JP4366355B2 - Process cartridge and image forming apparatus - Google Patents

Process cartridge and image forming apparatus Download PDF

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JP4366355B2
JP4366355B2 JP2005329377A JP2005329377A JP4366355B2 JP 4366355 B2 JP4366355 B2 JP 4366355B2 JP 2005329377 A JP2005329377 A JP 2005329377A JP 2005329377 A JP2005329377 A JP 2005329377A JP 4366355 B2 JP4366355 B2 JP 4366355B2
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hole
shaft portion
forming apparatus
image forming
coupling
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JP2006079122A (en
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武士 安本
征浩 藤原
晃生 大野
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Canon Inc
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Description

本発明は、駆動力伝達機構を備えたプロセスカートリッジ、及び画像形成装置に関する。ここで、画像形成装置とは、電子写真方式を用いて記録媒体に画像を形成するものであり、例えば、電子写真複写機、電子写真プリンタ(例えば、レーザービームプリンタ、LEDプリンタ等)、ファクシミリ装置等が含まれる。 The present invention relates to a process cartridge including a driving force transmission mechanism and an image forming apparatus. Here, the image forming apparatus is an apparatus that forms an image on a recording medium using an electrophotographic method. For example, an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer, etc.), a facsimile apparatus, and the like. Etc. are included.

又、プロセスカートリッジとは、帯電手段、現像手段又はクリーニング手段と、電子写真感光体とを一体的にカートリッジ化し、このカートリッジを画像形成装置本体に対して着脱可能とするもの、あるいは、帯電手段、現像手段、クリーニング手段の少なくとも一つと、電子写真感光体とを一体的にカートリッジ化し、このカートリッジを画像形成装置本体に対して着脱可能とするもの、あるいは、少なくとも現像手段と、電子写真感光体とを一体的にカートリッジ化して画像形成装置本体に着脱可能としたものである。   Further, the process cartridge is a cartridge in which a charging unit, a developing unit or a cleaning unit and an electrophotographic photosensitive member are integrally formed, and the cartridge can be attached to and detached from the image forming apparatus main body, or a charging unit, At least one of developing means and cleaning means and an electrophotographic photosensitive member are integrally formed into a cartridge, and the cartridge can be attached to and detached from the image forming apparatus main body, or at least the developing means and the electrophotographic photosensitive member Are integrated into a cartridge so as to be detachable from the main body of the image forming apparatus.

又、駆動力伝達機構は、例えば、画像形成装置本体に駆動源を有する駆動系からの駆動力を被駆動系としての回転体に、ねじれた多角形により構成される凹凸部材の噛み合わせを利用して伝達する形式のものである。   The driving force transmission mechanism uses, for example, meshing of a concavo-convex member constituted by a twisted polygon to a rotating body as a driven system with driving force from a driving system having a driving source in the image forming apparatus main body. It is a form of transmission.

従来、電子写真方式の画像形成装置(複写機、又はプリンタ等)における像担持体としての感光ドラムの駆動系は、装置本体に設けられたモ−タの駆動力を受けて伝達する駆動ギヤと該駆動ギヤと同軸であり一体に回転するギヤ軸から構成される。この駆動系により感光ドラムを駆動する場合、通し軸による駆動方法とカップリングによる駆動方法が挙げられる。通し軸による駆動方法の概略を図5に示す。   2. Description of the Related Art Conventionally, a driving system for a photosensitive drum as an image carrier in an electrophotographic image forming apparatus (such as a copying machine or a printer) has a driving gear that receives and transmits a driving force of a motor provided in the apparatus body. The gear shaft is coaxial with the drive gear and rotates integrally. When driving the photosensitive drum by this driving system, there are a driving method using a through shaft and a driving method using a coupling. An outline of the driving method using the through shaft is shown in FIG.

図5に示すように、駆動ギヤ12に連結されたギヤ軸13を感光ドラム80に貫通させドラム軸として利用する。このとき感光ドラム80はギヤ軸13と一体に回転可能に支持される。これにより、モ−タ11の駆動力を伝達する駆動ギヤ12の回転が感光ドラム80の回転としてダイレクトに伝達される。   As shown in FIG. 5, a gear shaft 13 connected to the drive gear 12 is passed through the photosensitive drum 80 and used as a drum shaft. At this time, the photosensitive drum 80 is rotatably supported integrally with the gear shaft 13. As a result, the rotation of the driving gear 12 that transmits the driving force of the motor 11 is directly transmitted as the rotation of the photosensitive drum 80.

一方、図6にカップリングによる駆動方法の概略を示す。図6に示すように、ギヤ軸13と感光ドラム80をカップリング23により連結し、モータ11の駆動力を、ギヤ軸13を介して伝達する。   On the other hand, FIG. 6 shows an outline of a driving method by coupling. As shown in FIG. 6, the gear shaft 13 and the photosensitive drum 80 are connected by a coupling 23, and the driving force of the motor 11 is transmitted through the gear shaft 13.

両駆動方法を比較した場合、カップリングによる駆動方法がコスト面で優れている。更に、感光ドラムを中心とする作像系は現像装置等とともにプロセスカ−トリッジという形態で一体化され、装置本体に対する着脱性も重要視される傾向にある。これに伴い、異なる2つの軸を連結し、駆動力を伝達するカップリングの優位性が更に注目されるようになった。特に、種々あるカップリング形態の中でも図7に示すような凹凸型カップリング41の噛み合わせによる駆動力伝達が多用されている。   When both driving methods are compared, the driving method by coupling is excellent in terms of cost. Further, the image forming system centered on the photosensitive drum is integrated with the developing device in the form of a process cartridge, and the detachability with respect to the apparatus main body tends to be regarded as important. In connection with this, the advantage of the coupling which connects two different shafts and transmits the driving force has attracted more attention. In particular, among various coupling forms, driving force transmission by engagement of the concave-convex coupling 41 as shown in FIG. 7 is frequently used.

しかし、カップリングによる駆動方法は通し軸による駆動方法に比べて伝達精度の点で劣り、連結部分における2つの軸の偏角及び偏心等の問題が懸念される。これらの問題を解決するカップリングとして、特許文献1のように凹凸型をねじれた多角形の形状としたカップリングが挙げられる。図8にその一例を示す。   However, the driving method using the coupling is inferior in terms of transmission accuracy compared to the driving method using the through shaft, and there are concerns about problems such as the declination and eccentricity of the two shafts at the connecting portion. As a coupling that solves these problems, there is a coupling having a polygonal shape in which a concavo-convex shape is twisted as in Patent Document 1. An example is shown in FIG.

装置本体の駆動系Iを構成するギヤ軸13の先端には断面が正三角形のねじれた穴(以下、「ねじれ穴」という)50を有する凹型部材14が設けられている。一方、被駆動系IIを構成する筒体としての感光ドラム80の一端にはねじれ穴50と嵌合し、ねじれ角が等しい正三角形の突起10が設けられている。正三角形の突起10を有する凸型部材53はドラムフランジを兼ねている。尚、本例では正三角形の突起としたが、その他の多角形の突起でも構わない。これらの凹凸部材14、53が嵌合した状態で回転駆動がかかると、凹凸部材14、53の当接面はねじれた稜線60となるため感光ドラム80は装置本体側に引き込まれ位置決めされる。又、この引き込み効果により異なる二軸が凹凸部材14、53により結合される。以上により、感光ドラム80のスラスト方向及び周方向のガタが無くなる。   A concave member 14 having a twisted hole (hereinafter referred to as “twisted hole”) 50 having a regular triangle cross section is provided at the tip of the gear shaft 13 constituting the drive system I of the apparatus main body. On the other hand, one end of a photosensitive drum 80 as a cylindrical body constituting the driven system II is provided with a regular triangular projection 10 that fits into the twist hole 50 and has the same twist angle. The convex member 53 having the equilateral triangular projection 10 also serves as a drum flange. In this example, a regular triangular protrusion is used, but other polygonal protrusions may be used. When rotation is applied with these concavo-convex members 14 and 53 fitted, the contact surfaces of the concavo-convex members 14 and 53 become twisted ridges 60, so that the photosensitive drum 80 is drawn into the apparatus main body and positioned. Further, the two biaxial shafts that are different due to the pulling effect are coupled by the concavo-convex members 14 and 53. As a result, the backlash in the thrust direction and the circumferential direction of the photosensitive drum 80 is eliminated.

更に、凹凸部材14、53が嵌合した状態の任意の断面について図9に示す。回転駆動前は図9(a)に示すように、駆動側71(実線)の有する断面が正三角形のねじれ穴50に対し被駆動側72(破線)の有する正三角形のねじれた突起10が嵌合した状態である。ここで、両者には嵌合ガタが存在するためそれぞれの中心C1及びC2は一致しない。しかし、回転駆動後は図9(b)に示すように互いに相似な正三角形が三点で等しく当接するため、自動的に凹凸部材の中心C1及びC2が一致する。図9(b)の状態で凹凸部材間に生じる当接力Fにより駆動力の伝達が行なわれる。   Furthermore, FIG. 9 shows an arbitrary cross section in a state in which the concavo-convex members 14 and 53 are fitted. Before rotational driving, as shown in FIG. 9A, the equilateral triangular twisted protrusion 10 of the driven side 72 (broken line) is fitted into the twisted hole 50 of the driving side 71 (solid line) of the equilateral triangle. It is in a combined state. Here, the center C1 and the center C2 do not coincide with each other because there is a backlash. However, after the rotational drive, as shown in FIG. 9 (b), equilateral triangles that are similar to each other abut at three points equally, so that the centers C1 and C2 of the concavo-convex members automatically coincide. Driving force is transmitted by the contact force F generated between the concavo-convex members in the state of FIG. 9B.

以上のように、ねじれた多角形の凹凸部材を係合及び当接させるカップリングは回転駆動による感光ドラムの引き込み効果、位置決め、ガタ取り及び二軸の自動調芯をロ−コストで可能とするため、カ−トリッジ形態の感光ドラム駆動に有効であると考えられている。
特開平11−167335号公報
As described above, the coupling for engaging and abutting the twisted polygonal concavo-convex member enables the drawing effect of the photosensitive drum by rotational driving, positioning, backlashing, and biaxial automatic alignment at low cost. Therefore, it is considered effective for driving a photosensitive drum in a cartridge form.
JP-A-11-167335

上記図8及び図9に示した技術は、いずれも感光ドラムに回転力を伝達する構成として非常に有効なものである。本発明は前述した従来技術を更に発展させたものである。   The techniques shown in FIGS. 8 and 9 are very effective as a configuration for transmitting a rotational force to the photosensitive drum. The present invention is a further development of the above-described prior art.

本発明の目的は、被駆動系が駆動系以外から受ける他の力によって早回しを受け凹凸部材の当接が崩れた場合であっても、被駆動系である筒体の支持状態を安定に保ち、凹凸部材間の嵌合ガタの大きさによらず調芯精度を維持することが可能な駆動力伝達機構を具備し、色ずれの改善を図ることのできるプロセスカートリッジ、及び画像形成装置を提供することである。 The object of the present invention is to stabilize the support state of the cylinder that is the driven system even when the contact of the concavo-convex member collapses due to the driven system being rapidly rotated by other forces received from other than the driving system. A process cartridge and an image forming apparatus that are equipped with a driving force transmission mechanism that can maintain the alignment accuracy regardless of the size of the backlash between the concavo-convex members and can improve color misregistration. Is to provide.

上記目的は本発明に係るプロセスカートリッジ、及び画像形成装置にて達成される。 The above object is achieved by a process cartridge and an image forming apparatus according to the present invention.

本発明の第1の態様によれば、画像形成装置に着脱可能な像担持体と、駆動源と、駆動源の駆動から回転する第一カップリング部と、像担持体に取付けられ、像担持体と一体に回転する第二カップリング部と、第一カップリング部に設けられ、カップリングする方向に突出している軸部と、第二カップリング部に設けられ、軸部と嵌合する嵌合穴と、を有し、前記第二カップリング部は、カップリングする断面が多角形の形状をした突起であり、前記第一カップリング部はこの断面より大きい形状でねじれた穴であり、この突起とねじれ穴とが噛み合って像担持体に駆動が伝達される画像形成装置において、
ねじれ穴と突起部との位置関係を決めるための軸部はねじれ穴を貫通してねじれ穴から突出すると共に、前記軸部は突起部に設けられた前記嵌合穴に嵌合し、像担持体の内部まで延伸していることを特徴とする画像形成装置が提供される。
According to the first aspect of the present invention, an image carrier that can be attached to and detached from the image forming apparatus, a drive source, a first coupling unit that rotates from the drive of the drive source, and an image carrier that is attached to the image carrier. A second coupling portion that rotates integrally with the body, a shaft portion that is provided in the first coupling portion and protrudes in the coupling direction, and a fitting that is provided in the second coupling portion and engages with the shaft portion. And the second coupling part is a protrusion having a polygonal cross section to be coupled, and the first coupling part is a hole twisted in a shape larger than this cross section, In the image forming apparatus in which the protrusion and the twisted hole mesh with each other and the drive is transmitted to the image carrier,
The shaft portion for determining the positional relationship between the torsion hole and the protruding portion passes through the torsion hole and protrudes from the torsion hole, and the shaft portion is fitted into the fitting hole provided in the protruding portion to carry the image. An image forming apparatus is provided that extends to the inside of the body .

本発明の第2の態様によれば、駆動源と、駆動源の駆動から回転する第一カップリング部とを有する駆動系を備えた画像形成装置本体に着脱可能であって、像担持体と、像担持体と一体に回転する第二カップリング部と、を有し、第二カップリング部は、カップリングする断面が多角形の形状をした突起であり、第一カップリング部はこの断面より大きい形状でねじれた穴であり、この突起とねじれ穴とが噛み合って像担持体に駆動が伝達されるプロセスカートリッジにおいて、
第一カップリング部に設けられ、カップリングする方向に突出している軸部と、第二カップリング部に設けられ、軸部と嵌合する嵌合穴と、を有し、前記軸部と前記穴の嵌合ガタは前記多角形の突起と前記ねじれ穴の嵌合ガタよりも小さく、軸部の嵌合穴への嵌合によりねじれ穴と突起部との位置関係を決め前記突起に設けられた嵌合穴は、前記嵌合穴と嵌合する前記軸部が前記像担持体の内部まで延伸可能な穴形状であることを特徴とするプロセスカートリッジが提供される。
According to the second aspect of the present invention, the image forming apparatus main body having a drive system having a drive source and a first coupling unit that rotates from the drive of the drive source can be attached to and detached from the image carrier. A second coupling portion that rotates integrally with the image carrier, and the second coupling portion is a protrusion having a polygonal cross section to be coupled, and the first coupling portion has a cross section In a process cartridge that is a twisted hole with a larger shape, and the projection and the twisted hole mesh with each other to transmit drive to the image carrier,
A shaft portion provided in the first coupling portion and projecting in the coupling direction; and a fitting hole provided in the second coupling portion and fitted in the shaft portion; and the shaft portion and the fitting play of the hole is smaller than the fitting backlash of the twisted hole and said polygonal projection, determines the positional relationship between the twisted hole and the projection portion by fitting of the fitting hole of the shaft portion, provided in said projection The process cartridge is characterized in that the fitting hole formed has a hole shape in which the shaft portion that fits into the fitting hole can be extended to the inside of the image carrier .

本発明によれば、被駆動側が駆動側以外から受ける他の力によって早回しを受け凹凸部材の当接が崩れた場合であっても、被駆動側である筒体の支持状態を安定に保ち、凹凸部材間の嵌合ガタの大きさによらず調芯精度を維持することが可能であり、従って、色ずれの改善を図ることができ、高品質画像を得ることができる。   According to the present invention, even when the driven side is quickly rotated by other force received from other than the driving side and the contact of the concavo-convex member is broken, the support state of the cylinder on the driven side is stably maintained. Therefore, it is possible to maintain the alignment accuracy regardless of the size of the backlash between the concavo-convex members. Therefore, it is possible to improve the color misregistration and obtain a high quality image.

以下、本発明に係る駆動力伝達機構、プロセスカートリッジ、及び画像形成装置を図面に則して更に詳しく説明する。尚、前出の部材と同一部材には同一符号を付す。   Hereinafter, the driving force transmission mechanism, the process cartridge, and the image forming apparatus according to the present invention will be described in more detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned member.

実施例1
本発明の第1実施例について図1及び図2により説明する。
Example 1
A first embodiment of the present invention will be described with reference to FIGS.

まず、本実施例の画像形成装置について図1により説明する。本実施例の画像形成装置は、中間転写ベルト82を有する電子写真方式のカラー画像形成装置であって、中間転写ベルト82の水平面に沿ってイエロ−、マゼンタ、シアン及びブラック用の画像形成部1、2、3、4が並設されている。尚、図中Y、M、C及びKの添え字表記はイエロ−、マゼンタ、シアン及びブラックを意味する。又、図1では各色の配置を左からY、M、C、及びKとしたが異なる配置順でも構わない。   First, the image forming apparatus of this embodiment will be described with reference to FIG. The image forming apparatus of the present embodiment is an electrophotographic color image forming apparatus having an intermediate transfer belt 82, and the image forming unit 1 for yellow, magenta, cyan and black along the horizontal plane of the intermediate transfer belt 82. 2, 3, 4 are juxtaposed. In the figure, Y, M, C, and K subscripts indicate yellow, magenta, cyan, and black. In FIG. 1, the arrangement of each color is Y, M, C, and K from the left, but different arrangement orders may be used.

各画像形成部1〜4は、それぞれ、像担持体である感光ドラム80Y、80M、80C、80K、帯電装置86Y、86M、86C、86K、不図示の露光装置、及び現像手段81Y、81M、81C、81Kを備えている。   Each of the image forming units 1 to 4 includes photosensitive drums 80Y, 80M, 80C, and 80K as image carriers, charging devices 86Y, 86M, 86C, and 86K, an exposure device (not shown), and developing units 81Y, 81M, and 81C. , 81K.

そして、感光ドラム80Y、80M、80C、80K、帯電装置86Y、86M、86C、86K、及び現像手段81Y、81M、81C、81Kは、それぞれ、図2に示すように、プロセスカートリッジとして一体的にユニット化され、画像形成装置本体に対して不図示の装着手段を介して着脱可能に装着されている。   The photosensitive drums 80Y, 80M, 80C, and 80K, the charging devices 86Y, 86M, 86C, and 86K, and the developing units 81Y, 81M, 81C, and 81K are each united as a process cartridge as shown in FIG. And is detachably mounted on the image forming apparatus main body via a mounting means (not shown).

各感光ドラム80Y、80M、80C、80Kは帯電装置86Y、86M、86C、86Kにより一様に帯電された後、不図示の露光装置により画像情報に応じた潜像が各感光ドラム80Y、80M、80C、80K上に形成され、潜像は各色の現像手段81Y、81M、81C、81Kによりトナー像として顕像化され、各転写装置87Y、87M、87C、87Kの作用によって、駆動ロ−ラ85により矢印B方向に回転する中間転写ベルト82上に順次重ねて一次転写される。その後、二次転写部83において給紙部90、91から矢印Cに示すように搬送される記録媒体である転写材上に一括転写される。そして、一括転写された転写材は定着装置84へ搬送され、フルカラ−の定着画像を得る。   Each of the photosensitive drums 80Y, 80M, 80C, and 80K is uniformly charged by the charging devices 86Y, 86M, 86C, and 86K, and then a latent image corresponding to the image information is formed by the exposure device (not shown) to the photosensitive drums 80Y, 80M, and 80K. The latent images formed on the 80C and 80K are visualized as toner images by the developing means 81Y, 81M, 81C and 81K for the respective colors, and the driving roller 85 is obtained by the action of the transfer devices 87Y, 87M, 87C and 87K. As a result, primary transfer is performed while sequentially superposing on the intermediate transfer belt 82 rotating in the arrow B direction. Thereafter, the secondary transfer unit 83 performs batch transfer onto a transfer material that is a recording medium conveyed as indicated by an arrow C from the paper supply units 90 and 91. The batch-transferred transfer material is conveyed to a fixing device 84 to obtain a full-color fixed image.

本実施例のプロセスカートリッジBは、図2に示すように、感光ドラム80と現像手段81とを現像フレーム112で一体的に構成した現像ユニットDに、帯電手段86、帯電ブラシ111等を帯電フレーム113で一体的に構成した帯電ユニットCを組付けたものである。   As shown in FIG. 2, the process cartridge B of the present embodiment includes a developing unit D in which a photosensitive drum 80 and a developing unit 81 are integrally formed by a developing frame 112, and a charging unit 86, a charging brush 111, and the like as a charging frame. The charging unit C integrally formed by 113 is assembled.

次に、図3により、装置本体に設けられた駆動系について説明する。   Next, the drive system provided in the apparatus main body will be described with reference to FIG.

駆動系Iは、装置本体に設けられたモ−タ11、駆動ギヤ12、ギヤ軸13及び凹型部材14から構成される。駆動源のモ−タ11からの駆動力を受けて駆動ギヤ12が回転し、駆動ギヤ12と同軸の出力軸、即ちギヤ軸13が駆動ギヤ12と一体に回転する。ギヤ軸13は凹型部材14に設けられた嵌合穴14aと嵌合し凹型部材14を貫通する。ここで、ギヤ軸13の嵌合部L及び凹型部材14の嵌合穴14aは共に断面が円周の一部をカットされたD型とする等して互いに一体に回転可能に支持される。   The drive system I includes a motor 11, a drive gear 12, a gear shaft 13, and a concave member 14 provided in the apparatus main body. The drive gear 12 rotates in response to the drive force from the motor 11 of the drive source, and the output shaft coaxial with the drive gear 12, that is, the gear shaft 13 rotates integrally with the drive gear 12. The gear shaft 13 is fitted into a fitting hole 14 a provided in the concave member 14 and penetrates the concave member 14. Here, both the fitting portion L of the gear shaft 13 and the fitting hole 14a of the concave member 14 are supported so as to be rotatable integrally with each other, for example, by a D-shaped cross-section with a part of the circumference cut.

凹型部材14は軸方向の一端部側に、断面が多角形(例えば正三角形;図7参照)のねじれた穴(以下、「ねじれ穴」という)50を有し、ギヤ軸13に取付けられた状態においてねじれ穴50の中心とギヤ軸13の回転中心軸は一致する。ねじれ穴50を凹型部材14に設けることで、凹型部材14の交換によりねじれ穴50の形状を容易に変更することができる。又、ギヤ軸13の外径によらずねじれ穴50の大きさを設定できる。   The concave member 14 has a twisted hole (hereinafter referred to as “twisted hole”) 50 having a polygonal cross section (for example, equilateral triangle; see FIG. 7) on one end portion side in the axial direction, and is attached to the gear shaft 13. In the state, the center of the torsion hole 50 coincides with the rotation center axis of the gear shaft 13. By providing the torsion hole 50 in the concave member 14, the shape of the torsion hole 50 can be easily changed by replacing the concave member 14. Further, the size of the torsion hole 50 can be set regardless of the outer diameter of the gear shaft 13.

更に、ギヤ軸13は凹型部材14を挟む位置に2つの緊締溝13a、13bを有し、この緊締溝13a、13bにE型止め輪15、17がはめられる。ドラム側E型止め輪15により凹型部材14の位置決めを行なう。これによって、後述する多角形の突起10とねじれ穴50の係合位置を規定できる。一方、駆動ギヤ側E型止め輪17は付勢手段であるばね性部材16の取付け部となる。このように、駆動ギヤ側E型止め輪17と凹型部材14の間にばね性部材16が介装され、ドラム側E型止め輪15に対して凹型部材14を付勢する。これによって、凹型部材14をギヤ軸13の軸方向に対して移動可能とし、駆動系Iの回転方向を切換えることでねじれを利用し凹凸部材を確実かつ容易に係合させ、又外すことができる。尚、緊締溝13a、13bとE型止め輪15、17を用いる代わりにギヤ軸13の軸径を一部大きくした鍔部分を設けても構わない。   Further, the gear shaft 13 has two tightening grooves 13a and 13b at positions where the concave member 14 is sandwiched, and E-type retaining rings 15 and 17 are fitted into the tightening grooves 13a and 13b. The concave member 14 is positioned by the drum side E-type retaining ring 15. Thereby, the engagement position of the polygonal protrusion 10 and the torsion hole 50 to be described later can be defined. On the other hand, the drive gear side E-type retaining ring 17 serves as an attachment portion for the spring member 16 as urging means. Thus, the spring-like member 16 is interposed between the drive gear side E-type retaining ring 17 and the concave-shaped member 14, and urges the concave-shaped member 14 against the drum-side E-type retaining ring 15. Accordingly, the concave member 14 can be moved with respect to the axial direction of the gear shaft 13, and by switching the rotation direction of the driving system I, the concave and convex members can be reliably and easily engaged and removed by using the twist. . Instead of using the tightening grooves 13a and 13b and the E-type retaining rings 15 and 17, a flange portion in which the shaft diameter of the gear shaft 13 is partially enlarged may be provided.

次に、被駆動系IIについて説明する。被駆動体である筒体としての感光ドラム80(80Y、80M、80C、80K)はその長手方向両端にドラムフランジを備えている。一端は不図示のドラムフランジであり、感光ドラム80を回転可能に支持する。他端は、凹型部材14のねじれ穴50と嵌合する多角形(例えば正三角形)の突起10と一体に構成されたドラムフランジ18である。つまり、ねじれ穴50と多角形の突起10をカップリングとして利用する。又、ドラムフランジ18はその中心に凹型部材14から突出した、ギヤ軸13の延長部(軸部材)130と嵌合する貫通穴19を有する。ギヤ軸13の延長部130と貫通穴19が嵌合することにより感光ドラム80の支持を補助し、より確実な支持状態を得ることができる。尚、感光ドラム80は、前述のように、プロセスカ−トリッジの形態で画像形成装置本体に対してセットされ、保守・交換等の目的により着脱可能に支持される。   Next, the driven system II will be described. The photosensitive drum 80 (80Y, 80M, 80C, 80K) as a cylinder that is a driven body includes drum flanges at both ends in the longitudinal direction. One end is a drum flange (not shown), and rotatably supports the photosensitive drum 80. The other end is a drum flange 18 that is integrally formed with a polygonal (for example, equilateral triangle) protrusion 10 that fits into the torsion hole 50 of the concave member 14. That is, the torsion hole 50 and the polygonal protrusion 10 are used as a coupling. Further, the drum flange 18 has a through hole 19 at the center thereof, which protrudes from the concave member 14 and fits with an extension (shaft member) 130 of the gear shaft 13. The extension portion 130 of the gear shaft 13 and the through hole 19 are fitted to assist the support of the photosensitive drum 80, and a more reliable support state can be obtained. As described above, the photosensitive drum 80 is set on the image forming apparatus main body in the form of a process cartridge and is detachably supported for the purpose of maintenance and replacement.

ここで、ねじれ穴及び突起の断面形状において、多角形として正三角形を選んだ場合について説明する。   Here, the case where a regular triangle is selected as the polygon in the cross-sectional shapes of the twist hole and the protrusion will be described.

駆動側に設けられた断面が正三角形のねじれ穴50に対し被駆動側に設けられた正三角形の突起10が嵌合し(以下、「凹凸部嵌合」という)、モ−タ11からの駆動により駆動ギヤ12、ギヤ軸13及び凹型部材14が一体に回転する。このとき、ギヤ軸13の延長部130とドラムフランジ側の穴19も同時に嵌合した状態(以下、「軸穴嵌合」という)となる。ねじれ穴50の中心がギヤ軸13の回転中心軸上に位置するよう凹型部材14を取付け、ギヤ軸13の延長部130と嵌合する穴19の中心を正三角形の突起10の中心軸上に位置させる。ねじれ穴50と正三角形の突起10は断面が互いに相似な正三角形であることから、回転によって互いに等しく三点で当接する(図9(b)に示された状態)。つまり、感光ドラム80は装置本体側に引き込まれ位置決めされると同時に、ねじれ穴50と多角形の突起10は自動的に互いの軸中心が一致するように調芯される。このとき、調芯されたねじれ穴50と正三角形の突起10の軸中心はギヤ軸13の回転中心軸上に存在することになり、軸穴嵌合が自動調芯機能を妨げることはない。尚、本実施例のようにギヤ軸13を凹型部材14に貫通させ嵌合軸として利用することで、更に駆動系と被駆動系の同軸精度を出し易くできる。   The equilateral triangular protrusion 10 provided on the driven side is fitted into the twisted hole 50 having the equilateral triangular cross section provided on the driving side (hereinafter referred to as “concave portion fitting”). By driving, the drive gear 12, the gear shaft 13, and the concave member 14 rotate integrally. At this time, the extension 130 of the gear shaft 13 and the hole 19 on the drum flange side are also fitted together (hereinafter referred to as “shaft hole fitting”). The concave member 14 is attached so that the center of the torsion hole 50 is located on the rotation center axis of the gear shaft 13, and the center of the hole 19 that fits the extension 130 of the gear shaft 13 is on the center axis of the equilateral triangular protrusion 10. Position. Since the torsion hole 50 and the equilateral triangular protrusion 10 are equilateral triangles whose cross sections are similar to each other, they are brought into contact with each other at three points equally by the rotation (the state shown in FIG. 9B). That is, the photosensitive drum 80 is drawn into the apparatus main body side and positioned, and at the same time, the twist hole 50 and the polygonal protrusion 10 are automatically aligned so that their axial centers coincide. At this time, the axial center of the aligned twist hole 50 and the equilateral triangular protrusion 10 exists on the rotation center axis of the gear shaft 13, and the shaft hole fitting does not hinder the automatic alignment function. In addition, by using the gear shaft 13 as a fitting shaft through the concave member 14 as in the present embodiment, it is possible to further increase the coaxial accuracy of the drive system and the driven system.

又、軸穴嵌合のガタを凹凸部嵌合のガタよりも小さくする。これによって、凹凸部嵌合のガタの大きさによらず、感光ドラムの半径方向(以下、「ラジアル方向」という)の最大ガタは軸穴嵌合のガタで規制される。従って、軸穴嵌合のガタを感光ドラム80の回転に支障がない範囲で出来る限り小さく設計することで、中間転写ベルト82等の外乱により感光ドラム80が早回しを受けても、ラジアル方向変位をほとんど発生させることなく調芯精度を維持でき、駆動力伝達精度の劣化を最小限に抑えることができる。更に、凹凸部嵌合ガタは大きくすることが可能であるため、ねじれ穴50と多角形の突起10の係合性を向上させ、カ−トリッジとしての操作性を向上させることができる。   Further, the backlash for fitting the shaft hole is made smaller than the backlash for fitting the concave and convex portions. Accordingly, the maximum play in the radial direction of the photosensitive drum (hereinafter referred to as “radial direction”) is regulated by the play in the shaft hole fitting, regardless of the size of the play in the concave and convex portions. Accordingly, the shaft hole fitting play is designed to be as small as possible within a range that does not hinder the rotation of the photosensitive drum 80, so that even if the photosensitive drum 80 is rapidly rotated due to disturbance of the intermediate transfer belt 82 or the like, the radial displacement Therefore, the alignment accuracy can be maintained with almost no occurrence of squeezing, and the deterioration of the driving force transmission accuracy can be minimized. Further, since the unevenness fitting backlash can be increased, the engagement between the twist hole 50 and the polygonal protrusion 10 can be improved, and the operability as a cartridge can be improved.

又、ギヤ軸13の延長部130先端にテ−パ形状部98を設けることにより軸穴嵌合をしやすくし、カ−トリッジ装着時におけるガイド効果をもたせることができる。   Further, by providing the taper-shaped portion 98 at the tip of the extension portion 130 of the gear shaft 13, the shaft hole can be easily fitted, and a guide effect can be provided when the cartridge is mounted.

尚、本実施例では多角形の突起としたが、ねじれ穴50と同じ割合でねじれた多角形の突起としてもよい。この場合、駆動力伝達時における両者の当接形態は点からねじれた稜線に変わることから、当接面の増加による感光ドラムの引き込み効果の増大及び二軸間の結合力強化を図ることができる。   In this embodiment, the polygonal projection is used, but a polygonal projection twisted at the same rate as the twisted hole 50 may be used. In this case, since the contact form of the two during transmission of the driving force changes from a point to a twisted ridgeline, the effect of pulling in the photosensitive drum by increasing the contact surface and the strengthening of the coupling force between the two axes can be achieved. .

本実施例では、本発明の駆動力伝達機構を画像形成装置における感光ドラム駆動に適用した場合について説明したが、その他の回転体の駆動力伝達機構としても使用可能である。   In this embodiment, the case where the driving force transmission mechanism of the present invention is applied to the photosensitive drum driving in the image forming apparatus has been described. However, the driving force transmission mechanism of the present invention can also be used as a driving force transmission mechanism for other rotating bodies.

又、本実施例ではモ−タ11から駆動ギヤ12を介して駆動力を伝達する構成としたが、駆動ギヤ12を介さずモ−タ11の出力軸とギヤ軸13を直結する構成であっても構わない。   In this embodiment, the driving force is transmitted from the motor 11 via the drive gear 12. However, the output shaft of the motor 11 and the gear shaft 13 are directly connected without using the drive gear 12. It doesn't matter.

実施例2
次に、本発明の第2実施例について図4を用いて説明する。
Example 2
Next, a second embodiment of the present invention will be described with reference to FIG.

第1実施例ではギヤ軸13の延長部130を軸穴嵌合用の軸として利用するのに対し、本実施例では軸穴嵌合用の軸を別部材とする。   In the first embodiment, the extension 130 of the gear shaft 13 is used as a shaft hole fitting shaft, whereas in this embodiment, the shaft hole fitting shaft is a separate member.

図4において、駆動系Iは、装置本体に設けられたモ−タ11、駆動ギヤ12、ギヤ軸13及び凹型部材14から構成される。凹型部材14とギヤ軸13は連結部材90によって連結され、凹型部材14はギヤ軸13の先端に取付けられる。連結部材90は一端部に穴92と凹型部材14を先端で位置決めするための鍔部94を有し、他端部にはギヤ軸13と嵌合する嵌合穴95を有する。尚、連結部材90とギヤ軸13は締結部材93等により固定される。又、連結部材90は断面が円周の一部をカットされたD型とする等して凹型部材14が一体に回転できるようになっている。   In FIG. 4, the drive system I includes a motor 11, a drive gear 12, a gear shaft 13, and a concave member 14 provided in the apparatus main body. The concave member 14 and the gear shaft 13 are connected by a connecting member 90, and the concave member 14 is attached to the tip of the gear shaft 13. The connecting member 90 has a hole 92 at one end and a flange 94 for positioning the concave member 14 at the tip, and a fitting hole 95 that fits the gear shaft 13 at the other end. The connecting member 90 and the gear shaft 13 are fixed by a fastening member 93 or the like. Further, the connecting member 90 is configured such that the concave member 14 can rotate integrally, for example, by a D-shaped section whose cross section is partially cut.

凹型部材14は第1実施例の場合と同様、感光ドラム80と対向する側の軸方向一端に断面が多角形のねじれ穴50を有する。ここで、駆動ギヤ12、ギヤ軸13、連結部材90に設けられた穴92及びねじれ穴50の各中心軸は全て同軸であり、一体に回転する。又、第1実施例の場合と同様にばね性部材16により凹型部材14は付勢され、軸方向に移動可能である。   As in the case of the first embodiment, the concave member 14 has a twist hole 50 having a polygonal cross section at one axial end on the side facing the photosensitive drum 80. Here, the central axes of the drive gear 12, the gear shaft 13, the hole 92 provided in the connecting member 90, and the torsion hole 50 are all coaxial and rotate together. Similarly to the case of the first embodiment, the concave member 14 is urged by the spring member 16 and can move in the axial direction.

一方、被駆動系IIは両端にドラムフランジを有する感光ドラム80、及びこれを含む装置本体から着脱可能なプロセスカ−トリッジである。ドラムフランジのうちねじれ穴50と対向する側のドラムフランジ18は、ねじれ穴50と嵌合する多角形の突起10と一体である。又、多角形の突起10の中心軸と同軸に連結部材90に設けられた穴92と嵌合する軸部材91を設ける。軸部材91の一部は多角形の突起10の端面から突出した状態となる。このとき、軸部材91の突出長さを穴92の深さよりも短くすることで、装置本体に引き込まれた感光ドラム80の位置決めが多角形の突起10の端面とねじれ穴50の底面の突き当てにより行なわれる。尚、軸部材91はドラムフランジ18に圧入又は接着等により固定され、感光ドラム80と一体に回転する。又、第1実施例と同様に、軸部材91と穴92の嵌合ガタを凹凸部嵌合のガタよりも小さくする。   On the other hand, the driven system II is a photosensitive drum 80 having drum flanges at both ends, and a process cartridge detachable from the apparatus main body including the photosensitive drum 80. The drum flange 18 on the side facing the torsion hole 50 in the drum flange is integral with the polygonal protrusion 10 that fits in the torsion hole 50. In addition, a shaft member 91 that fits into a hole 92 provided in the connecting member 90 is provided coaxially with the central axis of the polygonal protrusion 10. A part of the shaft member 91 protrudes from the end face of the polygonal protrusion 10. At this time, by making the protruding length of the shaft member 91 shorter than the depth of the hole 92, the positioning of the photosensitive drum 80 drawn into the apparatus main body is abutted between the end surface of the polygonal protrusion 10 and the bottom surface of the torsion hole 50. It is done by. The shaft member 91 is fixed to the drum flange 18 by press-fitting or bonding, and rotates together with the photosensitive drum 80. Similarly to the first embodiment, the backlash of the shaft member 91 and the hole 92 is made smaller than the backlash of the concave and convex portion.

以上の構成により、第1実施例と同様、中間転写ベルト82等の外乱により感光ドラム80が早回しを受けてもラジアル方向変位をほとんど発生させることなく調芯精度を維持でき、駆動力伝達精度の劣化を最小限に抑えることができる。又、軸部材91の先端にテ−パ形状部98を設けることによりカ−トリッジ装着時におけるガイド効果をもたせることができる。   With the above configuration, as in the first embodiment, alignment accuracy can be maintained with almost no radial displacement even if the photosensitive drum 80 is rapidly rotated due to disturbance of the intermediate transfer belt 82 or the like, and driving force transmission accuracy can be maintained. Can be minimized. Further, by providing the taper-shaped portion 98 at the tip of the shaft member 91, a guide effect can be provided when the cartridge is mounted.

又、軸部材91のように嵌合軸を別部品とすることで軸をより摺動性や強度に優れた材質に変更可能となる。更に、軸穴嵌合のガタ量も軸を交換することで容易に変更及び調節ができる。   Further, by making the fitting shaft as a separate part like the shaft member 91, the shaft can be changed to a material having more excellent slidability and strength. Furthermore, the backlash amount of the shaft hole fitting can be easily changed and adjusted by exchanging the shaft.

更に、本実施例では、軸部材91は多角形の突起10から突出する形で設けたが、反対にねじれ穴50の底面から突出する構成をとることも可能であり、同様の効果が得られる。   Further, in the present embodiment, the shaft member 91 is provided so as to protrude from the polygonal protrusion 10, but it can also be configured to protrude from the bottom surface of the torsion hole 50, and the same effect can be obtained. .

尚、第1実施例の場合と同様、本実施例における多角形の突起はねじれ穴50と同じ割合でねじれた多角形の突起としてもよい。   As in the case of the first embodiment, the polygonal protrusion in this embodiment may be a polygonal protrusion twisted at the same rate as the twisted hole 50.

又、本実施例では多角形の突起10を被駆動側に、ねじれ穴50を駆動側に設けたが、取付け側をそれぞれ逆にしても同様の効果が得られる。   In this embodiment, the polygonal protrusion 10 is provided on the driven side and the torsion hole 50 is provided on the driving side. However, the same effect can be obtained even if the mounting side is reversed.

以上説明したように、本発明のプロセスカートリッジ、及び画像形成装置は、像担持体が多角形の突起とねじれ穴の嵌合により駆動系に対して着脱可能であって、互いに嵌合した前記多角形の突起と前記ねじれ穴の複数の点、又は面における当接により前記駆動系の駆動力を被駆動系に伝達し、前記ねじれ穴側は長手方向に突出した軸部材を有し、前記多角形の突起側は前記軸部材と嵌合する穴を有することにより、被駆動側が駆動側以外から受ける他の力によって早回しを受け凹凸部材の当接が崩れた場合であっても、被駆動側である像担持体の支持状態を安定に保ち、凹凸部材間の嵌合ガタの大きさによらず調芯精度を維持することが可能であり、従って、色ずれの改善を図ることができ、高品質画像を得ることができる。 As described above, in the process cartridge and the image forming apparatus according to the present invention, the image carrier can be attached to and detached from the drive system by fitting the polygonal protrusion and the twisted hole, and the above-mentioned multiple cartridges fitted to each other can be attached. The driving force of the drive system is transmitted to the driven system by contact with a plurality of points or surfaces of the square protrusion and the torsion hole, and the torsion hole side has a shaft member protruding in the longitudinal direction, and the multiple The square projection side has a hole that fits with the shaft member, so that the driven side can be driven even when the driven side is quickly rotated by other forces received from other than the driving side and the contact of the concavo-convex member is broken. It is possible to maintain a stable support state of the image carrier on the side and maintain alignment accuracy regardless of the size of the backlash between the concavo-convex members, and therefore, it is possible to improve color misregistration. High quality images can be obtained.

本発明に係る画像形成装置の一実施例を示す概略構成図である。1 is a schematic configuration diagram illustrating an embodiment of an image forming apparatus according to the present invention. 本発明に係るプロセスカートリッジの一実施例を示す断面図である。It is sectional drawing which shows one Example of the process cartridge which concerns on this invention. 本発明に係る駆動力伝達機構の一実施例を示す断面図である。It is sectional drawing which shows one Example of the driving force transmission mechanism which concerns on this invention. 本発明に係る駆動力伝達機構の他の実施例を示す断面図である。It is sectional drawing which shows the other Example of the driving force transmission mechanism which concerns on this invention. 通し軸による感光ドラムの駆動方法を説明するための図である。It is a figure for demonstrating the drive method of the photosensitive drum by a through shaft. カップリングによる感光ドラムの駆動方法を説明するための図である。It is a figure for demonstrating the drive method of the photosensitive drum by coupling. 凹凸型の噛み合わせを利用したカップリングを示す説明図である。It is explanatory drawing which shows the coupling using uneven | corrugated type | mold engagement. 断面が多角形のねじれ穴とねじれ多角形の突起の噛み合わせを利用したカップリングを説明するための図である。It is a figure for demonstrating the coupling using the mesh | engagement of the twist hole with a polygonal cross section, and the protrusion of a twist polygon. 図8の凹凸部材の当接による自動調芯を説明するための図である。It is a figure for demonstrating the automatic alignment by contact | abutting of the uneven | corrugated member of FIG.

符号の説明Explanation of symbols

10 多角形の突起
11 モータ(駆動源)
13 出力軸
13a、13b 緊締溝(取付け部)
14 凹型部材
16 ばね性部材(付勢手段)
19 貫通穴
50 多角形のねじれ穴
80 感光ドラム(筒体・電子写真感光体)
98 テーパ形状部
130 出力軸の延長部(軸部材)
I 駆動系
II 被駆動系
10 Polygonal projection 11 Motor (drive source)
13 Output shaft 13a, 13b Tightening groove (Mounting part)
14 Concave member 16 Spring member (biasing means)
19 Through hole 50 Polygonal twist hole 80 Photosensitive drum (Cylinder / Electrophotographic photosensitive member)
98 Tapered portion 130 Output shaft extension (shaft member)
I Drive system II Driven system

Claims (15)

画像形成装置に着脱可能な像担持体と、駆動源と、駆動源の駆動から回転する第一カップリング部と、像担持体に取付けられ、像担持体と一体に回転する第二カップリング部と、第一カップリング部に設けられ、カップリングする方向に突出している軸部と、第二カップリング部に設けられ、軸部と嵌合する嵌合穴と、を有し、前記第二カップリング部は、カップリングする断面が多角形の形状をした突起であり、前記第一カップリング部はこの断面より大きい形状でねじれた穴であり、この突起とねじれ穴とが噛み合って像担持体に駆動が伝達される画像形成装置において、
ねじれ穴と突起部との位置関係を決めるための軸部はねじれ穴を貫通してねじれ穴から突出すると共に、前記軸部は突起部に設けられた前記嵌合穴に嵌合し、像担持体の内部まで延伸していることを特徴とする画像形成装置。
An image carrier that can be attached to and detached from the image forming apparatus, a drive source, a first coupling unit that rotates from driving of the drive source, and a second coupling unit that is attached to the image carrier and rotates integrally with the image carrier. A shaft portion that is provided in the first coupling portion and protrudes in the coupling direction, and a fitting hole that is provided in the second coupling portion and engages with the shaft portion . The coupling part is a protrusion having a polygonal cross-section to be coupled, and the first coupling part is a hole twisted in a shape larger than the cross-section, and the protrusion and the twist hole are meshed to carry an image. In an image forming apparatus in which driving is transmitted to a body,
The shaft portion for determining the positional relationship between the torsion hole and the protruding portion passes through the torsion hole and protrudes from the torsion hole, and the shaft portion is fitted into the fitting hole provided in the protruding portion to carry the image. An image forming apparatus, wherein the image forming apparatus extends to the inside of the body .
前記軸部及び前記嵌合穴は、いずれも中心軸が前記多角形の突起、又は前記ねじれ穴のうち取付け側の中心軸に対して同軸であることを特徴とする請求項1の画像形成装置。 2. The image forming apparatus according to claim 1, wherein a central axis of each of the shaft portion and the fitting hole is coaxial with a polygonal protrusion or a central axis on the mounting side of the torsion hole. . 前記ねじれ穴を有する部材は軸方向の付勢手段により前記多角形の突起に対して相対的に軸方向の移動が可能であり、前記軸部は前記付勢手段の取付け部を有することを特徴とする請求項1または請求項2のいずれかに記載の画像形成装置。 The member having the twisted hole can be moved in the axial direction relative to the polygonal protrusion by an axial biasing means, and the shaft portion has a mounting portion for the biasing means. The image forming apparatus according to claim 1 or 2 . 前記軸部は前記ねじれ穴に取付けられ一体的に回転可能であることを特徴とする請求項1から3のいずれかの項に記載の画像形成装置。 The image forming apparatus according to claim 1, wherein the shaft portion is attached to the torsion hole and is integrally rotatable. 前記軸部は前記駆動源から前記像担持体に駆動力を伝達する出力軸の一部であることを特徴とする請求項1からのいずれかの項に記載の画像形成装置。 The shaft portion is an image forming apparatus according to any one of claims 1 4, characterized in that a part of the output shaft for transmitting the driving force to the image bearing member from said driving source. 前記軸部はその先端にテーパ形状部を有することを特徴とする請求項1からのいずれかの項に記載の画像形成装置。 The shaft portion is an image forming apparatus according to any one of claims 1 5, characterized in that it has a tapered portion at its distal end. 前記多角形の突起は前記ねじれ穴と同じ割合でねじれた形状を有することを特徴とする請求項1からのいずれかの項に記載の画像形成装置。 The image forming apparatus according to any one of claims to 6 claim 1 wherein the polygonal projections, characterized in that it has a twisted shape at the same rate as the twist bore. 駆動源と、駆動源の駆動から回転する第一カップリング部とを有する駆動系を備えた画像形成装置本体に着脱可能であって、像担持体と、像担持体と一体に回転する第二カップリング部と、を有し、第二カップリング部は、カップリングする断面が多角形の形状をした突起であり、第一カップリング部はこの断面より大きい形状でねじれた穴であり、この突起とねじれ穴とが噛み合って像担持体に駆動が伝達されるプロセスカートリッジにおいて、
第一カップリング部に設けられ、カップリングする方向に突出している軸部と、第二カップリング部に設けられ、軸部と嵌合する嵌合穴と、を有し、前記軸部と前記穴の嵌合ガタは前記多角形の突起と前記ねじれ穴の嵌合ガタよりも小さく、軸部の嵌合穴への嵌合によりねじれ穴と突起部との位置関係を決め前記突起に設けられた嵌合穴は、前記嵌合穴と嵌合する前記軸部が前記像担持体の内部まで延伸可能な穴形状であることを特徴とするプロセスカートリッジ。
The image forming apparatus main body having a drive system having a drive source and a drive system having a first coupling portion that rotates from the drive of the drive source can be attached to and detached from the image carrier, and the image carrier is rotated integrally with the image carrier. A coupling portion, and the second coupling portion is a protrusion having a polygonal cross-section to be coupled, and the first coupling portion is a hole twisted in a shape larger than the cross-section. In the process cartridge in which the protrusion and the torsion hole mesh with each other and the drive is transmitted to the image carrier,
A shaft portion provided in the first coupling portion and projecting in the coupling direction; and a fitting hole provided in the second coupling portion and fitted in the shaft portion; and the shaft portion and the fitting play of the hole is smaller than the fitting backlash of the twisted hole and said polygonal projection, determines the positional relationship between the twisted hole and the projection portion by fitting of the fitting hole of the shaft portion, provided in said projection The process cartridge , wherein the fitting hole has a hole shape in which the shaft portion fitted to the fitting hole can be extended to the inside of the image carrier .
前記軸部及び前記嵌合穴は、いずれも中心軸が前記多角形の突起又は前記ねじれ穴のうち取付け側である方の中心軸に対して同軸であることを特徴とする請求項のプロセスカートリッジ。 9. The process according to claim 8 , wherein the shaft portion and the fitting hole are coaxial with respect to a central axis whose central axis is the mounting side of the polygonal protrusion or the twist hole. cartridge. 前記軸部は前記ねじれ穴を有する部材を軸方向に位置決めする手段を有することを特徴とする請求項8または請求項9のいずれかに記載のプロセスカートリッジ。 10. The process cartridge according to claim 8, wherein the shaft portion includes means for positioning a member having the torsion hole in an axial direction. 11. 前記ねじれ穴を有する部材は軸方向の付勢手段により前記多角形の突起に対して相対的に軸方向の移動が可能であり、前記軸部は前記付勢手段の取付け部を有することを特徴とする請求項10のプロセスカートリッジ。 The member having the twisted hole can be moved in the axial direction relative to the polygonal protrusion by an axial biasing means, and the shaft portion has a mounting portion for the biasing means. The process cartridge according to claim 10 . 前記軸部は前記駆動源から前記像担持体に駆動力を伝達する出力軸の一部であることを請求項8から11のいずれかの項に記載のプロセスカートリッジ。 12. The process cartridge according to claim 8, wherein the shaft portion is a part of an output shaft that transmits a driving force from the driving source to the image carrier . 前記多角形の突起は前記ねじれ穴と同じ割合でねじれた形状を有することを特徴とする請求項から12のいずれかの項に記載のプロセスカートリッジ。 The process cartridge according to any one of claims 8 to 12 , wherein the polygonal protrusion has a shape twisted at the same ratio as the twist hole. 前記像担持体は電子写真感光体であることを特徴とする請求項から13のいずれかの項に記載のプロセスカートリッジ。 The process cartridge according to any one of claims 8 13, characterized in that said image bearing member is an electrophotographic photosensitive member. 更に、帯電手段、現像手段、クリーニング手段のうち少なくとも一つを有することを特徴とする請求項14のプロセスカートリッジ。 15. The process cartridge according to claim 14 , further comprising at least one of a charging unit, a developing unit, and a cleaning unit.
JP2005329377A 2005-11-14 2005-11-14 Process cartridge and image forming apparatus Expired - Fee Related JP4366355B2 (en)

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