JP4322076B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4322076B2
JP4322076B2 JP2003325335A JP2003325335A JP4322076B2 JP 4322076 B2 JP4322076 B2 JP 4322076B2 JP 2003325335 A JP2003325335 A JP 2003325335A JP 2003325335 A JP2003325335 A JP 2003325335A JP 4322076 B2 JP4322076 B2 JP 4322076B2
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drive
forming apparatus
image forming
image
image carriers
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JP2005091780A (en
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俊之 内田
譲 江原
憲昭 船本
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

本発明は、複数の像担持体を有する複写機、プリンタ、ファクシミリ等の電子写真方式の画像形成装置に関する。   The present invention relates to an electrophotographic image forming apparatus such as a copying machine, a printer, and a facsimile having a plurality of image carriers.

従来では、複数の像但持体を有する画像形成装置、例えば、カラープリンタ等では、画像形成装置筐体に色毎の作像部、及び夫々を駆動させるための部材を個別に組み付けて画像形成装置全体を作り上げるのが常であった。   Conventionally, in an image forming apparatus having a plurality of image holders, for example, a color printer, an image forming unit for each color and a member for driving each color are individually assembled in an image forming apparatus housing to form an image. It was usual to make up the entire device.

しかしながら、そのような方式では、各色駆動系は、画像形成装置のほぼ全体を組み上げてからでなくては品質が見極められない、或いは部品がバラバラに散らばっているためにリサイクル性に劣る、或いは組み立て性が悪い等の不具合が生じる。
本発明の目的は、基本的にタンデム方式の画像形成装置の駆動系をすべての像担持体の駆動系をユニット化することによって、駆動ユニット単品での保証を容易に行い、また、それを可能にすることによってリサイクル性および組み立て性を高める画像形成装置を提供することにある。 However, in such a system, each color drive system is inferior in recyclability or assembled because the quality cannot be determined until almost the entire image forming apparatus is assembled, or parts are scattered apart. Troubles such as poor nature occur.
The object of the present invention is to make the drive system of a tandem type image forming apparatus a unit of the drive system of all image carriers so that the drive unit can be assured easily and possible. It is an object of the present invention to provide an image forming apparatus that improves recyclability and assemblability.

上記の課題を解決するために、請求項１に記載の発明は、複数の像担持体を有する画像形成装置において、前記複数の像担持体の周面に夫々形成された画像が転写される中間転写ベルトを有し、前記複数の像担持体の駆動手段は、前記複数の像担持体を夫々駆動する複数の駆動源と、該駆動源から該像担持体へ夫々駆動を伝達する複数の駆動伝達部材と、該複数の駆動伝達部材の回転軸の端部に夫々設けられ、該複数の駆動伝達部材と前記複数の像担持体とを夫々駆動伝達可能に連結する複数の軸継手と、前記複数の駆動伝達部材の回転軸を夫々回転自在に支持する回転軸支持部及び前記中間転写ベルトの駆動ローラを回転自在に支持する駆動ローラ支持部を有する第１の側板と、前記複数の駆動源及び前記駆動ローラを駆動する中間転写駆動源を支持する第２の側板と、を有する一体化されたユニット構成であることを特徴とする。
また、請求項２に記載の発明は、前記回転軸支持部は、前記複数の像担持体における夫々の間隔とほぼ同じ間隔で前記第１側板に設けられることを特徴とする。
また、請求項３に記載の発明は、前記駆動ユニットを装置本体に組み付けた時、前記回転軸支持部の一つを主基準、他の一つを従基準とし装置本体に位置決めすることを特徴とする。
また、請求項４に記載の発明は、前記複数の像担持体が、前記回転軸支持部に夫々位置決めされることを特徴とする。
また、請求項５に記載の発明は、前記複数の軸継手が、自在軸継手であることを特徴とする。
また、請求項６に記載の発明は、前記回転軸支持部は、前記第１の側板に夫々位置決め固定されたシャフトホルダであり、該シャフトホルダは、前記複数の像担持体の周面に形成された潜像を現像するための複数の現像ローラを位置決めする孔を有することを特徴とする。
また、請求項７に記載の発明は、前記像担持体がプロセスカートリッジに保持される請求項１に記載の画像形成装置を特徴とする。 In order to solve the above-described problems, according to a first aspect of the present invention, there is provided an image forming apparatus having a plurality of image carriers, in which images formed respectively on the peripheral surfaces of the plurality of image carriers are transferred. A plurality of image carriers having a transfer belt, wherein the plurality of image carriers are driven by a plurality of drive sources that respectively drive the plurality of image carriers, and a plurality of drives that transmit driving from the drive sources to the image carriers. A transmission member, and a plurality of shaft couplings that are provided at end portions of the rotation shafts of the plurality of drive transmission members, respectively, and that couple the plurality of drive transmission members and the plurality of image carriers so as to be capable of driving transmission, respectively; A first side plate having a rotation shaft support portion that rotatably supports rotation shafts of a plurality of drive transmission members, a drive roller support portion that rotatably supports a drive roller of the intermediate transfer belt, and the plurality of drive sources And intermediate transfer drive for driving the drive roller Characterized in that the second side plate for supporting the source is an integral unit configuration having.
According to a second aspect of the present invention, the rotating shaft support portion is provided on the first side plate at substantially the same interval as each of the plurality of image carriers .
The invention according to claim 3 is characterized in that when the drive unit is assembled to the apparatus main body , one of the rotating shaft support portions is positioned as a main reference and the other one is set as a sub-reference to the apparatus main body. And
The invention according to claim 4 is characterized in that the plurality of image carriers are respectively positioned on the rotating shaft support portion .
The invention according to claim 5 is characterized in that the plurality of shaft couplings are universal shaft couplings.
According to a sixth aspect of the present invention, the rotating shaft support portion is a shaft holder that is positioned and fixed to the first side plate, and the shaft holder is formed on the peripheral surfaces of the plurality of image carriers. And a hole for positioning a plurality of developing rollers for developing the latent image formed.
According to a seventh aspect of the invention, the image forming apparatus according to the first aspect is characterized in that the image carrier is held by a process cartridge.

本発明によれば、タンデム方式の画像形成装置の像担持体の駆動系をユニット化し一体にすることによって、駆動ユニット単品での保証を容易にし、リサイクル性および組み立て性を高めることが可能となる。
また、各像担持体間ピッチの位置出しを容易にし、筐体と駆動系の位置出しを容易にし、また画像形成装置の筐体としての強度をアップさせ、駆動側シャフト−像担持体間の位置出しを簡素な構成で容易にし、駆動側シャフトと像担持体側シャフトに偏角がついても変動をドラム側に伝えにくくする。 According to the present invention, the drive system of the image carrier of the tandem type image forming apparatus is unitized and integrated, so that it is easy to guarantee the drive unit alone, and it is possible to improve recyclability and assemblability. .
Also, it is easy to locate the pitch between the image carriers, facilitate the positioning of the housing and the drive system, increase the strength as the housing of the image forming apparatus, and between the drive side shaft and the image carrier. Positioning is facilitated with a simple configuration, and even if the drive side shaft and the image carrier side shaft are deviated, fluctuations are hardly transmitted to the drum side.

以下、図面を参照して、本発明の実施形態を詳細に説明する。図１は本発明の実施の形態であるプリンタの１部分を示す概略断面図である。本実施の形態においては、感光体１ａ〜１ｄを４個有するタンデム方式の画像形成装置である。
それぞれ図１の右から、黒（Ｋ）感光体１ａ、イエロー（Ｙ）感光体１ｂ、マゼンタ（Ｍ）感光体１ｃ、シアン（Ｃ）感光体１ｄである。各々の感光体１ａ〜１ｄは駆動源である４個のモータの駆動軸（駆動ギヤ）２ａ〜２ｄを駆動源として、それに噛み合う大口径ギヤ３ａ〜３ｄにより駆動伝達され、感光体１ａ〜１ｄを駆動する。
大口径ドラムギヤ３ａ〜３ｄの１回転に１度の出力信号を検出するためにフォトインタ ラプタ（ポジションセンサ）４ａ〜４ｄを搭載する。各感光体１ａ〜１ｄ上のトナーは中間転写ベルト５上に順次転写され、２次転写ローラ７にて、転写紙に転写される。図中、符号６は中間転写ベルト５の面と対向配置されたパターン検出センサである。
図２は本実施の形態の駆動ユニットを本体筐体側から見た斜視図である。図３は図２の逆方向から見た斜視図である。図４は図３の第２側板を除去して示す斜視図である。
画像形成装置の駆動部において、駆動ユニット１０は第１側板１１と第２側板１２を有する構造体として構成されている。図４によると第１側板１１には、各色のシャフトホルダ１３ａ〜１３ｄと中間転写ベルト駆動ローラ軸上の中転ベアリングケース１４がネジ止めされている。第１側板１１のカシメ軸には、クラッチ１５ｃを含んだ現像駆動用のギヤ群１５ａ〜ｄが４色分配置される。
図５は感光体駆動ギヤを示す斜視図である。図６は図５の感光体駆動ギヤを背部から見た斜視図である。図５および図６において、ドラム軸（組み立て）１６には、シャフト１７の同軸上に先端から自在軸継手１８、ベアリング１９、感光体駆動ギヤ３、この感光体駆動ギヤ３に圧入されたベアリング２０、シャフト１７と感光体駆動ギヤ３を締結するネジ２１にて構成される。
図７はベアリングを圧入したギヤを示す概略斜視図である。ドラム軸（組み立て）１６の手前側のベアリング１９の外輪を、シャフトホルダ１３ａ〜１３ｄ、例えば、シャフトホルダ１３ａの穴に挿入し芯出しを行う。また、中転ベアリングケース１４に係合する中間転写ベルト駆動ローラ軸には、先端にベアリング２１を圧入したギヤ２２が係合する。
圧入されたベアリング２１の外輪を中転ベアリングケース１４の穴に挿入し芯出しを行う。一方、第２側板１２は、第１側板１１に合わせてネジ止めし、第２側板１２には、ドラムギヤベアリングケース２３ａ〜２３ｄをベアリング２０ａ〜２０ｄの外輪に挿入し芯を出し、ネジ止めする。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing a part of a printer according to an embodiment of the present invention. In this embodiment, the image forming apparatus is a tandem type image forming apparatus having four photoreceptors 1a to 1d.
From the right in FIG. 1, there are a black (K) photoreceptor 1a, a yellow (Y) photoreceptor 1b, a magenta (M) photoreceptor 1c, and a cyan (C) photoreceptor 1d. Each of the photoconductors 1a to 1d is driven and transmitted by large-diameter gears 3a to 3d that mesh with the drive shafts (drive gears) 2a to 2d of four motors as drive sources, and the photoconductors 1a to 1d are transmitted. To drive.
Photointerrupters (position sensors) 4a to 4d are mounted to detect an output signal once per rotation of the large diameter drum gears 3a to 3d. The toner on each of the photoconductors 1 a to 1 d is sequentially transferred onto the intermediate transfer belt 5 and transferred onto the transfer paper by the secondary transfer roller 7. In the figure, reference numeral 6 denotes a pattern detection sensor arranged to face the surface of the intermediate transfer belt 5.
FIG. 2 is a perspective view of the drive unit of the present embodiment as viewed from the main body casing side. FIG. 3 is a perspective view seen from the reverse direction of FIG. FIG. 4 is a perspective view showing the second side plate of FIG. 3 with the second side plate removed.
In the drive unit of the image forming apparatus, the drive unit 10 is configured as a structure having a first side plate 11 and a second side plate 12. According to FIG. 4, the shaft holders 13 a to 13 d for the respective colors and the intermediate transfer bearing case 14 on the intermediate transfer belt drive roller shaft are screwed to the first side plate 11. On the caulking shaft of the first side plate 11, gear groups 15a to 15d for development driving including the clutch 15c are arranged for four colors.
FIG. 5 is a perspective view showing the photosensitive member driving gear. FIG. 6 is a perspective view of the photoreceptor driving gear of FIG. 5 as seen from the back. 5 and 6, the drum shaft (assembly) 16 includes a universal shaft joint 18, a bearing 19, a photosensitive member driving gear 3, and a bearing 20 press-fitted into the photosensitive member driving gear 3 on the same axis as the shaft 17. The screw 17 is used to fasten the shaft 17 and the photosensitive member driving gear 3.
FIG. 7 is a schematic perspective view showing a gear in which a bearing is press-fitted. Centering is performed by inserting the outer ring of the bearing 19 on the front side of the drum shaft (assembly) 16 into shaft holders 13a to 13d, for example, holes of the shaft holder 13a. Further, the intermediate transfer belt drive roller shaft engaged with the intermediate transfer bearing case 14 is engaged with a gear 22 having a bearing 21 press-fitted at the tip.
The outer ring of the press-fitted bearing 21 is inserted into the hole of the intermediate transfer bearing case 14 to perform centering. On the other hand, the second side plate 12 is screwed together with the first side plate 11, and the drum gear bearing cases 23a to 23d are inserted into the outer rings of the bearings 20a to 20d on the second side plate 12, and the core is aligned and screwed. .

図８は感光体と駆動連結する自在軸継手１８の構成を示す分解斜視図である。また、ドラムおよび現像駆動用の各色の駆動モータ２４ａ〜２４ｄおよび中間転写駆動モータ２５が第２側板１２にネジ止めされる。
ここで、４色の感光体１ａ〜１ｄを有する本実施の形態の画像形成装置において、感光体１ａ〜１ｄの駆動手段は４つのモータ２４ａ〜２４ｄ、駆動伝達部材であるギヤ３ａ〜３ｄ、感光体１ａ〜１ｄと同軸上のドラム軸（組み立て）１６ａ〜１６ｄおよび４つのシャフトホルダ１３ａ〜１３ｄ、感光体１ａ〜１ｄと駆動連結する自在継手１８、シャフトホルダ１３ａ〜１３ｄを支持する第１の側板１１、複数の駆動モータ２４ａ〜２４ｄを支持する第２の側板１２といった一体化された単独のユニット１０の構成を取る。
このような構成をとることによって、駆動ユニット１０を一つのモジュールとして各特性値を押さえることが可能となる。また、駆動ユニット１０として保証できるため、リサイクル性が高い。また、本体組み立て時はユニットを筐体に組み付けるだけであり、組み立て性が向上する。
駆動ユニット１０を構成するシャフトホルダ１３ａ〜１３ｄは、像担持体（感光体）間距離とほぼ同じ間隔で第１側板１１に位置決め固定される。したがって駆動ユニット１０中に構成されるシャフトホルダ１３ａ〜１３ｄは感光体ピッチ間Ｌとほぼ同じ間隔で第１側板１１に位置決めされている。
図９は画像形成装置本体筐体に一体化された駆動ユニットを示す概略斜視図である。図１０は図９の駆動ユニットの、とくにシャフトホルダを示す概略斜視図である。
一体化された駆動ユニット１０は画像形成装置本体筐体２６に、黒用のシャフトホルダ１３ａが主基準として画像形成装置本体筐体２６の穴２７に位置決めされる。また、黒用シャフトホルダ１３ａから一番遠いシアン用シャフトホルダ１３ｄは画像形成装置本体筐体２６の長穴２８に挿入され従基準となる。これによって画像形成装置本体筐体２６と駆動系の位置出しを容易にし、また画像形成装置の筐体としての強度を増大させる。 FIG. 8 is an exploded perspective view showing the configuration of the universal shaft joint 18 that is drivingly connected to the photosensitive member. The drum and developing drive motors 24 a to 24 d and the intermediate transfer drive motor 25 are screwed to the second side plate 12.
Here, in the image forming apparatus according to the present embodiment having the four color photoconductors 1a to 1d, the drive means for the photoconductors 1a to 1d is four motors 24a to 24d, gears 3a to 3d as drive transmission members, and photoconductors. Drum shafts (assembly) 16a to 16d coaxial with the bodies 1a to 1d, four shaft holders 13a to 13d, a universal joint 18 that is drivingly connected to the photoreceptors 1a to 1d, and a first side plate that supports the shaft holders 13a to 13d. 11. It takes the configuration of an integrated single unit 10 such as the second side plate 12 that supports the plurality of drive motors 24a to 24d.
By adopting such a configuration, it is possible to suppress each characteristic value by using the drive unit 10 as one module. Moreover, since it can guarantee as the drive unit 10, it is highly recyclable. Further, when assembling the main body, the unit is simply assembled to the housing, and the assemblability is improved.
The shaft holders 13a to 13d constituting the drive unit 10 are positioned and fixed to the first side plate 11 at substantially the same interval as the distance between the image carriers (photosensitive members). Accordingly, the shaft holders 13 a to 13 d configured in the drive unit 10 are positioned on the first side plate 11 at substantially the same interval as the photosensitive member pitch L.
FIG. 9 is a schematic perspective view showing a drive unit integrated with the image forming apparatus main body casing. FIG. 10 is a schematic perspective view of the drive unit of FIG. 9, particularly showing a shaft holder.
The integrated drive unit 10 is positioned in the image forming apparatus main body casing 26, and the black shaft holder 13a is positioned in the hole 27 of the image forming apparatus main body casing 26 as a main reference. Further, the cyan shaft holder 13d farthest from the black shaft holder 13a is inserted into the elongated hole 28 of the image forming apparatus main body casing 26, and becomes a secondary reference. This facilitates positioning of the image forming apparatus main body casing 26 and the drive system, and increases the strength of the image forming apparatus as a casing.

図１１は４つの感光体の４つのシャフトホルダへの挿入を説明する概略斜視図である。４つの感光体１ａ〜１ｄは４つのシャフトホルダ１３ａ〜１３ｄに挿入され、芯出しを行っている。
図８により自在軸継手１８をさらに説明する。感光体１と駆動連結するジョイント１８は自在軸継手で構成されている。形状は、３体構成で、ジョイント２９はピン３２ａおよび３２ｃをジョイント３０に圧入することにより連結される。
ジョイント３１は、ピン３２ｂおよび３２ｄをジョイント３０に圧入することにより連結される。これによって、駆動ユニット１０の感光体１と同軸上のシャフト１７と感光体１側シャフト４３に偏角がついていても変動を伝えにくくなる。
図１２は４本の現像ローラの４つのシャフトホルダへの挿入を説明する概略斜視図である。４本の現像ローラ３３ａ〜３３ｄは各色のシャフトホルダ１３ａ〜１３ｄの穴３４ａ〜３４ｄに挿入され位置決めが行われる。感光体１および現像ローラ３３が同様のパーツであるシャフトホルダ１３に挿入するので、感光体１から現像ローラ３３の位置決めが容易になる。
図１３は感光体がプロセスカートリッジに保持される構成を示す概略斜視図である。感光体１ａ〜１ｄは、図１３に示すように、プロセスカートリッジ３５ａ〜３５ｄに保持される構成となっている。これによって、プロセスカートリッジ間ピッチは駆動ユニット１０によって決まる。
図１４は本実施の形態を適用する転写ベルト方式を示す概略図である。また、本実施の形態は、図１の通りに中間転写ベルト方式に限らず、図１４のように直接転写ベルト方式３６においても適用可能である。 FIG. 11 is a schematic perspective view for explaining the insertion of the four photoconductors into the four shaft holders. The four photoconductors 1a to 1d are inserted into the four shaft holders 13a to 13d for centering.
The universal shaft joint 18 will be further described with reference to FIG. The joint 18 that is drivingly connected to the photosensitive member 1 is constituted by a universal shaft joint. The shape is a three-body configuration, and the joint 29 is connected by press-fitting pins 32 a and 32 c into the joint 30.
The joint 31 is connected by pressing the pins 32b and 32d into the joint 30. As a result, even if the shaft 17 coaxial with the photosensitive member 1 of the driving unit 10 and the photosensitive member 1 side shaft 43 have a declination, it is difficult to transmit the fluctuation.
FIG. 12 is a schematic perspective view for explaining the insertion of the four developing rollers into the four shaft holders. The four developing rollers 33a to 33d are inserted into the holes 34a to 34d of the shaft holders 13a to 13d for the respective colors and positioned. Since the photosensitive member 1 and the developing roller 33 are inserted into the shaft holder 13 which is the same part, the positioning of the developing roller 33 from the photosensitive member 1 becomes easy.
FIG. 13 is a schematic perspective view showing a configuration in which the photosensitive member is held by the process cartridge. As shown in FIG. 13, the photoconductors 1a to 1d are held by process cartridges 35a to 35d. Thereby, the pitch between the process cartridges is determined by the drive unit 10.
FIG. 14 is a schematic view showing a transfer belt system to which this embodiment is applied. Further, the present embodiment is not limited to the intermediate transfer belt system as shown in FIG. 1, but can also be applied to the direct transfer belt system 36 as shown in FIG.

本発明の実施の形態であるプリンタの１部分を示す概略断面図である。1 is a schematic cross-sectional view showing a part of a printer according to an embodiment of the present invention. 本実施の形態の駆動ユニットを本体筐体側から見た斜視図である。It is the perspective view which looked at the drive unit of this Embodiment from the main body housing | casing side. 図２の逆から見た斜視図である。It is the perspective view seen from the reverse of FIG. 図３の第２側板を除去して示す斜視図である。It is a perspective view which removes and shows the 2nd side board of FIG. 感光体駆動ギヤを示す斜視図である。It is a perspective view which shows a photoconductor drive gear. 図５の感光体駆動ギヤを背部から見た斜視図である。FIG. 6 is a perspective view of the photoconductor driving gear of FIG. 5 as viewed from the back. ベアリングを圧入したギヤを示す概略斜視図である。It is a schematic perspective view which shows the gear which press-fit the bearing. 感光体と駆動連結する自在継手を示す分解斜視図である。It is a disassembled perspective view which shows the universal joint drive-connected with a photoconductor. 画像形成装置本体筐体に一体化された駆動ユニットを示す概略斜視図である。2 is a schematic perspective view showing a drive unit integrated with an image forming apparatus main body housing; FIG. 図９の駆動ユニットの、とくにシャフトホルダを示す概略斜視図である。FIG. 10 is a schematic perspective view of the drive unit of FIG. 9, in particular showing a shaft holder. ４つの感光体の４つのシャフトホルダへの挿入を説明する概略斜視図である。It is a schematic perspective view explaining insertion of four photoconductors into four shaft holders. ４本の現像ローラの４つのシャフトホルダへの挿入を説明する概略斜視図である。It is a schematic perspective view explaining the insertion of four developing rollers into four shaft holders. 感光体がプロセスカートリッジに保持される構成を示す概略斜視図である。2 is a schematic perspective view showing a configuration in which a photosensitive member is held by a process cartridge. FIG. 本実施の形態を適用する転写ベルト方式を示す概略図である。It is the schematic which shows the transfer belt system to which this Embodiment is applied.

符号の説明Explanation of symbols

１ 像担持体（感光体１ａ、１ｂ、１ｃ、１ｄ）
２ａ 駆動モータの駆動軸（駆動ギヤ）
３ａ 駆動伝達部材（大口径ギヤ）
１０ 駆動ユニット
１１ 第１側板
１２ 第２側板
１３ａ シャフトホルダ
１７ シャフト
１８ ジョイント（軸継ぎ手）
２４ａ 駆動モータ
３５ａ プロセスカートリッジ 1 Image carrier (photosensitive members 1a, 1b, 1c, 1d)
2a Drive shaft of drive motor (drive gear)
3a Drive transmission member (large diameter gear)
10 drive unit 11 first side plate 12 second side plate 13a shaft holder 17 shaft 18 joint (shaft joint)
24a Drive motor 35a Process cartridge

Claims (7)

複数の像担持体を有する画像形成装置において、
前記複数の像担持体の周面に夫々形成された画像が転写される中間転写ベルトを有し、
前記複数の像担持体の駆動手段は、
前記複数の像担持体を夫々駆動する複数の駆動源と、
該駆動源から該像担持体へ夫々駆動を伝達する複数の駆動伝達部材と、
該複数の駆動伝達部材の回転軸の端部に夫々設けられ、該複数の駆動伝達部材と前記複数の像担持体とを夫々駆動伝達可能に連結する複数の軸継手と、
前記複数の駆動伝達部材の回転軸を夫々回転自在に支持する回転軸支持部及び前記中間転写ベルトの駆動ローラを回転自在に支持する駆動ローラ支持部を有する第１の側板と、
前記複数の駆動源及び前記駆動ローラを駆動する中間転写駆動源を支持する第２の側板と、
を有する一体化されたユニット構成であることを特徴とする画像形成装置。 In an image forming apparatus having a plurality of image carriers,
An intermediate transfer belt to which images respectively formed on the peripheral surfaces of the plurality of image carriers are transferred;
The drive means for the plurality of image carriers is
A plurality of drive sources for respectively driving the plurality of image carriers;
A plurality of drive transmission members that respectively transmit drive from the drive source to the image carrier;
A plurality of shaft couplings that are respectively provided at end portions of the rotation shafts of the plurality of drive transmission members, and that connect the plurality of drive transmission members and the plurality of image carriers so as to be able to transmit the drive, respectively;
A first side plate having a rotation shaft support portion that rotatably supports the rotation shafts of the plurality of drive transmission members, and a drive roller support portion that rotatably supports the drive roller of the intermediate transfer belt;
A second side plate that supports the plurality of drive sources and an intermediate transfer drive source that drives the drive roller;
An image forming apparatus having an integrated unit configuration . 前記回転軸支持部は、前記複数の像担持体における夫々の間隔とほぼ同じ間隔で前記第１側板に設けられることを特徴とする請求項１に記載の画像形成装置。 The image forming apparatus according to claim 1, wherein the rotation shaft support portions are provided on the first side plate at substantially the same intervals as the intervals between the plurality of image carriers . 前記駆動ユニットを装置本体に組み付けた時、前記回転軸支持部の一つを主基準、他の一つを従基準とし装置本体に位置決めすることを特徴とする請求項１に記載の画像形成装置。 2. The image forming apparatus according to claim 1, wherein when the drive unit is assembled to the apparatus main body , the rotation unit is positioned on the apparatus main body with one of the rotating shaft support portions as a main reference and the other one as a sub-reference. . 前記複数の像担持体が、前記回転軸支持部に夫々位置決めされることを特徴とする請求項１に記載の画像形成装置。 The image forming apparatus according to claim 1, wherein the plurality of image carriers are respectively positioned on the rotating shaft support portion . 前記複数の軸継手が、自在軸継手であることを特徴とする請求項１に記載の画像形成装置。 The image forming apparatus according to claim 1, wherein the plurality of shaft couplings are universal shaft couplings. 前記回転軸支持部は、前記第１の側板に夫々位置決め固定されたシャフトホルダであり、
該シャフトホルダは、前記複数の像担持体の周面に形成された潜像を現像するための複数の現像ローラを位置決めする孔を有することを特徴とする請求項４に記載の画像形成装置。 The rotating shaft support portion is a shaft holder that is positioned and fixed to the first side plate,
The image forming apparatus according to claim 4, wherein the shaft holder has a hole for positioning a plurality of developing rollers for developing latent images formed on the peripheral surfaces of the plurality of image carriers. 前記複数の像担持体が夫々プロセスカートリッジに保持されることを特徴とする請求項１に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein each of the plurality of image carriers is held by a process cartridge.
JP2003325335A 2003-09-17 2003-09-17 Image forming apparatus Expired - Fee Related JP4322076B2 (en)

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JP4948885B2 (en) 2006-04-27 2012-06-06 京セラミタ株式会社 Image forming apparatus
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