JPH0123782B2 - - Google Patents
Info
- Publication number
- JPH0123782B2 JPH0123782B2 JP6465484A JP6465484A JPH0123782B2 JP H0123782 B2 JPH0123782 B2 JP H0123782B2 JP 6465484 A JP6465484 A JP 6465484A JP 6465484 A JP6465484 A JP 6465484A JP H0123782 B2 JPH0123782 B2 JP H0123782B2
- Authority
- JP
- Japan
- Prior art keywords
- drum
- cylinder
- fins
- corrugated
- fin
- 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.)
- Expired
Links
- 238000001816 cooling Methods 0.000 claims description 16
- 239000011295 pitch Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000217377 Amblema plicata Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
- G03G15/751—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to drum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
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 rotatably support this, a pair of separately formed flange members is applied to both ends of the cylinder, and these are fastened with a plurality of fastening bolts to integrate with the cylinder, and a ball attached to the flange member is attached. It is designed to be removably supported on the drum shaft via a bearing such as a bearing.
（従来技術の問題点）
従つて、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、損傷等によつてシリン
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 conventional technology) Therefore, in the conventional photosensitive drum as described above,
In addition to the cylinder, a pair of flanges, bearings, etc. are required to support the cylinder, which increases the number of parts, complicates the structure, and increases costs. When it becomes necessary to replace the cylinder due to damage or the like, it has the disadvantage that a complicated procedure is required to attach and detach 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つてシリンダの中心が
ドラム軸の中心に全長にわたつて厳密に合致しな
いことが起こり、複写機能上に種々の悪影響を及
ぼすことがあつた。 In addition, in the rotational support of the photosensitive drum, the cylinder is supported on the drum shaft through a separate flange and bearing, so the cylinder may be damaged due to the accumulation of errors between each member. The center of the drum did not match exactly with the center of the drum shaft over the entire length, which had 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、それに伴つて感光ドラムも
小さくなりつつある。加えて、感光ドラムによつ
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つ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つて、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 the image is transferred to the transfer paper by the photosensitive drum, the heating and fixing operation of the developed image electrostatically adhered to the transfer paper is performed around the photosensitive drum, thereby providing a separate fixing section. Attempts have also been made to reduce case space. However, when 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, the temperature of the photosensitive drum tends to increase. On the other hand, with the conventional photosensitive drum as mentioned above,
Due to poor heat dissipation, coupled with the tendency for surface area to decrease due to miniaturization, the drum tends to overheat, which significantly reduces the charging performance of the photoreceptor.
Alternatively, problems arise in that the toner melts on the drum surface and prevents 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インと
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56−120566号公報）が、このような一体成形フ
インは、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もの
ではなかつた。 To solve this problem, 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, However, there is a limit to the number of such integrally molded fins that can be increased, and the desired cooling effect of the photosensitive drum cannot be achieved.
（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、回転によつ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
うるようなものとなすこと、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つ
て可及的均一に低下せしめうるものとなすこと、
また、第３には、製作を可及的簡易に行いうるも
のとなすこと、更に第４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
ものとすると共に、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, a charging section that significantly increases the heat dissipation of the photosensitive drum and forms an electrostatic latent image by rotation even when a heating fixing roll is brought into contact with a part of the circumferential surface, for example. Second, when blowing air from one end of the drum to promote cooling,
To reduce the surface temperature as uniformly as possible over the entire length of the drum without creating a temperature gradient between one end and the other end in the length direction of the drum;
Thirdly, the production should be as simple as possible, and fourthly, the supporting structure for the drum shaft should be simplified so that it can be easily attached and detached. It is an object of the present invention to provide a drum that can accurately align the center of the drum with the center of the drum shaft, and that there is no risk of deviation from the center of rotation and errors.
（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ブ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もの
とする。また上記内外両筒間に軸線方向に沿つて
コルゲートフインを挿入し設置することにより、
ドラムの一端側からフアンによつて強制空冷を促
す手段との併用によつて、充分な放熱促進効果が
得られるようにする。更には、上記コルゲートフ
インに、波数ないしは山数の相互に異なる複数種
類のものを用いることにより、ドラムの冷却空気
流入側の一端から他端に至るに従つて漸次段階的
にフインピツチを密に構成し、ドラムの長さ方向
における表面温度の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 ribs, 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 use it. In addition, by inserting and installing corrugated fins along the axial direction between the above-mentioned inner and outer cylinders,
To obtain a sufficient heat dissipation promoting effect by combined use with a means for promoting forced air cooling using a fan from one end side of a drum. Furthermore, by using a plurality of types of corrugated fins with mutually different wave numbers or ridge numbers, the fin pitches can be formed to be gradually denser in stages from one end of the cooling air inlet side of the drum to the other end. However, the temperature gradient of the surface temperature in the length 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ブを介し
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ブ間の位置におい
て、横断面方向に波付けされたコルゲートフイン
であつて波数を相互に異にした複数種類のコルゲ
ートフインが、その高さ方向の両頂端面を前記内
外両筒の外周面及び内周面に当接せしめる状態に
して軸線方向に順次挿入され、かつ上記当接部を
一体的に接合固定されることにより、ドラムの冷
却空気流入側の一端から他端に至るに従つて漸次
段階的にフインピツチが密に構成されてなること
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 connecting ribs, and each adjacent radial connecting cylinder is connected between the inner and outer cylinders. At the position between the ribs, a plurality of types of corrugated fins with corrugated waves in the cross-sectional direction and having different wave numbers are arranged such that both top end surfaces in the height direction are aligned with the outer circumferential surfaces of the inner and outer cylinders. By sequentially inserting the drum in the axial direction so as to make it contact with the inner peripheral surface, and by integrally joining and fixing the above-mentioned abutting parts, the cooling air is gradually inserted from one end to the other end on the cooling air inlet side of the drum. The object of the present invention is to provide a photosensitive drum for an electronic copying machine, characterized in that fin pitches are arranged densely in stages.
（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
ブ３によつて相互に一体的に連結されている。こ
のような内外両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
〜４mm程度に形成するのが有利である。また、図
示実施例において、放射状連結リブ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 FIGS. 1 and 2, 1 is an outer cylinder as a drum cylinder on which a photosensitive layer is formed;
is an inner cylinder for a bearing provided concentrically inside this. Both cylinders 1 and 2 are integrally connected to each other by a plurality of radial connecting ribs 3. Such a molded body consisting of both inner and outer double cylinders can be easily manufactured by extrusion molding of an aluminum alloy, for example. In particular, the outer cylinder 1 has a wall thickness of 2 mm due to strength, weight, heat dissipation, etc.
It is advantageous to form it to about 4 mm. Further, in the illustrated embodiment, six radial connecting ribs 3 are provided at equal intervals, but any number of radial connecting ribs 3 may be provided as long as it is two or more, and generally up to about eight. Set arbitrarily.
上記内外両筒２，１間には、隣接する放射状連
結リブ３，３間の位置において、それぞれコルゲ
ートフイン４が軸線方向に一端から挿入されかつ
接合固定されている。該コルゲートフイン４は、
内外両筒２，１間の距離、即ち連結リブ３の高さ
に対応する波付け高さをもつて横断面方向に波付
けされたものであり、従つて上記の挿入設置状態
において両頂端面４ａ，４ａがそれぞれ内筒２の
外面及び外筒１の内面に当接せられている。そし
て、この当接部を内外両筒２，１に一対的に接合
されている。この接合は、コルゲートフイン４に
アルミニウムブレーシ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にろう付け接合することに
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コルゲートフインの接合固
定が行われているものである。 Between the inner and outer cylinders 2, 1, corrugated fins 4 are inserted from one end in the axial direction at positions between adjacent radial connecting ribs 3, 3, and are fixedly joined. The corrugated fin 4 is
It is corrugated in the cross-sectional direction with a corrugation height corresponding to the distance between the inner and outer cylinders 2, 1, that is, the height of the connecting rib 3, and therefore, in the above-mentioned inserted and installed state, both top end surfaces 4a, 4a are brought into contact with the outer surface of the inner tube 2 and the inner surface of the outer tube 1, respectively. This contact portion is joined to both the inner and outer cylinders 2 and 1 in a pair. This joining is best done by using an aluminum bracing sheet for the corrugated fin 4, melting the skin material (brazing material), and brazing the both side edges to the outer cylinder 1 and inner cylinder 2. It is simple and common. In this embodiment, the corrugated fins are also joined and fixed using this method.
ところで、上記コルゲートフイン４は、互い波
数ないし山数を異にした複数種類のものを含む。
即ち、図示実施例では、いずれもドラムの全長を
略３等分した長さ第１〜第３フイン４Ａ，４Ｂ，
４Ｃを有し、第１フイン４Ａは、山数が１つだけ
の幅の狭いものとなされ、第２フイン４Ｂは、２
つの山数を有するものとなされ、更に第３フイン
４Ｃは、３つの山数を有するものとなされてい
る。そして、これらの第１〜第３フインが、各連
結リブ３，３間の位置にそれぞれ軸線方向に沿つ
て外筒１の一端から順次挿入設置されている。従
つて、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アン７からの冷却空気流入側
の一端部から、同出口側の他端部に至るに従つ
て、コルゲートフイン４のピツチは段階的に漸次
密に構成されたものとなされている。即ち、第２
図ないし第４図に示すように、ドラムの全長のう
ち、上記一端側の約1/3程度の長さ範囲では、第
４図に示すように第１フイン４Ａが存在して、内
外両筒１，２間に各２枚の放射状放熱板部４ｂを
形成した疎なフインピツチとなされ、中間部の約
１／３程度の長さ範囲では、第３図に示すように第
２フイン４Ｂが存在して４枚の放射状放熱板部４
ｂを形成したものとなされ、更に他端側の約1/3
程度の長さ範囲に至ると、第２図に示すように第
３フイン４Ｃが存在して６枚の放射状放熱板部４
ｂを形成した密なフインピツチに構成されてい
る。 By the way, the corrugated fins 4 include a plurality of types having different wave numbers or crest numbers.
That is, in the illustrated embodiment, each of the first to third fins 4A, 4B,
4C, the first fin 4A has a narrow width with only one fin, and the second fin 4B has a width of 2.
Further, the third fin 4C has three ridges. These first to third fins are inserted and installed in sequence from one end of the outer cylinder 1 along the axial direction at positions between the connecting ribs 3 and 3, respectively. Therefore, as shown in FIG. 1, the corrugated fins 4 extend from one end on the inflow side of the cooling air from the cooling fan 7 arranged facing one end of the drum to the other end on the outlet side. The pitches are made progressively denser. That is, the second
As shown in FIGS. 4 to 4, in a length range of about 1/3 of the above-mentioned one end side of the total length of the drum, a first fin 4A exists as shown in FIG. A sparse fin pitch is formed in which two radial heat dissipating plate parts 4b are formed between 1 and 2, and a second fin 4B is present in a length range of about 1/3 of the middle part, as shown in Fig. 3. and four radial heat sink parts 4
b, and approximately 1/3 of the other end
When the length reaches a certain length range, as shown in FIG.
It is composed of a dense fin pitch forming a b.
なお、殊に第３フイン４Ｃは、第５図に示され
るような挿入前の材料としてのコルゲートフイン
４が、その幅Ｗを内筒２側においては狭められ、
外筒１側においては拡張されて、横断面略扇形に
変形された状態にして内外両筒２，１間に挿入設
置されたものとなされている。 In particular, in the third fin 4C, the width W of the corrugated fin 4 as a material before insertion as shown in FIG. 5 is narrowed on the inner cylinder 2 side,
The outer cylinder 1 side is expanded and deformed into a substantially fan-shaped cross section, and is inserted between the inner and outer cylinders 2 and 1.
上記のような波数を異にしたフインの配列状態
は、実施例に限定されるものではない。従つて例
えば波数を異にした２種類のフインのみが用いら
れることもあるし、４種類以上のものが用いられ
ることもある。かつ冷却空気流入側の一端部に
は、放熱フインを全く設けないものとすることも
ある。これらの事項は、ドラムの使用条件との関
係で設計的に適宜に決められるものである。 The arrangement of fins with different wave numbers as described above is not limited to the embodiment. Therefore, for example, only two types of fins with different wave numbers may be used, or four or more types may be used. In some cases, no heat dissipation fins are provided at one end on the cooling air inflow side. These matters are determined appropriately from a design standpoint in relation to the usage conditions of the drum.
なお、図示実施例のコルゲートフイン４は、そ
の放熱部４ｂがいずれも平板状であるものとして
示したが、放熱効率を更に向上させる目的で、放
熱板部４ｂに更に横断面方向あるいは長さ方向に
波付けを施したものとか、あるいはルーパー状に
多数の切起し部を形成したもの等を用いることも
推奨される。 Although the corrugated fin 4 of the illustrated embodiment is shown as having a flat heat dissipation section 4b, in order to further improve the heat dissipation efficiency, the heat dissipation plate section 4b is further provided with a plate in the cross-sectional direction or length direction. It is also recommended to use a material with corrugated edges or a material with many cut and raised portions formed in a looper shape.
（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、実施例の参酌によつ
ても明らかであるように、内筒２にドラム軸（図
示略）を挿通することによつてこれを複写機内に
容易に軸支しうる。従つて、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
ることによつて、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, a drum shaft (not shown) is attached to the inner cylinder 2. By inserting it, it can be easily pivoted into a copying machine. Therefore, unlike conventional products, it is possible to provide rotational support without requiring additional accessories such as a flange body or a bearing, and the structure can be greatly simplified. In addition, since the inner and outer cylinders are integrally molded, the center of the outer cylinder 1 is automatically and precisely aligned with the drum shaft passed 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, the developing device, or the transfer paper guide.
また、外筒１の内側にはこれに接触してコルゲ
ートフイン４の薄い放熱板部４ｂが存在するのに
加えて、内筒２と連結する放射状連結リブ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熱せられても、速やかに放熱
して過熱現象を生じることがなく、ドラムの回転
スピードを上げて高速化をはかることができる。
殊に、第１図に示すように、ドラムの一端からフ
イン７で風を送つて強制空冷を行うことにより、
放熱作用を愈々促進でき、従つてこのような場合
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、これによつ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。 Furthermore, in addition to the thin heat dissipation plate portion 4b of the corrugated fin 4 existing inside the outer cylinder 1 in contact with this, the radial connecting ribs 3 connected to the inner cylinder 2 also achieve a heat dissipation effect. Even if the outer cylinder is heated by discharge from a corona discharger or by light irradiation from a lamp, it quickly radiates heat without causing overheating, increasing the rotation speed of the drum. You can increase the speed by using
In particular, as shown in FIG. 1, by blowing air from one end of the drum with fins 7 to perform forced air cooling,
The heat dissipation effect can be easily promoted, and therefore, in such cases, even when the transferred image is fixed on the transfer paper by a heated fixing roller on the circumferential surface of the photosensitive drum, the heated drum This makes it possible to sufficiently lower the temperature of the outer peripheral surface to a required low temperature before the outer peripheral surface reaches the charging section, which is extremely effective in further downsizing the copying machine. .
更に、放熱用のフアンとして特にコルゲートフ
インが用いられ、その両頂端面を内外筒面に当接
させているので、それらの接触面積が大きくで
き、放熱効率を愈々増大しうるのはもちろん、内
外両筒２，１間へのフインの挿入設置作業も、各
連結リブ３，３間にコルゲートフインを個々に挿
入するだけで、放射状に位置する複数個の放熱板
部を一度に設けることができると共に、放熱板部
の数すなわちフインピツチも使用するコルゲート
フインの波付数の選択によつて任意に変えること
が可能で製造上有利である。 Furthermore, corrugated fins are particularly used as heat dissipation fans, and their top end surfaces are brought into contact with the inner and outer cylindrical surfaces, so the contact area between them can be increased, and the heat dissipation efficiency can be greatly increased. The work of inserting and installing the fins between the two cylinders 2 and 1 is as simple as inserting corrugated fins individually between each connecting rib 3 and 3, and multiple heat dissipation plate sections located radially can be installed at once. In addition, the number of heat dissipating plate parts, that is, the fin pitch, can be arbitrarily changed by selecting the number of corrugations of the corrugated fins used, which is advantageous in manufacturing.
上記フアン７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、放熱用のコルゲートフ
インに互いに波数を異にした複数種類のものを含
むことによつて、ドラムの冷却空気流入側の一端
から他端に至るに従つて漸次段階的にフインピツ
チが密に構成されたものとなされているから、ド
ラム軸の長さ方向の全長に亘つて放熱効率を略均
一化することができる。従つて、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つて常に均整な作用を保
持せしめることができる。 In the cooling promotion effect by the fan 7, in the drum according to the present invention, the corrugated fins for heat dissipation include a plurality of types of corrugated fins having different wave numbers, so that the cooling air flows from one end of the drum to the other end on the cooling air inflow side. Since the fin pitches are gradually made denser as they reach the drum shaft, the heat dissipation efficiency can be made substantially uniform over the entire length of the drum shaft in the longitudinal direction. Therefore, a large temperature gradient does not occur in the surface temperature between one end and the other end of the drum, and a uniform action can always be maintained over the entire length.
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ものとなしうる。また、外
筒に一体成形する場合には到底不可能であるよう
な多数個の放熱フイ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ることによつ
て、長時間の連続使用によつても過熱によるトラ
ブルを発生するおそれがなく、かつ全長に亘つて
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つて、複写機の
小型化に大きく貢献を果しうる顕著な効果を奏す
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 can also be easily operated. In addition, it is possible to install a large number of heat dissipation fins, which would be impossible if they were integrally molded into the outer cylinder, and the heat dissipation performance is extremely excellent, allowing continuous use for long periods of time. There is no risk of trouble caused by overheating even when the drum is heated, and the surface temperature can be controlled to be approximately uniform over the entire length, maintaining good functionality.In addition to reducing the size of 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 around the transfer paper, this has a remarkable effect that can greatly contribute to the miniaturization of copying machines. .
第１図はこの発明の実施例を示す一部切欠き斜
視図、第２図ないし第４図は第１図−線、
−線および−線の各断面図、第５図はコル
ゲートフイン（第３フイン）の挿入設置前の状態
を示す斜視図である。
１……外筒、２……内筒、３……連結リブ、４
……コルゲートフイン、４Ａ……第１フイン、４
Ｂ……第２フイン、４Ｃ……第３フイン、７……
冷却用フアン。
FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, and FIGS. 2 to 4 are along the line of FIG.
- and - line sectional views, and FIG. 5 is a perspective view showing the state before insertion and installation of the corrugated fin (third fin). 1... Outer cylinder, 2... Inner cylinder, 3... Connecting rib, 4
...Corrugated fin, 4A...1st fin, 4
B...2nd fin, 4C...3rd fin, 7...
Cooling fan.
Claims (1)
複数個の放射状連結リブ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
放射状連結リブ間の位置において、横断面方向に
波付けされたコルゲートフインであつて波数を相
互に異にした複数種類のコルゲートフインが、そ
の高さ方向の両頂端面を前記内外両筒の外周面及
び内周面に当接せしめる状態にして軸線方向に順
次挿入され、かつ上記当接部を一体的に接合固定
されることにより、ドラムの冷却空気流入側の一
端から他端に至るに従つて漸次段階的にフインピ
ツチが密に構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。 ２ コルゲートフインにアルミニウムブレーシン
グシートが用いられ、その皮材によつて該フイン
が前記内外両筒にろう付け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。[Scope of Claims] 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 ribs, and each adjacent radial cylinder is formed between the inner and outer cylinders. At the positions between the connecting ribs, a plurality of types of corrugated fins with corrugated waves in the cross-sectional direction and having different wave numbers are arranged such that both top end surfaces in the height direction are connected to the outer circumferential surfaces of the inner and outer cylinders. and are sequentially inserted in the axial direction so as to be in contact with the inner circumferential surface, and the abutting portions are integrally joined and fixed, so that the cooling air inlet side of the drum is inserted from one end to the other end on the cooling air inlet side. A photosensitive drum for an electronic copying machine, characterized in that fin pitches are gradually arranged densely. 2. The photosensitive drum for an electronic copying machine according to claim 1, wherein an aluminum bracing sheet is used for the corrugated fins, and the fins are brazed to both the inner and outer cylinders using the skin material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6465484A JPS6138963A (en) | 1984-03-30 | 1984-03-30 | Photosensitive drum for electronic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6465484A JPS6138963A (en) | 1984-03-30 | 1984-03-30 | Photosensitive drum for electronic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6138963A JPS6138963A (en) | 1986-02-25 |
| JPH0123782B2 true JPH0123782B2 (en) | 1989-05-08 |
Family
ID=13264429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6465484A Granted JPS6138963A (en) | 1984-03-30 | 1984-03-30 | Photosensitive drum for electronic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6138963A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09161391A (en) * | 1995-12-07 | 1997-06-20 | Nec Corp | Magnetic disk device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6365706U (en) * | 1986-10-21 | 1988-04-30 | ||
| JPH0739054U (en) * | 1994-10-31 | 1995-07-14 | 三田工業株式会社 | Photoconductor drum |
| US5788382A (en) * | 1997-08-28 | 1998-08-04 | Output Technology, Inc. | Imaging drum |
| EP1156401A3 (en) * | 2000-05-17 | 2004-05-06 | NexPress Solutions LLC | Apparatus for positioning a cylindrical sleeve on a carrier body |
| JP6661887B2 (en) * | 2015-03-16 | 2020-03-11 | 富士ゼロックス株式会社 | Support member, image carrier, image forming apparatus |
-
1984
- 1984-03-30 JP JP6465484A patent/JPS6138963A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09161391A (en) * | 1995-12-07 | 1997-06-20 | Nec Corp | Magnetic disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6138963A (en) | 1986-02-25 |
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