JPS6138966A - Photosensitive drum for electronic copying machine - Google Patents

Photosensitive drum for electronic copying machine

Info

Publication number
JPS6138966A
JPS6138966A JP6785884A JP6785884A JPS6138966A JP S6138966 A JPS6138966 A JP S6138966A JP 6785884 A JP6785884 A JP 6785884A JP 6785884 A JP6785884 A JP 6785884A JP S6138966 A JPS6138966 A JP S6138966A
Authority
JP
Japan
Prior art keywords
drum
photosensitive drum
cooling air
cylinder
rims
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
Application number
JP6785884A
Other languages
Japanese (ja)
Other versions
JPH0123783B2 (en
Inventor
Yoichi Sato
洋一 佐藤
Ryo Hashimoto
涼 橋本
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.)
Altemira Co Ltd
Original Assignee
Showa Aluminum Corp
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 Showa Aluminum Corp filed Critical Showa Aluminum Corp
Priority to JP6785884A priority Critical patent/JPS6138966A/en
Publication of JPS6138966A publication Critical patent/JPS6138966A/en
Publication of JPH0123783B2 publication Critical patent/JPH0123783B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/75Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/751Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to drum

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Abstract

PURPOSE:To improve heat radiation, to reduce a surface temperature uniformly and sufficiently over the whole length, to prevent a photosensitive drum from the generation of troubles such as overheat at the long continuous use of the drum by inserting heat radiation fins having specific structures between radical rims arranged between an inner cylinder for a bearing and a drum body. CONSTITUTION:The inner cylinder 2 for the bearing and the outer cylinder 1 forming the drum body are concentrically and unitedly molded through plural radical coupling rims 3 arranged between the inner and outer cylinders 1, 2 and one or plural band-like heat radiation fins 4 are radically inserted between the rims 3 arranged between the inner and outer cylinders 1, 2 in the axial direction. Louver parts 4b-4e obtained by arranging plural cut and projected parts 7 in parallel in the sectional direction are formed at least a part of each fin 4 in the longitudinal direction and the efficiency of heat exchange with cooling air is gradually increased in the direction from one end of the drum on the cooling air inflow side to the other end in accordance with the existence of louver parts 4b-4e, the angle of the cut and projected parts and the gradual change of the number of projected parts. Such a kind of drum has high heat radiation, even if the outer cylinder is heated by corona discharge or the irradiation of lamp, radiates heat immediately so as to be prevented from overheat. The surface temperature is uniformly held in the longitudinal direction, so that the drum can be used stably and continuously for a long period.

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 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7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、7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る。
(Prior Art) Conventionally, this type of photosensitive drum uses a hollow cylinder made of metal such as aluminum and having a photosensitive layer formed on its outer peripheral surface. In order to rotationally support this, a pair of separately formed 7-lunge members are applied to both ends of the cylinder,
These are fastened with a plurality of fastening bolts to be integrated with the cylinder, and are removably supported on the drum shaft via bearings such as ball bearings attached to the seven flange members.

(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は、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. Not only does this complicate the structure and increase costs, but it also helps if the cylinder needs to be replaced due to fatigue or damage to the photoconductor.
It has the disadvantage that it requires a complicated procedure for attachment and detachment, 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2、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 through a separate flange and a bearing. Sometimes the center does not exactly match the center of the drum shaft over the entire length, which can have various negative 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、それに伴って感光ド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よって熱せられるのに加えて、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
ような従来の感光ドラムでは、放熱性が悪いために、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ト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 drums 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, in cases where the photosensitive drum is heated by a corona discharger or a lamp, and in addition a heating fixing roll is placed closely around the circumference,
On the other hand, the conventional photosensitive drums described above have poor heat dissipation properties, which combined with the tendency for surface area to decrease due to miniaturization of the drum itself.
Problems arise in that the drum tends to overheat, the charging performance of the photoreceptor is significantly reduced, or the toner melts on the drum surface, impeding good transfer to copy paper.

このような問題点に対して、ドラムの放熱性を上げるた
めに、そのシリンダ内面に放熱フィンとして作用する凸
条を一体形成する提案が既になされている(例えば特開
昭54−103358号公報、実開昭56−12056
6号公報)が、このような一体成形フィンは、その数を
増すことに限度があり、所期するような感光ドラムの冷
却効果を実現しうるちのではなかった。
To solve these problems, in order to improve the heat dissipation performance of the drum, proposals have already been made to integrally form protrusions that act as heat dissipation fins on the inner surface of the cylinder (for example, Japanese Patent Application Laid-Open No. 103358/1983, Utsukai Showa 56-12056
However, there is a limit to the number of integrally molded fins that can be increased, and it has not been possible to achieve the desired cooling effect on the photosensitive drum.

(発明の目的) この発明は、上記のような諸問題の解決をはかることを
目的とする。即ち、第1には感光ドラムの放熱性を顕著
に増大せしめ、例えば加熱定着ロールを周面の一部に接
触せしめたような場合にも、回転によって静電潜像を形
成せしめる帯電部に至るまでの過程で表面温度を充分に
下降せしめうるようなものどなすこと、また、第2には
、ドラムの一端から風を送り込んで冷却を促進する場合
に、ドラムの長さ方向の一端部と他端部との間で温度勾
配を生ずることなく、表面温度を全長にわたって可及的
均一に低下せしめうるちのとなすこと、更に第3にはド
ラム軸への支承構造を簡素化し、その脱着操作を容易に
行いうるちのとすると共に、ドラムの中心をドラム軸の
中心に正確に合致せしめることができ、回転中心に狂い
、誤差を生じるおそれのないようなものとすること等を
目的とする。
(Purpose of the invention) The purpose of the invention is to solve the problems mentioned above. That is, firstly, the heat dissipation of the photosensitive drum is significantly increased, and even when a heating fixing roll is brought into contact with a part of the circumferential surface, the rotation leads to a charging section that forms an electrostatic latent image. Second, when blowing air from one end of the drum to promote cooling, one end of the length of the drum must be Thirdly, the support structure for the drum shaft is simplified, and its attachment/detachment operation is simplified. To easily perform the rotation, and to make it possible to accurately align the center of a drum with the center of a drum shaft without causing a risk of deviation from the rotation center and causing an error.

(問題点を解決するための手段) 上記の目的を達成するために、この発明は、感光層の支
持体としてのドラム胴ないしはシリンダとなる外筒の内
部に、軸受となる管状の内筒を、複数個の放射状連結リ
ムを介して一体成形したものとすることにより、前記内
筒にドラム軸を挿通して簡単かつ正確にドラムの回転支
承を可能なものとし、かつドラムの脱着も容易に行いう
るちのとする。また上記内外両筒間に、放射状配置に、
かつ軸線方向に沿って複数個の金属薄板からなる帯状の
フィンを挿入し、かつこれを内外両筒に、または少なく
とも外筒内面に接合固定することにより、ドラムの一端
側からファンによって強制空冷を促す手段との併用によ
って、充分な放熱促進効果が得られるようにする。更に
は、上記放熱フィンに、ルーバー加工を施したものを用
い、しかもその冷却空気との熱交換効率が冷却空気入口
側から出口側に向って順次大となるようにルーバー部形
態を変化させたものとすることにより、ドラムの長さ方
向における表面温度の温度温度勾配を少なくするように
したものである。
(Means for Solving the Problems) In order to achieve the above object, the present invention includes a tubular inner cylinder serving as a bearing inside an outer cylinder serving as a drum body or cylinder as a support for a photosensitive layer. By integrally molding a plurality of radial connecting rims, the drum shaft can be inserted into the inner cylinder to easily and accurately support the rotation of the drum, and the drum can be easily attached and detached. I will do it with Uruchino. In addition, between the above-mentioned inner and outer cylinders, radially arranged,
By inserting band-shaped fins made of a plurality of thin metal plates along the axial direction and joining and fixing them to both the inner and outer cylinders, or at least to the inner surface of the outer cylinder, forced air cooling is performed by a fan from one end of the drum. A sufficient heat dissipation promoting effect can be obtained by using it in combination with a promoting means. Furthermore, we used louvered fins for the heat dissipation fins, and changed the shape of the louvers so that the efficiency of heat exchange with the cooling air gradually increases from the cooling air inlet side to the outlet side. By doing so, the temperature gradient of the surface temperature in the longitudinal direction of the drum is reduced.

即ち、この発明は、軸受用内筒と、ドラム胴を形成する
外筒とが複数個の放射状連結リムを介して同心に一体成
形されるとともに、上記内外両筒間に、隣接する各放射
状連結リム間の位置において、それぞれゴないし複数枚
の帯状放熱フィンが軸線方向に沿って放射状配置に挿入
されると共に、上記放熱フィンは、長さ方向の少なくと
も一部に横断方向に複数個の切起こし部を並設したルー
バー部を有し、かつ該ルーバー部の有無、前記切起こし
部の角度または個数の漸次的変化により、ドラムの冷却
空気流入側の一端から他端な至るに従って冷却空気との
熱交換効率が漸次段階的ないし連続的に増大するように
形成されてなることを特徴とする電子複写機用感光ドラ
ムを要旨とする。
That is, in this invention, the inner cylinder for a bearing and the outer cylinder forming the drum body are integrally molded concentrically via a plurality of radial connection rims, and each adjacent radial connection rim is formed between the inner and outer cylinders. At a position between the rims, one or more band-shaped heat dissipating fins are inserted in a radial arrangement along the axial direction, and each of the heat dissipating fins has a plurality of cut and raised parts in the transverse direction in at least a part of its length. The drum has a louver part in which the parts are arranged in parallel, and the presence or absence of the louver part, and gradual changes in the angle or number of the cut and raised parts, improve the relationship between the cooling air and the cooling air from one end of the drum to the other end on the cooling air inflow side of the drum. The object of the present invention is to provide a photosensitive drum for an electronic copying machine, which is formed so that heat exchange efficiency increases stepwise or continuously.

(実施例) 以下、この発明の実施例を図面に基づいて詳しく説明す
る。
(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

第1図および第2図において、(1)は表面に感光層が
形成されるドラム胴としての外筒であり、(2)はこれ
の内部に同心に設けられた軸受用の内筒である。これら
両筒(1)(2)は複数本の放射状連結リム(3)によ
って相互に一体的に連結されている。このような内外二
重筒からなる成形体は、例えばアルミニウム合金の押出
し成形により、容易に製作することができるものである
。なお、特に外筒(1)は、強度、重量、放熱性等の関
係で、肉厚を2〜4M程度に形成するのが有利である。
In Figures 1 and 2, (1) is an outer cylinder as a drum cylinder on which a photosensitive layer is formed, and (2) is an inner cylinder for a bearing provided concentrically inside this. . These two cylinders (1) and (2) are integrally connected to each other by a plurality of radial connecting rims (3). Such a molded body consisting of an inner and outer double cylinder can be easily manufactured by extrusion molding of an aluminum alloy, for example. In particular, it is advantageous for the outer cylinder (1) to have a wall thickness of about 2 to 4M in terms of strength, weight, heat dissipation, etc.

また、図示実施例において、放射状連結リム(3)は、
等間隔に6個設けたものを示したが、2個以上であれば
何個設けても良く、一般的には8個程度までの範囲で任
意に設定される。
In the illustrated embodiment, the radial connecting rim (3) also includes:
Although six pieces are provided at equal intervals in the example shown, any number of pieces may be provided as long as it is two or more, and generally, the number is arbitrarily set within the range of about eight pieces.

上記内外両筒(2)(1)間には、隣接する放射状連結
リム(3)(3)間の位置においてそれぞれ複数枚の金
属薄板からなる帯状の放熱フィン(4)が軸線方向に沿
って放射状配置に挿入され、かつ内外両筒に両側縁部を
接合一体化されている。この放熱フィン(4)の挿入操
作を容易化し、かつその位置決めを正しく行うために、
゛内外両筒(2)(1)には対向状にそれ′ぞれ多数条
の細溝(5)(6)が設けられており、これらに放熱フ
ィン(4)の両側縁部がはめ込まれたものとなされてい
る。また、放熱フィン(4)の固定は、例えばこれにア
ルミニウムプレージングシートを用いることにより、そ
の皮材(ろう材)を溶融せしめて両側縁部を外筒(1)
及び内筒(2)にろう付は接合することにより行うのが
最も簡易であり一般的である。実施例もこのような手法
で放熱フィンの接合固定が行われているものである。
Between the above-mentioned inner and outer cylinders (2) (1), band-shaped heat dissipation fins (4) made of a plurality of metal thin plates are installed along the axial direction at positions between the adjacent radial connecting rims (3) (3). It is inserted in a radial arrangement, and both side edges are joined and integrated with both the inner and outer cylinders. In order to facilitate the insertion operation of this radiation fin (4) and to correctly position it,
``The inner and outer cylinders (2) and (1) are provided with a large number of thin grooves (5) and (6) facing each other, into which both side edges of the radiation fins (4) are fitted. It is considered to be a good thing. In addition, the radiation fins (4) can be fixed by using an aluminum plating sheet, for example, by melting the skin material (brazing material) and fixing both side edges to the outer cylinder (1).
It is easiest and most common to braze the inner cylinder (2) by joining. In this embodiment, the heat dissipation fins are also bonded and fixed using this method.

ところで、上記の放熱フィン(4)は、第3図に示すよ
うに、一端側の所定距離に亘る平板状部(4a)を除い
て、他端に至るまでの領域には、横断方向に多数個の切
起こし部(7)を並設した複数個のルーバー部(4b)
  (4C)  (4d)(4e)が設けられている。
By the way, as shown in FIG. 3, the above-mentioned heat dissipation fin (4) has a large number of fins in the transverse direction in the area up to the other end, except for the flat plate part (4a) extending over a predetermined distance at one end. A plurality of louver parts (4b) in which cut and raised parts (7) are arranged in parallel
(4C) (4d) (4e) are provided.

しかも該ルーバー部は、第4図に示すように隣接するも
のにおいて切起こし部〈7)の方向が互いに逆向きに形
成されると共に、上記他端に近い位置に存するものほど
、切起こし部(7)の切起こし角度が大きいものとなさ
れている。そして、この放熱フィン(4)が、前記平板
状部(4a)側の一端を、第1図に示すようにドラムの
一端に臨−んで配置される冷却用ファン(8)からの冷
却空気流入側の一端に位置せしめて前記のように挿入設
置されることにより、該冷却空気流入側の一端から他端
に至るに°従って、上記放熱フィン(4)による冷却空
気との熱交換効率が漸次段階的に増大せられるものとな
されている。
Moreover, as shown in FIG. 4, the directions of the cut and raised portions (7) of the adjacent louver portions are opposite to each other, and the closer the louver portions are to the other end, the more the cut and raised portions (7) are formed. 7) The cutting and raising angle is made large. The heat dissipation fins (4) have one end on the flat plate portion (4a) side facing one end of the drum, as shown in FIG. By being inserted and installed as described above at one end of the side, the efficiency of heat exchange with the cooling air by the radiation fins (4) gradually increases from one end of the cooling air inflow side to the other end. It is assumed that the amount will be increased in stages.

もつとも、この発明に用いる放熱フィン〈4)は、上記
のように冷却空気流入側から同流出側に向って漸次段階
的ないし連続的に冷却空気との熱交換効率が増大するよ
うにルーバー部を形成したものであれば良く、実施例の
具体的形態に限定されるものではない。従って例えば、
放熱フィンの全長にわたってルーバー部を連続的に形成
し、その切起こし部(7)の角度あるいは個数を漸次変
化させることによって上記の作用を実現せしめるものと
することも許容される。
However, the heat dissipation fins <4) used in the present invention have louvered parts so that the efficiency of heat exchange with the cooling air increases gradually or continuously from the cooling air inflow side to the cooling air outflow side as described above. It may be any shape as long as it is formed, and is not limited to the specific form of the embodiment. Therefore, for example,
It is also permissible to achieve the above effect by continuously forming the louver portion over the entire length of the heat dissipation fin and gradually changing the angle or number of the cut and raised portions (7).

(発明の効果) この発明に係る感光ドラムは、前述のような構成を有す
るものであるから、実施例の参酌によっても明らかなで
あるように、内筒(2)にドラム軸(図示略)を挿通す
ることによってこれを複写機内に容易に軸支しうる。従
って、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せしめることが可能で、構
造の大幅な簡略化をはかりうる。かつ内外筒が一体成形
物であることによって、内筒(2)に通したドラム軸に
対して外筒(1)の中心が自動的に正確に一致されるた
め、この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、あるいは転写紙ガイド等に接触して、こ
れら若しくはドラム表面の感光層を傷付ける等の問題を
防ぐことができる。
(Effects of the Invention) Since the photosensitive drum according to the present invention has the above-described configuration, as is clear from consideration of the examples, the inner cylinder (2) is provided with a drum shaft (not shown). This can be easily pivoted into a copying machine by inserting it. Therefore, unlike conventional products, it is possible to provide rotational support without requiring additional accessories such as a flange body or bearing, and the structure can be significantly simplified. In addition, since the inner and outer cylinders are integrally molded, the center of the outer cylinder (1) is automatically and accurately aligned with the drum shaft that passes through the inner cylinder (2), so that the outer cylinder (1) can be placed close to the photosensitive drum. It is possible to prevent problems such as damage to the photosensitive layer on the surface of the drum due to contact with the corona discharger group, developing device, transfer paper guide, etc. arranged therein.

また、外筒(1)の内側には多数の薄い放熱フィン(4
)を有するのに加えて、内筒(2)と連結する放射状連
結リム(3)も放熱作用を実現するため、放熱性に優れ
ており、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筒が熟せられても、速やかに放熱し
て過熱現象を生じることがなく、ひいてはドラムの回転
スピードを上げることができる。殊に、第1図に示すよ
うに、ドラムの一端からファン(8)で風を送って強制
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
ーう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
なものとなる。
Also, inside the outer cylinder (1) there are many thin heat dissipation fins (4
), the radial connecting rim (3) connected to the inner cylinder (2) also achieves heat dissipation, so it has excellent heat dissipation properties and prevents discharge from the corona discharger and even light from the lamp. Even if the outer cylinder becomes ripe due to irradiation, the heat is quickly dissipated and overheating does not occur, which in turn allows the rotation speed of the drum to be increased. In particular, as shown in FIG. 1, by blowing air from one end of the drum with a fan (8) to perform forced air cooling, heat dissipation can be easily promoted. Even in cases where the transferred image on the transfer paper is fixed by heating and fixing rows on the surface, the temperature of the heated outer peripheral surface of the drum must be sufficiently raised to the required temperature before the heated outer peripheral surface of the drum reaches the charging section. This makes it possible to lower the temperature to a low temperature, which is extremely effective in further downsizing copying machines.

更に、上記ファン(8)による冷却促進作用において、
この発明によるドラムでは、放熱フィンが、長さ方向の
少なくとも一部に横断方向に複数個の切起こし部をil
]2設したルーバー部を有し、しかも該ルーバー部の有
無、前記切起こし部の角度または個数の漸次的変化によ
り、ドラムの冷却空気流入側の一端から他端に至るに従
って冷却空気との熱交換効率を漸次段階的ないし連続的
に増大するように形成されているから、ドラム軸の長さ
方向の全長に亘って放熱効率を略均−化することができ
る。従って、ドラムの一端側と他端側との間で表面温度
に大きな温度勾配を生ずることがなく全長に亘って常に
良好な作用を保持せしめることができる。
Furthermore, in the cooling promotion effect by the fan (8),
In the drum according to the present invention, the radiation fin has a plurality of cut and raised portions in the transverse direction in at least a portion of the length direction.
] It has two louver parts, and the presence or absence of the louver part, and gradual changes in the angle or number of the cut-and-raised parts, reduce heat exchange with the cooling air from one end of the cooling air inflow side of the drum to the other end. Since the exchange efficiency is formed to increase gradually or continuously, the heat dissipation efficiency can be approximately equalized over the entire length of the drum shaft. Therefore, there is no large temperature gradient in the surface temperature between one end and the other end of the drum, and good operation can be maintained over the entire length of the drum.

この発明は上述の次第で、極めて簡単な構成にして、感
光ドラムの正確な回転中心の設定配置を可能とし、偏心
回転等によるトラブルの発生の問題を回避しうるのはも
とより、感光ドラムの脱着操作も簡易に行いうるちのと
なしうる。
As described above, the present invention has an extremely simple structure, enables accurate setting and placement of the rotation center of the photosensitive drum, avoids troubles caused by eccentric rotation, etc., and also makes it possible to attach and detach the photosensitive drum. It is easy to operate and can be used as an Uruchino.

また、外筒に一体成形する場合には側底不可能であるよ
うな多数個の放熱フィンの設置が可能であり、放熱性能
に極めて優れたものとなしうろことによって、長時間の
連続使用によっても過熱によるトラブルを発生するおそ
れがなく、かつ全長に亘って略均整な表面温度に制御し
得て、良好な機能を保持すると共に、感光ドラム自体の
小型化に加えて、該ドラムの周りで転写紙上のトナーの
加熱定着を行わしめることにより定着機構の簡素化をは
かることを可能とすることも相俟って、複写機の小型化
に大きく貢献を果しうる顕著な効果を秦する。
In addition, when integrally molded into the outer cylinder, it is possible to install a large number of heat dissipation fins, which is not possible on the side bottom, resulting in extremely excellent heat dissipation performance. There is no risk of trouble caused by overheating, and the surface temperature can be controlled to be approximately even over the entire length, maintaining good functionality.In addition to downsizing the photosensitive drum itself, Coupled with the fact that it is possible to simplify the fixing mechanism by heating and fixing the toner on the transfer paper, this provides a remarkable effect that can greatly contribute to the miniaturization of copying machines.

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

図面はこの発明の実施例を示す一部切欠き斜視図、第2
図は第1図II−II線の断面図、第3図は放熱フィン
の平面図、第4図は第3図rV−■線の断面図で一部を
拡大して示したものである。 (1)・・・外筒、(2)・・・内筒、(3)・・・連
結リム、(4)・・・放熱フィン、(4a)・・・平板
状部、(4b) (4c) (4d) (4e)−・・
ルーバー部、(5)(6)・・・細溝、(7)・・・切
起こし部。 以  上 手続ネ甫正書(方式)       8゜昭和eo年9
月2日 昭和59年 特許願第67858号 2、発明の名称 電子複写機用感光ドラム 3、補正をする者 事件との関係 特許出願人 住所   堺市海山町6丁224番地 名称     昭和アルミニウム株式会社代表者 石 
井   親 4、代理人 住所   大阪市南区鰻谷中之町72−45、補正命令
の日付 昭和60年8月27日補正の内容 明細書第14頁第9行の[図面はJを「第1図は」と訂
正する。 以上
The drawings are partially cutaway perspective views showing embodiments of the present invention;
The figures are a cross-sectional view taken along the line II--II in FIG. 1, FIG. 3 is a plan view of the radiation fin, and FIG. 4 is a cross-sectional view taken along the line rV--■ in FIG. 3, partially enlarged. (1)...outer cylinder, (2)...inner cylinder, (3)...connecting rim, (4)...radiating fin, (4a)...flat plate-shaped part, (4b) ( 4c) (4d) (4e) ---
Louver part, (5) (6)... thin groove, (7)... cut and raised part. The above formal procedures (method) 8゜Showa Eo 9
Date of May 2, 1982 Patent Application No. 67858 2, Title of invention Photosensitive drum for electronic copying machine 3, Relationship to the case of the person making the amendment Patent applicant Address 6-224, Kaiyama-cho, Sakai City Name Representative of Showa Aluminum Co., Ltd. stone
Chika I 4, Agent Address: 72-45 Unagidani Nakano-cho, Minami-ku, Osaka, Date of Amendment Order: August 27, 1985 The figure is corrected. that's all

Claims (2)

【特許請求の範囲】[Claims] (1)軸受用内筒と、ドラム胴を形成する外筒とが複数
個の放射状連結リムを介して同心に一体成形されるとと
もに、上記内外両筒間に、隣接する各放射状連結リム間
の位置において、それぞれ1ないし複数枚の帯状放熱フ
ィンが軸線方向に沿って放射状配置に挿入されると共に
、上記放熱フィンは、長さ方向の少なくとも一部に横断
方向に複数個の切起こし部を並設したルーバー部を有し
、かつ該ルーバー部の有無、前記切起こし部の角度また
は個数の漸次的変化により、ドラムの冷却空気流入側の
一端から他端な至るに従って冷却空気との熱交換効率が
漸次段階的ないし連続的に増大するように形成されてな
ることを特徴とする電子複写機用感光ドラム。
(1) The inner cylinder for the bearing and the outer cylinder forming the drum body are integrally molded concentrically via a plurality of radial connecting rims, and between the above-mentioned inner and outer cylinders, and between the adjacent radial connecting rims. At each position, one or more strip-shaped heat dissipation fins are inserted in a radial arrangement along the axial direction, and each of the heat dissipation fins has a plurality of cut and raised portions lined up in the transverse direction in at least a portion of its length. The heat exchange efficiency with the cooling air increases from one end of the cooling air inflow side of the drum to the other end by gradually changing the presence or absence of the louver part and the angle or number of the cut and raised parts. 1. A photosensitive drum for an electronic copying machine, characterized in that the photosensitive drum is formed such that the amount increases gradually or continuously.
(2)フィンが内外両筒に対向状に形成された細溝に両
側縁をはめ込まれ、かつろう付けにより該内外両筒に接
合されてなる特許請求の範囲第1項記載の電子複写機用
感光ドラム。
(2) An electronic copying machine according to claim 1, wherein the fins have both side edges fitted into thin grooves formed oppositely in both the inner and outer cylinders, and are joined to the inner and outer cylinders by brazing. photosensitive drum.
JP6785884A 1984-04-04 1984-04-04 Photosensitive drum for electronic copying machine Granted JPS6138966A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6785884A JPS6138966A (en) 1984-04-04 1984-04-04 Photosensitive drum for electronic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6785884A JPS6138966A (en) 1984-04-04 1984-04-04 Photosensitive drum for electronic copying machine

Publications (2)

Publication Number Publication Date
JPS6138966A true JPS6138966A (en) 1986-02-25
JPH0123783B2 JPH0123783B2 (en) 1989-05-08

Family

ID=13357055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6785884A Granted JPS6138966A (en) 1984-04-04 1984-04-04 Photosensitive drum for electronic copying machine

Country Status (1)

Country Link
JP (1) JPS6138966A (en)

Also Published As

Publication number Publication date
JPH0123783B2 (en) 1989-05-08

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