １０２ ゴム １０６ 絶縁ドラム １１ 廃トナー容器 １２ クリーニングブレード １３ 転写材 １４ 定着ローラ １５ ハロゲンヒータ １６ 加圧ローラ １７ トナー漏れ防止部材 １８ 軸受け １９ ステンレス板 １０８ ホッパー 1 Laser Diode 2 Polygon Mirror 3 Lens 4 Folding Mirror 5 Charging Roller 6 Photosensitive Drum 7 Developing Sleeve 8 Developing Container 9 Toner 10 Transfer Roller 10a Transfer Roller 101, 103, 104 Transfer Roller Core 102 Rubber 106 Insulating Drum 11 Waste Toner Container 12 Cleaning blade 13 Transfer material 14 Fixing roller 15 Halogen heater 16 Pressure roller 17 Toner leak prevention member 18 Bearing 19 Stainless steel plate 108 Hopper
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 105:24 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location B29K 105: 24
Claims (1)
抗値１０5 Ω・ｃｍ〜１０10Ω・ｃｍの半導電性弾性体
層を有する半導電性弾性ローラの製造方法において、加
硫発泡前のチューブ状弾性体の内部に、径が中央部より
端部の方が漸次大きい形状あるいは径が中央部より端部
の方が漸次小さい形状の仮芯金を挿入して加硫発泡し、
その後該仮芯金を取外し、略ストレート形状の芯金を挿
入することを特徴とする半導電性弾性ローラの製造方
法。1. A method for producing a semiconductive elastic roller having a cored bar and a semiconductive elastic layer having a volume resistance value of at least 10 5 Ω · cm to 10 10 Ω · cm around the cored bar. Inside the former tubular elastic body, insert a temporary core metal having a shape in which the diameter of the end is gradually larger than that of the central portion or a shape in which the diameter of the end is gradually smaller than the central portion, and vulcanized and foamed.
After that, the temporary core metal is removed, and a substantially straight core metal is inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32292295A JPH09160401A (en) | 1995-12-12 | 1995-12-12 | Production of semiconductive elastic roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32292295A JPH09160401A (en) | 1995-12-12 | 1995-12-12 | Production of semiconductive elastic roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09160401A true JPH09160401A (en) | 1997-06-20 |
Family
ID=18149135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32292295A Pending JPH09160401A (en) | 1995-12-12 | 1995-12-12 | Production of semiconductive elastic roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09160401A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834479B1 (en) * | 2005-10-11 | 2008-06-05 | 미쓰비시덴키 가부시키가이샤 | Method for manufacturing element substrate and supporting apparatus for the substrate |
| JP2010164821A (en) * | 2009-01-16 | 2010-07-29 | Casio Electronics Co Ltd | Image forming apparatus |
-
1995
- 1995-12-12 JP JP32292295A patent/JPH09160401A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834479B1 (en) * | 2005-10-11 | 2008-06-05 | 미쓰비시덴키 가부시키가이샤 | Method for manufacturing element substrate and supporting apparatus for the substrate |
| JP2010164821A (en) * | 2009-01-16 | 2010-07-29 | Casio Electronics Co Ltd | Image forming apparatus |
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