JP6551788B2 - Drive transmission device and image forming apparatus - Google Patents

Drive transmission device and image forming apparatus Download PDF

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JP6551788B2
JP6551788B2 JP2015194262A JP2015194262A JP6551788B2 JP 6551788 B2 JP6551788 B2 JP 6551788B2 JP 2015194262 A JP2015194262 A JP 2015194262A JP 2015194262 A JP2015194262 A JP 2015194262A JP 6551788 B2 JP6551788 B2 JP 6551788B2
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groove
hole
drive transmission
rotating body
driven
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JP2017068077A5 (en
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弘晃 仁枝
弘晃 仁枝
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Ricoh Co Ltd
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Description

本発明は、駆動伝達装置および画像形成装置に関するものである。   The present invention relates to a drive transmission device and an image forming apparatus.

第一回転体と第二回転体とを連結する連結部材を備えた駆動伝達装置が知られている。   There is known a drive transmission device including a connecting member that connects a first rotating body and a second rotating body.

特許文献１には、上記連結部材として、次のような連結部材を備える駆動伝達装置が記載されている。第一回転体の回転中心の穴部に挿入される第一挿入部と、第二回転体の凹部に挿入される第二挿入部と、第一と第二挿入部とを繋ぐ円柱状の連結部とを備えた連結部材である。第一挿入部は、球状部と、この球状部の外周面から径方向に突出する第一突起部とを備えている。第二挿入部は、球状部と、この球状部の外周面から径方向に突出する第二突起部とを備えている。第一挿入部の第一突起部は、回転方向に１８０°の間隔を開けて２つ設けられており、第一回転体の穴部の内周面に回転方向に１８０°の間隔を開けて設けられた軸方向に延びる第一溝部に係合する。また、第二挿入部の第二突起部は、回転方向に１８０°の間隔を開けて２つ設けられており、第二回転体の凹部の内周面に回転方向に１８０°の間隔を開けて設けられた軸方向に延びる第二溝部に係合する。また、この駆動伝達装置には、連結部材の第一挿入部が、第一回転体の穴部から抜け出すのを規制する規制部材が設けられている。   Patent Document 1 describes a drive transmission device including the following connecting member as the connecting member. A cylindrical connection that connects the first insertion portion inserted into the hole at the rotation center of the first rotating body, the second insertion portion inserted into the recess of the second rotating body, and the first and second insertion portions. And a connecting member. The first insertion portion includes a spherical portion and a first protrusion that protrudes in the radial direction from the outer peripheral surface of the spherical portion. The second insertion portion includes a spherical portion and a second protrusion that protrudes in the radial direction from the outer peripheral surface of the spherical portion. Two first protrusions of the first insertion portion are provided with an interval of 180 ° in the rotation direction, and an interval of 180 ° is provided in the rotation direction on the inner peripheral surface of the hole portion of the first rotation body. Engaging with the provided axially extending first groove. Further, two second protrusions of the second insertion portion are provided at an interval of 180 ° in the rotational direction, and are spaced at an interval of 180 ° in the rotational direction on the inner peripheral surface of the recess of the second rotary body. It engages with a second axially extending groove provided. The drive transmission device is also provided with a regulating member that regulates the first insertion portion of the connecting member from coming out of the hole of the first rotating body.

また、本出願人は、次のような構成の駆動伝達装置を開発中である。すなわち、第一溝部を第一回転体の第二回転体側端部まで延ばさずに、途中で止めている。これにより、第一突起部が第一溝部の第二回転体側端部に突き当たり、第一挿入部の第一回転体の穴部からの抜け出しを防止している。また、穴部の第二回転体側端部の、上記第一溝部形成位置とは、回転方向で異なる位置に第一突起部が挿入される開口を有し、この開口から軸方向に延びる案内溝が、第一回転体の穴部に形成されている。また、穴部の内部に、案内溝と第一溝部とを連通させる連通部を有している。   In addition, the applicant is developing a drive transmission apparatus having the following configuration. That is, the first groove portion is stopped halfway without extending to the second rotary body side end of the first rotary body. As a result, the first projection abuts against the second rotary body side end of the first groove and prevents the first insertion portion from coming out of the hole of the first rotary body. In addition, the guide groove extending in the axial direction from the opening has an opening into which the first protrusion is inserted at a position different from the first groove portion forming position at the second rotating body side end portion of the hole portion. Is formed in the hole of the first rotating body. Moreover, the communication part which makes a guide groove and a 1st groove part connect is provided inside the hole part.

第一挿入部を第一回転体の穴部に挿入するときは、まず、第一回転体の穴部にコイルスプリングを挿入する。次に、第一突起部が案内溝に挿入されるように、案内溝と第一突起部との回転方向の位相合わせて、第一挿入部の球状部を第一回転体の穴部に挿入する。すると、第一突起部が案内溝に挿入される。次に、コイルスプリングの付勢力に抗して、第一挿入部を第一穴部内に押し入れる。次に、第一突起部が連通部に到達したら、連結部材を回転させる。すると、第一突起部が、連通部を通って案内溝から第一溝部へ移動し、第一突起部が第一溝部に位置する。このように、第一突起部を第一溝部に位置したら、連結部材から手を離す。すると、コイルスプリングの付勢力により連結部材が第二回転体側へ移動し、第一突起部が第一溝部の上記案内溝との連通箇所よりも第二回転側に位置する。これにより、連結部材が第一回転体に組み付けられる。   When inserting the first insertion portion into the hole of the first rotating body, first, a coil spring is inserted into the hole of the first rotating body. Next, the spherical portion of the first insertion portion is inserted into the hole portion of the first rotary body by aligning the rotational direction of the guide groove and the first protrusion so that the first protrusion is inserted into the guide groove. To do. Then, the first protrusion is inserted into the guide groove. Next, the first insertion portion is pushed into the first hole against the biasing force of the coil spring. Next, when the first protrusion reaches the communicating portion, the connecting member is rotated. Then, the first protrusion moves from the guide groove to the first groove through the communication portion, and the first protrusion is positioned in the first groove. Thus, when the first protrusion is positioned in the first groove, the hand is released from the connecting member. Then, the connecting member moves to the second rotating body side by the urging force of the coil spring, and the first projecting portion is positioned on the second rotating side with respect to the communication portion of the first groove portion with the guide groove. Thereby, the connecting member is assembled to the first rotating body.

第二回転体を軸方向に移動させることで、連結部材の第二挿入部を第二回転体の凹部に挿入し、第二回転体を連結部材に組みつける。このとき、第二溝部と第二突起部との回転方向の位相が合っておらず第二回転体の凹部に第二挿入部が挿入されないときは、連結部材が第二回転体で押し込まれ、第一挿入部がコイルスプリングを圧縮しながら第一回転体の穴部内を移動する。これにより、第二回転体の凹部に第二挿入部が挿入されていなくても、第二回転体を装置内の所定の位置に位置させることができる。そして、駆動伝達時に連結部材または第二回転体が回転駆動すると、第二突起部と第二溝部との位相が合う。すると、連結部材がコイルスプリングの付勢力により第二回転体側へ移動し、第二突起部が第二溝部に入り込み、第二挿入部が、第二回転体の凹部に入り込む。これにより、第二回転体が連結部材に組みつけられ、連結部材と第二回転体との間で駆動力が伝達される。   By moving the second rotating body in the axial direction, the second insertion portion of the connecting member is inserted into the recess of the second rotating body, and the second rotating body is assembled to the connecting member. At this time, when the second insertion portion is not inserted into the concave portion of the second rotating body because the phase in the rotational direction of the second groove portion and the second protrusion is not matched, the connecting member is pushed in by the second rotating body, The first insertion portion moves in the hole of the first rotating body while compressing the coil spring. Thereby, even if the 2nd insertion part is not inserted in the recessed part of a 2nd rotary body, a 2nd rotary body can be located in the predetermined position in an apparatus. Then, when the coupling member or the second rotating body is rotationally driven during the drive transmission, the phases of the second projection and the second groove are aligned. Then, the connecting member moves to the second rotating body side by the urging force of the coil spring, the second protrusion enters the second groove, and the second insertion part enters the recess of the second rotating body. Thus, the second rotating body is assembled to the connecting member, and the driving force is transmitted between the connecting member and the second rotating body.

近年、装置の小型化の要求が高まっており、軸方向において、第二回転体を第一回転体になるべく近く配置したいという要望があり、連結部材を短くする必要がある。しかし、上記開発中の駆動伝達装置においては、連結部材を十分に短くすることができなかった。   In recent years, there has been an increasing demand for miniaturization of the device, and there is a demand for arranging the second rotating body as close as possible to the first rotating body in the axial direction, and it is necessary to shorten the connecting member. However, in the drive transmission device under development, the connecting member can not be made sufficiently short.

上記課題を解決するために、本発明は、回転中心に穴部を有する第一回転体と、回転中心に穴部を有する第二回転体と、前記第一回転体の穴部の内周面に設けられた軸方向に延びる第一溝部と、前記第二回転体の穴部の内周面に設けられた軸方向に延びる第二溝部と、前記第一溝部に係合する径方向に突出した第一突起部を有し、前記第一回転体の穴部に挿入される第一挿入部、前記第二溝部に係合する径方向に突出した第二突起部を有し、前記第二回転体の穴部に挿入される第二挿入部、および、前記第一挿入部と前記第二挿入部と繋ぐ連結部を有し、前記第一回転体と前記第二回転体とを連結する連結部材とを備えた駆動伝達装置であって、前記第一挿入部が、前記第一回転体の穴部内を軸方向に移動可能であり、前記第一溝部の形成位置とは、回転方向で異なる位置で前記第一突起部が前記第一回転体の穴部に挿入可能であり、前記第一溝部の形成位置とは回転方向で異なる位置で穴部に挿入された第一突起部が、穴部の内部で前記第一溝部に位置することができ、かつ、第一溝部に位置した後、第二回転体側へ前記第一溝部内を前記第一突起部が移動できるように、第一回転体の穴部および第一溝部を構成し、前記第二挿入部の最大外径を、前記第一回転体の穴部の内径よりも小さくしたことを特徴とするものである。   In order to solve the above problems, the present invention relates to a first rotating body having a hole at the center of rotation, a second rotating body having a hole at the center of rotation, and an inner peripheral surface of the hole of the first rotating body. A first groove portion extending in the axial direction provided on the inner surface, a second groove portion extending in the axial direction provided on an inner peripheral surface of the hole portion of the second rotating body, and a radial protrusion engaging with the first groove portion. A first insertion portion that is inserted into the hole of the first rotating body, a second projection portion that protrudes in the radial direction and engages with the second groove portion, A second insertion portion that is inserted into the hole of the rotating body, and a connecting portion that connects the first inserting portion and the second inserting portion, and connects the first rotating body and the second rotating body; A drive transmission device comprising a connecting member, wherein the first insertion portion is movable in the axial direction within the hole of the first rotating body, and the first groove portion is formed. The first projection can be inserted into the hole of the first rotating body at a different position in the rotational direction, and is inserted into the hole at a different position in the rotational direction than the formation position of the first groove. The first protrusion can be positioned in the first groove inside the hole, and after being positioned in the first groove, the first protrusion moves in the first groove toward the second rotating body. The hole portion and the first groove portion of the first rotating body are configured so that the maximum outer diameter of the second insertion portion is smaller than the inner diameter of the hole portion of the first rotating body. It is.

本発明によれば、連結部材の長さを短くしても、連結部材を第一回転体に組み付けることができる。   According to the present invention, the connection member can be assembled to the first rotating body even if the length of the connection member is shortened.

実施形態に係る電子写真方式の画像形成装置の一例を示す概略構成図。FIG. 1 is a schematic configuration view showing an example of an electrophotographic image forming apparatus according to an embodiment. 駆動伝達装置の分解斜視図。The disassembled perspective view of a drive transmission apparatus. 駆動伝達装置の断面図。Sectional drawing of a drive transmission apparatus. 連結部材の斜視図。The perspective view of a connection member. 図４のＡ−Ａ断面図。AA sectional drawing of FIG. 連結部材の肉抜きの従来例を示す図。The figure which shows the prior art example of lightening of a connection member. 本実施形態の連結部材の成型例を示す図。The figure which shows the example of shaping | molding of the connection member of this embodiment. 感光体ギヤと連結部材を示す斜視図。FIG. 5 is a perspective view showing a photosensitive gear and a connecting member. 感光体ギヤと連結部材とを示す断面斜視図。FIG. 2 is a cross-sectional perspective view showing a photosensitive gear and a connecting member. 連結部材と、駆動側筒状部との寸法関係を説明する図。The figure explaining the dimensional relationship of a connection member and a drive side cylindrical part. 連結部材を回転させて、各駆動側突起部を、連通部を通して駆動側溝部へ移動させる様子を示す断面斜視図。The cross-sectional perspective view which shows a mode that a connection member is rotated and each drive side projection part is moved to a drive side groove part through a communication part. 連結部材が感光体ギヤに取り付けらた様子を示す斜視図。FIG. 7 is a perspective view showing the connecting member attached to the photosensitive gear. 軸受けの斜視図。The perspective view of a bearing. 軸受けの規制突起部による規制について説明する断面斜視図。The cross-sectional perspective view explaining the control by the control projection part of a bearing. カップリング部材の斜視図。The perspective view of a coupling member. カップリング部材の断面斜視図。Sectional perspective view of a coupling member. カップリング部材の従動側筒状部に連結部材の従動側球状部を挿入した状態を示す断面斜視図。The cross-sectional perspective view which shows the state which inserted the driven-side spherical part of the connection member in the driven-side cylindrical part of the coupling member. カップリング部材と連結部材とを従動側突起部の突出方向と直交する方向に切った断面図。Sectional drawing which cut the coupling member and the connection member in the direction orthogonal to the protrusion direction of a driven-side projection part. カップリング部材と連結部材とを従動側突起部の突出方向と平行に切った断面図。Sectional drawing which cut the coupling member and the connection member in parallel with the protrusion direction of a driven-side projection part. 従来の連結部材とカップリング部材との駆動伝達について説明する図。The figure explaining the drive transmission of the conventional connection member and coupling member. 図２０の状態から９０°回転させた状態を示す図。The figure which shows the state rotated 90 degrees from the state of FIG. 本実施形態の連結部材とカップリング部材との駆動伝達について説明する図。The figure explaining the drive transmission of the connection member and coupling member of this embodiment. 図２２の状態から９０°回転させた状態を示す図。The figure which shows the state rotated 90 degrees from the state of FIG. 従来の構成において、ドラム軸の軸中心を感光体ギヤの回転軸に対して所定量ずらして連結させたときの感光体ドラムの速度変動を調べたグラフ。6 is a graph in which fluctuations in the speed of the photosensitive drum are investigated when the shaft center of the drum shaft is shifted by a predetermined amount with respect to the rotating shaft of the photosensitive gear in a conventional configuration. 本実施形態の構成において、ドラム軸の軸中心を感光体ギヤの回転軸に対して所定量ずらして連結させたときの感光体ドラムの速度変動を調べたグラフ。6 is a graph in which the fluctuation of the speed of the photosensitive drum is examined when the center of the drum shaft is shifted by a predetermined amount with respect to the rotational axis of the photosensitive gear in the configuration of the present embodiment. 駆動側突起部および従動側突起部の変形例を示す図。The figure which shows the modification of a drive-side projection part and a driven-side projection part.

以下、本発明を適用した画像形成装置の実施形態について説明する。図１は、実施形態に係る電子写真方式の画像形成装置の一例を示す概略構成図である。同図において、タンデム型中間転写式の画像形成装置の本体１は、記録材である用紙を収容して供給する記録材供給手段としての給紙部である給紙テーブル２００上に載せられている。図中の符号の添え字Ｙ、Ｍ、Ｃ、Ｋはそれぞれ、イエロー、マゼンタ、シアン、ブラック（黒）の各色をそれぞれ示す。   Hereinafter, an embodiment of an image forming apparatus to which the present invention is applied will be described. FIG. 1 is a schematic configuration view showing an example of an electrophotographic image forming apparatus according to the embodiment. In FIG. 1, a main body 1 of an image forming apparatus of a tandem type intermediate transfer type is placed on a paper feed table 200 that is a paper feed unit as a recording material supply unit that accommodates and supplies paper that is a recording material. . The subscripts Y, M, C, and K in the figure indicate yellow, magenta, cyan, and black (black) colors, respectively.

画像形成装置の本体１の中央付近には、複数の支持ローラ１３，１４，１５，１６，６３に掛け回されて図中時計回りに回転搬送可能な無端ベルト状の像担持体である中間転写体としての中間転写ベルト１０が設けられている。図示の例では、支持ローラの１つである二次転写対向ローラ１６の左に中間転写ベルト用のクリーニング装置１７が設けられている。クリーニング装置１７は、画像転写後に中間転写ベルト１０上に残留する残留トナーを除去する。また、支持ローラ１４と支持ローラ１５間に張り渡した中間転写ベルト１０上には、その搬送方向に沿って、４つのトナー像形成ユニット１８Ｙ，１８Ｍ，１８Ｃ，１８Ｋを横に並べて配置してタンデム画像形成装置２０を構成する。   In the vicinity of the center of the main body 1 of the image forming apparatus, an intermediate transfer is an endless belt-like image carrier that is looped around a plurality of support rollers 13, 14, 15, 16, and 63 and can be rotated and conveyed clockwise in the figure. An intermediate transfer belt 10 as a body is provided. In the illustrated example, a cleaning device 17 for the intermediate transfer belt is provided to the left of the secondary transfer counter roller 16 that is one of the support rollers. The cleaning device 17 removes residual toner remaining on the intermediate transfer belt 10 after image transfer. Further, on the intermediate transfer belt 10 stretched between the support roller 14 and the support roller 15, four toner image forming units 18Y, 18M, 18C, and 18K are arranged side by side along the transport direction in tandem. The image forming apparatus 20 is configured.

タンデム画像形成装置２０の上には、図１に示すように、光書込手段としての光書込装置である露光装置２１が設けられている。タンデム画像形成装置２０の各トナー像形成ユニット１８Ｙ，１８Ｍ，１８Ｃ，１８Ｋは、イエロー、マゼンタ、シアン、ブラックの各色の潜像が形成される像担持体としての感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋを有している。感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋそれぞれの表面は、帯電装置６０Ｙ，６０Ｍ，６０Ｃ，６０Ｋで一様に帯電された後、画像データに基づいて露光装置２１で露光される。これにより、感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋそれぞれの表面に潜像が形成される。   On the tandem image forming apparatus 20, as shown in FIG. 1, an exposure device 21 that is an optical writing device as an optical writing unit is provided. The toner image forming units 18Y, 18M, 18C, and 18K of the tandem image forming apparatus 20 are photosensitive drums 40Y, 40M, and 40C as image carriers on which latent images of yellow, magenta, cyan, and black are formed. 40K. The surfaces of the photosensitive drums 40Y, 40M, 40C, and 40K are uniformly charged by the charging devices 60Y, 60M, 60C, and 60K, and then exposed by the exposure device 21 based on the image data. Thus, latent images are formed on the surfaces of the photosensitive drums 40Y, 40M, 40C, and 40K.

感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋの潜像はそれぞれ、現像装置６１Ｙ，６１Ｍ，６１Ｃ，６１Ｋで現像され、これにより、感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋそれぞれの表面に可視像である各色のトナー像が担持される。また、感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋから中間転写ベルト１０にトナー像を転写する一次転写位置には、一次転写ローラ６２Ｙ，６２Ｍ，６２Ｃ，６２Ｋが設けられている。また、支持ローラ１４は中間転写ベルト１０を回転駆動する駆動ローラである。ブラック単色画像を中間転写ベルト１０上に形成する場合には、支持ローラ１４以外の支持ローラ１３，１５を移動させて、イエロー、マゼンタ、シアンの感光体ドラム４０Ｙ，４０Ｍ，４０Ｃを中間転写ベルト１０から離間させることも可能である。   The latent images on the photoconductive drums 40Y, 40M, 40C, and 40K are developed by the developing devices 61Y, 61M, 61C, and 61K, respectively, so that visible images are formed on the surfaces of the photoconductive drums 40Y, 40M, 40C, and 40K, respectively. A toner image of a certain color is carried. In addition, primary transfer rollers 62Y, 62M, 62C, and 62K are provided at primary transfer positions for transferring the toner image from the photosensitive drums 40Y, 40M, 40C, and 40K to the intermediate transfer belt 10. Further, the support roller 14 is a drive roller that rotationally drives the intermediate transfer belt 10. When a black single-color image is formed on the intermediate transfer belt 10, the support rollers 13 and 15 other than the support roller 14 are moved, and the yellow, magenta, and cyan photosensitive drums 40Y, 40M, and 40C are moved to the intermediate transfer belt 10. It is also possible to separate from

中間転写ベルト１０を挟んでタンデム画像形成装置２０と反対の側には、二次転写装置２２を備える。二次転写装置２２は、図示の例では、二次転写対向ローラ１６に二次転写ローラ１２を押し当て転写電界を印加することにより、中間転写ベルト１０上の画像を用紙に転写する。   A secondary transfer device 22 is provided on the side opposite to the tandem image forming device 20 with the intermediate transfer belt 10 interposed therebetween. In the illustrated example, the secondary transfer device 22 presses the secondary transfer roller 12 against the secondary transfer opposing roller 16 and applies a transfer electric field to transfer the image on the intermediate transfer belt 10 to the sheet.

二次転写装置２２の横には、用紙上の転写画像を定着する定着手段としての定着装置２５が設けられている。定着装置２５は、記録材搬送部材としての無端ベルトである定着ベルト２６に加圧部材としての加圧ローラ２７を押し当てて構成する。また、支持ローラ２３に掛け回されて回転駆動される記録材搬送部材である搬送ベルト２４により、画像転写後の用紙が定着装置２５へ搬送される。   Next to the secondary transfer device 22, a fixing device 25 as a fixing unit for fixing a transferred image on a sheet is provided. The fixing device 25 is configured by pressing a pressure roller 27 as a pressure member against a fixing belt 26 which is an endless belt as a recording material conveying member. Further, the sheet after image transfer is conveyed to the fixing device 25 by a conveying belt 24 which is a recording material conveying member that is wound around the support roller 23 and rotated.

なお、図示の例では、二次転写装置２２および定着装置２５の下に、上述したタンデム画像形成装置２０と平行に、用紙の両面に画像を記録すべく用紙を反転する用紙反転装置２８を備える。   In the illustrated example, a sheet reversing device 28 is provided under the secondary transfer device 22 and the fixing device 25 in parallel with the above-described tandem image forming device 20 for reversing the sheet to record an image on both sides of the sheet. .

上記構成の画像形成装置において、画像形成装置の本体１に画像データが送られ、作像開始の信号を受けると、駆動モータで支持ローラ１４を回転駆動して他の複数の支持ローラを従動回転し、中間転写ベルト１０を回転搬送する。同時に、個々のトナー像形成ユニット１８Ｙ，１８Ｍ，１８Ｃ，１８Ｋで各感光体ドラム４０Ｙ，４０Ｍ，４０Ｃ，４０Ｋ上にそれぞれ、イエロー、マゼンタ、シアン、ブラックの単色画像を形成する。そして、中間転写ベルト１０の搬送とともに、それらの単色画像を一次転写ローラ６２Ｙ，６２Ｍ，６２Ｃ，６２Ｋが対向する一次転写部で順次転写して中間転写ベルト１０上に合成カラー画像を形成する。   In the image forming apparatus having the above configuration, when image data is sent to the main body 1 of the image forming apparatus and a signal to start image formation is received, the support roller 14 is rotationally driven by the drive motor to rotate the other support rollers. The intermediate transfer belt 10 is rotated and conveyed. At the same time, single toner images of yellow, magenta, cyan and black are formed on the photosensitive drums 40Y, 40M, 40C and 40K, respectively, by the individual toner image forming units 18Y, 18M, 18C and 18K. Then, along with the conveyance of the intermediate transfer belt 10, these single-color images are sequentially transferred at the primary transfer portions opposed to the primary transfer rollers 62 </ b> Y, 62 </ b> M, 62 </ b> C, and 62 </ b> K to form a composite color image on the intermediate transfer belt 10.

また、給紙部の給紙テーブル２００の給紙ローラ５８の１つを選択回転し、ペーパーバンク４３に多段に備える給紙カセット４４の１つから用紙を繰り出し、分離ローラ４５で１枚ずつ分離して給紙路４６に入れる。搬送ローラ４７で搬送して画像形成装置の本体１内の給紙路４８に導き、レジストローラ４９に突き当てて止める。または、給紙ローラ５０を回転して手差しトレイ５１上の用紙を繰り出し、分離ローラで１枚ずつ分離して手差し給紙路５３に入れ、同じくレジストローラ４９に突き当てて止める。そして、中間転写ベルト１０上の合成カラー画像にタイミングを合わせてレジストローラ４９を回転し、中間転写ベルト１０と二次転写装置２２の二次転写ローラ１２との間に用紙を送り込み、二次転写装置２２で転写して用紙上にカラー画像を記録する。画像転写後の用紙は、二次転写装置２２で搬送して定着装置２５へと送り込まれ、熱と圧力とを加えて転写画像を定着した後、排出ローラ５６で排出し、排紙トレイ５７上にスタックする。または、切換爪で切り換えて用紙反転装置２８に入れ、そこで反転して再び二次転写位置へと導き、裏面にも画像を記録した後、排出ローラ５６で排紙トレイ５７上に排出する。   Further, one of the paper feed rollers 58 of the paper feed table 200 of the paper feed unit is selectively rotated, and a sheet is fed out from one of the paper feed cassettes 44 provided in multiple stages in the paper bank 43 and separated one by one by the separation roller 45 Into the paper feed path 46. The image is conveyed by the conveyance roller 47 and guided to the paper feed path 48 in the main body 1 of the image forming apparatus, and is abutted against the registration roller 49 and stopped. Alternatively, the sheet feed roller 50 is rotated to feed the sheet on the manual feed tray 51, and the sheets are separated one by one by the separation roller and put into the manual feed path 53 and similarly hit against the registration roller 49 and stopped. Then, the registration roller 49 is rotated in time with the composite color image on the intermediate transfer belt 10, and the sheet is fed between the intermediate transfer belt 10 and the secondary transfer roller 12 of the secondary transfer device 22 to perform secondary transfer. The apparatus 22 transfers and records a color image on a sheet. The paper after the image transfer is conveyed by the secondary transfer device 22 and sent to the fixing device 25. After the transfer image is fixed by applying heat and pressure, the paper is discharged by the discharge roller 56 and is discharged onto the discharge tray 57. Stack to. Alternatively, it is switched by the switching claw and put into the paper reversing device 28, where it is reversed and led again to the secondary transfer position, an image is recorded on the back side, and then discharged onto the discharge tray 57 by the discharge roller 56.

一方、画像転写後の中間転写ベルト１０は、中間転写ベルト用のクリーニング装置１７により、画像転写後に中間転写ベルト１０上に残留する残留トナーが除去され、タンデム画像形成装置２０による再度の画像形成に備える。   On the other hand, after the image transfer, the intermediate transfer belt 10 is removed of residual toner remaining on the intermediate transfer belt 10 after image transfer by the cleaning device 17 for the intermediate transfer belt, and image formation by the tandem image forming apparatus 20 is performed again. Prepare.

以上の構成たる画像形成装置において、本体１のフロント側（図１中紙面手前側）には、本体１に対して支軸によって回動し開閉可能に取り付けられフロントカバーが設けられている。そして、このフロントカバーを支軸を中心に回動させて本体１に対し開くことにより、本体１の内部に収納された、感光体ドラムと帯電装置と現像装置とクリーニング装置とを１つのユニットとして着脱することができる。感光体ドラム４０と帯電装置と現像装置とクリーニング装置とのうち、寿命となる部品があった際にはユニットごと取り外され、新しいユニットと交換される。そのため、画像形成装置本体の駆動源としての駆動モータから、感光体ドラム４０などの駆動伝達対象の回転体へ駆動力を伝達する駆動伝達装置には、両者を着脱可能に連結する連結部材が設けられている。   In the image forming apparatus having the above-described configuration, a front cover is provided on the front side of the main body 1 (the front side in FIG. 1) by being pivoted with respect to the main body 1 by a support shaft. Then, by rotating the front cover about the support shaft and opening it with respect to the main body 1, the photosensitive drum, the charging device, the developing device, and the cleaning device housed in the main body 1 are combined into one unit. It can be attached and detached. Of the photosensitive drum 40, the charging device, the developing device, and the cleaning device, when there is a component that has reached the end of its life, the unit is removed and replaced with a new unit. Therefore, a drive transmission device that transmits a driving force from a drive motor as a drive source of the image forming apparatus main body to a rotating body that is a target of transmission transmission such as the photosensitive drum 40 is provided with a connecting member that detachably connects the two. It is done.

なお、本実施形態においては、感光体ドラム４０に駆動を伝達する駆動伝達装置を例に挙げて説明するが、駆動伝達対象が、現像装置に設けられた現像ローラやトナー補給スクリュ、給紙テーブル２００の給紙ローラ５８給紙ローラなど別の回転体であっても良い。   In this embodiment, a drive transmission device that transmits drive to the photosensitive drum 40 will be described as an example. However, a drive transmission target is a developing roller, a toner supply screw, and a paper feed table provided in the developing device. Another roller may be used, such as the 200 paper feed roller 58 paper feed roller.

図２は、駆動伝達装置７０の分解斜視図であり、図３は、駆動伝達装置７０の断面図である。
駆動伝達装置７０は、駆動モータから駆動力が伝達される第一回転体たる感光体ギヤ８２、感光体ドラムのドラム軸４０ａの端部に取り付けられた第二回転体たるカップリング部材４１、感光体ギヤ８２とカップリング部材４１とを駆動連結する連結部材９０、感光体ギヤ８２に取り付けられた連結部材９０をカップリング部材側へ付勢するコイルスプリング７３などを備えている。 FIG. 2 is an exploded perspective view of the drive transmission device 70, and FIG. 3 is a cross-sectional view of the drive transmission device 70.
The drive transmission device 70 includes a photosensitive member gear 82 serving as a first rotating member to which the driving force is transmitted from the driving motor, a second rotating member coupling member 41 attached to an end of the drum shaft 40 a of the photosensitive member drum, A connecting member 90 for driving and connecting the body gear 82 and the coupling member 41, and a coil spring 73 for urging the connecting member 90 attached to the photosensitive member gear 82 toward the coupling member are provided.

感光体ギヤ８２の回転中心には連結部材９０の第一挿入部９０ａが挿入される駆動側筒状部８２ａを有している。カップリング部材４１は、ドラム軸４０ａの先端部分が挿入される筒状の軸挿入部４１ａと、連結部材の９０の第二挿入部９０ｂが挿入される従動側筒状部４１ｂとを有している。軸挿入部４１ａには、ドラム軸４０ａに設けられた平行ピン４１１が貫通する貫通孔４１２が設けられている。   At the rotational center of the photosensitive gear 82, there is provided a drive side cylindrical portion 82a into which the first insertion portion 90a of the connecting member 90 is inserted. The coupling member 41 includes a cylindrical shaft insertion portion 41a into which the tip end portion of the drum shaft 40a is inserted, and a driven side cylindrical portion 41b into which the second insertion portion 90b of the connecting member 90 is inserted. There is. The shaft insertion portion 41a is provided with a through hole 412 through which a parallel pin 411 provided on the drum shaft 40a passes.

連結部材９０は、第一挿入部９０ａ、第二挿入部９０ｂおよび第一挿入部９０ａと第二挿入部９０ｂとを繋ぐ連結部９３を有している。第一挿入部９０ａは、駆動側球状部９１と駆動側球状部９１の表面から径方向に突出する第一駆動側突起部９４ａと、第二駆動側突起部９４ｂとを有している。第二駆動側突起部９４ａは、第一駆動側突起部９４ｂに対して回転方向に１８０°間隔を開けた位置に設けられている。また、第二挿入部９０ｂは、従動側球状部９と、従動側球状部９２の表面から径方向に突出した２個の従動側突起部９５ａとを有している。各従動側突起部９５ａは、回転方向に１８０°の間隔を開けて設けられている。   The connection member 90 includes a first insertion portion 90a, a second insertion portion 90b, and a connection portion 93 that connects the first insertion portion 90a and the second insertion portion 90b. The first insertion portion 90a includes a driving side spherical portion 91, a first driving side protruding portion 94a protruding in a radial direction from the surface of the driving side spherical portion 91, and a second driving side protruding portion 94b. The second drive-side protrusion 94 a is provided at a position 180 ° apart in the rotational direction from the first drive-side protrusion 94 b. The second insertion portion 90 b includes a driven side spherical portion 9 and two driven side projections 95 a that protrude in the radial direction from the surface of the driven side spherical portion 92. The driven protrusions 95a are provided at an interval of 180 ° in the rotational direction.

図４は、連結部材９０の斜視図であり、図５は、図４のＡ−Ａ断面図である。
以下の説明では、軸方向をＸ方向、駆動側突起部および従動突起部の突出方向をＹ方向、Ｘ方向およびＹ方向いずれにも直交する方向をＺ方向として説明する。
連結部材９０は、樹脂成型品であり、第一挿入部９０ａ、第二挿入部９０ｂ、連結部９３は、樹脂材料からなる一体物である。連結部材９０の形成に用いられる樹脂としては、機械的強度に優れ、耐摩耗性、摺動性がよいポリアセタール樹脂（ＰＯＭ）を好適に用いることができる。 FIG. 4 is a perspective view of the connecting member 90, and FIG. 5 is a cross-sectional view taken along the line A-A of FIG.
In the following description, the axial direction will be described as the X direction, and the projecting directions of the drive side projection and the driven projection will be described as the Y direction, and a direction orthogonal to both the X direction and the Y direction as the Z direction.
The connection member 90 is a resin molded product, and the first insertion portion 90a, the second insertion portion 90b, and the connection portion 93 are an integral body made of a resin material. As resin used for formation of the connection member 90, polyacetal resin (POM) which is excellent in mechanical strength, and excellent in abrasion resistance and slidability can be used suitably.

連結部材を射出成型などにより成型するためヒケが生じ、そのヒケにより各球状部９１、９２や連結部が変形し、品質に影響が出るおそれがある。このため、本実施形態では、各球状部９１，９２、連結部９３に肉抜きを施し、ヒケの発生を抑えている。   Since the connecting member is molded by injection molding or the like, a sink may occur, and the spherical portions 91 and 92 and the connecting part may be deformed by the sink and the quality may be affected. For this reason, in this embodiment, each spherical part 91,92 and the connection part 93 are thinned, and generation | occurrence | production of sink marks is suppressed.

第一挿入部９０ａの駆動側球状部９１は、Ｘ方向に直交する球の大円である第一駆動側大円部９１ａと、Ｚ方向に直交する球の大円である第二駆動側大円部９１ｂと、Ｙ方向に直交する球の大円である第三駆動側大円部９１ｃとを残して肉抜きした半球形状となっている。また、第二挿入部９０ｂの従動側球状部９２は、Ｘ方向に直交する球の大円である第一従動側大円部９２ａと、Ｚ方向に直交する球の大円である第二従動側大円部９２ｂと、Ｙ方向に直交する球の大円である第三従動側大円部９２ｃとを残して肉抜きした球形状となっている。なお、上記大円とは、球の中心を通る平面が球面と交わってできる円のことである。   The drive side spherical portion 91 of the first insertion portion 90a includes a first drive side great circle portion 91a that is a great circle of a sphere orthogonal to the X direction and a second drive side large circle that is a great circle of a sphere orthogonal to the Z direction. It has a hemispherical shape in which the circular portion 91b and the third driving side large circular portion 91c, which is a large circular sphere orthogonal to the Y direction, are left behind. In addition, the driven-side spherical portion 92 of the second insertion portion 90b is a first driven-side large circle portion 92a which is a large circle of a ball orthogonal to the X direction and a second driven which is a large circle of a ball orthogonal to the Z direction. It has a ball shape which is thin except for the side large circle portion 92b and the third driven side large circle portion 92c which is a large circle of a sphere orthogonal to the Y direction. The great circle is a circle formed by a plane passing through the center of the sphere and the sphere.

また、連結部９３は、略四角柱形状であり、連結部９３の各側面に肉抜きが施された肉抜き部９３ａが設けられている。図５に示すように、肉抜き部９３ａは、図中Ｙ方向に延びる直線部分と、図中Ｚ方向に延びる直線部分とを残して肉抜きされており、断面十字形状となっている。また、連結部は、各側面がＹ方向に対して４５°傾くように形成されている。このように、各側面がＹ方向に対して４５°傾くように形成することで、肉抜き部の直線部分が、四角形の対角線となり、連結部の側面をＹ方向に直交する面と、平行な面となるように形成した場合に比べて、肉抜き部の直線部分を長くすることができる。これにより、肉抜きによる連結部の強度低下を抑えることができる。   In addition, the connecting portion 93 has a substantially quadrangular prism shape, and a lightening portion 93 a is formed on each side surface of the connecting portion 93. As shown in FIG. 5, the lightening portion 93a is lightened leaving a straight portion extending in the Y direction in the drawing and a straight portion extending in the Z direction in the drawing, and has a cross shape in cross section. The connecting portion is formed such that each side surface is inclined 45 ° with respect to the Y direction. Thus, by forming each side surface to be inclined 45 ° with respect to the Y direction, the straight portion of the lightening portion becomes a diagonal of a quadrangle, and the side surface of the connecting portion is parallel to a plane orthogonal to the Y direction. Compared with the case where it forms so that it may become a field, the straight part of a lightening part can be lengthened. Thereby, the strength reduction of the connection part by lightening can be suppressed.

第一挿入部９０ａの駆動側突起部９４ａ，９４ｂは、円柱形状をしており、第一駆動側大円部９１ａ、第二駆動大円部９１ｂとが交差する箇所に設けられている。第一駆動側突起部９４ａの高さｈ２は、従動側突起部９５ａおよび第二駆動側突起部９４ｂの高さｈ１よりも高くなっている。本実施形態では、駆動側球状部９１を半球を肉抜きした形状としているが、連結部材９０の最大傾斜角度に応じて、適宜決めればよい。また、駆動側球状部９１の回転中心には、バネ受け９６が設けられている。   The drive side protrusions 94a and 94b of the first insertion portion 90a have a cylindrical shape, and are provided at locations where the first drive side great circle portion 91a and the second drive great circle portion 91b intersect. The height h2 of the first drive side protrusion 94a is higher than the height h1 of the driven side protrusion 95a and the second drive side protrusion 94b. In the present embodiment, the drive-side spherical portion 91 has a shape obtained by removing the hemisphere, but it may be determined appropriately according to the maximum inclination angle of the connecting member 90. In addition, a spring receiver 96 is provided at the rotation center of the drive side spherical portion 91.

第二挿入部９０ｂの従動側突起部９５ａも、円柱形状をしており、第一従動側大円部９２ａ、第二従動側大円部９２ｂとが交差する箇所に設けられている。従動側球状部の第三従動側大円部９２ｃの第一従動側大円部９２ａよりもカップリング部材側は、第二従動側大円部９２ｂを基準にしてＺ方向一方側（図中左側）にしか形成されておらず、Ｚ方向他方側が切り欠かれたような形状となっている。   The driven-side projection 95a of the second insertion portion 90b also has a cylindrical shape, and is provided at a location where the first driven large-circle portion 92a and the second driven large-circle portion 92b intersect. The coupling member side of the third driven-side large circular portion 92c of the driven-side spherical portion is closer to the one side in the Z direction (left side in the figure) than the second driven-side large circular portion 92b. And the other side in the Z direction is notched.

図６は、連結部材９０の肉抜きの従来例を示す図である。
図６（ａ）に示すように、連結部材９０に駆動側球状部９１側が開口した穴形状の肉抜き部１９３を設けて、連結部材９０の厚みを抑えてヒケを抑制しようとした場合、金型構造としては、図６（ｂ）に示すようになる。すなわち、Ｙ１方向に移動する第一金型３９１と、Ｙ２方向に移動する第二金型３９２と、Ｘ１方向に移動する第三金型３９３とを有する金型構造である。このような肉抜きとした場合、軸方向に長い穴形状の肉抜き部１９３を形成する第三金型３９３を、成型された連結部材から引き抜くために、Ｘ１方向に大きく移動させる必要が生じる。また、第三金型３９３の穴形状の肉抜き部１９３を形成する部分は、強度などの問題で最低φ８ｍｍは必要であり、連結部材９０の小型化を図ることが困難である。 FIG. 6 is a view showing a conventional example of lightening of the connecting member 90. As shown in FIG.
As shown in FIG. 6A, when it is intended to suppress the thickness of the connecting member 90 to suppress the sink mark by providing the hole-shaped thinned portion 193 in which the driving side spherical portion 91 side is opened in the connecting member 90. The mold structure is as shown in FIG. That is, the mold structure has a first mold 391 moving in the Y1 direction, a second mold 392 moving in the Y2 direction, and a third mold 393 moving in the X1 direction. In such a case, it is necessary to move the third die 393 forming the long hole-shaped lighted portion 193 in the axial direction largely in the X1 direction in order to pull it out from the molded connecting member. The portion of the third mold 393 in which the hole-shaped lightening portion 193 is formed needs a minimum of 8 mm in diameter due to problems such as strength, and it is difficult to miniaturize the connecting member 90.

また、穴形状の肉抜き部１９３を設ける従来構成においては、成型された連結部材から第三金型３９３を良好に引き抜くためには、直径が駆動側に向うに連れて徐々に大きくなるような形状の肉抜き部１９３にする必要がある。その結果、図６（ｃ）に示すように、連結部材９０が軸方向に長い形状の場合は、従動側球状部９２を十分に肉抜きできず、従動側球状部９２の厚みｔ２が厚くなり、従動側球状部９２のヒケを十分に抑制できない。従って、図６に示す構成では、従動側球状部９２の厚みｔ２を抑制するには、連結部材の軸方向長さを最長で２５ｍｍ以下に抑える必要がある。   Further, in the conventional configuration in which the hole-shaped thinning portion 193 is provided, in order to satisfactorily pull out the third mold 393 from the molded connecting member, the diameter gradually increases as it goes to the driving side. It is necessary to make the shape of the thin portion 193. As a result, as shown in FIG. 6C, when the connecting member 90 has a shape elongated in the axial direction, the driven-side spherical portion 92 can not be sufficiently thinned, and the thickness t2 of the driven-side spherical portion 92 is increased. The sink of the driven side spherical portion 92 can not be sufficiently suppressed. Therefore, in the configuration shown in FIG. 6, in order to suppress the thickness t2 of the driven-side spherical portion 92, it is necessary to suppress the axial length of the connecting member to 25 mm or less at the longest.

図７は、本実施形態の連結部材９０の成型例を示す図である。
図７（ａ）は、連結部材９０の成型例を示す横断面図であり、図７（ｂ）は、図７（ａ）のＡ−Ａ縦断面図であり、図７（ｃ）は、図７（ａ）のＢ−Ｂ縦断面図である。また、図７（ｄ）は、図７（ａ）のＣ−Ｃ縦断面図である。
肉抜き部９３ａをＹ方向に延びる直線部分とＺ方向に延びる直線部分とからなる断面十字形状とすることにより、図７（ｃ）に示すように、第一金型３９１と第二金型３９２とで形成することができる。また、図７（ｂ）,図７（ｄ）に示すように、各球状部９１,９２の第二大円部９１ｂ,９２ｂ、第三大円部９１ｃ,９２ｃを、連結部の肉抜き部と同様にして第一金型３９１と第二金型３９２とにより成型することができる。これにより、図７（ａ）に示すように、Ｙ１方向に移動する第一金型３９１と、Ｙ２方向に移動する第二金型３９２とで、連結部材９０を成型することができ、図６に示す従来例よりも少ない金型で連結部材９０を成型することができる。また、図６に示した構成に比べて、連結部材の小型化が可能となる。また、連結部材の軸方向長さが長くなっても、従動側球状部、連結部、駆動側球状部の肉厚を均等にすることができる。これにより、連結部材を軸方向に長い形状としても、ヒケの影響による精度低下を抑制することができる。 FIG. 7 is a view showing a molding example of the connection member 90 of the present embodiment.
7 (a) is a cross-sectional view showing a molding example of the connecting member 90, FIG. 7 (b) is an AA longitudinal cross-sectional view of FIG. 7 (a), and FIG. 7 (c) is It is a BB longitudinal cross-sectional view of Fig.7 (a). Moreover, FIG.7 (d) is CC longitudinal cross-sectional view of Fig.7 (a).
As shown in FIG. 7 (c), the first metal mold 391 and the second metal mold 392 are formed by forming the lightening portion 93 a into a cross shape having a straight portion extending in the Y direction and a straight portion extending in the Z direction. And can be formed. Further, as shown in FIGS. 7B and 7D, the second large circular portions 91b and 92b and the third large circular portions 91c and 92c of each of the spherical portions 91 and 92 are divided into thin portions of the connecting portion. In the same manner, the first mold 391 and the second mold 392 can be used for molding. As a result, as shown in FIG. 7A, the connecting member 90 can be molded with the first mold 391 moving in the Y1 direction and the second mold 392 moving in the Y2 direction. The connecting member 90 can be molded with a smaller number of molds than the conventional example shown in FIG. Further, the connecting member can be miniaturized as compared with the configuration shown in FIG. Further, even if the axial length of the connecting member is increased, the thickness of the driven side spherical portion, the connecting portion, and the driving side spherical portion can be made uniform. Thereby, even if it makes a connecting member long shape in an axial direction, the precision fall by the influence of sink marks can be controlled.

本実施形態では、先の図４に示すように、各球状部の各大円部の厚み、連結部の肉抜き部の厚み、図５に示すように、肉抜き部の厚みをを等しくａ［ｍｍ］としている。これにより、各部のヒケによる影響を抑えることができ、連結部材９０を精度よく成型することができる。   In the present embodiment, as shown in FIG. 4 above, the thickness of each large circle of each spherical portion, the thickness of the lightening portion of the connecting portion, and the thickness of the lightening portion as shown in FIG. It is assumed that [mm]. Thereby, the influence of the sink marks of each part can be suppressed, and the connecting member 90 can be molded with high accuracy.

図８は、感光体ギヤ８２と連結部材９０を示す斜視図であり、図９は、感光体ギヤ８２と連結部材９０とを示す断面斜視図である。
感光体ギヤ８２は、ポリアセタール樹脂（ＰＯＭ）からなる樹脂成型品であり、回転中心に連結部材９０の第一挿入部９０ａが挿入される駆動側筒状部８２ａを有している。駆動側筒状部８２ａには、第一挿入部９０ａの駆動側球状部９１が挿入される駆動側穴部８７と、第一挿入部９０ａの駆動側突起部９４ａ,９４ｂが挿入される駆動側溝部８５が回転方向に１８０°の間隔を開けて２つ設けられている。また、駆動側筒状部８２ａには、一方の駆動側溝部８５に回転方向で隣接して、第一駆動側突起部９４ａを案内する第一案内溝部８６ａと、他方の駆動側溝部８５に回転方向で隣接して第二駆動側突起部９４ｂを案内する位相合わせ用溝部たる第二案内溝部８６ｂとを有している。一方の駆動側溝部８５と第一案内溝部８６ａとは、奥側で連通部８４により連通しており、同様に他方の駆動側溝部８５と第二案内溝部８６ｂも奥側で連通部８４により連通している。 FIG. 8 is a perspective view showing the photosensitive gear 82 and the connecting member 90, and FIG. 9 is a cross-sectional perspective view showing the photosensitive gear 82 and the connecting member 90. As shown in FIG.
The photosensitive gear 82 is a resin molded product made of polyacetal resin (POM), and has a drive side cylindrical portion 82a into which the first insertion portion 90a of the connecting member 90 is inserted at the center of rotation. The driving side tubular portion 82a has a driving side hole 87 into which the driving side spherical portion 91 of the first insertion portion 90a is inserted, and a driving side groove into which the driving side protrusions 94a and 94b of the first insertion portion 90a are inserted. Two parts 85 are provided at an interval of 180 ° in the rotational direction. Further, in the drive side cylindrical portion 82a, the first guide groove 86a for guiding the first drive side protrusion 94a adjacent to the one drive side groove 85 in the rotational direction is rotated to the other drive side groove 85 And a second guide groove 86b that is a phase matching groove that guides the second drive side protrusion 94b adjacent to each other in the direction. One drive groove portion 85 and the first guide groove portion 86a communicate with each other by the communication portion 84 at the back side, and similarly, the other drive groove portion 85 and the second guide groove portion 86b are also connected by the communication portion 84 at the back side. doing.

図８に示すように、第一案内溝部８６ａの溝深さｄ２は、第一駆動側突起部９４ａの高さｈ２よりも長くなっている。一方、第二案内溝部８６ｂの溝深さｄ１は、第二駆動側突起部９４ｂの高さｈ1よりも長く、第一駆動側突起部９４ａの高さｈ２よりも短くなっている（ｈ1＜ｄ１＜ｈ２＜ｄ２）。   As shown in FIG. 8, the groove depth d2 of the first guide groove 86a is longer than the height h2 of the first drive side protrusion 94a. On the other hand, the groove depth d1 of the second guide groove 86b is longer than the height h1 of the second drive side protrusion 94b and shorter than the height h2 of the first drive side protrusion 94a (h1 <d1). <H2 <d2).

駆動側溝部８５のカップリング部材側端部（手前側端部）には、抜け止め部８５ａが設けられており、連結部材９０が、駆動側穴部８７のカップリング側端部から抜け出そうとすると、各駆動側突起部９４ａ，９４ｂが、抜け止め部８５ａに突き当たる。これにより、連結部材９０が、駆動側穴部８７のカップリング側端部から抜け出るのを防止することができる。   A retaining portion 85 a is provided at the coupling member side end (front side end) of the drive side groove 85, and the connecting member 90 tries to come out of the coupling side end of the drive side hole 87. Then, the drive-side protrusions 94a and 94b abut against the retaining portions 85a. Thereby, the connecting member 90 can be prevented from coming out of the coupling side end of the drive side hole 87.

また、先の図９に示すように、駆動側筒状部８２ａの奥側端部には、軸受け１００の駆動側溝部内の駆動側突起部が案内溝部へ移動するのを規制する規制突起部１０２（図３参照）が挿入される挿入穴部８３が設けられている。   Further, as shown in FIG. 9, at the rear end of the drive side cylindrical portion 82a, a control projection 102 for restricting the movement of the drive side projection in the drive side groove of the bearing 100 to the guide groove. An insertion hole 83 is provided in which (see FIG. 3) is inserted.

図１０は、連結部材９０と、駆動側筒状部８２ａとの寸法関係を説明する図である。
本実施形態の画像形成装置においては、装置の軸方向の小型化を図るため、連結部材９０の長さを極力短くしたいという要望がある。そこで、本実施形態では、図１０（ｂ）に示すように、第二挿入部９０ｂの回転方向の最大外径Ｒ１を、駆動側筒状部８２ａの内径Ｒ２（より詳しくは、駆動側穴部８７の内径）以下とした。本実施形態のように、各従動側突起部９５ａの高さが同じ場合、第二挿入部９０ｂの最大外径Ｒ１は、各従動側突起部と接する外接円の直径となる。一方、従動側突起部９５ａの高さが互いに異なる場合、第二挿入部９０ｂの回転方向の最大外径Ｒ１は、以下のようになる。すなわち、各従動側突起部のうち、最も高い従動側突起部の回転方向一端から従動側球状部９５ａの中心までの長さの２倍が、第二挿入部９０ｂの回転方向の最大外径となる。このように、第二挿入部９０ｂの最大外径Ｒ１を、駆動側筒状部８２ａの内径Ｒ２以下とすることで、図１０（ａ）に示すように、駆動側突起部９４ａ，９４ｂの従動側端部（カップリング部材側端部）から従動側突起部９５ａの駆動側端部（感光体ギヤ側端部）までの長さＬ１を、駆動側筒状部８２ａの従動側端部から連通部８４までの長さＬ２よりも短かくすることができる。 FIG. 10 is a view for explaining the dimensional relationship between the connecting member 90 and the drive side cylindrical portion 82a.
In the image forming apparatus of the present embodiment, there is a demand to shorten the length of the connecting member 90 as much as possible in order to reduce the size of the apparatus in the axial direction. Therefore, in the present embodiment, as shown in FIG. 10B, the maximum outer diameter R1 of the second insertion portion 90b in the rotational direction is set to the inner diameter R2 of the drive side tubular portion 82a (more specifically, the drive side hole portion 87 inner diameter) or less. As in the present embodiment, when the heights of the driven protrusions 95a are the same, the maximum outer diameter R1 of the second insertion portion 90b is the diameter of the circumscribed circle in contact with the driven protrusions. On the other hand, when the heights of the driven projections 95a are different from each other, the maximum outer diameter R1 in the rotation direction of the second insertion portion 90b is as follows. That is, of each driven-side protrusion, twice the length from one end of the highest driven-side protrusion in the rotation direction to the center of the driven-side spherical portion 95a is the maximum outer diameter in the rotation direction of the second insertion portion 90b. Become. Thus, by making the maximum outer diameter R1 of the second insertion portion 90b equal to or less than the inner diameter R2 of the drive side cylindrical portion 82a, as shown in FIG. 10A, the following of the drive side protrusions 94a and 94b The length L1 from the side end (coupling member side end) to the driving side end (photoreceptor gear side end) of the driven projection 95a is communicated from the driven side end of the driving side cylindrical portion 82a It can be made shorter than the length L2 to the portion 84.

次に、連結部材９０の感光体ギヤ８２への取り付けについて説明する。
まず、図８に示すように、コイルスプリング７３を、駆動側筒状部８２ａの駆動側穴部８７に入れ込む。次に、第一駆動側突起部９４ａが第一案内溝部８６ａに挿入され、第二駆動側突起部９４ｂが第二案内溝部８６ｂに挿入されるように、感光体ギヤ８２に対して連結部材の回転方向位置を調整する。 Next, the attachment of the connecting member 90 to the photosensitive gear 82 will be described.
First, as shown in FIG. 8, the coil spring 73 is inserted into the drive side hole 87 of the drive side cylindrical portion 82a. Next, the first drive projection 94a is inserted into the first guide groove 86a, and the second drive projection 94b is inserted into the second guide groove 86b. Adjust the rotational position.

本実施形態では、第一駆動側突起部９４ａの高さｈ２を位相合わせ用突起部たる第二駆動側突起部９４ｂの高さｈ１よりも長くし、位相合わせ用溝部たる第二案内溝部８６ｂの溝深さを、第一案内溝部８６ａの溝深さよりも浅くし、第一駆動側突起部９４ａの高さｈ２よりも溝深さを短くしている。これにより、第一駆動側突起部９４ａが、第二案内溝部８６ｂに挿入することができず、第二駆動側突起部９４ｂのみ、第二案内溝部８６ｂに挿入することができる。これにより、感光体ギヤ８２に対して規定の位相で連結部材９０を感光体ギヤ８２に取り付けることができる。すなわち、本実施形態では、第二駆動側突起部９４ｂと、第二案内溝部８６ｂとで、第一位相合わせ部を構成している。   In the present embodiment, the height h2 of the first drive side projection 94a is made longer than the height h1 of the second drive side projection 94b that is the phase alignment projection, and the second guide groove 86b that is the phase alignment groove 86b. The groove depth is made shallower than the groove depth of the first guide groove 86a, and the groove depth is made shorter than the height h2 of the first drive-side projection 94a. Accordingly, the first drive side protrusion 94a cannot be inserted into the second guide groove 86b, and only the second drive side protrusion 94b can be inserted into the second guide groove 86b. As a result, the connecting member 90 can be attached to the photosensitive gear 82 at a prescribed phase with respect to the photosensitive gear 82. In other words, in the present embodiment, the second driving side protrusion 94b and the second guide groove 86b constitute a first phase matching portion.

また、位相合わせ突起部たる第二駆動側突起部９４ｂの直径を、第一駆動側突起部９４ａの直径よりも大きくし、第一案内溝部８６ａの溝幅を、第二案内溝部８６ｂの溝幅よりも狭くして、第二駆動側突起部９４ｂの直径よりも短くする構成としてもよい。かかる構成とすることでも、第二駆動側突起部９４ｂが、第二案内溝部８６ｂにのみ挿入可能となり、感光体ギヤに対して規定の位相で連結部材９０を感光体ギヤに取り付けることができる。   Further, the diameter of the second drive side projection 94b, which is the phase matching projection, is made larger than the diameter of the first drive side projection 94a, and the groove width of the first guide groove 86a is the groove width of the second guide groove 86b. It may be made narrower than the diameter of the second drive-side protrusion 94 b. Also with this configuration, the second drive-side protrusion 94b can be inserted only into the second guide groove 86b, and the connecting member 90 can be attached to the photoreceptor gear at a prescribed phase with respect to the photoreceptor gear.

また、位相合わせ突起部たる第二駆動側突起部９４ｂの直径を、第一駆動側突起部の直径よりも小さくし、第二案内溝部８６ｂの溝幅を、第一案内溝部８６ａの溝幅よりも狭くして、第一駆動側突起部９４ａの直径よりも短くする構成としてもよい。かかる構成とすることでも、第二駆動側突起部９４ｂが、第二案内溝部８６ｂにのみ挿入可能となり、感光体ギヤ８２に対して規定の位相で連結部材９０を感光体ギヤ８２に取り付けることができる。   Further, the diameter of the second drive-side projection 94b, which is the phase matching projection, is smaller than the diameter of the first drive-side projection, and the groove width of the second guide groove 86b is greater than the groove width of the first guide groove 86a. It may be made narrower than the diameter of the first drive-side protrusion 94a. Also with this configuration, the second drive-side protrusion 94 b can be inserted only into the second guide groove 86 b, and the connecting member 90 is attached to the photosensitive gear 82 at a prescribed phase with respect to the photosensitive gear 82. it can.

また、第二駆動側突起部９４ｂの駆動伝達に支障をきたさない箇所に凹部を設け、第二案内溝部８６ｂにこの凹部に嵌る凸部を設けることで、第二案内溝部８６ｂの凸部によって、第一駆動側突起部９４ａが第二案内溝部８６ｂに挿入できなくすることができる。これにより、第二駆動側突起部９４ｂが、第二案内溝部８６ｂにのみ挿入可能となり、感光体ギヤ８２に対して規定の位相で連結部材９０を感光体ギヤ８２に取り付けることができる。また、第二駆動側突起部９４ｂの駆動伝達に支障をきたさない箇所に凸部を設け、第二案内溝部８６ｂにこの凸部が嵌る凹部を設けてもよい。   Further, a recess is provided at a location that does not interfere with the drive transmission of the second drive-side protrusion 94b, and a protrusion that fits into the recess is provided in the second guide groove 86b, so that the protrusion of the second guide groove 86b The first drive protrusion 94a can not be inserted into the second guide groove 86b. As a result, the second drive side protrusion 94 b can be inserted only into the second guide groove 86 b, and the connecting member 90 can be attached to the photoconductor gear 82 with a prescribed phase with respect to the photoconductor gear 82. Alternatively, a protrusion may be provided at a location that does not interfere with the drive transmission of the second drive-side protrusion 94b, and a recess in which the protrusion is fitted may be provided in the second guide groove 86b.

次に、第一挿入部９０ａの駆動側球状部９１を駆動側穴部８７に挿入し、第一駆動側突起部９４ａを第一案内溝部８６ａに挿入し、第二駆動側突起部９４ｂを第二案内溝部８６ｂに挿入する。すると、連結部材９０のバネ受け９６がコイルスプリング７３に嵌り込み、連結部材９０にコイルスプリング７３の一端が取り付けられる。そして、第一，第二駆動側突起部９４ａ,９４ｂが、案内溝部と駆動側溝部８５とを連通する連通部８４に位置するまで、コイルスプリング７３の付勢力に抗して連結部材９０を駆動側筒状部８２ａ内に押し入れていく。   Next, the driving side spherical portion 91 of the first insertion portion 90a is inserted into the driving side hole portion 87, the first driving side projection portion 94a is inserted into the first guide groove portion 86a, and the second driving side projection portion 94b is inserted into the first driving groove portion 94b. Insert into the two guide grooves 86b. Then, the spring receiver 96 of the connecting member 90 is fitted into the coil spring 73, and one end of the coil spring 73 is attached to the connecting member 90. Then, the connecting member 90 is driven against the biasing force of the coil spring 73 until the first and second drive-side protrusions 94a and 94b are positioned in the communication portion 84 that connects the guide groove and the drive-side groove 85. Push into the side cylindrical portion 82a.

上述したように、本実施形態では、第二挿入部９０ｂの最大外径Ｒ１を、駆動側筒状部８２ａの内径Ｒ２（より詳しくは、駆動側穴部８７の内径）以下としている。これにより、第二挿入部９０ｂを、駆動側穴部８７に挿入することができる。その結果、画像形成装置の小型化を図るため、駆動側突起部９４ａ，９４ｂの従動側端部（カップリング部材側端部）から従動側突起部９５ａの駆動側端部（感光体ギヤ側端部）までの長さＬ１を、駆動側筒状部８２ａの従動側端部から連通部８４までの長さＬ２よりも短かくすることができる。   As described above, in the present embodiment, the maximum outer diameter R1 of the second insertion portion 90b is equal to or less than the inner diameter R2 of the drive side cylindrical portion 82a (more specifically, the inner diameter of the drive side hole 87). Thereby, the second insertion portion 90 b can be inserted into the drive side hole 87. As a result, in order to miniaturize the image forming apparatus, the drive side end (photoreceptor gear side end) of the driven side projection 95a from the driven side end (coupling member side end) of the drive side projection 94a, 94b Portion L) can be shorter than the length L2 from the driven side end of the drive side cylindrical portion 82a to the communication portion 84.

すなわち、上記Ｌ１を上記Ｌ２よりも短くした場合、駆動側突起部９４ｂを連通部８４に位置させるためには、第二挿入部９０ｂの従動側突起部９５ａの部分まで駆動側筒状部８２ａに挿入する必要がある。本実施形態では、第二挿入部９０ｂの最大外径Ｒ１を、駆動側筒状部８２ａの内径Ｒ２（より詳しくは、駆動側穴部８７の内径）以下としている。そのため、駆動側突起部９４ｂを連通部８４に位置するまで連結部材９０を駆動側筒状部８２ａ内に挿入したとき、図１１に示すように、第二挿入部９０ｂの従動側球状部９２と従動側突起部９５ａとが駆動側穴部８７に挿入される。   That is, when the L1 is shorter than the L2, in order to position the drive side protrusion 94b in the communication portion 84, the drive side cylindrical portion 82a is extended to the portion of the driven side protrusion 95a of the second insertion portion 90b. Need to insert. In the present embodiment, the maximum outer diameter R1 of the second insertion portion 90b is equal to or less than the inner diameter R2 of the drive side cylindrical portion 82a (more specifically, the inner diameter of the drive side hole 87). Therefore, when the connecting member 90 is inserted into the drive side cylindrical portion 82a until the drive side projection 94b is positioned in the communication portion 84, as shown in FIG. 11, the driven side spherical portion 92 of the second insertion portion 90b and The driven projection 95 a is inserted into the driving hole 87.

次に、案内溝部と駆動側溝部８５とを連通する連通部８４に位置するまで連結部材９０を押し入れたら、連結部材９０を回転させ、各駆動側突起部９４ａ，９４ｂを、連通部８４を通って、駆動側溝部８５へ移動させる。   Next, when the connecting member 90 is pushed into the communicating portion 84 which connects the guide groove portion and the driving side groove portion 85, the connecting member 90 is rotated and the driving side protrusions 94a and 94b pass through the communicating portion 84. And move to the drive side groove 85.

第二挿入部９０ｂの形状を、第一挿入部９０ａと同じ形状（合同）としても、第二挿入部９０ｂの従動側球状部９２が駆動側筒状部８２ａの駆動側穴部８７に入り込み、従動側突起部９５ａが、案内溝部に入り込むことで、駆動側突起部９４ｂを連通部８４に位置するまで連結部材９０を駆動側筒状部８２ａ内に挿入することができる。しかしながら、駆動側突起部９４を、案内溝部から駆動側溝部８５へ移動させるべく、連結部材を回転させようとすると、従動側突起部が、案内溝部と駆動側溝部とを仕切る壁に突き当たり、連結部材を回転させることができない。その結果、駆動側突起部９４を、連通部を介して案内溝部から駆動側溝部８５へ移動させることができない。   Even if the second insertion portion 90b has the same shape (congruent) as the first insertion portion 90a, the driven-side spherical portion 92 of the second insertion portion 90b enters the drive-side hole portion 87 of the drive-side cylindrical portion 82a. When the driven side projection 95a enters the guide groove, the connecting member 90 can be inserted into the drive side cylindrical portion 82a until the drive side projection 94b is positioned at the communication portion 84. However, if the connecting member is rotated in order to move the driving side protrusion 94 from the guide groove to the driving side groove 85, the driven side protrusion hits the wall that partitions the guide groove and the driving groove, and is connected. The member can not be rotated. As a result, the drive-side protrusion 94 can not be moved from the guide groove to the drive-side groove 85 through the communication portion.

一方、本実施形態においては、先の図１０（ｂ）に示したように、第二挿入部９０ｂの最大外径Ｒ１を、駆動側筒状部８２ａの内径Ｒ２（より詳しくは、駆動側穴部８７の内径）以下としおり、第二挿入部９０ｂの従動側球状部９２と従動側突起部９５ａとが駆動側穴部８７に挿入される。従って、駆動側筒状部内に第二挿入部９０ｂが挿入された状態で、図１１の矢印αに示す方向に連結部材９０を回転することができる。その結果、連結部材９０を回転させて、各駆動側突起部９４ａ，９４ｂを、連通部８４を通って、駆動側溝部８５へ移動させることができる。   On the other hand, in the present embodiment, as shown in FIG. 10 (b), the maximum outer diameter R1 of the second insertion portion 90b is set to the inner diameter R2 (more specifically, the driving side hole of the driving side cylindrical portion 82a). The driven side spherical portion 92 and the driven side protruding portion 95a of the second insertion portion 90b are inserted into the driving side hole portion 87. Accordingly, the connecting member 90 can be rotated in the direction indicated by the arrow α in FIG. 11 in a state where the second insertion portion 90b is inserted into the drive side cylindrical portion. As a result, the connecting member 90 can be rotated to move the driving side protrusions 94 a and 94 b to the driving side groove 85 through the communication part 84.

このように、本実施形態の連結部材９０においては、駆動側突起部９４ａ，９４ｂの従動側端部（カップリング部材側端部）から従動側突起部９５ａの駆動側端部（感光体ギヤ側端部）までの長さＬ１が、駆動側筒状部８２ａの従動側端部から連通部８４までの長さＬ２よりも短かくても、駆動側突起部９４ａ,９４ｂを駆動側溝部へ移動させることができる。   As described above, in the connecting member 90 of the present embodiment, the driving side end portions (coupling member side end portions) of the driving side protrusion portions 94a and 94b to the driving side end portion (photoconductor gear side) of the driven side protrusion portions 95a. Even if the length L1 to the end portion is shorter than the length L2 from the driven end of the drive side cylindrical portion 82a to the communication portion 84, the drive side protrusions 94a and 94b are moved to the drive side groove It can be done.

また、本実施形態においては、第一挿入部９０ａと第二挿入部９０ｂの形状が、明らかに異なるため、第一挿入部９０ａと第二挿入部９０ｂとを間違えることがない。仮に間違って、第二挿入部９０ｂを駆動側筒状部８２ａに挿入して連結部材９０を、感光体ギヤ８２に取り付けようとしても、従動側突起部が、駆動側溝部に挿入されることがなく、感光体ギヤ８２に連結部材９０を取り付けることができない。これにより、連結部材９０の誤取り付けを防止することができる。   Moreover, in this embodiment, since the shape of the 1st insertion part 90a and the 2nd insertion part 90b is clearly different, the 1st insertion part 90a and the 2nd insertion part 90b are not mistaken. Even if the second insertion portion 90b is inserted into the driving side cylindrical portion 82a and the connecting member 90 is attached to the photosensitive gear 82 by mistake, the driven side projection may be inserted into the driving side groove portion. Otherwise, the connecting member 90 can not be attached to the photosensitive gear 82. Thereby, the erroneous attachment of the connection member 90 can be prevented.

次に、各駆動側突起部９４ａ，９４ｂが、駆動側溝部８５の側面に当接して、連結部材９０の回転が規制されたら、連結部材９０から手を離す。すると、コイルスプリング７３の付勢力により、連結部材９０がカップリング部材側へ移動し、各駆動側突起部９４ａ,９５ｂが、駆動側溝部８５に挿入される。これにより、連結部材９０が感光体ギヤ８２に取り付けられる。そして、この連結部材９０が取り付けられた感光体ギヤ８２を軸受け１００を介して奥側側板１ｂに取り付ける（図３参照）。   Next, when the drive side protrusions 94a and 94b contact the side surface of the drive side groove 85 and the rotation of the connecting member 90 is restricted, the hand is released from the connecting member 90. Then, the connecting member 90 is moved to the coupling member side by the biasing force of the coil spring 73, and the drive side protrusions 94 a and 95 b are inserted into the drive side groove 85. Thus, the connecting member 90 is attached to the photosensitive gear 82. Then, the photoreceptor gear 82 to which the connecting member 90 is attached is attached to the back side plate 1b via the bearing 100 (see FIG. 3).

本実施形態では、上述したように、第一駆動側突起部９４ａの高さと第二駆動側突起部９４ｂの高さとを異ならせ、第二案内溝部８６ｂの溝深さを浅くして、第二案内溝部８６ｂには、第二駆動側突起部９４ｂのみ、挿入できるようにしている。これにより、感光体ギヤに対して規定の位相で連結部材９０が感光体ギヤに取り付けられる。その結果、図１２に示すように、第二案内溝部８６ｂに対し、常に図中時計周りに角度γ回転した位置に、従動側球状部の第三従動側大円部９２ｃが位置するように、連結部材９０が、感光体ギヤ８２に取り付けられる。   In the present embodiment, as described above, the height of the first drive side protrusion 94a and the height of the second drive side protrusion 94b are made different, the groove depth of the second guide groove 86b is made shallow, and the second Only the second drive side protrusion 94 b can be inserted into the guide groove 86 b. Thus, the connecting member 90 is attached to the photosensitive gear at a prescribed phase with respect to the photosensitive gear. As a result, as shown in FIG. 12, the third driven side large circle portion 92c of the driven side spherical portion is positioned at a position where the angle γ by the second guide groove 86b is always rotated clockwise in the drawing. A connecting member 90 is attached to the photoreceptor gear 82.

各駆動側突起部９４ａ,９４ｂが、駆動側溝部８５に挿入されると、各駆動側突起部９４が抜け止め部８５ａと対向し、上述したように連結部材９０が感光体ギヤ８２から抜け出すのが防止される。先の特許文献１に記載の構成では、連結部材９０を感光体ギヤ８２に組み付けた後、抜け止め部材を感光体ギヤにスナップフィットで固定することで、連結部材９０の感光体ギヤの抜け出しを防止している。このように、特許文献１に記載の構成では、抜け止め部材が別に必要であり、部品点数の増大による装置のコストアップに繋がる。また、組み付け工数が増えることにより、製造コストアップに繋がる。   When the drive side protrusions 94a and 94b are inserted into the drive side groove 85, the drive side protrusions 94 face the retaining portions 85a, and the connecting member 90 gets out of the photosensitive gear 82 as described above. Is prevented. In the configuration described in Patent Document 1, the connecting member 90 is assembled to the photoconductor gear 82, and then the stopper member is fixed to the photoconductor gear by snap-fit so that the photoconductor gear of the connecting member 90 is pulled out. It is preventing. As described above, the configuration described in Patent Document 1 requires a separate retaining member, which leads to an increase in the cost of the apparatus due to an increase in the number of parts. Further, the increase in the number of assembling steps leads to an increase in manufacturing cost.

一方、本実施形態では、感光体ギヤに抜け止め部８５ａを設けたので、部品点数を削減することができ、装置のコストダウンを図ることができる。また、組み立て工数の削減を図ることができ、製造コストダウンを図ることができる。   On the other hand, in the present embodiment, since the retaining portion 85a is provided on the photoconductor gear, the number of parts can be reduced and the cost of the apparatus can be reduced. In addition, the number of assembling steps can be reduced, and the manufacturing cost can be reduced.

図１３は、軸受け１００の斜視図である。
図１３に示すように、軸受け１００には、外周面が奥側側板１ｂの穴部に嵌合し、内周面が感光体ギヤの駆動側筒状部を回転自在に受ける筒状の受け部１０１と、規制突起部１０２とを有している。 FIG. 13 is a perspective view of the bearing 100. FIG.
As shown in FIG. 13, the bearing 100 has a cylindrical receiving portion whose outer peripheral surface is fitted into a hole in the back side plate 1b and whose inner peripheral surface rotatably receives the driving side cylindrical portion of the photoconductor gear. 101 and a restricting protrusion 102.

先の図３に示すように、奥側側板１ｂの穴部に嵌合固定された軸受け１００の規制突起部１０２が、挿入穴部８３に挿入されるように、感光体ギヤ８２の駆動側筒状部８２ａを軸受け１００の受け部１０１に挿入する。これにより、感光体ギヤ８２が軸受け１００を介して回転自在に奥側側板１ｂに支持される。   As shown in FIG. 3 above, the drive side cylinder of the photosensitive gear 82 is inserted so that the restriction projection 102 of the bearing 100 fitted and fixed in the hole of the back side plate 1b is inserted into the insertion hole 83. The portion 82 a is inserted into the receiving portion 101 of the bearing 100. Thus, the photosensitive gear 82 is rotatably supported by the back side plate 1 b via the bearing 100.

図１４は、軸受け１００の規制突起部１０２による規制について説明する図である。
図１４に示すように連結部材９０を、感光体ギヤ８２の駆動側筒状部８２ａに押し込んでいくと、駆動側突起部９４ａ,９４ｂが連通部８４に到達する前に、連結部材９０のバネ受９６が、規制突起部１０２に突き当たる。これにより、駆動側溝部８５内の駆動側突起部９４ａ,９４ｂが連通部８４まで移動する前に、連結部材９０の軸方向の移動が規制される。その結果、連結部材９０を感光体ギヤ８２に対して相対的に回転させても、駆動側溝部８５内の駆動側突起部９４ａ,９４ｂが連通部８４を通って、案内溝部へ移動することがない。これにより、感光体ギヤ８２を軸受け１００を介して奥側側板に支持した後は、連結部材９０が感光体ギヤ８２から抜け出すことがない。 FIG. 14 is a view for explaining the regulation by the regulation projection portion 102 of the bearing 100.
As shown in FIG. 14, when the connecting member 90 is pushed into the driving side cylindrical portion 82 a of the photoconductor gear 82, the spring of the connecting member 90 is moved before the driving side protrusions 94 a and 94 b reach the communicating portion 84. The catch 96 abuts on the control protrusion 102. Thus, axial movement of the connecting member 90 is restricted before the drive side projections 94 a and 94 b in the drive side groove 85 move to the communication part 84. As a result, even if the connecting member 90 is rotated relative to the photosensitive gear 82, the drive side protrusions 94a and 94b in the drive side groove 85 move to the guide groove through the communication part 84. Absent. As a result, after the photosensitive gear 82 is supported by the back side plate via the bearing 100, the connecting member 90 does not come out of the photosensitive gear 82.

図１５は、カップリング部材４１の斜視図であり、図１６は、カップリング部材４１の断面斜視図である。
カップリング部材４１は、軸挿入部４１ａ、従動側筒状部４１ｂを備えている。カップリング部材４１としては、機械的強度に優れ、耐摩耗性、摺動性がよいポリアセタール樹脂（ＰＯＭ）で形成するのが好適である。 FIG. 15 is a perspective view of the coupling member 41, and FIG. 16 is a cross-sectional perspective view of the coupling member 41.
The coupling member 41 includes a shaft insertion portion 41a and a driven side cylindrical portion 41b. The coupling member 41 is preferably made of polyacetal resin (POM) which is excellent in mechanical strength, abrasion resistance, and slidability.

カップリング部材４１の従動側筒状部４１ｂは、駆動側のみ開口した形状であり、連結部材９０の従動側球状部９２が挿入される従動側穴部１４３を有している。また、従動側筒状部４１ｂには、連結部材９０の従動側突起部９５ａが挿入される従動側溝部１４２が回転方向に１８０°の間隔を開けて２つ設けられている。従動側溝部１４２の溝深さｄ１は、従動側突起部９５ａの高さｈ１よりも若干、長くなっている。また、従動側球状部９２の底面には、回転中心に対してずれた位置に位相合わせ凸部１４４が形成されている。   The driven side tubular portion 41b of the coupling member 41 has an opening shape only on the drive side, and has a driven side hole portion 143 into which the driven side spherical portion 92 of the connecting member 90 is inserted. Further, the driven side tubular portion 41b is provided with two driven side groove portions 142 into which the driven side protrusion portions 95a of the connecting member 90 are inserted with an interval of 180 ° in the rotation direction. The groove depth d1 of the driven groove 142 is slightly longer than the height h1 of the driven projection 95a. Further, on the bottom surface of the driven side spherical portion 92, a phasing convex portion 144 is formed at a position shifted with respect to the rotation center.

位相合わせ凸部１４４は、図１６に示すように、中央部から外側へ向うに連れて徐々に高さが低くなるような山型形状をしている。また、位相合わせ凸部１４４は、図１５に示すように、従動側溝部１４２の位置よりも長さｅｍｍ後退した位置まで形成されている。   As shown in FIG. 16, the phase matching convex portion 144 has a mountain shape that gradually decreases in height from the center toward the outside. Further, as shown in FIG. 15, the phase matching convex portion 144 is formed to a position that is retreated by a length emm from the position of the driven side groove portion 142.

図１７は、カップリング部材４１の従動側筒状部４１ｂに連結部材９０の従動側球状部９２を挿入した状態を示す断面斜視図である。
位相合わせ凸部１４４が、図中下側に位置する状態で、カップリング部材４１と連結部材９０とを連結しようとすると、従動側球状部９２の第三従動側大円部９２ｃが位相合わせ凸部１４４に突き当たる。その結果、従動側球状部９２が、カップリング部材４１の従動側筒状部４１ｂに挿入できず、従動側突起部９５ａが従動側溝部１４２に挿入されず、駆動連結できない。すなわち、位相合わせ凸部１４４が、従動側球状部９２の第三従動側大円部９２ｃが切りかかれた部分と回転方向の位相が合っているときに、従動側球状部９２が従動側筒状部４１ｂに挿入され、従動側突起部９５ａが従動側溝部１４２に挿入され、駆動連結が行われる。すなわち、本実施形態では、位相合わせ凸部１４４と、従動側球状部９２の第三従動側大円部９２ｃが切りかかれた切り欠き部分とで、第二位相合わせ部を構成している。 FIG. 17 is a cross-sectional perspective view showing a state in which the driven-side spherical portion 92 of the connecting member 90 is inserted into the driven-side cylindrical portion 41 b of the coupling member 41.
When the coupling member 41 and the connecting member 90 are to be connected in a state where the phase alignment convex portion 144 is positioned on the lower side in the figure, the third driven side great circle portion 92c of the driven side spherical portion 92 is phase-adjusted. It hits part 144. As a result, the driven-side spherical portion 92 can not be inserted into the driven-side cylindrical portion 41b of the coupling member 41, and the driven-side projection 95a is not inserted into the driven-side groove portion 142. That is, when the phase matching convex portion 144 is in phase with the portion of the driven side spherical portion 92 cut by the third driven side large circular portion 92 c, the driven side spherical portion 92 has the following cylindrical shape. The driven side projection 95a is inserted into the driven side groove 142, and the drive connection is performed. That is, in the present embodiment, the second phasing portion is configured by the phasing convex portion 144 and the notch portion where the third driven large circle portion 92c of the driven spherical portion 92 is cut.

このように、本実施形態では、感光体ギヤ８２と連結部材９０とが規定の位相で取り付けられ、連結部材９０とカップリング部材４１とが規定の位相で駆動連結される結果、感光体ギヤ８２とカップリング部材４１とを規定の位相で駆動連結することができる。   As described above, in the present embodiment, the photoconductor gear 82 and the connecting member 90 are attached with a specified phase, and the connecting member 90 and the coupling member 41 are driven and connected with a specified phase. And the coupling member 41 can be drivably connected at a prescribed phase.

感光体ギヤ８２は、上述したように、樹脂成型品であり、ヒケなどの関係上、どうしても真円とはならず、わずかながら楕円形状となってしまう。その結果、感光体ギヤは、１回転周期の速度変動が生じてしまう。各色でこの感光体ギヤの速度変動の位相が異なると、その位相に応じた色ずれが生じてしまい、カラー画像に影響が及んでしまう。具体的に説明すると、感光体ギヤに速度変動があると、この速度変動に応じて、感光体ドラム４０も速度変動してしてしまい、この速度変動に応じて画像が伸び縮みする。すなわち、感光体ドラム４０の速度が速いときに、書き込みや転写が行われた画像は伸び、感光体ドラム４０の速度が遅いときに、書き込みや転写が行われた画像は縮むのである。各色の画像の伸びている部分同士、縮んでいる部分同士が重ね合わせられるように、各色の感光体ギヤの速度変動の位相を合わせることで色ずれを抑制できる。各色の感光体ギヤの位相合わせは、例えば、感光体ギヤの最大径となる箇所に印を付け、その印を目印にして各色の感光体ギヤを奥側側板に取り付けることで行われている。   As described above, the photosensitive gear 82 is a resin molded product, and due to sinks and the like, the photosensitive gear 82 is not perfectly circular but slightly elliptical. As a result, the photosensitive gear has a speed fluctuation of one rotation cycle. If the phase of the speed fluctuation of the photoconductor gear is different for each color, a color shift corresponding to the phase occurs, and the color image is affected. More specifically, if there is a speed fluctuation in the photoconductor gear, the speed of the photoconductor drum 40 also fluctuates according to the speed fluctuation, and the image expands and contracts according to the speed fluctuation. That is, when the speed of the photosensitive drum 40 is high, an image on which writing or transfer has been performed expands, and when the speed of the photosensitive drum 40 is low, an image on which writing or transfer has been performed contracts. Color misregistration can be suppressed by matching the phase of speed fluctuations of the photoconductor gears of the respective colors so that the extended portions and the contracted portions of the images of the respective colors are superimposed. The phasing of the photoreceptor gears of the respective colors is performed, for example, by marking the location where the maximum diameter of the photoreceptor gear is to be made and attaching the photoreceptor gears of the respective colors to the back side plate with the indicia as marks.

また、カップリング部材が取り付けられる感光体ドラム４０においても、感光体ドラム４０の偏心などにより一回転周期の速度変動が生じる。そのため、感光体ドラム４０についても各色の感光体ドラム４０の速度変動の位相を合わせて、感光体ドラム４０を装置本体に組み付ける必要がある。
本実施形態においては、従動側突起部９５ａは、回転方向に１８０°の間隔を開けて設けられている。そのため、従動側突起部９５ａと従動側溝部１４２との回転方向の位相が合っている状態から、カップリング部材を１８０°回転させても、従動側突起部９５ａと従動側溝部１４２との回転方向の位相が合う。その結果、感光体ドラム４０は、規定の位相に対して１８０°位相がずれた状態で、装置本体に組みつけられるおそれがあり、色ずれが生じるおそれがある。 Also in the photosensitive drum 40 to which the coupling member is attached, the speed fluctuation of one rotation cycle occurs due to the eccentricity of the photosensitive drum 40 or the like. For this reason, it is necessary to assemble the photosensitive drum 40 to the apparatus main body by matching the phase of the speed fluctuation of the photosensitive drum 40 of each color.
In the present embodiment, the driven-side protrusions 95a are provided with an interval of 180 ° in the rotation direction. Therefore, even if the coupling member is rotated 180 ° from the phase in which the driven protrusion 95a and the driven groove 142 are in phase, the rotation direction of the driven protrusion 95a and the driven groove 142 Are in phase. As a result, the photosensitive drum 40 may be assembled to the apparatus main body in a state where the phase is 180 degrees out of phase with the prescribed phase, and there is a possibility that color misregistration may occur.

これに対し、本実施形態では、位相合わせ凸部１４４を有しているため、従動側突起部９５ａと従動側溝部１４２との回転方向の位相が合っていても、第三従動側大円部９２ｃが位相合わせ凸部１４４に対向しているときは、駆動連結されない。その状態からカップリング部材４１を連結部材９０に対して１８０°相対的に回転させて、始めて、従動側球状部が、従動側筒状部に挿入され、駆動連結が行われる。これにより、感光体ドラム４０を規定の位相で装置本体に組みつけることができ、色ずれを抑制することができる。   On the other hand, in the present embodiment, since the phase matching convex portion 144 is provided, the third driven large circle portion is obtained even if the phases in the rotational direction of the driven protrusion portion 95a and the driven groove portion 142 match. When 92 c is opposed to the phase matching convex portion 144, it is not driven and connected. From this state, the coupling member 41 is rotated relative to the coupling member 90 by 180 °, and the driven spherical portion is first inserted into the driven cylindrical portion to perform drive coupling. As a result, the photosensitive drum 40 can be assembled to the apparatus main body with a prescribed phase, and color shift can be suppressed.

また、駆動側突起部９４ａ,９４ｂも回転方向に１８０°の間隔を開けて設けられている。そのため、各駆動側突起部の高さおよび案内溝部の溝深さを同等とした場合、駆動側突起部と案内溝部との回転方向の位相が合っている状態から、連結部材を１８０°感光体ギヤに対して回転させても、従動側突起部９５ａと従動側溝部１４２との回転方向の位相が合う。そのため、カップリング部材を規定の位相で連結部材に連結し、各感光体ドラム４０の速度変動位相を合わせたとしても、感光体ギヤの速度変動の位相が、規定の位相に対して１８０°ずれてしまうおそれがある。しかし、本実施形態においては、各駆動側突起部の高さを異ならせて、第一駆動側突起部を、第二案内溝部には、挿入できないようにしている。これにより、感光体ギヤの回転速度位相が、他の感光体ギヤの速度変動に対して、１８０°位相がずれてしまうのを防止することができ、色ずれを抑制することができる。   Further, the drive side protrusions 94a and 94b are also provided at an interval of 180 ° in the rotational direction. Therefore, when the heights of the drive side protrusions and the groove depths of the guide grooves are made equal, the connecting member is rotated 180 ° from the state where the rotational direction of the drive side protrusions and the guide grooves are in phase. Even if it rotates with respect to a gear, the phase of the rotation direction of the driven-side protrusion 95a and the driven-side groove 142 matches. Therefore, even if the coupling member is connected to the connecting member at a prescribed phase and the speed fluctuation phase of each photosensitive drum 40 is matched, the phase of the photosensitive gear speed fluctuation deviates by 180 ° with respect to the prescribed phase. There is a risk of However, in the present embodiment, the heights of the drive side protrusions are made different so that the first drive side protrusions can not be inserted into the second guide groove. As a result, it is possible to prevent the rotational speed phase of the photosensitive gear from being 180 ° out of phase with respect to the speed fluctuation of the other photosensitive gears, and to suppress the color shift.

感光体ドラムを備えたユニットを装置に装着する際、ドラム軸４０ａに取り付けられたカップリング部材４１と連結部材９０との位相が合っていないときは、カップリング部材の従動側筒状部の縁部に従動側突起部９５ａが突き当たったり、第三従動側大円部９２ｃが位相合わせ凸部１４４に突き当たったりする。その状態でさらに、感光体ドラムを備えたユニットを装置本体に押し入れていくと、連結部材９０がコイルスプリング７３を圧縮しながら、奥側へ移動する。これにより、カップリング部材４１と連結部材９０との駆動連結が行われなくても、感光体ドラムを備えたユニットを装置本体に装着することができる。   When the unit including the photosensitive drum is mounted on the apparatus, if the coupling member 41 attached to the drum shaft 40a and the connecting member 90 are out of phase, the edge of the driven cylindrical portion of the coupling member The driven-side protrusion 95a hits the part, or the third driven-side great circle part 92c hits the phase matching convex part 144. In this state, when the unit including the photosensitive drum is further pushed into the apparatus main body, the connecting member 90 moves to the back side while compressing the coil spring 73. As a result, even if the driving connection between the coupling member 41 and the connecting member 90 is not performed, the unit including the photosensitive drum can be mounted on the apparatus main body.

連結部材９０が感光体ギヤ８２とともに回転駆動すると、従動側突起部９５ａと従動側溝部１４２との位相が合い、第三従動側大円部９２ｃと位相合わせ凸部１４４との当接が外れて、連結部材９０とカップリング部材４１との位相が合う。すると、連結部材９０がコイルスプリング７３の付勢力によりカップリング部材側へ移動し、従動側球状部９２が、従動側穴部１４３に入り込み、従動側突起部９５ａが従動側溝部１４２に入り込む。これにより、連結部材９０とカップリング部材４１とが規定の位相で駆動連結され、連結部材９０からカップリング部材４１へ駆動力が伝達される。   When the connecting member 90 is rotationally driven together with the photoconductor gear 82, the phase of the driven-side projection 95a and the driven-side groove 142 is matched, and the contact between the third driven-side great circle 92c and the phase-adjusting convex 144 is released. And the coupling member 90 and the coupling member 41 are in phase with each other. Then, the connecting member 90 moves to the coupling member side by the urging force of the coil spring 73, the driven side spherical portion 92 enters the driven side hole portion 143, and the driven side projection portion 95 a enters the driven side groove portion 142. As a result, the connecting member 90 and the coupling member 41 are drivingly connected with a specified phase, and the driving force is transmitted from the connecting member 90 to the coupling member 41.

感光体ギヤの回転中心と、ドラム軸４０ａの回転中心とにずれ（以下、軸心ずれという）があるときは、図３に示すように、連結部材９０が傾くことで駆動連結することができる。本実施形態では、連結部材の感光体ギヤ８２の駆動側筒状部８２ａに挿入される第一挿入部、カップリング部材の従動側筒状部に挿入される第二挿入部を、球状としている。これにより、軸心ずれがあった場合、連結部材をスムーズに傾けさせることができ、良好に軸心ずれを吸収できる。具体的には、感光体ギヤ８２の駆動側筒状部８２ａに挿入される駆動側球状部の第一,第二,第三駆動側大円部９１ａ，９１ｂ，９１ｃの円弧状の表面が駆動側穴部８７の内周面をスムーズに摺動し、感光体ギヤ８２に対してスムーズに連結部材９０が傾く。また、カップリング部材の従動側筒状部に挿入される従動側球状部の第一，第二，第三従動側大円部９２ａ，９２ｂ，９２ｃの円弧状の表面が、従動側穴部１４３の内周面や従動側筒状部の底面をスムーズに摺動し、カップリング部材に対してスムーズに連結部材９０が傾く。これにより、連結部材９０がスムーズに傾き、軸心すれを抑制することができる。   When there is a deviation (hereinafter referred to as an axial misalignment) between the rotation center of the photoconductor gear and the rotation center of the drum shaft 40a, the connecting member 90 can be driven and connected as shown in FIG. . In this embodiment, the first insertion portion inserted into the drive side cylindrical portion 82a of the photosensitive member gear 82 of the connection member and the second insertion portion inserted into the driven side cylindrical portion of the coupling member are spherical. . Thereby, when there is a misalignment, the connecting member can be inclined smoothly, and the misalignment can be absorbed well. Specifically, the arc-shaped surfaces of the first, second and third drive side large circular portions 91a, 91b and 91c of the drive side spherical portion inserted into the drive side cylindrical portion 82a of the photosensitive gear 82 drive The inner peripheral surface of the side hole 87 is smoothly slid, and the connecting member 90 is inclined smoothly with respect to the photoconductor gear 82. Further, the arc-shaped surfaces of the first, second and third driven side large circular portions 92a, 92b and 92c of the driven side spherical portion inserted into the driven side cylindrical portion of the coupling member are the driven side hole portion 143. The connecting member 90 is smoothly inclined with respect to the coupling member. Thereby, the connection member 90 can be smoothly inclined, and axial displacement can be suppressed.

図１８は、カップリング部材４１と連結部材９０とを従動側突起部９５ａの突出方向と直交する方向に切った断面図である。
図１８（ａ）に示すように、位相合わせ凸部１４４の高さが、連結部材９０が傾いていないときは、第一従動側大円部９２ａの側面に対して所定の隙間を有するような高さとなっている。この隙間は、図１８（ｂ）に示すように、連結部材９０の従動側突起部９５ａの突出方向と直交する方向の最大傾斜角度＋θ１傾いても、第一従動側大円部９２ａが、位相合わせ凸部１４４に接触しない隙間となっている。 FIG. 18 is a cross-sectional view in which the coupling member 41 and the connecting member 90 are cut in a direction perpendicular to the protruding direction of the driven-side protruding portion 95a.
As shown in FIG. 18A, the height of the phasing convex portion 144 is such that when the connecting member 90 is not inclined, there is a predetermined gap with respect to the side surface of the first driven side large circle portion 92a. It is height. As shown in FIG. 18B, even if this gap is inclined at the maximum inclination angle + θ1 in the direction orthogonal to the projecting direction of the driven projection 95a of the connecting member 90, the first driven large circle 92a is in phase. It is a gap not in contact with the fitting convex portion 144.

また、先の図１５に示すように、位相合わせ凸部１４４は、従動側溝部１４２の側面と面一となる箇所まで形成せず、従動側溝部１４２の側面に対してｅｍｍ後退している。そのため、図１８（ａ）に示すように、連結部材９０が傾いていないとき、位相合わせ凸部１４４の側面と第二従動側大円部９２ｂの側面との間に所定の隙間が形成される。この隙間は、図１８（ｃ）に示すように、連結部材９０の従動側突起部９５ａの突出方向と直交する方向の最大傾斜角度−θ１傾いても、第二従動側大円部９２ｂが、位相合わせ突起部の側面に接触しない隙間となっている。   Further, as shown in FIG. 15, the phase alignment convex portion 144 is not formed up to a location that is flush with the side surface of the driven side groove portion 142, and is retreated by emm with respect to the side surface of the driven side groove portion 142. Therefore, as shown in FIG. 18A, when the connecting member 90 is not inclined, a predetermined gap is formed between the side surface of the phase matching convex portion 144 and the side surface of the second driven side large circle portion 92b. . As shown in FIG. 18C, even if this gap is inclined at the maximum inclination angle -θ1 in the direction orthogonal to the projecting direction of the driven projection 95a of the connecting member 90, the second driven large circle 92b is The gap is not in contact with the side surface of the phase matching projection.

図１９は、カップリング部材４１と連結部材９０とを従動側突起部９５ａの突出方向と平行に切った断面図である。
位相合わせ凸部１４４は、図１９（ａ）に示すように、断面が中央から端部に向かうにつれて高さが低くなるような山型形状をしている。そして、位相合わせ凸部１４４の傾斜面の傾斜角度θ３を、図１９（ｂ）や、図１９（ｃ）に示すように、連結部材９０が、従動側突起部９５ａの突出方向と平行な方向に最大傾斜角度θ２で傾いたときに、第一従動側大円部９２ａの側面が位相合わせ凸部１４４に当接しないような角度に設定さている。 FIG. 19 is a cross-sectional view in which the coupling member 41 and the connecting member 90 are cut in parallel to the protruding direction of the driven-side protruding portion 95a.
As shown in FIG. 19A, the phasing convex portion 144 has a mountain-like shape in which the cross-section decreases in height from the center toward the end. Then, as shown in FIG. 19 (b) and FIG. 19 (c), the inclination angle θ3 of the inclined surface of the phasing convex portion 144 is a direction in which the connecting member 90 is parallel to the projecting direction of the driven projection 95a. Is set such that the side surface of the first driven side large circle portion 92a does not abut on the phase matching convex portion 144 when it is inclined at the maximum inclination angle .theta.2.

このように、本実施形態においては、位相合わせ凸部１４４が、連結部材９０の傾きを阻害しないので、連結部材９０で軸心ずれを良好に吸収することができる。なお、連結部材９０の最大傾斜角度は、連結部材９０の連結部９３が、カップリング部材４１の従動側筒状部の縁部に突き当たったり、感光体ギヤの駆動側筒状部の縁部に突き当たったりすることにより、傾斜が規制されるときの角度である。   Thus, in this embodiment, since the phase alignment convex part 144 does not inhibit the inclination of the connecting member 90, the connecting member 90 can absorb the axial misalignment satisfactorily. The maximum inclination angle of the connecting member 90 is determined such that the connecting portion 93 of the connecting member 90 abuts against the edge of the driven cylindrical portion of the coupling member 41 or the edge of the driving cylindrical portion of the photosensitive gear. It is the angle at which the inclination is restricted by hitting.

また、従動側（カップリング部材４１と連結部材９０と）の位相を合わせる構成を、駆動側（感光体ギヤと連結部材と）の位相を合わせの構成と同じとしてもよい。すなわち、従動側突起部９４ｂの長さを互いに異ならせ、従動側溝部１４２の溝深さを互いに異ならせて、従動側突起部９４ｂを決められた従動側溝部１４２以外に挿入できなくようにする構成である。   Further, the configuration for matching the phase of the driven side (the coupling member 41 and the connecting member 90) may be the same as the configuration for matching the phase of the driving side (the photosensitive gear and the connecting member). That is, the lengths of the driven side protrusions 94b are made different from each other, and the groove depths of the driven side groove parts 142 are made different from each other so that the driven side protrusions 94b cannot be inserted into other than the determined driven side groove parts 142. It is a configuration.

また、本実施形態においては、連結部材９０の感光体ギヤから駆動力が伝達される駆動側突起部９４ａ,９４ｂ、カップリング部材に駆動力を伝達する従動側突起部９５ａの形状を円柱状としている。これにより、駆動側突起部および従動側突起部を半球状とした従来構成に比べて、角速度変動を抑制することができるという利点を得ることができる。以下に、図面を用いて具体的に説明する。   Further, in the present embodiment, the drive side protrusions 94a and 94b to which the driving force is transmitted from the photosensitive member gear of the connecting member 90 and the driven side projections 95a to transmit the driving force to the coupling member are cylindrical. There is. Thereby, the advantage that an angular velocity fluctuation | variation can be suppressed compared with the conventional structure which made the drive side protrusion part and the driven side protrusion part hemispherical can be acquired. Below, it demonstrates concretely using drawing.

図２０は、従来の連結部材とカップリング部材との駆動伝達について説明する図であり、（ａ）は、連結部材の傾き方向に対して直交する方向見た概略図であり、（ｂ）は、図２０（ａ）の上から見た概略図であり、（ｃ）は、軸方向見た概略図である。また、図２１は、図２０の状態から９０°回転させた状態を示す図であり、（ａ）は、連結部材の傾き方向に対して直交する方向見た概略図であり、（ｂ）は、図２１（ａ）の上から見た概略図であり、（ｃ）は、軸方向見た概略図である。   FIG. 20 is a view for explaining the drive transmission between the conventional connection member and the coupling member, and (a) is a schematic view seen in a direction orthogonal to the inclination direction of the connection member, (b) Fig. 20 (a) is a schematic view seen from the top, and Fig. 20 (c) is a schematic view seen in the axial direction. FIG. 21 is a view showing a state rotated 90 ° from the state of FIG. 20, where (a) is a schematic view seen in a direction orthogonal to the inclination direction of the connecting member, (b) Fig. 21 (a) is a schematic view from above, and (c) is a schematic view from the axial direction.

従動側突起部１９５が半球状の場合、図２０（ｃ）に示すように、従動側溝部１４２の側面に当接する溝部当接箇所である従動側突起部１９５の回転方向下流端が、頂部に向うにつれて、回転方向上流側に位置するような円弧形状となる。図２０に示すように従動側突起部１９５の突出方向が、軸心ずれ方向に対して直交する方向のときは、従動側突起部１９５のほぼ全体が従動溝部に入り込んでいる。そのため、このときは、図２０（ｃ）に示すように、従動側突起部１９５の従動側球状部側が、従動側溝部１４２の側面に当接している。   When the driven-side projection 195 is hemispherical, as shown in FIG. 20C, the downstream end of the driven-side projection 195 in the rotational direction, which is a groove-contacting portion that is in contact with the side surface of the driven groove 142 As it goes, it becomes an arc shape that is located on the upstream side in the rotational direction. As shown in FIG. 20, when the protrusion direction of the driven protrusion 195 is in the direction orthogonal to the off-axis direction, substantially the entire of the driven protrusion 195 is in the driven groove. Therefore, at this time, as shown in FIG. 20C, the driven-side spherical portion side of the driven-side projection portion 195 is in contact with the side surface of the driven-side groove portion 142.

この状態から図２０（ｃ）の矢印Ｆ方向に回動すると、図２０（ｃ）の左側の従動側突起部１９５が感光体ギヤから離間する方向に従動溝部内を軸方向に移動し、図２０（ｃ）の右側の従動側突起部１９５が感光体ギヤに近づく方向に従動溝部内を軸方向に移動する。このとき、従動側突起部１９５の従動溝部への入り込み量が減少し、従動側突起部１９５の従動溝部側面との当接位置が頂部側へと変化していく。従動側突起部１９５が半球状の場合は、上述したように、従動側溝部１４２と当接する従動側突起部１９５の回転方向下流端は、頂部に向うにつれて、回転方向上流側に位置する。このため、図２１（ｃ）に示すように、連結部材１９０が９０°回転しても、カップリング部材４１は９０°回転しておらず、回転方向でδθ後退した位置に位置し、カップリング部材４１の角速度が連結部材９０の角速度よりも遅くなる。   When this state is rotated in the direction of arrow F in FIG. 20 (c), the driven projection 195 on the left side in FIG. 20 (c) axially moves in the driven groove in the direction of separating from the photosensitive gear. The right driven projection 195 of 20 (c) moves in the axial direction in the driven groove in a direction approaching the photosensitive member gear. At this time, the amount of the driven-side protrusion 195 entering the driven groove decreases, and the contact position of the driven-side protrusion 195 with the side surface of the driven groove changes toward the top. When the driven side protrusion 195 is hemispherical, as described above, the downstream end in the rotational direction of the driven side protrusion 195 that contacts the driven side groove 142 is positioned upstream in the rotational direction toward the top. For this reason, as shown in FIG. 21 (c), even if the connecting member 190 rotates 90 °, the coupling member 41 does not rotate 90 ° and is positioned at a position that is receded by δθ in the rotation direction. The angular velocity of the member 41 is slower than the angular velocity of the connecting member 90.

そして、図２１の状態からさらに、図２１（ｃ）の矢印Ｆ方向に回転すると、図２１（ａ）において上側に位置する従動側突起部１９５が、感光体ギヤに近づくように従動溝部内を軸方向に移動する。また、図２１（ａ）において下側に位置する従動側突起部１９５が、感光体ギヤから遠ざかるように従動溝部内を軸方向に移動する。このとき、従動側突起部１９５の従動溝部側面との当接位置が頂部側から従動側球状部側へと変化し、図２１の状態から９０°回転し、トータルで１８０°回転すると、従動側突起部１９５と従動溝部との位置が入れ替わる以外は、図２０と同じ状態となる。このとき、カップリング部材４１の遅れがなくなっており、連結部材９０と同様、１８０°回転している。すなわち、図２１の状態から９０°回転する間は、カップリング部材は、δθ多く回転しており、連結部材９０に対して角速度が速まるのである。このように、従動側突起部を半球状とした場合は、１／２回転周期の角速度変動が生じてしまう。
上述では、連結部材とカップリング部材との間の速度変動について説明したが、駆動側突起部が、半球状の場合は、感光体ギヤと連結部材との間において、連結部材が、１／２周期で速度変動が生じてしまう。 Then, when it is further rotated in the direction of arrow F in FIG. 21 (c) from the state of FIG. 21, the driven-side projection 195 positioned on the upper side in FIG. 21 (a) Move in the axial direction. Further, in FIG. 21A, the driven-side projection 195 positioned on the lower side axially moves in the driven groove so as to move away from the photosensitive gear. At this time, the contact position of the driven-side protrusion 195 with the side surface of the driven groove changes from the top to the driven-side spherical part, and rotates 90 ° from the state of FIG. The state is the same as that of FIG. 20 except that the positions of the protrusion 195 and the driven groove are switched. At this time, the delay of the coupling member 41 is eliminated and, like the connecting member 90, it is rotated by 180 °. That is, while rotating by 90 ° from the state of FIG. 21, the coupling member is rotated by Δθ many times, and the angular velocity is accelerated with respect to the connecting member 90. As described above, when the driven-side protrusion is hemispherical, angular velocity fluctuations with a half rotation period occur.
In the above description, the speed fluctuation between the connecting member and the coupling member has been described. However, when the drive side protrusion is hemispherical, the connecting member is 1⁄2 between the photosensitive gear and the connecting member. Speed fluctuation occurs in the cycle.

図２２は、本実施形態の連結部材９０とカップリング部材４１との駆動伝達について説明する図であり、（ａ）は、連結部材９０の傾き方向に対して直交する方向見た概略図であり、（ｂ）は、図２２（ａ）の上から見た概略図であり、（ｃ）は、軸方向見た概略図である。また、図２３は、図２２の状態から９０°回転させた状態を示す図であり、（ａ）は、連結部材の傾き方向に対して直交する方向見た概略図であり、（ｂ）は、図２３（ａ）の上から見た概略図であり、（ｃ）は、軸方向見た概略図である。   FIG. 22 is a diagram for explaining the drive transmission between the coupling member 90 and the coupling member 41 in the present embodiment, and (a) is a schematic view seen in the direction orthogonal to the inclination direction of the coupling member 90. (B) is the schematic seen from the top of Drawing 22 (a), (c) is the schematic seen from the direction of an axis. Moreover, FIG. 23 is a figure which shows the state rotated 90 degrees from the state of FIG. 22, (a) is the schematic seen from the direction orthogonal to the inclination direction of a connection member, (b) Fig. 23 (a) is a schematic view from above, and (c) is a schematic view from the axial direction.

本実施形態においては、従動側突起部９５ａを円柱状としている。これにより、図２２（ｃ）に示すように、従動側突起部９５ａの従動溝部の側面に当接する溝部当接箇所である回転方向下流側端部が、径方向に真直ぐ延びる直線形状となり、従動側突起部９５ａの従動溝部４２に当接する箇所が、従動側球状部９２側から頂部まで、回転方向において同じ位置となる。図２２に示す状態から、図２２（ｃ）の矢印Ｆ方向に回転すると、従動側突起部９５ａの従動溝部の入り込みが減少し、図２３（ｃ）に示すように、９０°回転すると、従動側突起部９５ａの頂部側のみ従動溝部１４２に入り込んだ状態となる。その結果、従動側突起部の頂部の回転方向下流側端部のみ従動側溝部の側面に当接する状態となる。しかし、従動側突起部の回転方向下流側端部が径方向に真直ぐ延びる直線状であるので、従動側突起部の頂部の回転方向下流側端部のみ従動側溝部の側面に当接する状態となっても、カップリング部材４１は、連結部材９０の回転に対して遅れることなく、連結部材と同じ角度回転する。これにより、軸心ずれがあっても、カップリング部材４１を等速度で回転させることができる。   In the present embodiment, the driven-side projection 95a has a cylindrical shape. As a result, as shown in FIG. 22C, the downstream end in the rotational direction, which is the groove contact portion contacting the side surface of the driven groove of the driven projection 95a, has a linear shape extending straight in the radial direction. The locations of the side protrusions 95a that are in contact with the driven groove 42 are the same in the rotational direction from the driven spherical portion 92 to the top. When it is rotated in the direction of arrow F in FIG. 22 (c) from the state shown in FIG. 22, the entry of the follower groove of the follower-side projection 95a is reduced, and as shown in FIG. Only the top side of the side projection 95 a is in the state of being inserted into the driven groove 142. As a result, only the downstream end portion in the rotation direction of the top portion of the driven-side projection portion comes into contact with the side surface of the driven-side groove portion. However, since the downstream end of the driven projection in the rotational direction has a straight shape extending straight in the radial direction, only the downstream end of the top of the driven projection in the rotational direction abuts on the side surface of the driven groove. However, the coupling member 41 rotates at the same angle as the connecting member 90 without delaying the rotation of the connecting member 90. As a result, the coupling member 41 can be rotated at an equal speed even if there is axial misalignment.

同様に、駆動側突起部９４ａ，９４ｂも円柱形状としているので、感光体ギヤから連結部材への駆動伝達において、連結部材９０が速度変動することなく、連結部材を等速度で回転させることができる。   Similarly, since the drive side protrusions 94a and 94b also have a cylindrical shape, the connecting member 90 can be rotated at the same speed without the speed of the connecting member 90 fluctuating in the drive transmission from the photosensitive gear to the connecting member. .

また、本実施形態では、駆動側突起部９４ａ,９４ｂ、従動側突起部９５ａを円柱形状とすることで、溝部の側面に当接する溝部当接箇所である回転方向下流側端部が、回転方向に突出するような円弧面となる。その結果、突起部と溝部の側面との当接が、径方向から見たとき、点接触となり、図２２（ａ）に示すように、突起部の突出方向と直交する方向にスムーズに連結部材９０を傾けることができる。なお、上記点接触とは、設計上の理想な状態であり、実際においては、多少接触幅を有する状態を含む。   Further, in the present embodiment, by making the drive side protrusions 94a and 94b and the driven side protrusions 95a into a cylindrical shape, the downstream end portion in the rotational direction, which is the groove abutting portion abutting on the side surface of the groove, The arc surface protrudes to As a result, the contact between the protruding portion and the side surface of the groove portion is a point contact when viewed from the radial direction, and as shown in FIG. 22A, the connecting member smoothly in the direction orthogonal to the protruding direction of the protruding portion. 90 can be tilted. The above-mentioned point contact is an ideal state in design, and includes a state in which the contact width is somewhat in practice.

図２４は、駆動側突起部および従動側突起部が半球形状の従来の連結部材を用い、ドラム軸の軸中心を感光体ギヤの回転軸に対して所定量ずらして連結させたときの感光体ドラムの速度変動を調べたグラフである。図２４に示すように、感光体ドラムが、所定の周期で速度変動が生じていることがわかる。   FIG. 24 shows a photoconductor when a conventional connecting member having a driving-side protrusion and a driven-side protrusion is hemispherical and the shaft center of the drum shaft is shifted by a predetermined amount with respect to the rotation shaft of the photoconductor gear. It is the graph which investigated the speed fluctuation of the drum. As shown in FIG. 24, it can be seen that the photosensitive drum has a speed fluctuation at a predetermined cycle.

図２５は、駆動側突起部および従動側突起部を円柱形状の本実施形態の連結部材を用い、ドラム軸の軸中心を感光体ギヤの回転軸に対して所定量ずらして連結させたときの感光体ドラムの速度変動を調べたグラフである。
図２５に示すように、図２４に示した従来構成の場合に比べて、感光体ドラムの速度変動を十分に抑制できていることがわかる。 FIG. 25 shows the case where the drive side projection and the driven side projection are connected by shifting the axial center of the drum shaft by a predetermined amount with respect to the rotation axis of the photosensitive gear using the connecting member of the present embodiment having a cylindrical shape. It is the graph which investigated the speed fluctuation of the photoconductive drum.
As shown in FIG. 25, it can be seen that the speed fluctuation of the photosensitive drum can be sufficiently suppressed as compared with the case of the conventional configuration shown in FIG.

また、駆動側突起部９４ａ，９４ｂや従動側突起部９５ａは、少なくとも溝部（１４２,８５）の側面と当接する溝部当接箇所が、径方向に真直ぐのび、回転方向に突出した形状であればよい。よって、例えば、図２６に示すような断面角丸長方形状の柱形状や、断面楕円形状の柱形状でもよい。
また、突起部（９５ａ,９４ａ,９４ｂ）の溝部（４２,８５）の側面と当接する溝部当接箇所が円弧面の場合、円弧の中心角θｙを、連結部材９０の突起部の突出方向と直交する方向の最大傾斜角度θ１の２倍以上にする。これにより、連結部材９０が最大傾斜角度θ１で傾いたときも、突起部（９５ａ、９４ａ,９４ｂ）の円弧面を、溝部（１４２,８５）の側面に当接させることができる。これにより、連結部材９０が最大傾斜角度θ１で傾いたときも、突起部の突出方向からみたときの溝部と突起部との接触を点接触にすることができスムーズに連結部材９０を傾かせることができる。 In addition, if the drive-side protrusions 94a and 94b and the driven-side protrusions 95a have a shape in which at least the groove contact portion contacting with the side surface of the groove (142, 85) is straight in the radial direction and protrudes in the rotational direction Good. Therefore, for example, a column shape having a rounded rectangular shape as shown in FIG. 26 or a column shape having an elliptical cross section may be used.
Further, when the groove contact portion in contact with the side surface of the groove (42, 85) of the projection (95a, 94a, 94b) is an arc surface, the central angle θy of the arc is the projection direction of the projection of the connecting member 90 More than twice the maximum inclination angle θ1 in the orthogonal direction. Thus, even when the connecting member 90 is inclined at the maximum inclination angle θ1, the arc surface of the projection (95a, 94a, 94b) can be made to abut on the side surface of the groove (142, 85). Thereby, even when the connecting member 90 is inclined at the maximum inclination angle θ1, the contact between the groove and the protruding portion when viewed from the protruding direction of the protruding portion can be made point contact, and the connecting member 90 can be inclined smoothly. Can do.

また、上述では、感光体へ駆動力を伝達する駆動伝達部について説明したが、これに限らず、現像ローラへの駆動伝達、定着ローラへの駆動伝達、中間転写ベルトへの駆動伝達などにも、本実施形態の駆動伝達を用いることができる。   Further, although the drive transmission unit for transmitting the driving force to the photosensitive member has been described above, the present invention is not limited to this, and the drive transmission to the developing roller, the drive transmission to the fixing roller, the drive transmission to the intermediate transfer belt, etc. The drive transmission of this embodiment can be used.

以上に説明したものは一例であり、以下の態様毎に特有の効果を奏する。
（態様１）
回転中心に穴部を有する感光体ギヤ８２などの第一回転体と、回転中心に穴部を有するカップリング部材４１などの第二回転体と、第一回転体の穴部の内周面に設けられた軸方向に延びる駆動側溝部８５などの第一溝部と、第二回転体の穴部の内周面に設けられた軸方向に延びる従動側溝部１４２などの第二溝部と、前記第一溝部に係合する径方向に突出した駆動側突起部９４ａ,９４ｂなどの第一突起部を有し、第一回転体の穴部に挿入される第一挿入部９０ａ、第二溝部に係合する径方向に突出した従動側突起部９５ａなどの突起部を有し、第二回転体の穴部に挿入される第二挿入部９０ｂ、および、第一挿入部９０ａと第二挿入部９０ｂと繋ぐ連結部９３を有し、第一回転体と第二回転体とを連結する連結部材９０とを備えた駆動伝達装置７０であって、第一挿入部９０ａが、第一回転体の穴部内を軸方向に移動可能であり、第一溝部の形成位置とは、回転方向で異なる位置で第一突起部が第一回転体の穴部に挿入可能であり、第一溝部の形成位置とは回転方向で異なる位置で穴部に挿入された第一突起部が、穴部の内部で第一溝部に位置することができ、かつ、第一溝部に位置した後、第二回転体側へ第一溝部内を第一突起部が移動できるように、第一回転体の穴部および第一溝部を構成し、第二挿入部９０ｂの最大外径を、第一回転体の穴部の内径よりも小さくした。
上述したように、開発中の駆動伝達装置において、連結部材９０を十分に短くすることができない。これは、案内溝８６ａ,８６ｂと駆動側溝部８５などの第一溝部とが連通する連通部８４を、従動側溝部１４２などの第二溝部と従動側突起部９５ａなどの第二突起部との回転方向の位相が合っておらず、カップリング部材４１などの第二回転体により連結部材９０が押し込まれたときに駆動側突起部９４ａ，９４ｂなどの第一突起部が第一溝部内を移動する移動範囲よりも穴部の内部側に設ける必要があるからである。連通部８４が、上記移動範囲内にあった場合は、次の不具合がある。すなわち、第二溝部と第二突起部との回転方向の位相が合っておらず第二回転体により連結部材９０が押し込まれ、第一突起部が第一溝部内を移動して、連通部８４にさしかかったときに、連結部材９０が何かの拍子に回転すると、第一突起部が連通部８４を通って第一溝部から案内溝８６ａ，８６ｂへ移動してしまう。すると、これ以上、連結部材９０を押し込めなくなり、第二回転体を装置内の規定の位置にさせることができなくなる。また、再度、第二回転体を組み付けをこころみるため、第二回転体を連結部材９０から一旦離すと、コイルスプリング７３の付勢力により、連結部材９０が第二回転体側へ移動する。このとき、第一突起部が案内溝内を移動して第一突起部が穴部から抜け出してしまい、連結部材９０が第一回転体の穴部から外れてしまうという不具合である。この不具合を防止するため、連通部８４を、上記移動範囲よりも穴部の内部側に設ける必要があるのである。そのため、第一突起部から第二突起部までの長さを、第一回転体穴部の第二回転体側端部から第一溝部と案内溝との連通箇所までの長さより長くなるよう連結部材９０を構成しなけらればならない。なぜなら、第一突起部から第二突起部までの長さを、第一回転体穴部の第二回転体側端部から連通部８４までの長さよりも短くすると、第一突起部を第一溝部に位置させることができなくなるからである。具体的に説明すると、第二突起部の回転方向の位置と第一突起部の回転方向の位置とが互いに異なる場合は、第一突起部が連通部８４に到達する前に、第二挿入部の第二突起部が第一回転体の穴部の第二回転体側端面に突き当り、第一突起部を案内溝８６ａ，８６ｂに位置させることができない。また、第一突起部の回転方向の位置と第二突起部の回転方向の位置が同じ場合は、第二突起部が案内溝８６ａ，８６ｂに入り込み、第一突起部は、連通部８４に到達できる。しかし、第二突起部が案内溝８６ａ，８６ｂの側面に突き当たり、連結部材９０を回転させることができず、連通部８４を通って第一突起部を案内溝に位置させることができない。
このように、開発中の駆動伝達装置においては、少なくとも、第一突起部から第二突起部までの長さが、第一回転体穴部の第二回転体側端部から第一溝部と案内溝８６ａ，８６ｂとの連通箇所までの長さよりも長くなるように、連結部材９０を構成する必要があり、連結部材９０を十分に短くすることができなかったのである。
一方、（態様１）では、第二挿入部の最大外径を、第一回転体の穴部の内径よりも小さくしているので、第二挿入部を、第一回転体の穴部に挿入することができる。これにより、第一回転体の穴部の第二回転体側端部から第一挿入部の突起部を第一溝部に位置させる箇所までの長さよりも短い連結部材であっても、連結部材を第一回転体に組み付けることができる。具体的には、第二挿入部が第一回転体の穴部に入り込むことで、第一突起部が第一溝部に位置させる箇所まで第一挿入部を、第一回転体の穴部に挿入することができる。また、第二挿入部が第一回転体の穴部に挿入された状態で、連結部材を回転させることができる。その結果、第一突起部を、第一溝部に位置させることができ、連結部材を第一回転体に組み付けることができる。
また、（態様１）では、第一挿入部が、第一回転体の穴部内を軸方向に移動可能に構成されている。これにより、第二溝部と第二突起部との回転方向の位相が合っておらず第二回転体の穴部に第二挿入部が挿入されないときは、第一挿入部が第一回転体の穴部内を移動し、第二回転体の穴部に第二挿入部が挿入されていなくても、第二回転体を装置内の所定の位置に位置させることができる。
また、第一溝部の形成位置とは、回転方向で異なる位置で、第一突起部が第一回転体の穴部に挿入可能となっており、第一溝部の形成位置とは回転方向で異なる位置で穴部に挿入された第一突起部が、穴部の内部で第一溝部に位置することができるので、第一溝部が、第一回転体の穴部の第二回転体側端部まで延びておらず、途中で止まった構成であっても、第一突起部を第一溝部に位置させることができる。
さらに、第一溝部に位置した後、第二回転体側へ前記第一溝部内を前記第一突起部が移動して、組み付けられるので、第二溝部と第二突起部との回転方向の位相が合っておらず、第二回転体により連結部材が押し込まれたて、第一挿入部が穴部内部へ移動したとき、第一突起部が、第一溝部の形成位置とは回転方向で異なる位置で穴部に挿入された第一突起部が、穴部の内部で第一溝部に位置するところに、到達してしまうのを抑制することができる。これにより、第一突起部が、第一溝部から外れてしまうのを抑制することができる。 What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect 1)
On the inner peripheral surface of the first rotating body such as a photosensitive member gear 82 having a hole at the rotation center, the second rotating body such as the coupling member 41 having a hole at the rotation center, and the hole of the first rotating body The first groove such as an axially extending drive groove 85 provided in the axial direction, the second groove such as an axially extending driven groove 142 provided on the inner circumferential surface of the hole of the second rotary member, and the first groove It has first projections such as drive side projections 94a and 94b projecting in the radial direction to be engaged with the one groove, and is engaged with the first insertion part 90a and the second groove that are inserted into the holes of the first rotating body. A second insertion portion 90b having a projection portion such as a driven projection portion 95a projecting in the radial direction to be mated and inserted into the hole of the second rotating body; and the first insertion portion 90a and the second insertion portion 90b Drive transmission device having a connecting portion 93 for connecting the first rotating body and the second rotating body. The first insertion portion 90a is axially movable in the hole portion of the first rotating body, and the first projection portion is at a position different from the formation position of the first groove portion in the rotational direction. The first protrusion inserted into the hole at a position different from the formation position of the first groove in the rotational direction, which can be inserted into the hole of the single rotation body, is located in the first groove inside the hole. And after the first groove portion is located in the first groove portion, the hole portion and the first groove portion of the first rotary body are configured so that the first protrusion portion can move in the first groove portion toward the second rotary body side. The maximum outer diameter of the insertion portion 90b was made smaller than the inner diameter of the hole portion of the first rotating body.
As described above, in the drive transmission device under development, the connecting member 90 cannot be sufficiently shortened. This is because the communication portion 84 in which the guide grooves 86a and 86b communicate with the first groove portion such as the drive side groove portion 85, the second groove portion such as the driven side groove portion 142 and the second projection such as the driven side projection 95a. The first protrusions such as the drive-side protrusions 94a and 94b move in the first groove when the connecting member 90 is pushed in by the second rotating body such as the coupling member 41 because the phases in the rotation direction are not matched. It is necessary to provide it on the inner side of the hole than the moving range. When the communication part 84 is within the movement range, there is the following problem. That is, the phase of the rotation direction of the second groove portion and the second protrusion portion is not matched, and the connecting member 90 is pushed in by the second rotating body, the first protrusion portion moves in the first groove portion, and the communication portion 84. When the connection member 90 rotates to some time when approaching, the first projection part moves from the first groove part to the guide grooves 86a and 86b through the communication part 84. Then, the connecting member 90 can not be pushed any more and the second rotating body can not be brought into the defined position in the apparatus. Further, once the second rotating body is separated from the connecting member 90 in order to reassemble the second rotating body, the connecting member 90 moves to the second rotating body side by the biasing force of the coil spring 73. At this time, the first projection moves in the guide groove and the first projection slips out of the hole, and the connecting member 90 is detached from the hole of the first rotary body. In order to prevent this problem, it is necessary to provide the communicating portion 84 on the inner side of the hole than the above-mentioned moving range. Therefore, the connecting member is set so that the length from the first protruding portion to the second protruding portion is longer than the length from the second rotating body side end portion of the first rotating body hole portion to the communication portion between the first groove portion and the guide groove. 90 must be configured. This is because if the length from the first projection to the second projection is shorter than the length from the second rotary member side end of the first rotary body hole to the communicating portion 84, the first projection can be made into the first groove It is because it can not be located in Specifically, if the position of the second protrusion in the rotational direction and the position of the first protrusion in the rotational direction are different from each other, the second insertion portion may be inserted before the first protrusion reaches the communication portion 84. The second projection abuts against the second rotary body side end face of the hole of the first rotary body, and the first projection can not be positioned in the guide grooves 86a and 86b. In addition, when the position of the first protrusion in the rotation direction is the same as the position of the second protrusion in the rotation direction, the second protrusion enters the guide grooves 86a and 86b, and the first protrusion reaches the communication portion 84. it can. However, the second protrusion abuts on the side surfaces of the guide grooves 86a and 86b, so that the connecting member 90 can not be rotated, and the first protrusion can not be positioned in the guide groove through the communication portion 84.
As described above, in the drive transmission device under development, at least the length from the first protrusion to the second protrusion is the first groove and the guide groove from the second rotary member side end of the first rotary member hole. It is necessary to form the connecting member 90 so as to be longer than the length up to the point of communication with 86a and 86b, and the connecting member 90 can not be made sufficiently short.
On the other hand, in (Aspect 1), since the maximum outer diameter of the second insertion portion is smaller than the inner diameter of the hole portion of the first rotating body, the second insertion portion is inserted into the hole portion of the first rotating body can do. Thereby, even if it is a connection member shorter than the length from the end part of the hole part of the 1st rotary body to the location where the projection part of the 1st insertion part is located in the 1st groove part from the 2nd rotary body side end, Can be assembled to a single rotating body. Specifically, the first insertion portion is inserted into the hole of the first rotary body to a point where the first projection is positioned in the first groove by the second insertion portion entering the hole of the first rotary body. can do. Moreover, a connection member can be rotated in the state which the 2nd insertion part was inserted in the hole of a 1st rotary body. As a result, the first projection can be positioned in the first groove, and the coupling member can be assembled to the first rotating body.
Further, in (aspect 1), the first insertion portion is configured to be movable in the axial direction in the hole portion of the first rotating body. Thereby, when the phase of the rotation direction of a 2nd groove part and a 2nd projection part does not match, and a 2nd insertion part is not inserted in the hole of a 2nd rotary body, a 1st insertion part is a 1st rotary body. The second rotary body can be positioned at a predetermined position in the apparatus even if it moves in the hole and the second insertion portion is not inserted into the hole of the second rotary body.
In addition, the first protrusion can be inserted into the hole of the first rotary member at a position different from the formation position of the first groove in the rotational direction, and is different from the formation position of the first groove in the rotational direction Since the first protrusion inserted into the hole at the position can be positioned in the first groove inside the hole, the first groove extends to the second rotating body side end of the hole of the first rotating body. Even if the configuration does not extend and stops halfway, the first protrusion can be positioned in the first groove.
Further, after being positioned in the first groove portion, the first projection portion is moved and assembled in the first groove portion toward the second rotating body, so that the phase in the rotation direction between the second groove portion and the second projection portion is When the connecting member is pushed in by the second rotating body and the first insertion portion moves into the hole portion, the first projecting portion is different from the formation position of the first groove portion in the rotational direction. It can suppress that the 1st projection part inserted in the hole part reaches to a place located in a 1st groove part inside a hole part. Thereby, it can suppress that a 1st projection part remove | deviates from a 1st groove part.

（態様２）
（態様１）において、駆動側溝部８５などの第一溝部には、駆動側突起部９４ａ,９４ｂなどの第一突起部が第一溝部から抜けるのを止める抜け止め部８５ａを有し、感光体ギヤ８２の第一回転体の穴部には、第一溝部の形成位置とは、回転方向で異なる位置に開口を有し、軸方向に延びて第一挿入部９０ａを穴部に挿入するときに、第一突起部を穴部内部へ案内する案内溝部８６ａ,８６ｂと、案内溝部と第一溝部とを連通する連通部８４とを有する
これによれば、連結部材９０がカップリング部材などの第二回転体側へ移動したとき、駆動側突起部９４ａ，９４ｂなどの第一突起部が抜け止め部８５ａに突き当たり、連結部材９０の第一挿入部９０ａが、感光体ギヤ８２などの第一回転体から抜けるのを防止することができる。
また、案内溝部８６ａ,８６ｂに駆動側突起部９４ａ,９４ｂなどの第一突起部を挿入し、案内溝部８６ａ,８６ｂと駆動側溝部８５などの第一溝部との連通部８４に位置するまで、第一突起部を案内溝部８６ａ,８６ｂに挿入する。そして、連結部材９０を回転させることで、案内溝部８６ａ,８６ｂ内の第一突起部を連通部８４を通って、第一溝部へ移動させることができ、穴部内で、第一突起部を第一溝部に位置させることができる。抜け止め部が、感光体ギヤなどの回転体の一体成型で成型されたものであっても、第一突起部を第一溝部に位置させることができ、第一挿入部を穴部に挿入できる。これにより、回転体とは別部材の抜け止め部材を設けて、連結部材を回転体に取り付けた後、抜け止め部材を回転体組み付ける特許文献１に記載の構成に比べて、部品点数を削減することができる。これにより、装置のコストダウンや、組み立て工数の削減を図ることができる。 (Aspect 2)
In (Aspect 1), the first groove such as the drive groove 85 has a retaining portion 85a for stopping the first protrusions such as the drive protrusions 94a and 94b from coming off the first groove, and The hole of the first rotary member of the gear 82 has an opening at a position different from the position where the first groove is formed in the rotational direction, and extends in the axial direction to insert the first insertion portion 90a into the hole In addition, the guide groove portions 86a and 86b for guiding the first protrusion portion to the inside of the hole portion, and the communication portion 84 for communicating the guide groove portion and the first groove portion, the connecting member 90 is a coupling member or the like. When moving to the second rotary body side, the first protrusions such as the drive side protrusions 94a and 94b abut against the retaining portions 85a, and the first insertion portion 90a of the connecting member 90 performs the first rotation of the photosensitive gear 82 or the like. It is possible to prevent the body from coming off.
In addition, the first protrusions such as the drive side protrusions 94a and 94b are inserted into the guide grooves 86a and 86b, and the guide grooves 86a and 86b are positioned in the communication portion 84 between the first grooves such as the drive groove 85 and the like. The first protrusions are inserted into the guide grooves 86a and 86b. Then, by rotating the connecting member 90, the first projection in the guide groove 86a, 86b can be moved to the first groove through the communication part 84, and the first projection can be moved in the hole. It can be located in one groove part. Even if the retaining portion is formed by integral molding of a rotating body such as a photoconductor gear, the first protrusion can be positioned in the first groove and the first insertion portion can be inserted into the hole. . Accordingly, the number of parts is reduced as compared with the configuration described in Patent Document 1 in which a retaining member that is a separate member from the rotating body is provided, the connecting member is attached to the rotating body, and then the retaining member is assembled to the rotating body. be able to. As a result, the cost of the apparatus can be reduced and the number of assembling steps can be reduced.

（態様３）
（態様２）において、駆動側突起部９４ａ,９４ｂなどの第一突起部の第二挿入部側端部から、従動側突起部９５ａなどの第二突起部の第一挿入部側端部までの長さＬ１が、第一回転体の穴部の第二回転体側端部から前記連通部８４までの長さＬ２よりも短い。
これによれば、実施形態で説明したように、駆動側突起部９４ａ,９４ｂなどの第一突起部の第二挿入側端部から、従動側突起部９５ａなどの第二突起部までの長さＬ１が、感光体ギヤ８２などの第一回転体の駆動側筒状部８２ａなどの穴部の第二回転体側端部から前記連通部８４までの長さＬ２以上の連結部材９０に比べて、連結部材の長さを短くすることができる。これにより、感光体ギヤ８２などの第一回転体と、カップリング部材４１などの第二回転体との距離を近づけることができ、装置の軸方向長さを短くすることが可能となり、装置の小型化を図ることができる。 (Aspect 3)
In (Aspect 2), from the second insertion portion side end of the first projection such as the drive side projections 94a and 94b to the first insertion side end of the second projection such as the driven side projection 95a The length L1 is shorter than the length L2 from the second rotary body side end of the hole of the first rotary body to the communication portion 84.
According to this, as described in the embodiment, the length from the second insertion-side end of the first projection such as the drive-side projections 94a and 94b to the second projection such as the driven-side projection 95a Compared to the connecting member 90 having a length L2 or more from the second rotary member side end of the hole of the drive side cylindrical portion 82a of the first rotary member such as the photosensitive gear 82 to the communication portion 84, L1 is The length of the connecting member can be shortened. As a result, the distance between the first rotating body such as the photosensitive gear 82 and the second rotating body such as the coupling member 41 can be reduced, and the axial length of the device can be shortened. Miniaturization can be achieved.

（態様４）
（態様１）乃至（態様３）いずれかにおいて、駆動側突起部９４ａ,９４ｂなどの第一突起部および従動側突起部９５ａなどの第二突起部の駆動伝達時に溝部と当接する溝部当接箇所が、回転方向に突出し、かつ、径方向に真直ぐ延びる形状とした。
これによれば、先の図２１〜図２５を用いて説明したように、回転速度変動を抑制することができる。 (Aspect 4)
In any one of (Aspect 1) to (Aspect 3), the groove portion contact portion that contacts the groove portion during driving transmission of the first protrusion portion such as the drive side protrusion portions 94a and 94b and the second protrusion portion such as the driven side protrusion portion 95a. But have a shape that protrudes in the rotational direction and extends straight in the radial direction.
According to this, as explained with reference to FIGS. 21 to 25 above, the rotational speed fluctuation can be suppressed.

（態様５）
（態様１）乃至（態様４）いずれかにおいて、各挿入部９０ａ,９０ｂは、球状の球状部（駆動側球状部９１、従動側球状部９２）を備え、軸方向をＸ方向、前記Ｘ方向に直交する方向のうちある特定の方向をＹ方向、前記Ｘ方向および前記Ｙ方向いずれにも直交する方向をＺ方向としたとき、各挿入部の球状部は、球のＸ方向と直交する大円部分（第一駆動側大円部９１ａ,第一従動側大円部９２ａ）と、球のＹ方向と直交する大円部分（第三駆動側大円部９１ｃ,第三従動側大円部９２ｃ）と、球のＺ方向と直交する大円部分（第二駆動側大円部９１ｂ,第二従動側大円部９２ｂ）とを残して肉抜きした球形状とした。
これによれば、図７を用いて説明したように、各挿入部のヒケを抑制することができ、精度よく各挿入部を成型することができる。また、一方向（Ｙ１方向）に移動する第一金型３９１と、第一金型３９１とは逆方向に移動する第二金型３９２とを用いて連結部材９０を成型することができ、図６に示した各挿入部の内部を肉抜きする構成に比べて、金型の数を少なくすることができる。また、連結部材の連結部が長くても、各挿入部を、均等に肉抜きすることができる。これにより、連結部材の連結部が長くても、各挿入部のヒケを良好に抑制でき、各挿入部を精度よく成型することができる。また、各挿入部の内部を肉抜きする構成に比べて、連結部の直径を小さくすることができ、連結部材の小型化を図ることができる。 (Aspect 5)
In any one of (Aspect 1) to (Aspect 4), each insertion portion 90a, 90b includes a spherical spherical portion (a driving-side spherical portion 91, a driven-side spherical portion 92), the axial direction is the X direction, and the X direction When a specific direction among the directions orthogonal to the Y direction is the Y direction, and the direction orthogonal to both the X direction and the Y direction is the Z direction, the spherical portion of each insertion portion is A circular portion (first drive side large circle portion 91a, a first driven side large circle portion 92a), and a large circle portion orthogonal to the Y direction of the ball (a third drive side large circle portion 91c, a third driven side large circle portion 92c) and a large circle portion (second drive side large circle portion 91b, second driven side large circle portion 92b) orthogonal to the Z direction of the ball, and it has a spherical shape with a thin wall.
According to this, as described with reference to FIG. 7, it is possible to suppress the sink of each insertion portion, and it is possible to mold each insertion portion with high accuracy. Further, the connecting member 90 can be molded using the first mold 391 moving in one direction (Y1 direction) and the second mold 392 moving in the opposite direction to the first mold 391, as shown in FIG. Compared to the configuration in which the inside of each insertion portion shown in 6 is thinned, the number of molds can be reduced. Moreover, even if the connection part of a connection member is long, each insertion part can be equally thinned. Thereby, even if the connection part of a connection member is long, the sink of each insertion part can be suppressed favorably, and each insertion part can be shape | molded accurately. In addition, the diameter of the connecting portion can be reduced compared to a configuration in which the inside of each insertion portion is thinned, and the connecting member can be reduced in size.

（態様６）
（態様５）において、前記連結部９３を、前記Ｙ方向に延びる直線部分と前記Ｚ方向に延びる直線部分とからなる断面十字形状の肉抜き部９３ａと、断面矩形状の補強部とが、前記Ｘ方向に交互に形成された形状にした。
これによれば、実施形態で説明したように、上記第一金型３９１と、上記第二金型３９２とを用いて連結部の肉抜きを行うことができ、連結部のヒケを抑制し、連結部９３を精度よく成型することができる。 (Aspect 6)
In (Aspect 5), the connecting portion 93 is a cross-sectioned lightening portion 93a having a cross section having a straight portion extending in the Y direction and a straight portion extending in the Z direction, and a reinforcing portion having a rectangular cross section It was made into the shape alternately formed in the X direction.
According to this, as described in the embodiment, thinning of the connecting part can be performed using the first mold 391 and the second mold 392, and the sinking of the connecting part is suppressed. The connecting portion 93 can be accurately molded.

（態様７）
（態様１）乃至（態様６）いずれかにおいて、感光体ギヤ８２などの第一回転体と、カップリング部材４１などの第二回転体との回転方向の位相を合わせる位相合わせ手段を有する。
これによれば、実施形態で示したように、感光体ギヤなどの第一回転体の一回転周期の速度変動とカップリング部材などの第二回転と同じ軸に取り付けられた感光体などの回転体の一回転周期の速度変動とにより生じる、回転体の速度変動を常に同じにできる。これにより、回転体の速度変動の抑制制御のためのデータとり（回転体一回転の速度変動を、エンコーダなどを用いて計測）や、色ずれ抑制制御のためのデータ取り（パッチパターンを形成し、それを光学センサで検知して、色ずれ度合いを把握する）を、感光体などの回転体の着脱の都度、実施する必要がなくなり、装置の制御を簡素化することができる。 (Aspect 7)
In any of (Aspect 1) to (Aspect 6), there is provided a phase alignment means for adjusting the phase of the rotational direction of the first rotary body such as the photosensitive gear 82 and the second rotary body such as the coupling member 41.
According to this, as shown in the embodiment, the speed fluctuation of one rotation cycle of the first rotating body such as the photosensitive gear and the rotation of the photosensitive body mounted on the same shaft as the second rotation such as the coupling member The speed variation of the rotating body caused by the speed variation of one rotation period of the body can always be made the same. As a result, data acquisition for suppression control of the speed fluctuation of the rotary body (measurement of the speed fluctuation of one rotation of the rotary body using an encoder etc.) and data acquisition for color shift suppression control (patch pattern formed It is not necessary to carry out the detection of the degree of color shift by detecting the degree of color shift with an optical sensor every time the rotating body such as the photosensitive body is attached and detached, and the control of the apparatus can be simplified.

（態様８）
（態様７）において、上記位相合わせ手段は、前連結部材９０と感光体ギヤ８２などの第一回転体との回転方向の位相を合わせる第一位相合わせ部（本実施形態では、第二駆動側突起部９４ｂ,第二案内溝部８６ｂとで構成）と、前記連結部材９０とカップリング部材４１などの第二回転体との位相を合わせる第二位相合わせ部（本実施形態では、従動側球状部９２と位相合わせ凸部１４４とで構成）とを有する。
これによれば、図１４に示すように、感光体ギヤ８２などの第一回転体に連結部材９０が回転方向で規定の位相で取り付けられる。そして、カップリング部材４１などの第二回転体が、感光体ギヤ８２などの第一回転体に規定の位相で取り付けられた連結部材９０に規定の位相で取り付けられる。これにより、連結部材９０を介して、第一回転体と第二回転体とを規定の位相にすることができる。 (Aspect 8)
In (aspect 7), the phasing means is a first phasing portion (in the present embodiment, the second drive side) for bringing the phases of the rotational directions of the front connecting member 90 and the first rotating body such as the photosensitive gear 82 into alignment. A projecting portion 94b and a second guide groove portion 86b), and a second phase matching portion for matching the phases of the connecting member 90 and the second rotating body such as the coupling member 41 (in this embodiment, the driven side spherical portion). 92 and the phase matching convex portion 144).
According to this, as shown in FIG. 14, the connecting member 90 is attached to the first rotating body such as the photoconductor gear 82 with a specified phase in the rotation direction. Then, a second rotating body such as the coupling member 41 is attached at a predetermined phase to the connecting member 90 attached to the first rotating body such as the photosensitive gear 82 at a predetermined phase. Thereby, the first rotating body and the second rotating body can be set to a prescribed phase via the connecting member 90.

（態様９）
（態様８）において、第一位相合わせ部および前記第二位相合わせ部の少なくとも一方は、挿入部に設けられ、径方向に突出する第二駆動側突起部９４ｂなどの位相合わせ用突起部と、前記位相合わせ用突起部を有する第一挿入部９０ａなどの挿入部が挿入される感光体ギヤ８２などの回転体の駆動側筒状部８２ａなどの穴部に設けられ、その挿入部を前記穴部に挿入するときに前記位相合わせ用突起部が挿入される第二案内溝部８６ｂなどの位相合わせ用溝部とで構成され、前記位相合わせ用突起部の形状を第一駆動側突起部９４ａなどの突起部の形状と異ならせ、位相合わせ用溝部の形状を、挿入部が前記穴部に挿入するときに前記突起部が挿入される第一案内溝部８６ａなどの溝部の形状と異ならせて、位相合わせ用突起部を、位相合わせ用溝部にのみ挿入可能な構成とした。
これによれば、実施形態で説明したように、連結部材９０と感光体ギヤ８２などの回転体が規定の位相のときに、第一駆動側突起部９５ａなどの突起部と、形状が異なる第二駆動側突起部９４ｂなどの位相あわせ突起部が、第二案内溝部８６ｂなどの位相合わせ用溝部にのみに挿入することができ、連結部材９０と回転体との位相を規定の位相に合わせることができる。
なお、ここで言う「形状が異なる」とは、形または大きさが異なる（非合同）ことを言う。 (Aspect 9)
In (Aspect 8), at least one of the first phasing portion and the second phasing portion is provided in the insertion portion, and is provided with a phasing projection such as a second drive-side protrusion 94b that protrudes in the radial direction; The insertion portion such as the first insertion portion 90a having the phasing projection portion is provided in a hole portion such as the driving side cylindrical portion 82a of the rotating body such as the photosensitive gear 82 into which the insertion portion is inserted. And the phasing groove such as the second guide groove 86b into which the phasing protrusion is inserted when inserted into the portion, and the shape of the phasing protrusion is set to the first drive side protrusion 94a or the like Different from the shape of the projection, the phase of the phase matching groove is different from the shape of the groove such as the first guide groove 86a into which the projection is inserted when the insertion portion is inserted into the hole. Set the alignment protrusion to It was only inserted that can be configured in the groove for the cause.
According to this, as described in the embodiment, when the connecting member 90 and the rotating body such as the photosensitive member gear 82 are in the prescribed phase, the shape is different from the projecting portion such as the first driving side projecting portion 95a. The phasing protrusion such as the second drive side protrusion 94b can be inserted only into the phasing groove such as the second guide groove 86b, and the phasing of the coupling member 90 and the rotor can be matched to the prescribed phase. Can do.
In addition, "the shape is different" said here means that shapes or sizes are different (non-congruent).

（態様１０）
（態様８）または（態様９）において、前記第一位相合わせ部および前記第二位相合わせ部の少なくとも一方を、従動側穴部１４３などの穴部の底面に設けた軸方向に突出する位相合わせ凸部１４４などの凸形状部と、従動側球状部９２などの挿入部をこの穴部に挿入したときに前記凸形状部と非接触となるように前記挿入部に形成された切り欠き部（第三従動側大円部９２ｃが切りかかれた部分）とで構成した。
これによれば、カップリング部材４１などの回転体と、連結部材９０とが規定の位相のとき、位相合わせ凸部１４４などの凸形状部が、従動側球状部９２などの挿入部の第三従動側大円部９２ｃが切りかかれた部分である切り欠き部に入り込み、回転体の穴部に連結部材９０の従動側球状部９２などの挿入部を挿入することができ、連結部材と回転体とを駆動連結できる。 (Aspect 10)
In (Aspect 8) or (Aspect 9), at least one of the first phasing portion and the second phasing portion is provided on the bottom surface of a hole such as the driven side hole 143 or the like, and projects in the axial direction A notch formed in the insertion portion so as not to be in contact with the projection when the projection such as the projection 144 and the insertion portion such as the driven spherical portion 92 are inserted into the hole. (The part where the third driven side large circle part 92c was cut).
According to this, when the rotating body such as the coupling member 41 and the connection member 90 are in a prescribed phase, the convex shaped portion such as the phasing convex portion 144 is the third of the insertion portion such as the driven spherical portion 92 or the like. The driven side large circle portion 92c enters a notch which is a cut portion, and an insertion portion such as the driven side spherical portion 92 of the connecting member 90 can be inserted into the hole of the rotating body, and the connecting member and the rotating body Can be connected.

（態様１１）
（態様１）乃至（態様１０）いずれかにおいて、駆動側溝部８５などの第一溝部には、駆動側突起部９４ａ，９４ｂなどの第一突起部が第一溝部から抜けるのを止める抜け止め部８５ａを有し、感光体ギヤ８２などの第一回転体の穴部には、第一溝部の形成位置とは、回転方向で異なる位置に開口を有し、軸方向に延びて第一挿入部９０ａを穴部に挿入するときに、第一突起部を穴部内部へ案内する案内溝部８６ａ，８６ｂと、該案内溝部と前記第一溝部とを連通する連通部８４とを有し、前記第一突起部が、前記連通部８４を通って、前記第一溝部から前記案内溝部へ移動するのを規制する規制突起部１０２などの規制手段を設けた。
これによれば、実施形態で説明したように、駆動側溝部８５などの溝部に挿入された駆動側突起部９４ａ,９４ｂなどの突起部が、連通部８４を通って、駆動側溝部８５などの溝部から案内溝部８６ａ,８６ｂへ移動し、そして、連結部材が感光体ギヤなどの回転体から抜け出してしまうのを防止することができる。 (Aspect 11)
In any of (Aspect 1) to (Aspect 10), the first groove such as the drive groove 85 is a retaining portion that stops the first projection such as the drive projections 94a and 94b from coming off the first groove. The first insertion member has an opening at a position different from the position where the first groove is formed in the hole of the first rotary member such as the photosensitive gear 82, and has an opening extending in the axial direction. And a guide groove 86a, 86b for guiding the first projection into the hole when the 90a is inserted into the hole, and a communicating portion 84 for communicating the guide groove with the first groove; A control means such as a control projection 102 is provided which restricts one projection from moving from the first groove to the guide groove through the communication portion 84.
According to this, as described in the embodiment, the protrusions such as the drive side protrusions 94 a and 94 b inserted in the grooves such as the drive groove 85 pass through the communication portion 84 to form the drive groove 85 or the like. By moving from the groove to the guide groove 86a, 86b, it is possible to prevent the connecting member from coming off the rotating body such as the photosensitive gear.

（態様１２）
（態様１）乃至（態様１１）のいずれかにおいて、前記連結部材９０は、感光体ギヤ８２などの第一回転体に軸方向に移動可能に取り付けられており、連結部材９０を、カップリング部材４１などの第二回転体側に向かって付勢するコイルスプリング７３などの付勢手段を設けた。
これによれば、実施形態で説明したように、カップリング部材４１などの第二回転体と連結部材９０とを連結するときに、第二回転体と連結部材との回転方向の位相が合っておらず、従動側球状部９２などの挿入部が第二回転体に挿入されていないときでも、連結部材９０がコイルスプリング７３などの付勢手段の付勢力に抗して軸方向に移動して、第二回転体が取り付けられた感光体などの回転体を、装置本体に装着することができる。そして、駆動が開始され、連結部材が回転駆動して、連結部材と第二回転体との位相が合うと、付勢手段の付勢力で連結部材が軸方向に移動して、第二挿入部９０ｂが第二回転体の穴部に挿入され、第二回転体と連結部材とが駆動連結され、第二回転体を回転駆動させることができる。 (Aspect 12)
In any of (Aspect 1) to (Aspect 11), the connecting member 90 is axially movably attached to a first rotating body such as a photosensitive gear 82, and the connecting member 90 is a coupling member. A biasing means such as a coil spring 73 is provided to bias toward the second rotary body such as 41.
According to this, as described in the embodiment, when the second rotating body such as the coupling member 41 and the connecting member 90 are connected, the phase of the second rotating body and the connecting member in the rotational direction is matched. Even when the insertion portion such as the driven side spherical portion 92 is not inserted into the second rotary body, the connecting member 90 axially moves against the urging force of the urging means such as the coil spring 73 The rotating body such as a photosensitive body to which the second rotating body is attached can be attached to the apparatus main body. Then, when the drive is started, the connecting member is driven to rotate, and the connecting member and the second rotating body are in phase, the connecting member moves in the axial direction by the biasing force of the biasing means, and the second insertion portion 90b is inserted into the hole of the second rotary body, and the second rotary body and the connection member are drivingly connected, and the second rotary body can be rotationally driven.

（態様１３）
画像形成装置は、（態様１）乃至（態様１２）いずれかの駆動伝達装置を備えている。
これによれば、駆動伝達装置により伝達される感光体ドラム４０などの回転速度変動を抑制することができ、良好な画像を形成することができる。また、画像形成装置の小型化を図ることができる。 (Aspect 13)
The image forming apparatus includes the drive transmission device according to any one of (Aspect 1) to (Aspect 12).
Accordingly, fluctuations in the rotational speed of the photosensitive drum 40 and the like transmitted by the drive transmission device can be suppressed, and a good image can be formed. In addition, the image forming apparatus can be miniaturized.

１ｂ：奥側側板
１８：トナー像形成ユニット
４０：感光体ドラム
４０ａ：ドラム軸
４１：カップリング部材
４１ａ：軸挿入部
４１ｂ：従動側筒状部
７０：駆動伝達装置
７３：コイルスプリング
８２：感光体ギヤ
８２ａ：駆動側筒状部
８３：駆動側穴部
８４：連通部
８５：駆動側溝部
８５ａ：抜け止め部
８６ａ：第一案内溝部
８６ｂ：第二案内溝部
８７：駆動側穴部
９０：連結部材
９０ａ：第一挿入部
９０ｂ：第二挿入部
９１：駆動側球状部
９１ａ：第一駆動側大円部
９１ｂ：第二駆動側大円部
９１ｃ：第三駆動側大円部
９２：従動側球状部
９２ａ：第一従動側大円部
９２ｂ 第二従動側大円部
９２ｃ：第三従動側大円部
９３：連結部
９３ａ：肉抜き部
９４ａ：第一駆動側突起部
９４ｂ：第二駆動側突起部
９５ａ：従動側突起部
９６：バネ受け
１００：軸受け
１０１：筒状の受け部
１０２：規制突起部
１４２：従動側溝部
１４３：従動側穴部
１４４：位相合わせ突起部
１９０：連結部材
１９１：球状部
１９３：肉抜き部
１９５：従動側突起部
３９１：第一金型
３９２：第二金型
３９３：第三金型
４１１：平行ピン
４１２：貫通孔
Ｏ１：回転中心軸
Ｏ２：回転中心軸
θｙ：中心角 1b: back side plate 18: toner image forming unit 40: photosensitive drum 40a: drum shaft 41: coupling member 41a: shaft insertion portion 41b: driven side cylindrical portion 70: drive transmission device 73: coil spring 82: photoconductor Gear 82a: Drive-side cylindrical part 83: Drive-side hole 84: Communication part 85: Drive-side groove 85a: Retaining part 86a: First guide groove 86b: Second guide groove 87: Drive-side hole 90: Connection member 90a: first insertion part 90b: second insertion part 91: driving side spherical part 91a: first driving side great circle part 91b: second driving side great circle part 91c: third driving side great circle part 92: driven side spherical part Part 92a: First driven side large circle part 92b Second driven side large circle part 92c: Third driven side large circle part 93: Coupling part 93a: Lightening part 94a: First drive side projection part 94b: Second drive side Protrusions 95a: follower projections 96: spring retainers 1 00: bearing 101: cylindrical receiving portion 102: regulating projection 142: driven side groove 143: driven side hole 144: phase matching projection 190: connecting member 191: spherical portion 193: lightening portion 195: driven side projection Part 391: first mold 392: second mold 393: third mold 411: parallel pin 412: through hole O1: rotation center axis O2: rotation center axis θy: center angle

特開２０１３−１９５９６１号公報JP2013-195961A

Claims (13)

回転中心に穴部を有する第一回転体と、
回転中心に穴部を有する第二回転体と、
前記第一回転体の穴部の内周面に設けられた軸方向に延びる第一溝部と、
前記第二回転体の穴部の内周面に設けられた軸方向に延びる第二溝部と、
前記第一溝部に係合する径方向に突出した第一突起部を有し、前記第一回転体の穴部に挿入される第一挿入部、前記第二溝部に係合する径方向に突出した第二突起部を有し、前記第二回転体の穴部に挿入される第二挿入部、および、前記第一挿入部と前記第二挿入部と繋ぐ連結部を有し、前記第一回転体と前記第二回転体とを連結する連結部材とを備えた駆動伝達装置であって、
前記第一挿入部が、前記第一回転体の穴部内を軸方向に移動可能であり、
前記第一溝部の形成位置とは、回転方向で異なる位置で前記第一突起部が前記第一回転体の穴部に挿入可能であり、前記第一溝部の形成位置とは回転方向で異なる位置で穴部に挿入された第一突起部が、穴部の内部で前記第一溝部に位置することができ、かつ、第一溝部に位置した後、第二回転体側へ前記第一溝部内を前記第一突起部が移動できるように、第一回転体の穴部および第一溝部を構成し、
前記第二挿入部の最大外径を、前記第一回転体の穴部の内径よりも小さくしたことを特徴とする駆動伝達装置。 A first rotating body having a hole at the center of rotation;
A second rotating body having a hole at the center of rotation;
An axially extending first groove portion provided on an inner peripheral surface of the hole portion of the first rotating body;
An axially extending second groove provided on an inner peripheral surface of the hole of the second rotating body;
A radially inserted first projection inserted into the hole of the first rotating body, and a radially projected engagement with the second groove, the first projection having a radially protruding engagement engaged with the first groove A second insertion portion inserted into the hole of the second rotary body, and a connecting portion connecting the first insertion portion and the second insertion portion, A drive transmission device comprising: a connecting member connecting a rotating body and the second rotating body,
The first insertion portion is axially movable in the hole portion of the first rotating body;
The first protrusion can be inserted into the hole of the first rotating body at a position different from the formation position of the first groove in the rotational direction, and the position different from the formation position of the first groove in the rotational direction The first protrusion inserted into the hole in the hole can be located in the first groove inside the hole, and after being located in the first groove, the inside of the first groove toward the second rotary body The hole portion and the first groove portion of the first rotating body are configured to move the first projection portion,
The second maximum outer diameter of the insertion portion, the dynamic transmission drive characterized in that it is smaller than the inner diameter of the hole of the first rotating body. 請求項１に記載の駆動伝達装置であって、
前記第一溝部には、前記第一突起部が前記第一溝部から抜けるのを止める抜け止め部を有し、
前記第一回転体の穴部には、前記第一溝部の形成位置とは、回転方向で異なる位置に開口を有し、軸方向に延びて前記第一挿入部を穴部に挿入するときに、前記第一突起部を穴部内部へ案内する案内溝部と、該案内溝部と前記第一溝部とを連通する連通部とを有することを特徴とする駆動伝達装置。 The drive transmission apparatus according to claim 1,
The first groove portion has a retaining portion that stops the first protruding portion from coming off from the first groove portion,
The hole of the first rotary body has an opening at a position different from the position where the first groove is formed in the rotational direction, and extends in the axial direction to insert the first insertion portion into the hole A drive transmission device comprising: a guide groove for guiding the first protrusion into the hole; and a communicating portion for communicating the guide groove with the first groove. 請求項２に記載の駆動伝達装置において、
前記第一突起部の第二挿入部側端部から、前記第二突起部の第一挿入部側端部までの長さが、前記第一回転体の穴部の第二回転体側端部から前記連通部までの長さよりも短いことを特徴とする駆動伝達装置。 The drive transmission device according to claim 2, wherein
The length from the second insertion portion side end portion of the first projection portion to the first insertion portion side end portion of the second projection portion is from the second rotation body side end portion of the hole portion of the first rotation body A drive transmission device characterized in that it is shorter than the length to the communication part. 請求項１乃至３いずれかに記載の駆動伝達装置において、
前記第一突起部および前記第二突起部の駆動伝達時に溝部と当接する溝部当接箇所が、回転方向に突出し、かつ、径方向に真直ぐ延びる形状としたことを特徴とする駆動伝達装置。 The drive transmission device according to any one of claims 1 to 3.
A drive transmission device characterized in that a groove contact portion that contacts the groove during drive transmission of the first protrusion and the second protrusion protrudes in the rotational direction and extends straight in the radial direction. 請求項１乃至４いずれかに記載の駆動伝達装置において、
各挿入部は、球状の球状部を備え、
軸方向をＸ方向、前記Ｘ方向に直交する方向のうちある特定の方向をＹ方向、前記Ｘ方向および前記Ｙ方向いずれにも直交する方向をＺ方向としたとき、
各挿入部の球状部は、球のＸ方向と直交する大円部分と、球のＹ方向と直交する大円部分と、球のＺ方向と直交する大円部分とを残して肉抜きした形状であることを特徴とする駆動伝達装置。 The drive transmission device according to any one of claims 1 to 4.
Each insert comprises a spherical bulb,
Assuming that an axial direction is an X direction, and a specific direction of the directions orthogonal to the X direction is a Y direction, and a direction orthogonal to both the X direction and the Y direction is a Z direction.
The spherical portion of each insertion portion has a shape which is cut away leaving the great circle portion orthogonal to the X direction of the sphere, the great circle portion orthogonal to the Y direction of the sphere, and the great circle portion orthogonal to the Z direction of the sphere A drive transmission device characterized by the above. 請求項５に記載の駆動伝達装置において、
前記連結部を、前記Ｙ方向に延びる直線部分と前記Ｚ方向に延びる直線部分とからなる断面十字形状の肉抜き部と、断面矩形状の補強部とが、前記Ｘ方向に交互に形成された形状にしたことを特徴とする駆動伝達装置。 The drive transmission device according to claim 5, wherein
A cross-section cross-sectional light-cut portion consisting of a straight portion extending in the Y direction and a straight portion extending in the Z direction and a reinforcing portion having a rectangular cross section are alternately formed in the X direction. A drive transmission device characterized by having a shape. 請求項１乃至６いずれかに記載の駆動伝達装置において、
前記第一回転体と、前記第二回転体との回転方向の位相を合わせる位相合わせ手段を有することを特徴とする駆動伝達装置。 The drive transmission apparatus according to any one of claims 1 to 6.
A drive transmission device comprising phase adjusting means for adjusting a phase in a rotation direction between the first rotating body and the second rotating body. 請求項７に記載の駆動伝達装置において、
上記位相合わせ手段は、前記連結部材と前記第一回転体との回転方向の位相を合わせる第一位相合わせ部と、前記連結部材と前記第二回転体との位相を合わせる第二位相合わせ部とを有することを特徴とする駆動伝達装置。 The drive transmission device according to claim 7, wherein
The phase alignment means includes a first phase alignment portion for adjusting the phase of the connection member and the first rotary body in the rotational direction, a second phase alignment portion for adjusting the phase of the connection member and the second rotary body, and A drive transmission device comprising: 請求項８に記載の駆動伝達装置において、
前記第一位相合わせ部および前記第二位相合わせ部の少なくとも一方は、位相合わせに係る挿入部に設けられ、径方向に突出する位相合わせ用突起部と、位相合わせに係る穴部に設けられ、その位相合わせに係る挿入部を前記位相合わせに係る穴部に挿入するときに前記位相合わせ用突起部が挿入される位相合わせ用溝部とで構成され、
前記位相合わせ用突起部の形状を、前記位相合わせに係る挿入部の第一突起部または第二突起部の形状と異ならせ、前記位相合わせ用溝部の形状を、前記位相合わせに係る穴部の第一溝部または第二溝部の形状と異ならせて、前記位相合わせ用突起部を、前記位相合わせ用溝部にのみ挿入可能な構成としたことを特徴とする駆動伝達装置。 The drive transmission device according to claim 8, wherein
At least one of the first phasing portion and the second phasing portion is provided in the insertion portion for phasing, and is provided in the projection for phasing in the radial direction and the hole for phasing , the phase adjustment protrusion is composed of a phase adjustment groove portion to be inserted when inserted into the hole of the insertion portion according to the phase matching in the phase matching,
The shape of the phasing protrusion is made different from the shape of the first protrusion or the second protrusion of the insertion portion relating to the phasing , and the shape of the phasing groove is that of the hole relating to the phasing A drive transmission device characterized in that the phasing projection can be inserted only into the phasing groove, different from the shape of the first groove or the second groove . 請求項８または９に記載の駆動伝達装置において、
前記第一位相合わせ部および前記第二位相合わせ部の少なくとも一方を、位相合わせに係る穴部の底面の回転中心に対してずれた位置に設けた軸方向に突出する凸形状部と、位相合わせに係る挿入部をこの穴部に挿入したときに前記凸形状部と非接触となるように前記位相合わせに係る挿入部に形成された切り欠き部とで構成したことを特徴とする駆動伝達装置。 In the drive transmission device according to claim 8 or 9,
An axially projecting convex portion provided at a position shifted from the center of rotation of the bottom surface of the hole portion related to phase alignment, and at least one of the first phase alignment portion and the second phase alignment portion, and phase alignment The drive transmission device is characterized in that the insertion portion according to the present invention is constituted by the notch portion formed in the insertion portion according to the phasing so as not to be in contact with the convex shaped portion when inserted into the hole portion. . 請求項１乃至１０いずれかに記載の駆動伝達装置において、
前記第一溝部には、前記第一突起部が第一溝部から抜けるのを止める抜け止め部を有し、
前記第一回転体の穴部には、前記第一溝部の形成位置とは、回転方向で異なる位置に開口を有し、軸方向に延びて前記第一挿入部を穴部に挿入するときに、前記第一突起部を穴部内部へ案内する案内溝部と、該案内溝部と前記第一溝部とを連通する連通部とを有し、
前記第一突起部が、前記連通部を通って、前記第一溝部から前記案内溝部へ移動するのを規制する規制手段を設けたことを特徴とする駆動伝達装置。 The drive transmission apparatus according to any one of claims 1 to 10.
The first groove portion has a retaining portion that stops the first protruding portion from slipping out of the first groove portion,
The hole of the first rotary body has an opening at a position different from the position where the first groove is formed in the rotational direction, and extends in the axial direction to insert the first insertion portion into the hole A guide groove for guiding the first protrusion into the hole, and a communication part for communicating the guide groove with the first groove,
A drive transmission device, comprising: a restricting means for restricting the movement of the first projection from the first groove to the guide groove through the communication part. 請求項１乃至１１いずれかに記載の駆動伝達装置において、
前記連結部材は、前記第一回転体に軸方向に移動可能に取り付けられており、
前記連結部材を、前記第二回転体側に向かって付勢する付勢手段を設けたことを特徴とする駆動伝達装置。 The drive transmission apparatus according to any one of claims 1 to 11.
The connecting member is axially movably attached to the first rotating body,
A drive transmission device comprising biasing means for biasing the connecting member toward the second rotating body. 請求項１乃至１２いずれかに記載の駆動伝達装置を備えた画像形成装置。 An image forming apparatus having a drive transmission device according to any one of claims 1 to 12.
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