JPH03192372A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH03192372A JPH03192372A JP1330995A JP33099589A JPH03192372A JP H03192372 A JPH03192372 A JP H03192372A JP 1330995 A JP1330995 A JP 1330995A JP 33099589 A JP33099589 A JP 33099589A JP H03192372 A JPH03192372 A JP H03192372A
- Authority
- JP
- Japan
- Prior art keywords
- gear
- drum
- toner
- image
- tooth
- 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
- 230000004888 barrier function Effects 0.000 claims abstract description 5
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、複写機やレーザプリンタ等の電子写真技術を
用いた画像形成装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming apparatus using electrophotographic technology, such as a copying machine or a laser printer.
（従来の技術）
第４図に情報処理システムの出力装置として用いられる
小型のレーザプリンタｌの構成を示すが、該レーザプリ
ンタｌは装置本体２に着脱自在に装着されたプロセスカ
ートリッジ３を備えており、該プロセスカートリッジ３
には像担持体である感光ドラム４と、その周辺に配設さ
れた帯電器５、現像器６、クリーナ７等の公知のプロセ
ス機器が内蔵されている。又、装置本体２の上部には、
レーザ光を照射及び走査するスキャナユニット８及びミ
ラー９が配置されており、帯電器５によって一様に帯電
された前記感光ドラム４上に所定の画像情報に対応した
潜像が形成され、該潜像が現像器６によって現像されて
トナー像となる。(Prior Art) FIG. 4 shows the configuration of a small laser printer l used as an output device of an information processing system. The process cartridge 3
The photosensitive drum 4, which is an image carrier, and known process equipment such as a charger 5, a developer 6, and a cleaner 7, which are arranged around the photosensitive drum 4, are built into the photosensitive drum 4. Also, on the top of the device main body 2,
A scanner unit 8 that irradiates and scans a laser beam and a mirror 9 are arranged, and a latent image corresponding to predetermined image information is formed on the photosensitive drum 4, which is uniformly charged by the charger 5. The image is developed by a developing device 6 to become a toner image.
一方、装置本体２の下方には、多数のシート材Ｓを収納
する給紙カセットｌＯが配置されており、該給紙カセッ
ト１０に臨んで給紙ローラ１１が配置されていて、給紙
カセットｌＯに収容された前記シート材Ｓは、給紙ロー
ラ１１によって１枚ずつレジストローラ１２に送られ、
該レジストローラ１２によってタイミングを合わされて
感光トラム４と転写帯電器１３との間に送られ、ここで
感光ドラム４上の前記トナー像の転写を受ける。そして
、トナー像を転写されたシート材Ｓは、搬送ベルトユニ
ット１４により定着器１５に送られ、そのトナー像を定
着されて装置本体２の外へ排出される。尚、シート材Ｓ
に転写されないで感光トラム４上に残ったトナーは前記
クリーナ７によって除去される。On the other hand, a paper feed cassette lO that stores a large number of sheet materials S is arranged below the main body 2 of the apparatus, and a paper feed roller 11 is arranged facing the paper feed cassette 10. The sheet materials S housed in are sent one by one to the registration rollers 12 by a paper feed roller 11,
The toner image is timed by the registration roller 12 and sent between the photosensitive drum 4 and the transfer charger 13, where the toner image on the photosensitive drum 4 is transferred. Then, the sheet material S onto which the toner image has been transferred is sent to the fixing device 15 by the conveyor belt unit 14, the toner image is fixed thereon, and the sheet material S is discharged out of the apparatus main body 2. In addition, sheet material S
The toner remaining on the photosensitive tram 4 without being transferred is removed by the cleaner 7.
ところで、レーザプロセス１にはシート材Ｓを排出する
２つの方式があって、シート材Ｓをフェースアップ、即
ち１画像面を上側にして排出する場合には、該シート材
Ｓはフェースアップ用排出ローラ１６からフェースアッ
プ用排出トレイ１７に排出され、シート材Ｓをフェース
ダウン、即ち、画像面を下側にしてページ順に排出する
場合には、シート材Ｓは上記フェースアップ用排出ロー
ラ１６から更にフラッパ等のシート搬送方向切換機構及
びシート材案内部材等を介して上方に案内されてその表
裏が反転せしめられ、フェースダウン用排出ローラ１８
からフェースダウン用排出トレイ１９に排出される。By the way, there are two methods for discharging the sheet material S in the laser process 1. When the sheet material S is discharged face-up, that is, with one image side facing upward, the sheet material S is discharged face-up. When the sheet material S is discharged from the roller 16 to the face-up discharge tray 17 and is discharged face-down, that is, in page order with the image side facing down, the sheet material S is further discharged from the face-up discharge roller 16. The sheet is guided upward through a sheet conveyance direction switching mechanism such as a flapper, a sheet material guide member, etc., and its front and back are reversed, and the face-down discharge roller 18
From there, it is discharged onto the face-down discharge tray 19.
尚、該レーザプリンタｌにおいて、ジャム処理やプロセ
スカートリッジ３の交換等のメンテナンスは１図中、二
点鎖線にて示すように、装置本体２上部２ａを下部２ｂ
に対して支軸Ｐを中心に上方に回動させて装置内部を開
放し、矢印Ａ方向から手を挿入して行なわれる。In addition, in the laser printer 1, maintenance such as jam removal and replacement of the process cartridge 3 is performed by moving the upper part 2a of the device main body 2 to the lower part 2b, as shown by the two-dot chain line in Figure 1.
This is done by rotating the device upward about the support shaft P to open the inside of the device, and then inserting the hand from the direction of arrow A.
ここで、前記感光ドラム４の駆動系の構成を第５図（ａ
）の斜視図及び同図（ｂ）の半裁断面図に基づいて説明
すると、感光ドラム４のドラムシリンダ２０の一端内径
部にはドラム駆動ギヤ２１か接着、圧入等によって結合
されており、ドラムギヤ２１にはドラム駆動ギヤ２２が
噛合している。そして、トラムギヤ２１はドラム駆動ギ
ヤ２２から駆動力を受けて回転し、これによって感光ド
ラム４が所定の方向に所定の速度で回転駆動せしめられ
る。Here, the structure of the drive system of the photosensitive drum 4 is shown in FIG.
) and the half-cut cross-sectional view of FIG. A drum drive gear 22 is meshed with the drum drive gear 22. The tram gear 21 receives a driving force from the drum drive gear 22 and rotates, thereby rotating the photosensitive drum 4 in a predetermined direction at a predetermined speed.
（発明が解決しようとする課題）
以上説明した一連の画像形成プロセスにおいて、トナー
の一部は空中に飛散したり、感光トラム４のドラムシリ
ンダ２０の軸方向両端部に流飛し、その一部はドラムギ
ヤ２１に達してその歯面に付着する。そして、このトラ
ムギヤ２１の歯面に付着したトナーは、ドラムギヤ２１
がドラム駆動ギヤ２２に噛み合うことによって第６図（
ａ）、（ｂ）に符号ｔにて示すようにトラムギヤ２１の
歯面に固着するため、ドラムギヤ２１とドラム駆動ギヤ
２２との噛み合いが不均一となり、前記スキャナユニッ
ト８から照射されたレーザ光による潜像の形成が正確に
行なえなくなるばかりか、潜像を正確にシート材Ｓに転
写することができなくなる０例えば、第７図（ａ）に示
すようにシート材Ｓに横線を等間隔で形成する場合。(Problems to be Solved by the Invention) In the series of image forming processes described above, some of the toner is scattered in the air, or is flown to both ends of the drum cylinder 20 of the photosensitive tram 4 in the axial direction. reaches the drum gear 21 and adheres to its tooth surface. The toner adhering to the tooth surface of the tram gear 21 is removed from the drum gear 21.
meshes with the drum drive gear 22, resulting in the
As shown by the symbol t in a) and (b), since it adheres to the tooth surface of the tram gear 21, the meshing between the drum gear 21 and the drum drive gear 22 becomes uneven, and the laser beam irradiated from the scanner unit 8 causes Not only will it not be possible to form a latent image accurately, but also it will not be possible to accurately transfer the latent image onto the sheet material S. For example, as shown in FIG. 7(a), horizontal lines may be formed at equal intervals on the sheet material S. If you do.
前述のようにドラムギヤ２１の歯面にトナーの固着があ
ると、同図（ｂ）に示すように横線にムラ（以下、ピッ
チムラと称す）ができてしまう。As described above, if toner adheres to the tooth surface of the drum gear 21, unevenness (hereinafter referred to as pitch unevenness) will occur in the horizontal line as shown in FIG. 2(b).
本発明は上記問題に鑑みてなされたもので、その目的と
する処は、ピッチムラの無い高質な画像を得ることがで
きる画像形成装置を提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide an image forming apparatus that can obtain high-quality images without pitch unevenness.
（課題を解決するための手段）
上記目的を達成すべく本発明は、電子写真技術を用いた
画像形成装置において、像担持体の像担持表面と、該像
担持体を回転駆動するギヤの歯面とが略直線状に連設さ
れないよう構成したことをその特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention provides an image forming apparatus using an electrophotographic technique, in which an image bearing surface of an image bearing member and teeth of a gear that rotationally drives the image bearing member are provided. The feature is that the surfaces are not connected in a substantially straight line.
（作用）
例えば、像担持体の像担持表面とギヤの歯面との間に障
壁を設ければ、像担持体の軸方向に流飛するトナー等の
現像剤のギヤへの侵入が障壁によって確実に阻止される
ため、現像剤のギヤ歯面への固着が防止され、像担持体
を駆動するギヤと該ギヤに噛合する別のギヤとの噛み合
いが均一となってピッチムラの無い高質な画像が安定し
て得られる。(Function) For example, if a barrier is provided between the image bearing surface of the image bearing member and the tooth surface of the gear, the barrier will prevent developer such as toner that is blown away in the axial direction of the image bearing member from entering the gear. As a result, the developer is prevented from sticking to the gear tooth surface, and the meshing between the gear that drives the image carrier and another gear that meshes with the gear becomes uniform, resulting in high-quality products with no pitch unevenness. Images can be stably obtained.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.
第１図（ａ）は本発明に係るレーザプリンタに用いられ
る感光ドラムの一端部の斜視図、同図（ｂ）は同半裁断
面図である。FIG. 1(a) is a perspective view of one end of a photosensitive drum used in a laser printer according to the present invention, and FIG. 1(b) is a half-cut sectional view of the same.
本発明に係るレーザプリンタは第４図に示す従来のレー
ザプリンタ１と同様の基本構成を有しているが、本実施
例では、感光トラム４の端部に取り付けられるドラムギ
ヤ２１には第１図（ａ）。The laser printer according to the present invention has the same basic configuration as the conventional laser printer 1 shown in FIG. (a).
（ｂ）に示すようにトナー侵入防止用のフランジ２１ａ
が一体に形成されている。As shown in (b), a flange 21a for preventing toner intrusion
are integrally formed.
而して、前述の一連の画像形成プロセスにおいて′、ト
ナーが感光トラム４のドラムシリンダ２０の軸方向に流
飛しても、ドラムシリンダ２０とドラムギヤ２１の歯部
２１ｂとの間にはフランジ２１ａが形成されているため
、ドラムシリンダ２０の軸方向に流飛して来たトナーの
トラムギヤ２１の歯部２１ｂへの侵入はフランジ２１ａ
によつて効果的に阻止され、トラムギヤ２１の歯面及び
歯底へのトナーの固着が確実に防止される。Therefore, even if the toner is flown away in the axial direction of the drum cylinder 20 of the photosensitive tram 4 in the above-described series of image forming processes, the flange 21a remains between the drum cylinder 20 and the tooth portion 21b of the drum gear 21. is formed, the toner that has flown away in the axial direction of the drum cylinder 20 does not enter the tooth portion 21b of the tram gear 21 through the flange 21a.
This effectively prevents toner from adhering to the tooth surfaces and tooth bottoms of the tram gear 21.
以上の結果、トラムギヤ２１と不図示のドラム駆動ギヤ
との噛み合いは常に均一に行なわれ、第４図に示すスキ
ャナユニット８から照射されたレーザ光による感光ドラ
ム４上への潜像の形成及び該潜像のシート材Ｓへの転写
が正確に行なわれ。As a result of the above, the tram gear 21 and the drum drive gear (not shown) are always meshed uniformly, and a latent image is formed on the photosensitive drum 4 by the laser beam irradiated from the scanner unit 8 shown in FIG. The latent image is accurately transferred to the sheet material S.
ピッチムラの無い高質な画像が常に安定して形成される
。High-quality images without pitch unevenness are always stably formed.
尚、本実施例のようにフランジ部２１ａをトラムギヤ２
１と一体に形成すれば、両者は同材質で構成され、ドラ
ムギヤ２１の製造コストも従来のものと殆ど同程度に抑
えることができる。又、ギヤ列にはその噛み合いを円滑
にする目的で潤滑剤が塗布されることがあるが、この場
合、ドラムギヤ２１からドラムシリンダ２０への潤滑剤
の侵入もフランジ２１ａによって阻止される。Incidentally, as in this embodiment, the flange portion 21a is connected to the tram gear 2.
If the drum gear 21 is formed integrally with the drum gear 1, both of them are made of the same material, and the manufacturing cost of the drum gear 21 can be reduced to almost the same level as that of the conventional drum gear. Further, although a lubricant is sometimes applied to the gear train for the purpose of smoothing the meshing thereof, in this case, the lubricant is also prevented from entering the drum cylinder 20 from the drum gear 21 by the flange 21a.
次に１本発明の第２実施例を第２図（ａ）。Next, a second embodiment of the present invention is shown in FIG. 2(a).
（ｂ）に基づいて説明する。The explanation will be based on (b).
即ち、第２図（ａ）は感光ドラムの一端部の斜視図、同
１１ｇ（ｂ）は同半裁断面図であり１本実施例ではドラ
ムギヤ２１の径をドラムシリンダ２０のそれよりも大き
くシ、ドラムギヤ２１の歯面及び歯底とドラムシリンダ
２０の外周面との間に段差を形成しており、この段差の
ためにドラムシリンダ２０の軸方向に流飛して来たトナ
ーのトラムギヤ２１の歯面及び歯底への付着が阻止され
、本実施例でも前記第１実施例にて得られたと同様の効
果が得られる。That is, FIG. 2(a) is a perspective view of one end of the photosensitive drum, and FIG. 2(b) is a half-cut sectional view of the same. In this embodiment, the diameter of the drum gear 21 is made larger than that of the drum cylinder 20. A step is formed between the tooth surface and tooth bottom of the drum gear 21 and the outer peripheral surface of the drum cylinder 20, and due to this step, the teeth of the tram gear 21 of the toner that has flown away in the axial direction of the drum cylinder 20. Adhesion to the tooth surface and tooth bottom is prevented, and the same effect as that obtained in the first embodiment can be obtained in this embodiment.
更に１本発明の第３実施例を第３図（ａ）。Furthermore, a third embodiment of the present invention is shown in FIG. 3(a).
（ｂ）に基づいて説明する。尚、第３図（ａ）はベルト
タイプの像担持体の斜視図、同図（ｂ）はローラの一端
部の半裁断面図である。The explanation will be based on (b). 3(a) is a perspective view of a belt-type image carrier, and FIG. 3(b) is a half-cut sectional view of one end of the roller.
本実施例では、互いに平行に配された２本のローラ２４
，２４間に感光ベルト２３が巻装されており、一方のロ
ーラ２４の端部には前記第１実施例で用いられたと同様
のギヤ２１（第１図（ａ）、（ｂ）参照）が取り付けら
れている。In this embodiment, two rollers 24 are arranged parallel to each other.
, 24, and a gear 21 (see FIGS. 1(a) and 1(b)) similar to that used in the first embodiment is attached to the end of one roller 24. installed.
而して、感光ベルト２３上のトナーのギヤ２１の歯部２
１ｂへの侵入はフランジ２１ａによって阻止されるため
、本実施例においてもピッチムラの無い高質な画像が得
られる。尚、感光ベルト２３を回転させると、これはス
ラスト方向の何れかに寄り易いが１本実施例ではギヤ２
１に形成された７ランジ２１ａが感光ベルト２３のスラ
スト方向の移動に対するストッパとしても機能している
。Therefore, the tooth portion 2 of the gear 21 of the toner on the photosensitive belt 23
Since the flange 21a prevents the light from entering 1b, a high-quality image without pitch unevenness can be obtained in this embodiment as well. Incidentally, when the photosensitive belt 23 is rotated, it tends to shift toward one of the thrust directions, but in this embodiment, the gear 2
The seven flange 21a formed at 1 also functions as a stopper for movement of the photosensitive belt 23 in the thrust direction.
（発明の効果）
以上の説明で明らかな如く本発明によれば、電子写真技
術を用いた画像形成装置において、像担持体の像担持表
面と、該像担持体を回転駆動するギヤの歯面とが略直線
状に連設されないよう構成したため、ピッチムラの無い
高質な画像を得ることができるという効果が得られる。(Effects of the Invention) As is clear from the above description, according to the present invention, in an image forming apparatus using electrophotography, the image bearing surface of an image bearing member and the tooth surface of a gear that rotationally drives the image bearing member Since it is configured so that the two are not arranged in a substantially straight line, it is possible to obtain a high-quality image without pitch unevenness.
第１図（ａ）は本発明に係るレーザプリンタに用いられ
る感光ドラムの一端部の斜視図、同図（ｂ）は同半裁断
面図、第２図＜ａ＞は感光ドラムの一端部の斜視図、同
図（ｂ）は同半裁断面図、第３図（ａ）はベルトタイプ
の像担持体の斜視図、同図（ｂ）はローラの一端部の半
裁断面図、第４図はレーザプリンタの構成を示す断面図
、第５図（ａ）は従来のレーザプリンタの感光ドラム端
部（駆動系）の斜視図、同図（ｂ）は同半裁断面図、ｌ
’！６５！１（ａ）はドラムギヤの斜視図、同図（ｂ）
は同側面図、第７図（ａ）。
（ｂ）はシート材上への画像形成例を示す図である。
１−・・レーザプリンタ（画像形成装置）、４−・・感
光ドラム（像担持体）、
２０−・・ドラムシリンダ。
２１−・・ドラムギヤ。
２１ｍ・・・フランジ（障壁）
２３−・・感光ベルト
（像担持体）FIG. 1(a) is a perspective view of one end of a photosensitive drum used in a laser printer according to the present invention, FIG. 1(b) is a half-cut sectional view of the same, and FIG. 3(b) is a half-cut sectional view of the same, FIG. 3(a) is a perspective view of a belt-type image carrier, FIG. 4(b) is a half-cut sectional view of one end of the roller, and FIG. 5(a) is a perspective view of the end portion (drive system) of a photosensitive drum of a conventional laser printer, and FIG. 5(b) is a half-sectional view of the same.
'! 65!1 (a) is a perspective view of the drum gear, the same figure (b)
is the same side view, FIG. 7(a). (b) is a diagram showing an example of image formation on a sheet material. 1--Laser printer (image forming device), 4--Photosensitive drum (image carrier), 20--Drum cylinder. 21--Drum gear. 21m...Flange (barrier) 23-...Photosensitive belt (image carrier)
Claims (2)
担持体の像担持表面と、該像担持体を回転駆動するギヤ
の歯面とが略直線状に連設されないよう構成したことを
特徴とする画像形成装置。(1) An image forming apparatus using electrophotographic technology, characterized in that the image bearing surface of the image bearing member and the tooth surface of the gear that rotationally drives the image bearing member are not connected in a substantially straight line. image forming apparatus.
間に障壁を設けたことを特徴とする請求項１記載の画像
形成装置。(2) The image forming apparatus according to claim 1, further comprising a barrier provided between the image bearing surface of the image bearing member and the tooth surface of the gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1330995A JPH03192372A (en) | 1989-12-22 | 1989-12-22 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1330995A JPH03192372A (en) | 1989-12-22 | 1989-12-22 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03192372A true JPH03192372A (en) | 1991-08-22 |
Family
ID=18238658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1330995A Pending JPH03192372A (en) | 1989-12-22 | 1989-12-22 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03192372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006078840A (en) * | 2004-09-10 | 2006-03-23 | Fuji Xerox Co Ltd | Worm gear unit and image forming apparatus |
| JP2007098632A (en) * | 2005-09-30 | 2007-04-19 | Asmo Co Ltd | Method and apparatus for producing toothed wheel, toothed wheel, and motor with decelerating mechanism |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452170A (en) * | 1987-08-24 | 1989-02-28 | Ricoh Kk | Image forming device |
-
1989
- 1989-12-22 JP JP1330995A patent/JPH03192372A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452170A (en) * | 1987-08-24 | 1989-02-28 | Ricoh Kk | Image forming device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006078840A (en) * | 2004-09-10 | 2006-03-23 | Fuji Xerox Co Ltd | Worm gear unit and image forming apparatus |
| JP2007098632A (en) * | 2005-09-30 | 2007-04-19 | Asmo Co Ltd | Method and apparatus for producing toothed wheel, toothed wheel, and motor with decelerating mechanism |
| JP4707523B2 (en) * | 2005-09-30 | 2011-06-22 | アスモ株式会社 | Gear manufacturing method and gear manufacturing apparatus |
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