JPS60218684A - Production of photosensitive drum for electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To simplify the supporting structure to a drum shaft to make attaching and detaching operations easy by producing a photosensitive drum easily. CONSTITUTION:An inner wheel body 2 where plural radially extending radiation fins 4 are formed as one body on the outside peripheral face of a bearing internal cylinder 3 in the axial direction is formed by press and molding. A cylindrical outer wheel body 1 is formed which has such inside diameter that the inner wheel body 2 can be fitted to this outer wheel body 1, and these wheel bodies are fitted to each other and are combined into one body. As a one-body combining means, the inner wheel body 2 and the outer wheel body 1 are subjected to the drawing work in the state where the former is fitted into the latter, and the outer wheel body has the diameter reduced to join them into one body closely. Otherwise, a solder layer 5a is formed preliminarily on the inside face of the outer wheel body 1a by coating, and they are fitted to each other, and thereafter, they are heated at a temperature higher than the melting point of the solder material in each process to join them into one body.

Description

【発明の詳細な説明】 （産業上の利用分野） この発明は電子写真法を適用した電子複写機に用いられ
る静電感光ドラム、更に詳しくは外周面に透明絶縁層を
被覆した感光層を有する導電性支持体からなるドラム状
感光体の製造方法に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to an electrostatic photosensitive drum used in an electronic copying machine applying electrophotography, and more specifically, to an electrostatic photosensitive drum having a photosensitive layer whose outer peripheral surface is coated with a transparent insulating layer. The present invention relates to a method for manufacturing a drum-shaped photoreceptor made of a conductive support.

（従来の技術〉 従来、この種の感光ドラムは、外周面に感光層を形成し
たアルミニウム等の金属からなる中空のシリンダが用い
られている。そしてこれを回転支承するために、該シリ
ンダの両端に別途形成した１対のフランジ部材を当て、
これらを複数本の締結ボルトで締結して前記シリンダと
一体化するとともに、フランジ部材に取付けたボールベ
アリング等の軸受を介して、ドラム軸に着脱自在に軸支
せしめるものとなされていた。(Prior Art) Conventionally, this type of photosensitive drum uses a hollow cylinder made of metal such as aluminum with a photosensitive layer formed on its outer circumferential surface.In order to rotatably support this, both ends of the cylinder are used. A pair of separately formed flange members is applied to the
These are integrated with the cylinder by fastening them with a plurality of fastening bolts, and are removably supported on the drum shaft via a bearing such as a ball bearing attached to a flange member.

（従来技術の問題点） 従って、上記のような従来の感光ドラムで（よ、シリン
ダのほかに、これを軸支するために１対のフランジ、軸
受等を別途に必要とするため、部品点数が増し、構造が
複雑化してコスト高につくのみならず、感光体の疲労、
損傷等によってシリンダを交換する必要を生じた場合に
、その脱着に煩雑な手順を必要として多くの手間がかか
る欠点を有していた。(Problems with the prior art) Therefore, in the conventional photosensitive drum as described above, in addition to the cylinder, a pair of flanges, bearings, etc. are separately required to support the drum, which increases the number of parts. This not only increases the complexity of the structure and increases costs, but also increases the fatigue of the photoconductor.
When it becomes necessary to replace the cylinder due to damage or the like, it has the disadvantage that a complicated procedure is required for attaching and detaching the cylinder, which requires a lot of effort.

また、感光ドラムの回転支承においても、シリンダをこ
れとは別体であるフランジ部、軸受を介してドラム軸に
軸支するものであるため、各部材相互間での誤差の累積
によってシリンダの中心がドラム軸の中心に全長にわた
って厳密に合致しないことが起こり、複写機能上に種々
の悪影響を及ぼすことがあった。In addition, in the rotational support of the photosensitive drum, the cylinder is supported on the drum shaft via a separate flange and bearing, so the center of the cylinder may be distorted due to the accumulation of errors between each member. Sometimes the center of the drum does not exactly match the center of the drum shaft over its entire length, which can have various adverse effects on the copying function.

更にまた、近年、電子複写機の小型化の要請は益々強い
ものがあり、それに伴って感光１−′ラムも小さくなり
つつある。加えて、感光ドラムによって転写紙に画像を
転写したのち、該転写紙上に静電付着した顕画像の加熱
定着操作を、感光ドラムの周りで行うものとすることに
より、定着部を別に設ける場合のスペースを削減しよう
とする試みもなされている。しかるに、感光ドラムは、
コロナ放電器やランプににって熱せられるのに加え−Ｃ
１周面に加熱定着ロールが密接配置されるような場合に
は、益々その温度が上昇される傾向を示すのに対し、前
記のＪ：うな従来の感光ドラムでは、放熱性が悲いため
に、それ自体の小型化による表面積の減少傾向とも相俟
って、ドラムに過熱現象を生じ易く、感光体の帯電性能
が著しく低下し、あるいはドラム表面で１〜ナーが溶融
して複写紙への良好な転写を阻害するというような問題
点が生じている。Furthermore, in recent years, there has been an increasingly strong demand for miniaturization of electronic copying machines, and accordingly, photosensitive 1-' rams are also becoming smaller. In addition, after an image is transferred to a transfer paper by a photosensitive drum, the heating and fixing operation of the developed image electrostatically adhered to the transfer paper is performed around the photosensitive drum, which makes it easier to install a fixing section separately. Attempts have also been made to reduce space. However, the photosensitive drum
In addition to being heated by a corona discharger or lamp -C
When heat-fixing rolls are closely arranged around one circumferential surface, the temperature tends to increase even more, whereas in the conventional photosensitive drum mentioned above, heat dissipation is poor. Coupled with the tendency for the surface area to decrease due to miniaturization, the drum tends to overheat, resulting in a significant drop in the charging performance of the photoreceptor, or melting of the toner on the drum surface, resulting in poor transfer to copy paper. Problems have arisen, such as inhibition of transcription.

（発明の目的） この発明は、上記の諸問題を解消しうるＪ：うな感光ド
ラムを簡易に製造しうる方法を提供しようとＪるもので
ある。即ち、ドラム軸への支承構造を簡素化でき、着脱
操作を容易になしうると共に、回転精度、真円度の精度
に優れ、かつ放熱性にも優れたものとなしうる感光ドラ
ムの簡易な製造方法を提供しようとするものである。(Object of the Invention) The present invention aims to provide a method for easily manufacturing a photosensitive drum that can solve the above-mentioned problems. That is, it is possible to easily manufacture a photosensitive drum that can simplify the support structure for the drum shaft, facilitate attachment and detachment operations, and have excellent rotational accuracy and roundness accuracy, as well as excellent heat dissipation. It is intended to provide a method.

（問題点を解決するための手段） この発明は、上記の目的達成のために、押出し成形によ
り、軸受内筒の外周面に複数の放射状にのびた放熱フィ
ンが軸線方向に沿って一体に形成された内輪体を製作す
る一方、この内輪体に被嵌しうる内径を有する円筒状の
外輪体を別途製作し、両者を嵌め合わせた状態にして一
体的に組合わせることを主要部とするものであって、上
記一体重組合わせ手段として、内輪体を外輪体に嵌め合
わせた状態にして引抜きカロエを施すことにより、外輪
体を縮径して内輪体に密接一体化せしめるか、あるいは
また、外輪体の内面に予めろう＠層を被覆形成したもの
とし、上記嵌め合わせ後、引抜き加工を施づ一力）また
【ま施さないで、上記ろう材の融点以上に加熱して内外
両輪体を接合一体化する手段を採用することを特徴とす
る電子複写機用感光ドラムの製造方法を提供するもので
ある。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of radially extending heat dissipating fins that are integrally formed along the axial direction on the outer peripheral surface of the bearing inner cylinder by extrusion molding. The main part is to manufacture a cylindrical outer ring body having an inner diameter that can be fitted into the inner ring body, and to separately manufacture a cylindrical outer ring body having an inner diameter that can be fitted into the inner ring body, and to assemble the two integrally by fitting them together. As the above-mentioned unitary combination means, the inner ring body is fitted into the outer ring body, and the outer ring body is pulled out and curled, thereby reducing the diameter of the outer ring body and closely integrated with the inner ring body, or alternatively, the outer ring body is A brazing layer is preliminarily formed on the inner surface of the brazing material, and after the above-mentioned fitting, the inner and outer wheels are joined together by being heated to a temperature above the melting point of the brazing material. The present invention provides a method for manufacturing a photosensitive drum for an electronic copying machine, which is characterized in that it employs a means for converting the photosensitive drum into an electronic copying machine.

（実施例） 以下、この発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.

第１図および第２図は、この発明の方法によって製造さ
れる感光ドラムの一例を示すしのであって、（１）は表
面に感光層が形成されるシリンダとしての外輪体、（２
）はその内部に挿入されかつ一体的に組合わされた内輪
体であって、外輪体〈１）と同心に位置する軸受用の内
ｉｉＭ　（３）と、これの外周面から放射状にのびた多
数の放熱フィン（４）とからなる。1 and 2 show an example of a photosensitive drum manufactured by the method of the present invention, in which (1) is an outer ring body as a cylinder on which a photosensitive layer is formed;
) is an inner ring body that is inserted into the inner ring body and combined integrally with the outer ring body (1), and a bearing inner ring (iiM (3)) located concentrically with the outer ring body (1), and a large number of radially extending from the outer circumferential surface of this inner ring body (3). It consists of a heat radiation fin (4).

上記外輪体（１）は、アルミニウム合金をもって円筒状
に押出し成形したのち、引抜き加工を施すことによって
、所要の直径の高粕疫な円筒状に形成されるものであり
、内径が内輪体（２）の外径、即ち放熱フィン（４）の
先端を結ぶ円の直径より僅かに大きいか同じ程度に形成
されるものである。The outer ring body (1) is formed by extruding an aluminum alloy into a cylindrical shape and then drawing it into a cylindrical shape with a desired diameter and high lees content. ), that is, the diameter of the circle connecting the tips of the heat dissipating fins (4).

一方、内輪体（２）は、アルミニウム合金による押出し
成形により、軸受内筒（３）と、その軸線方向に沿った
複数の放熱フィン（４）とを一体に形成したものである
。On the other hand, the inner ring body (2) is formed by extrusion molding of an aluminum alloy to integrally form a bearing inner cylinder (3) and a plurality of heat dissipating fins (4) along the axial direction of the bearing inner cylinder (3).

而して、この発明に係る感光ドラムの製造法は、上記の
ような内輪体（２）と外輪体（１〉をそれぞれ別途に製
作したのち、第３図に示すようにそれらを互いに嵌め合
わせ、然る後それらを一体化するものである。この一体
化の方法としては、次の２つの方法が択一的にある０は
組合わぼにおいて採用される。Therefore, the method for manufacturing a photosensitive drum according to the present invention involves separately manufacturing the inner ring body (2) and outer ring body (1) as described above, and then fitting them together as shown in FIG. , and then integrate them.As the method of this integration, the following two methods are alternatively adopted in the combination work.

即ち、その１つの方法は、予め外輪体（１）の内径を内
輪体（２）の外径より僅かに大きめに形成したものとし
、両者を嵌め合わせたのち、所謂合わせ引きと称される
ような引扱き加工を施すことにより、第４図に示すよう
に外輪体（１）を僅かに縮径せしめ、その内面に内輪体
（２）の放熱フィン（４）の先端を強く密接せしめるこ
とによって両者と一体的に組合わせるものである。That is, one method is to form the inner diameter of the outer ring body (1) in advance to be slightly larger than the outer diameter of the inner ring body (2), fit them together, and then pull the outer ring body (1) together. As shown in Fig. 4, the diameter of the outer ring body (1) is slightly reduced by carrying out a handling process, and the tips of the heat dissipating fins (4) of the inner ring body (2) are tightly brought into close contact with the inner surface of the outer ring body (1). It is a combination of both.

また、他の１つの方法は、外輪体（１）として予めその
内面にろう材層（５）を被嵌形成せしめたものに製作し
、これを内輪体に１■め合わυたのら、上記ろう材層の
融点以上に加熱してろう付けを施すことにより、外輪体
（１）と内輪体（２）とを接合一体化するものである。Another method is to manufacture an outer ring body (1) with a brazing material layer (5) fitted onto its inner surface in advance, fit this to the inner ring body once, and then The outer ring body (1) and the inner ring body (2) are joined and integrated by performing brazing by heating to a temperature higher than the melting point of the brazing material layer.

第２図において（５ａ）はこのろう付りににるフィレッ
ト部を示す。In FIG. 2, (5a) shows the fillet portion to be joined by this brazing.

なお、上配ろう付けによる場合においても、その前に予
め前記第１の方法と同じく合わせ引きを施して内外両輪
体（１）（２＞を密接ぜしめておくものとすることが望
ましい。また、外輪体〈１）はその内面に、内輪体（２
）の放熱フィン（４）の先端部が嵌まり込むＪ：うな案
内溝を段【プたものとすることも望ましい。In addition, even in the case of top brazing, it is desirable that the inner and outer wheels (1) (2>) be tightly tightened by applying a mating process in advance in the same manner as in the first method. The outer ring body (1) has an inner ring body (2
) It is also desirable to have a stepped guide groove into which the tip of the heat dissipation fin (4) fits.

また、図示実施例では、内輪体（２）の放熱フィン（４
）をいずれも平板状のままで外輪体（１）に組合わせる
場合を示したが、放熱効果を更に向上させる目的で、放
熱フィンく４）に適宜切込みを入れたり、長さ方向にね
じりを付与したり、幅方向に波状の変形を付与したり、
更には一部を切欠いた状態にして外輪体（１）と組合わ
せるものとしても良い。また隣接する放熱フィン間にお
いて、別途帯状あるいはコルゲート状、ルーバー状等の
放熱用フィンを付加的に挿入設置することも許容される
。In addition, in the illustrated embodiment, the heat dissipation fins (4) of the inner ring body (2) are
) are combined with the outer ring body (1) while remaining flat, but in order to further improve the heat dissipation effect, the heat dissipation fins 4) may be appropriately cut or twisted in the length direction. or add wavy deformation in the width direction,
Furthermore, it may be combined with the outer ring body (1) with a portion cut out. Further, it is also permissible to additionally insert and install additional heat dissipation fins in the form of a band, corrugate, or louver between adjacent heat dissipation fins.

（発明の効果） この発明によれば、前述のように、外輪体（１）の中心
部に、これと同心配置に内輪体く２）の軸受内筒（３）
が位置された感光ドラムを得ることができるから、該ド
ラムは上記内筒（３）にドラム軸を挿通することによっ
て複写機内に容易に軸支可能なものとなり、従来品のよ
うに別途フランジ体や軸受等の付属部品を要することな
く回転支承が可能なものとなし得て、支承構造の大幅な
簡略化をはかりうる。(Effects of the Invention) According to the present invention, as described above, the bearing inner cylinder (3) of the inner ring body (2) is located at the center of the outer ring body (1) and concentrically arranged therewith.
Since it is possible to obtain a photosensitive drum in which the drum is positioned, the drum can be easily supported in a copying machine by inserting the drum shaft into the inner cylinder (3), and unlike conventional products, a separate flange body is required. Rotation support can be achieved without the need for accessory parts such as bearings or bearings, and the support structure can be greatly simplified.

また、上記軸受内筒（３）は、その周面から放射状にの
びた複数の放熱フィン（４）を介して外輪体（１）の中
心部に保持されたものとなるから、内筒（３）に通した
ドラム軸に対して外輪体（１）の中心を常に正確に一致
せしめたものとすることができると共に、外輪体（１）
自体、引抜き加工によって高精度に仕上げることができ
、高い真円精度を出しうろことし相俟って、感光ドラム
の周りに近接配置されるコロナ放電器群、現像器、ある
いは転写紙カイト等との距離を正確に一定に保ち得るも
のとなＪ−ことができる。従って、不本意にドラムの周
面がそれらに接触するというようなトラブルの発生を完
全に回避しうる。Furthermore, since the bearing inner cylinder (3) is held at the center of the outer ring body (1) via a plurality of heat radiation fins (4) extending radially from its circumferential surface, the inner cylinder (3) The center of the outer ring body (1) can always be accurately aligned with the drum shaft passed through the drum shaft, and the outer ring body (1)
The product itself can be finished with high precision by drawing processing, and together with the scales and the high roundness precision, it is suitable for use with corona dischargers, developers, transfer paper kites, etc. that are placed close to the photosensitive drum. It is possible to keep the distance exactly constant. Therefore, the occurrence of troubles such as the peripheral surface of the drum inadvertently coming into contact with them can be completely avoided.

更に、この発明に係る方法は、内輪体（２）及び外輪体
（１）の製作から、それらを一体に組合わせて製品とす
るまでの工程のすべて、あるいはほとんどを、押出し、
引抜き、合わせ引きというような素管工程で行いうろこ
とから、特別な設備を要することな（、殊に長尺の感光
ドラムの製作にあっても容易にかつ能率的に行いつると
共に、真円度等の精度の高いドラムを簡単に製作提供し
うる。Furthermore, the method according to the present invention includes extrusion, all or most of the steps from manufacturing the inner ring body (2) and the outer ring body (1) to combining them into a product.
Because it is carried out in the raw tube process such as drawing and drawing, it does not require special equipment (especially when manufacturing long photosensitive drums, it can be easily and efficiently carried out, and it can also be done to ensure perfect roundness). To easily manufacture and provide a drum with high precision such as degree of accuracy.

また、外輪体（１）に対して、これとは別に、軸受内筒
（３）の周りに放熱フィン（７１）を備えた内輪体〈２
）を製作して、爾後的にそれらを組合わせるものである
から、全体を押出し等で一体成形するような場合には著
しく困難であるような多数個の放熱フィン（４）を備え
て、しかもそれらがすべて外輪体（１）の内面に良好な
伝熱接触状態を保って密接したものとなしうる。従って
、放熱性に優れた感光ドラムを得ることができ、コロナ
放電器による放電、更にはランプからの光の照射を受け
て外周面が熱せられても、速やかに放熱して過熱規象を
生じることがなく、ドラムの回転スピードを上げて高速
化をはかりうるちのとなすことができる。殊に、第１図
に示すように、ドラムの一端からファン（６）で屓を送
って強制空冷を行うことにより、放熱作用を愈々促進し
うるちのとなすことができ、従ってこのような場合には
、感光ドラムの周面で加熱定着ローラにより転写紙上の
転写画像の定着を行わしめるような場合においてさえ、
これによって加熱されたドラムの外周面部が帯電部に至
るまでに、該外面部分の温度を充分に所要の低い温度に
まで下げることが可能となり、ひいては複写機の一層の
小型化をはかるうえで非常に有効なものとなしつる。In addition, in addition to the outer ring body (1), an inner ring body <2
) and then combine them, so it has to be equipped with a large number of heat dissipating fins (4), which would be extremely difficult to integrally mold the whole thing by extrusion or the like. All of them can be brought into close contact with the inner surface of the outer ring body (1) while maintaining good heat transfer contact. Therefore, it is possible to obtain a photosensitive drum with excellent heat dissipation properties, and even if the outer peripheral surface is heated due to discharge from a corona discharger or even irradiation with light from a lamp, heat is dissipated quickly and an overheating phenomenon occurs. By increasing the rotation speed of the drum, it is possible to increase the rotation speed of the drum. In particular, as shown in Figure 1, by sending the waste from one end of the drum with a fan (6) to perform forced air cooling, the heat dissipation effect can be easily promoted. Even in cases where the transferred image on the transfer paper is fixed by a heated fixing roller on the circumferential surface of the photosensitive drum,
This makes it possible to lower the temperature of the heated outer peripheral surface of the drum to a sufficiently low temperature before it reaches the charging section, which is extremely helpful in further downsizing copiers. What is effective for this and the vine.

更にまた、外輪体（１〉と内輪体〈２）とをろう付けに
よって接合一体化する場合、予め外輪体（１）の内面に
被覆したろう材層（５〉をもって上記ろう付けを行うか
ら、長尺の感光ドラムにあっても簡単に確実なろう句り
を施すことができると共に、得られた感光ドラムは、長
期間の使用によってもガタ付きや共振の発生ずるおそれ
のない、かつ放熱性能も安定して優れたものとなる利点
がある。Furthermore, when the outer ring body (1) and the inner ring body (2) are joined together by brazing, the brazing is performed using a brazing material layer (5) that has been coated on the inner surface of the outer ring body (1) in advance. Not only can long photosensitive drums be easily and reliably soldered, the resulting photosensitive drums also have excellent heat dissipation performance without the risk of wobbling or resonance even after long-term use. It also has the advantage of being stable and excellent.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明によって製造しうる感光ドラムの一例
を示す斜視図、第２図は第１図ｎ−■線の断面図、第３
図は外輪体と内輪体を組合わせる前の状態の斜視図、第
４図は内外両輪体を嵌め合わせたのちろう付けを施′ｇ
前の状態の一部縦断面図である。 （１）・・・外輪体、（２）・・・内輪体、（３）・・
・軸受内筒、（４）・・・放熱フィン、（５）・・・ろ
う材層、（６）・・・ファン。 以　上 特許出願人　昭和アルミニウム株式会社代　理　人　弁
理士　清　水　久　義　櫻（ 第１図FIG. 1 is a perspective view showing an example of a photosensitive drum that can be manufactured according to the present invention, FIG. 2 is a sectional view taken along the line n-■ in FIG.
The figure is a perspective view of the outer ring and inner ring before they are assembled, and Figure 4 shows the inner and outer wheels fitted together and then brazed.
It is a partial vertical cross-sectional view of the previous state. (1)... Outer ring body, (2)... Inner ring body, (3)...
・Bearing inner cylinder, (4)...radiating fin, (5)...brazing metal layer, (6)...fan. Patent applicant Showa Aluminum Co., Ltd. Representative Patent attorney Hisayoshi Shimizu (Figure 1)

Claims (2)

【特許請求の範囲】[Claims] （１）　押出し成形により、軸受内筒の外周面に複数の
放射状にのびた放熱フィンが軸線方向に沿って一体に形
成された内輪体を製作する一方、この内輪体に被嵌しう
る内径を有する円筒状の外輪体を別途製作し、両者を嵌
め合わせた状態にして引抜き加工を施すことにより外輪
体を縮径して内輪体に密接一体化虻しめることを特徴と
する電子複写機用感光ドラムの製造方法。(1) By extrusion molding, an inner ring body is manufactured in which a plurality of radiating radiating fins are integrally formed on the outer peripheral surface of the inner cylinder of the bearing along the axial direction, and the inner ring body has an inner diameter that can be fitted into this inner ring body. A photosensitive drum for an electronic copying machine, characterized in that a cylindrical outer ring body is manufactured separately, the outer ring body is reduced in diameter by drawing the two parts together, and the outer ring body is closely integrated with the inner ring body. manufacturing method. （２）　押出し成形により、軸受内筒の外周面に複数の
放射状にのびた放熱フィンが軸線方向°　に沿って一体
に形成された内輪体を製作する一方、この内輪体に被嵌
しうる内径を有し、かつ内周面にろう材層を被覆形成し
た円筒状の外輪体を別途製作し、両者を嵌め合わせた状
態にしたのち、前記ろう材の融点以上に加熱して内外両
輪体をろう付は接合一体化することを特徴とする電子複
写機用感光ドラムの製造方法。(2) By extrusion molding, we manufactured an inner ring body in which a plurality of radially extending heat dissipating fins were integrally formed on the outer peripheral surface of the inner cylinder of the bearing along the axial direction. A cylindrical outer ring with a brazing metal layer coated on the inner circumferential surface is separately fabricated, and after the two are fitted together, the inner and outer rings are heated to a temperature higher than the melting point of the brazing metal to solder the inner and outer rings. Attached is a method for manufacturing a photosensitive drum for an electronic copying machine, which is characterized by integrally bonding.