JP6157294B2 - Driving device and image forming apparatus - Google Patents

Driving device and image forming apparatus Download PDF

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JP6157294B2
JP6157294B2 JP2013191362A JP2013191362A JP6157294B2 JP 6157294 B2 JP6157294 B2 JP 6157294B2 JP 2013191362 A JP2013191362 A JP 2013191362A JP 2013191362 A JP2013191362 A JP 2013191362A JP 6157294 B2 JP6157294 B2 JP 6157294B2
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drive shaft
gear
holding member
control means
drive
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JP2015059950A (en
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加藤 宏
宏 加藤
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Canon Inc
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Description

本発明は、複写機やレーザビームプリンタ等の画像形成装置に設けられる駆動装置に関するものである。   The present invention relates to a driving device provided in an image forming apparatus such as a copying machine or a laser beam printer.

レーザビームプリンタ等の画像形成装置では、高速印刷が進むと同時に多種多様な記録材への高画質印刷も求められている。特にカラーレーザビームプリンタでは、薄紙から光沢紙に至る多種多様な記録材への高画質印刷に対応するために複数の印刷速度モードを使い分けてトナー画像の定着安定性を確保している。   In an image forming apparatus such as a laser beam printer, high-speed printing advances, and at the same time, high-quality printing on a variety of recording materials is required. In particular, in a color laser beam printer, in order to support high-quality printing on a wide variety of recording materials ranging from thin paper to glossy paper, a plurality of printing speed modes are selectively used to ensure toner image fixing stability.

例えば、トナー画像を記録材に定着するための熱量が小さい薄紙や普通紙は高速印刷モードで対応し、トナー画像を記録材に定着するための熱量が大きい厚紙や光沢紙は低速印刷モードで対応しているのが現状である。   For example, thin paper or plain paper with a small amount of heat to fix the toner image on the recording material is compatible with the high-speed printing mode, and thick paper or glossy paper with a large amount of heat to fix the toner image on the recording material is compatible with the low-speed printing mode. This is the current situation.

低速印刷モードを保証するための駆動部は低温環境下でのグリース粘性の上昇や稼動部品の収縮による起動トルク増加を見込む必要がある。それらを加味した上で回転精度を維持できるように回転速度の下限を設定する。   The drive unit for guaranteeing the low-speed printing mode needs to expect an increase in starting torque due to an increase in grease viscosity in a low temperature environment and a contraction of moving parts. The lower limit of the rotation speed is set so that the rotation accuracy can be maintained after taking them into consideration.

また、駆動部自体は、歯車を採用したものが一般的であるが、どの速度モードであっても、所定の減速比で構成されていることが多い。そのため、高速印刷をするためには駆動部の回転速度を上げる。   In general, the drive unit itself employs gears. However, the drive unit is often configured with a predetermined reduction ratio in any speed mode. Therefore, the rotational speed of the drive unit is increased in order to perform high-speed printing.

駆動部が高速回転すると駆動部を構成する歯車の噛み合い音が大きくなり、ユーザにストレスを与える。このようなストレス軽減のために高速印刷と低速印刷を両立する駆動部の低速回転制御が望まれている。   When the drive unit rotates at a high speed, the meshing sound of the gears constituting the drive unit increases, which gives stress to the user. In order to reduce such stress, low-speed rotation control of the drive unit that achieves both high-speed printing and low-speed printing is desired.

例えば、特許文献1、2では速度比の異なる複数の駆動伝達経路を切り替えて駆動部を低速回転させつつ高速印刷と低速印刷とを実行可能な構成が記載されている。   For example, Patent Documents 1 and 2 describe a configuration capable of executing high-speed printing and low-speed printing while switching a plurality of drive transmission paths having different speed ratios and rotating the drive unit at a low speed.

特開2007−017777号公報JP 2007-017777 A 特開2002−120948号公報JP 2002-120948 A

しかしながら、特許文献1、2では、複数の駆動伝達経路に配設される複数の歯車と支持軸が必要であり、駆動部が占めるスペースが大きくなる。また、複数の駆動伝達経路の一つが駆動伝達に用いられると、それ以外の駆動伝達経路に配設された歯車は高速で空転するため騒音悪化を招くといった問題があった。   However, in Patent Documents 1 and 2, a plurality of gears and support shafts arranged in a plurality of drive transmission paths are necessary, and the space occupied by the drive unit becomes large. In addition, when one of the plurality of drive transmission paths is used for drive transmission, the gears disposed in the other drive transmission paths idle at a high speed, resulting in noise deterioration.

本発明は前記課題を解決するものであり、その目的とするところは、駆動部が占めるスペースが小さく、騒音が低減出来る駆動装置を提供するものである。   The present invention solves the above-described problems, and an object of the present invention is to provide a driving device that can reduce noise by occupying a small space occupied by a driving unit.

前記目的を達成するための本発明に係る駆動装置の代表的な構成は、正逆回転可能な駆動源の駆動軸と、前記駆動軸と一体的に回転する太陽歯車と、前記太陽歯車と噛合する少なくとも一つ以上の衛星歯車と、前記衛星歯車の回転軸を支持する保持部材と、前記衛星歯車と噛合する内歯車を有する出力歯車と、前記保持部材と固定部材との間の連結と解除とを制御する第一制御手段と、前記保持部材と前記駆動軸との間の連結と解除とを制御する第二制御手段と、を有し、前記保持部材と、前記太陽歯車と、前記出力歯車と、が前記駆動軸と同一軸線を中心に回転可能に設けられ、前記駆動軸が正回転すると、前記第一制御手段により前記保持部材と前記固定部材との連結が解除され、且つ前記第二制御手段により前記保持部材と前記駆動軸とが連結されて、前記駆動軸と、前記保持部材と、前記太陽歯車と、前記太陽歯車に噛合する前記衛星歯車に前記内歯車が噛合する前記出力歯車と、が一体的に等速度回転し、前記駆動軸が逆回転すると、前記第一制御手段により前記保持部材と前記固定部材とが連結され、且つ前記第二制御手段により前記保持部材と前記駆動軸との連結が解除されて、前記保持部材が固定され、前記駆動軸と、前記太陽歯車とが一体的に等速度回転し、前記太陽歯車に噛合する前記衛星歯車に前記内歯車が噛合する前記出力歯車が前記駆動軸の回転方向とは反対方向に減速回転することを特徴とする。   In order to achieve the above object, a typical configuration of a drive device according to the present invention includes a drive shaft of a drive source capable of rotating forward and reverse, a sun gear rotating integrally with the drive shaft, and meshing with the sun gear. At least one or more satellite gears, a holding member that supports the rotation shaft of the satellite gear, an output gear having an internal gear that meshes with the satellite gear, and a connection and release between the holding member and the fixing member And a second control means for controlling connection and release between the holding member and the drive shaft, the holding member, the sun gear, and the output A gear is rotatably provided around the same axis as the drive shaft, and when the drive shaft rotates forward, the first control means releases the connection between the holding member and the fixing member, and Two holding means and the drive shaft by two control means And the drive shaft, the holding member, the sun gear, and the output gear with which the internal gear meshes with the satellite gear that meshes with the sun gear, rotate integrally at a constant speed, When the drive shaft rotates reversely, the holding member and the fixing member are connected by the first control means, and the connection between the holding member and the drive shaft is released by the second control means, and the holding A member is fixed, the drive shaft and the sun gear rotate integrally at a constant speed, and the output gear with which the internal gear meshes with the satellite gear that meshes with the sun gear has a rotational direction of the drive shaft. Is characterized by rotating at a reduced speed in the opposite direction.

上記構成によれば、駆動源の駆動軸上に変速機構となる太陽歯車と衛星歯車とからなる遊星歯車機構を設ける。これにより、駆動部が占めるスペースを小さくできる。また、駆動軸の正逆回転切り替えによって、最小限の歯車で回転動作を切り替えることが出来、歯車が空転する無駄な動作がなくなり駆動部の低速回転による静音効果が得られる。   According to the above configuration, the planetary gear mechanism including the sun gear and the satellite gear serving as the speed change mechanism is provided on the drive shaft of the drive source. Thereby, the space which a drive part occupies can be made small. In addition, the rotation operation can be switched with a minimum number of gears by switching the forward / reverse rotation of the drive shaft, and a useless operation in which the gears are idled is eliminated, and a silent effect due to the low-speed rotation of the drive unit can be obtained.

本発明に係る駆動装置を備えた画像形成装置の構成を示す断面説明図である。1 is a cross-sectional explanatory diagram illustrating a configuration of an image forming apparatus including a driving device according to the present invention. 本発明に係る駆動装置の第1実施形態の構成を示す斜視説明図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory perspective view illustrating a configuration of a first embodiment of a drive device according to the present invention. 第1実施形態の構成を示す分解斜視図である。It is a disassembled perspective view which shows the structure of 1st Embodiment. (a)は第1実施形態の構成を示す側面説明図、(b)は第1実施形態における正回転時の駆動伝達方向を示す(a)のA−A断面図である。(c)第1実施形態における逆回転時の駆動伝達方向を示す(a)のA−A断面図である。(A) is side explanatory drawing which shows the structure of 1st Embodiment, (b) is AA sectional drawing of (a) which shows the drive transmission direction at the time of forward rotation in 1st Embodiment. (C) It is AA sectional drawing of (a) which shows the drive transmission direction at the time of reverse rotation in 1st Embodiment. 本発明に係る駆動装置の第2実施形態の構成を示す斜視説明図である。It is a perspective explanatory view showing the composition of a 2nd embodiment of the drive concerning the present invention. 第2実施形態の構成を示す分解斜視図である。It is a disassembled perspective view which shows the structure of 2nd Embodiment. (a)は第2実施形態の構成を示す側面説明図、(b)は第2実施形態における正回転時の駆動伝達方向を示す(a)のB−B断面図、(c)は第2実施形態における正回転時の駆動伝達方向を示す(a)のC−C断面図である。(A) is side explanatory drawing which shows the structure of 2nd Embodiment, (b) is a BB sectional drawing of (a) which shows the drive transmission direction at the time of forward rotation in 2nd Embodiment, (c) is 2nd. It is CC sectional drawing of (a) which shows the drive transmission direction at the time of forward rotation in embodiment. (a)は第2実施形態における逆回転時の駆動伝達方向を示す図7(a)のB−B断面図、(b)は第2実施形態における逆回転時の駆動伝達方向を示す図7(a)のC−C断面図である。7A is a cross-sectional view taken along the line BB in FIG. 7A showing the drive transmission direction during reverse rotation in the second embodiment, and FIG. 7B is a diagram showing the drive transmission direction during reverse rotation in the second embodiment. It is CC sectional drawing of (a).

図により本発明に係る駆動装置を備えた画像形成装置の一実施形態を具体的に説明する。   An embodiment of an image forming apparatus provided with a driving device according to the present invention will be specifically described with reference to the drawings.

先ず、図1〜図4を用いて本発明に係る駆動装置を備えた画像形成装置の第1実施形態の構成について説明する。   First, the configuration of a first embodiment of an image forming apparatus provided with a drive device according to the present invention will be described with reference to FIGS.

<画像形成装置>
図1は本発明に係る駆動装置4を備えた画像形成装置1の構成を示す断面説明図である。画像形成装置1の中央部には画像を形成する画像形成手段が設けられている。10y,10m,10c,10bはイエロー、マゼンタ、シアン、ブラックの各色に対応する静電潜像が形成される像担持体となる回転可能な感光ドラムである。尚、説明の都合上、各感光ドラム10y,10m,10c,10bを単に感光ドラム10で代表的に表わす場合もある。他の画像形成プロセス手段に関しても同様である。
<Image forming apparatus>
FIG. 1 is an explanatory cross-sectional view showing a configuration of an image forming apparatus 1 provided with a driving device 4 according to the present invention. An image forming unit for forming an image is provided at the center of the image forming apparatus 1. Reference numerals 10y, 10m, 10c, and 10b denote rotatable photosensitive drums that serve as image carriers on which electrostatic latent images corresponding to yellow, magenta, cyan, and black are formed. For convenience of explanation, the photosensitive drums 10y, 10m, 10c, and 10b may be simply represented by the photosensitive drum 10 as a representative. The same applies to other image forming process means.

更に、各感光ドラム10と対向して配置され、現像剤となるトナーを保持しながら各感光ドラム10にトナーを供給する現像剤担持体となる回転可能な現像ローラ11y,11m,11c,11bが設けられている。本実施形態では、画像を形成する画像形成手段を構成する感光ドラム10及び現像ローラ11が駆動装置4により回転駆動される一例について説明する。   Further, rotatable developing rollers 11y, 11m, 11c, and 11b that are disposed to face the respective photosensitive drums 10 and serve as developer carrying members that supply the toner to the respective photosensitive drums 10 while holding the toner serving as a developer. Is provided. In the present embodiment, an example in which the photosensitive drum 10 and the developing roller 11 constituting the image forming unit for forming an image are rotationally driven by the driving device 4 will be described.

画像形成装置1に設けられた制御手段となる制御部5が印刷信号を受けると、駆動装置4により回転駆動される感光ドラム10の表面は図示しない帯電手段により一様に帯電される。その後、露光手段となる光学ユニット6に設けられたレーザスキャナ部2y,2m,2c,2bが回転する感光ドラム10の表面に画像情報に応じたレーザ光2aを照射する。   When the control unit 5 serving as a control unit provided in the image forming apparatus 1 receives a print signal, the surface of the photosensitive drum 10 that is rotationally driven by the drive unit 4 is uniformly charged by a charging unit (not shown). Thereafter, the surface of the photosensitive drum 10 on which the laser scanner units 2y, 2m, 2c, and 2b provided in the optical unit 6 serving as the exposure unit rotate is irradiated with laser light 2a corresponding to the image information.

レーザ光2aが照射された感光ドラム10の表面は電荷による静電潜像が形成される。駆動装置4により回転駆動される現像ローラ11が回転しながら感光ドラム10の表面上の静電潜像に保持しているトナーを供給する。これにより、感光ドラム10の表面にはトナー画像が形成される。   On the surface of the photosensitive drum 10 irradiated with the laser beam 2a, an electrostatic latent image is formed by electric charges. The developing roller 11 that is rotationally driven by the driving device 4 supplies toner held on the electrostatic latent image on the surface of the photosensitive drum 10 while rotating. As a result, a toner image is formed on the surface of the photosensitive drum 10.

また、駆動ローラ14とテンションローラ7とによって張架された像担持体となる無端状の中間転写ベルト13が感光ドラム10に対向して配置されている。中間転写ベルト13は駆動ローラ14が回転駆動されることによって図1の矢印a方向に搬送される。   In addition, an endless intermediate transfer belt 13 serving as an image carrier stretched by the driving roller 14 and the tension roller 7 is disposed to face the photosensitive drum 10. The intermediate transfer belt 13 is conveyed in the direction of arrow a in FIG. 1 when the driving roller 14 is driven to rotate.

中間転写ベルト13を挟んで感光ドラム10と対向する位置には回転可能な一次転写手段となる一次転写ローラ12y,12m,12c,12bが設けられている。感光ドラム10の表面に形成されたトナー画像は一次転写ローラ12に印加される一次転写バイアス電圧により中間転写ベルト13の外周面上に一次転写される。更に、中間転写ベルト13の外周面上に一次転写されたトナー画像は駆動ローラ14の回転により二次転写手段となる二次転写ローラ15が対向する二次転写ニップ部へと搬送される。   Primary transfer rollers 12y, 12m, 12c, and 12b serving as rotatable primary transfer means are provided at positions facing the photosensitive drum 10 with the intermediate transfer belt 13 interposed therebetween. The toner image formed on the surface of the photosensitive drum 10 is primarily transferred onto the outer peripheral surface of the intermediate transfer belt 13 by a primary transfer bias voltage applied to the primary transfer roller 12. Further, the toner image primarily transferred onto the outer peripheral surface of the intermediate transfer belt 13 is conveyed to the secondary transfer nip portion opposed to the secondary transfer roller 15 serving as a secondary transfer unit by the rotation of the driving roller 14.

一方、記録材収納部30に収納された記録材8はピックアップローラ31により繰り出され、分離部32により1枚ずつに分離されて図1の矢印b方向に給送されてレジストローラ40まで搬送される。レジストローラ40は中間転写ベルト13の外周面上のトナー画像と、記録材8の先端位置とを合わせるように記録材8を二次転写ローラ15が対向する二次転写ニップ部へと搬送する。   On the other hand, the recording material 8 stored in the recording material storage unit 30 is fed out by the pickup roller 31, separated one by one by the separation unit 32, fed in the direction of arrow b in FIG. 1, and conveyed to the registration roller 40. The The registration roller 40 conveys the recording material 8 to the secondary transfer nip portion opposed to the secondary transfer roller 15 so that the toner image on the outer peripheral surface of the intermediate transfer belt 13 and the tip position of the recording material 8 are aligned.

二次転写ローラ15が対向する二次転写ニップ部へと搬送された中間転写ベルト13の外周面上のトナー画像は二次転写ローラ15に印加される二次転写バイアス電圧と圧力とによって記録材8に二次転写される。トナー画像が二次転写された記録材8は中間転写ベルト13と二次転写ローラ15とにより挟持搬送される過程で中間転写ベルト13から分離されて定着手段となる定着装置50に搬送される。   The toner image on the outer peripheral surface of the intermediate transfer belt 13 conveyed to the secondary transfer nip portion opposed to the secondary transfer roller 15 is recorded on the recording material by the secondary transfer bias voltage and pressure applied to the secondary transfer roller 15. Secondary transfer to No.8. The recording material 8 on which the toner image has been secondarily transferred is separated from the intermediate transfer belt 13 and conveyed to a fixing device 50 serving as a fixing unit in the process of being nipped and conveyed by the intermediate transfer belt 13 and the secondary transfer roller 15.

定着装置50では、回転可能な加熱回転体となる加熱ローラ51からの熱と、加熱ローラ51と対向して回転可能な加圧回転体となる加圧ローラ52により付与される圧力とによりトナー画像を記録材8に定着させる。トナー画像が定着された記録材8は排出回転体となる排出ローラ60により搬送され、画像形成装置1に設けられた排出積載部70に積載される。   In the fixing device 50, the toner image is generated by the heat from the heating roller 51 serving as a rotatable heating rotator and the pressure applied by the pressure roller 52 serving as a pressing rotator that can rotate opposite to the heating roller 51. Is fixed to the recording material 8. The recording material 8 on which the toner image is fixed is conveyed by a discharge roller 60 serving as a discharge rotating body, and is stacked on a discharge stacking unit 70 provided in the image forming apparatus 1.

<駆動装置>
図2は感光ドラム10と現像ローラ11を駆動する駆動装置4の構成を示す斜視説明図である。図3は駆動装置4の分解斜視図である。尚、各色とも駆動構成は同一であるため一色のみの駆動装置4について説明する。
<Drive device>
FIG. 2 is an explanatory perspective view showing the configuration of the driving device 4 for driving the photosensitive drum 10 and the developing roller 11. FIG. 3 is an exploded perspective view of the driving device 4. Since the drive configuration is the same for each color, the drive device 4 for only one color will be described.

図2及び図3において、制御部5により制御されて正逆回転可能な駆動源となるモータ80の駆動軸80b上に変速機構となる遊星歯車機構9を備えた出力歯車81が設けられている。出力歯車81は小径円筒部の外周面に設けられた外歯車81cに噛合する二段歯車82を介して感光ドラム10を回転駆動する感光ドラム駆動歯車83に回転駆動力を伝達する。   2 and 3, an output gear 81 including a planetary gear mechanism 9 serving as a speed change mechanism is provided on a drive shaft 80b of a motor 80 serving as a drive source that can be rotated forward and backward by being controlled by the control unit 5. . The output gear 81 transmits the rotational driving force to the photosensitive drum driving gear 83 that rotationally drives the photosensitive drum 10 through a two-stage gear 82 that meshes with an external gear 81c provided on the outer peripheral surface of the small diameter cylindrical portion.

感光ドラム10が図2の矢印c1方向に装着されると、感光ドラム10の一端に設けられた継ぎ手部10aが感光ドラム駆動歯車83の軸方向の一端に設けられた継ぎ手部83aと噛合する。そして、モータ80の駆動軸80bから出力歯車81、二段歯車82を介して感光ドラム駆動歯車83に伝達された回転駆動力により感光ドラム10は図2の矢印d方向に回転する。   When the photosensitive drum 10 is mounted in the direction of the arrow c 1 in FIG. 2, the joint portion 10 a provided at one end of the photosensitive drum 10 meshes with the joint portion 83 a provided at one end in the axial direction of the photosensitive drum driving gear 83. The photosensitive drum 10 is rotated in the direction of arrow d in FIG. 2 by the rotational driving force transmitted from the driving shaft 80b of the motor 80 to the photosensitive drum driving gear 83 via the output gear 81 and the two-stage gear 82.

出力歯車81の小径円筒部の外周面に設けられた外歯車81cは二段歯車84とも噛合しており、中間歯車85を介して現像ローラ11を回転駆動する現像ローラ駆動歯車86に回転駆動力を伝達する。現像ローラ11が図2の矢印c2方向に装着されると、現像ローラ11の一端に設けられた継ぎ手部11aが現像ローラ駆動歯車86の軸方向の一端に設けられた継ぎ手部86aと噛合する。そして、モータ80の駆動軸80bから出力歯車81、二段歯車84、中間歯車85を介して現像ローラ駆動歯車86に伝達された回転駆動力により現像ローラ11は図2の矢印e方向に回転する。   The external gear 81c provided on the outer peripheral surface of the small-diameter cylindrical portion of the output gear 81 is also meshed with the two-stage gear 84, and the rotational driving force is applied to the developing roller driving gear 86 that rotationally drives the developing roller 11 via the intermediate gear 85. To communicate. When the developing roller 11 is mounted in the direction of the arrow c2 in FIG. 2, the joint portion 11a provided at one end of the developing roller 11 meshes with the joint portion 86a provided at one end in the axial direction of the developing roller drive gear 86. The developing roller 11 rotates in the direction of arrow e in FIG. 2 by the rotational driving force transmitted from the driving shaft 80b of the motor 80 to the developing roller driving gear 86 via the output gear 81, the two-stage gear 84, and the intermediate gear 85. .

図3はモータ80と出力歯車81との間に減速機構として設けられた遊星歯車機構9の構成を示す分解斜視図である。本実施形態の遊星歯車機構9はモータ80の駆動軸80bと一体的に回転する太陽歯車90を中心として4つの衛星歯車92が自転しつつ公転する。尚、衛星歯車92は少なくとも一つ以上有れば良い。   FIG. 3 is an exploded perspective view showing the configuration of the planetary gear mechanism 9 provided as a speed reduction mechanism between the motor 80 and the output gear 81. In the planetary gear mechanism 9 of this embodiment, four satellite gears 92 revolve around the sun gear 90 that rotates integrally with the drive shaft 80b of the motor 80 while rotating. Note that at least one satellite gear 92 is sufficient.

尚、図3では、説明の都合上、各部材の一部を切り欠いて断面を示したものである。円盤状の保持部材93の一方の面(図3の右側の面)には4つの衛星歯車92の各回転軸3が突出した状態で支持されている。また、保持部材93の他方の面(図3の左側の面)にはモータ80の駆動軸80bに嵌合して取り付けられる第二制御手段となるワンウェイクラッチ93bが設けられている。ワンウェイクラッチ93bは保持部材93と、モータ80の駆動軸80bとの間の連結と解除とを回転方向に応じて制御する。   In FIG. 3, for convenience of explanation, a part of each member is cut away to show a cross section. The rotating shafts 3 of the four satellite gears 92 are supported in a protruding state on one surface of the disk-shaped holding member 93 (the right surface in FIG. 3). Further, a one-way clutch 93b serving as second control means that is fitted and attached to the drive shaft 80b of the motor 80 is provided on the other surface (the left surface in FIG. 3) of the holding member 93. The one-way clutch 93b controls connection and release between the holding member 93 and the drive shaft 80b of the motor 80 according to the rotation direction.

本実施形態では、モータ80の駆動軸80bが図4(b)の矢印f方向に正回転すると、ワンウェイクラッチ93bにより保持部材93と駆動軸80bとが連結され、保持部材93は駆動軸80bと一体的に等速度で図4(b)の矢印g方向に正回転する。また、モータ80の駆動軸80bが図4(c)の矢印i方向に逆回転すると、ワンウェイクラッチ93bが空転して保持部材93と駆動軸80bとの連結が解除され、保持部材93は駆動軸80bに対して空転する。   In this embodiment, when the drive shaft 80b of the motor 80 rotates forward in the direction of arrow f in FIG. 4B, the holding member 93 and the drive shaft 80b are connected by the one-way clutch 93b, and the holding member 93 is connected to the drive shaft 80b. It rotates positively in the direction of arrow g in FIG. When the drive shaft 80b of the motor 80 rotates reversely in the direction of arrow i in FIG. 4C, the one-way clutch 93b idles and the connection between the holding member 93 and the drive shaft 80b is released. Idle against 80b.

モータ80が固定された装置フレームの一部からなる固定部材となる駆動側板78には、該駆動側板78に固定されたクラッチベース94に嵌合して取り付けられる第一制御手段となるワンウェイクラッチ95が設けられている。ワンウェイクラッチ95は保持部材93と固定部材となる駆動側板78との間の連結と解除とを回転方向に応じて制御する。   A one-way clutch 95 serving as a first control means fitted to and attached to a clutch base 94 fixed to the drive side plate 78 is attached to a drive side plate 78 which is a fixing member formed of a part of the apparatus frame to which the motor 80 is fixed. Is provided. The one-way clutch 95 controls connection and release between the holding member 93 and the driving side plate 78 serving as a fixing member according to the rotation direction.

本実施形態では、モータ80の駆動軸80bが図4(b)矢印f方向に正回転すると、ワンウェイクラッチ95が空転して保持部材93と、固定部材となる駆動側板78との間の連結が解除され、保持部材93は回転可能な状態となる。また、モータ80の駆動軸80bが図4(c)の矢印i方向に逆回転すると、ワンウェイクラッチ95により保持部材93と、固定部材となる駆動側板78とが連結されて保持部材93が固定され、保持部材93は回転不可能な状態で静止する。   In the present embodiment, when the drive shaft 80b of the motor 80 rotates forward in the direction of arrow f in FIG. 4 (b), the one-way clutch 95 is idled and the connection between the holding member 93 and the drive side plate 78 serving as a fixed member is established. The holding member 93 is released and is in a rotatable state. When the drive shaft 80b of the motor 80 rotates reversely in the direction of arrow i in FIG. 4C, the holding member 93 and the driving side plate 78 serving as a fixing member are connected by the one-way clutch 95 to fix the holding member 93. The holding member 93 is stationary in a non-rotatable state.

ワンウェイクラッチ93bと、ワンウェイクラッチ95とは、互いに異なる回転方向で、保持部材93と、モータ80の駆動軸80bとを連結し、保持部材93と、固定部材となる駆動側板78との間の連結と解除とを選択的に行う。   The one-way clutch 93b and the one-way clutch 95 connect the holding member 93 and the drive shaft 80b of the motor 80 in different rotational directions, and connect between the holding member 93 and the driving side plate 78 serving as a fixed member. And release selectively.

保持部材93、ワンウェイクラッチ93b、太陽歯車90及び出力歯車81は、それぞれの中央部に設けられた貫通穴を介してモータ80の駆動軸80bに挿通される。これにより保持部材93、太陽歯車90及び出力歯車81がモータ80の駆動軸80bと同一軸線16を中心に回転可能に設けられている。   The holding member 93, the one-way clutch 93b, the sun gear 90, and the output gear 81 are inserted into the drive shaft 80b of the motor 80 through through holes provided in the respective central portions. Accordingly, the holding member 93, the sun gear 90, and the output gear 81 are provided to be rotatable about the same axis 16 as the drive shaft 80b of the motor 80.

太陽歯車90はモータ80の駆動軸80bに設けられた穴80aに挿入される固定ピン91によって駆動軸80bに固定されており該駆動軸80bと一体的に等速度で回転する。4つの衛星歯車92は保持部材93に突設された4つの回転軸3に対してそれぞれ回転自在に嵌合されており、それぞれの衛星歯車92が太陽歯車90を中心として該太陽歯車90と噛合する。各衛星歯車92は、回転軸3を中心にそれぞれ自転しながら太陽歯車90を中心として公転する。   The sun gear 90 is fixed to the drive shaft 80b by a fixing pin 91 inserted into a hole 80a provided in the drive shaft 80b of the motor 80, and rotates integrally with the drive shaft 80b at a constant speed. The four satellite gears 92 are rotatably fitted to the four rotary shafts 3 protruding from the holding member 93, and each satellite gear 92 meshes with the sun gear 90 around the sun gear 90. To do. Each satellite gear 92 revolves around the sun gear 90 while rotating around the rotating shaft 3.

出力歯車81は断面コ字形状の大径円筒部を有し、その内周面に内歯車81aが設けられている。出力歯車81の内歯車81aは4つの衛星歯車92とそれぞれ噛合されている。出力歯車81の中央部に設けられた貫通穴には軸受部材となるベアリング81bが圧入して設けられており、出力歯車81はベアリング81bを介して駆動軸80bに対して回転自在に嵌合されている。   The output gear 81 has a large-diameter cylindrical portion having a U-shaped cross section, and an internal gear 81a is provided on the inner peripheral surface thereof. The internal gear 81a of the output gear 81 is meshed with the four satellite gears 92, respectively. A bearing 81b serving as a bearing member is press-fitted into a through hole provided at the center of the output gear 81, and the output gear 81 is rotatably fitted to the drive shaft 80b via the bearing 81b. ing.

出力歯車81のベアリング81bが設けられた小径円筒部の外周面には外歯車81cが設けられており、図2に示すように、該外歯車81cに噛合する二段歯車82,84にそれぞれモータ80の駆動軸80bの回転駆動力が伝達される。   An external gear 81c is provided on the outer peripheral surface of the small-diameter cylindrical portion provided with the bearing 81b of the output gear 81. As shown in FIG. 2, motors are respectively connected to the two-stage gears 82 and 84 meshing with the external gear 81c. The rotational driving force of 80 drive shafts 80b is transmitted.

図4(b)はモータ80の駆動軸80bが図4(b)の矢印f方向に正回転した場合の出力歯車81の回転動作を示す。尚、図4(b),(c)に示す各歯車の外形は歯車のかみ合う位置となるピッチ円(Pitch circle)で示す。モータ80の駆動軸80bが図4(b)の矢印f方向に正回転すると、該駆動軸80bに固定された太陽歯車90は、該駆動軸80bと一体的に等速度で図4(b)の矢印f方向に正回転する。   FIG. 4B shows the rotation operation of the output gear 81 when the drive shaft 80b of the motor 80 rotates forward in the direction of arrow f in FIG. 4B. In addition, the external shape of each gear shown in FIGS. 4B and 4C is indicated by a pitch circle which is a position where the gear meshes. When the drive shaft 80b of the motor 80 rotates positively in the direction of arrow f in FIG. 4B, the sun gear 90 fixed to the drive shaft 80b is integrated with the drive shaft 80b at a constant speed in FIG. 4B. In the direction of arrow f.

また、図3に示すワンウェイクラッチ93bがモータ80の駆動軸80bに連結し、保持部材93は、ワンウェイクラッチ93bを介してモータ80の駆動軸80bと一体的に等速度で図4(b)の矢印g方向に正回転する。   Also, the one-way clutch 93b shown in FIG. 3 is connected to the drive shaft 80b of the motor 80, and the holding member 93 is integrated with the drive shaft 80b of the motor 80 through the one-way clutch 93b at the same speed as shown in FIG. It rotates forward in the direction of arrow g.

保持部材93と太陽歯車90とがモータ80の駆動軸80bと一体的に等速度で図4(b)の矢印f,g方向に正回転するため衛星歯車92は静止した状態で該駆動軸80bを中心に図4(b)の矢印g方向(正回転方向)に公転する。衛星歯車92は保持部材93に設けられた回転軸3を中心に自転しないので出力歯車81の内周面に設けられた内歯車81aはモータ80の駆動軸80bと一体的に等速度で図4(b)の矢印h方向に正回転する。   Since the holding member 93 and the sun gear 90 rotate forward in the directions of arrows f and g in FIG. 4B at a constant speed integrally with the drive shaft 80b of the motor 80, the satellite gear 92 is stationary and the drive shaft 80b is stationary. Is revolved in the direction of the arrow g (forward rotation direction) in FIG. Since the satellite gear 92 does not rotate around the rotation shaft 3 provided on the holding member 93, the internal gear 81a provided on the inner peripheral surface of the output gear 81 is integrated with the drive shaft 80b of the motor 80 at a constant speed. It rotates forward in the direction of arrow h in (b).

即ち、本実施形態では、モータ80の駆動軸80bが図4(b)の矢印f方向に正回転すると、図3に示すワンウェイクラッチ95が空転して保持部材93と固定部材となる駆動側板78との連結が解除される。更に、図3に示すワンウェイクラッチ93bにより保持部材93とモータ80の駆動軸80bとが連結される。   That is, in this embodiment, when the drive shaft 80b of the motor 80 is rotated forward in the direction of the arrow f in FIG. 4B, the one-way clutch 95 shown in FIG. Is disconnected. Further, the holding member 93 and the drive shaft 80b of the motor 80 are connected by the one-way clutch 93b shown in FIG.

これによりモータ80の駆動軸80bと、保持部材93と、モータ80の駆動軸80bに固定された太陽歯車90と、該太陽歯車90に噛合する衛星歯車92に内歯車81aが噛合する出力歯車81とが一体的に等速度で正回転する。これらは図4(b)の矢印f,g,h方向に等速度で正回転(等速度回転)する。   As a result, the drive shaft 80b of the motor 80, the holding member 93, the sun gear 90 fixed to the drive shaft 80b of the motor 80, and the output gear 81 in which the internal gear 81a meshes with the satellite gear 92 meshed with the sun gear 90. And rotate integrally at a constant speed. These rotate in the forward direction (constant speed rotation) at a constant speed in the directions of arrows f, g, and h in FIG.

図4(c)はモータ80の駆動軸80bが図4(c)の矢印i方向に逆回転した場合の出力歯車81の回転動作を示す。モータ80の駆動軸80bが図4(c)の矢印i方向に逆回転すると、該駆動軸80bに固定された太陽歯車90は、該駆動軸80bと一体的に等速度で図4(c)の矢印i方向に逆回転する。   FIG. 4C shows the rotation operation of the output gear 81 when the drive shaft 80b of the motor 80 rotates in the reverse direction of the arrow i in FIG. 4C. When the drive shaft 80b of the motor 80 reversely rotates in the direction of arrow i in FIG. 4C, the sun gear 90 fixed to the drive shaft 80b is integrated with the drive shaft 80b at a constant speed in FIG. 4C. Reversely rotate in the direction of arrow i.

一方、保持部材93は図3に示すワンウェイクラッチ95の作用により固定部材となる駆動側板78との間で連結されて固定され、回転不能となって静止する。また、図3に示すワンウェイクラッチ93bは空転し、固定された保持部材93に対してモータ80の駆動軸80bは、図4(c)の矢印i方向に逆回転自在とされる。   On the other hand, the holding member 93 is connected and fixed between the driving side plate 78 as a fixing member by the action of the one-way clutch 95 shown in FIG. Further, the one-way clutch 93b shown in FIG. 3 is idled, and the drive shaft 80b of the motor 80 is rotatable in the reverse direction in the direction of arrow i in FIG. 4C with respect to the fixed holding member 93.

そのため、ワンウェイクラッチ95の作用により固定されて静止している保持部材93の回転軸3に回転自在に軸支された衛星歯車92はモータ80の駆動軸80bを中心に公転しない。更に、衛星歯車92はモータ80の駆動軸80bと一体的に図4(c)の矢印i方向に逆回転する太陽歯車90に噛合しながら回転軸3を中心に図4(c)の矢印j方向に自転する。そして、衛星歯車92に噛合する出力歯車81の内周面に設けられた内歯車81aは図4(c)の矢印k方向に正回転する。   Therefore, the satellite gear 92 rotatably supported by the rotary shaft 3 of the holding member 93 fixed and stationary by the action of the one-way clutch 95 does not revolve around the drive shaft 80 b of the motor 80. Further, the satellite gear 92 meshes with the sun gear 90 that rotates in the direction of arrow i in FIG. 4C integrally with the drive shaft 80b of the motor 80, and the arrow j in FIG. Rotate in the direction. Then, the internal gear 81a provided on the inner peripheral surface of the output gear 81 meshing with the satellite gear 92 rotates forward in the direction of the arrow k in FIG.

即ち、本実施形態では、モータ80の駆動軸80bが図4(c)の矢印i方向に逆回転すると、図3に示すワンウェイクラッチ95により保持部材93と固定部材となる駆動側板78とが連結される。これにより、保持部材93が回転不能に固定される。更に、図3に示すワンウェイクラッチ93bが空転して保持部材93とモータ80の駆動軸80bとの連結が解除される。これによりモータ80の駆動軸80bと、該駆動軸80bに固定された太陽歯車90とが一体的に図4(c)の矢印i方向に等速度で逆回転(等速度回転)する。   That is, in this embodiment, when the drive shaft 80b of the motor 80 rotates in the reverse direction of the arrow i in FIG. 4C, the holding member 93 and the drive side plate 78 serving as the fixed member are connected by the one-way clutch 95 shown in FIG. Is done. Thereby, the holding member 93 is fixed so as not to rotate. Further, the one-way clutch 93b shown in FIG. 3 idles and the connection between the holding member 93 and the drive shaft 80b of the motor 80 is released. As a result, the drive shaft 80b of the motor 80 and the sun gear 90 fixed to the drive shaft 80b are integrally rotated in reverse (constant speed rotation) in the direction of arrow i in FIG.

そして、モータ80の駆動軸80bと一体的に図4(c)の矢印i方向に逆回転する太陽歯車90に噛合する衛星歯車92に内歯車81aが噛合する出力歯車81が図4(c)の矢印k方向に正回転で減速回転する。出力歯車81は図4(c)の矢印i方向に逆回転するモータ80の駆動軸80bの回転方向とは反対方向となる図4(c)の矢印k方向に正回転する。   An output gear 81 in which an internal gear 81a meshes with a satellite gear 92 that meshes with a sun gear 90 that rotates in the direction of arrow i in FIG. 4 (c) integrally with the drive shaft 80b of the motor 80 is shown in FIG. 4 (c). The motor rotates at a reduced speed in the direction of arrow k. The output gear 81 rotates in the forward direction in the direction of the arrow k in FIG. 4C, which is the direction opposite to the direction of rotation of the drive shaft 80b of the motor 80 that rotates in the reverse direction in the direction of arrow i in FIG.

モータ80の駆動軸80bに対する出力歯車81の減速比は、太陽歯車90の歯数と、内歯車81aの歯数との比により決定される。本実施形態の太陽歯車90と出力歯車81との減速比を「K/I」とすると、太陽歯車90の歯数と、内歯車81aの歯数とを用いて以下の数1式により示される。尚、以下の数1式における「−」符号は、回転方向の反転を意味する。   The reduction ratio of the output gear 81 to the drive shaft 80b of the motor 80 is determined by the ratio between the number of teeth of the sun gear 90 and the number of teeth of the internal gear 81a. Assuming that the reduction ratio between the sun gear 90 and the output gear 81 of the present embodiment is “K / I”, the number of teeth of the sun gear 90 and the number of teeth of the internal gear 81a are used and expressed by the following equation (1). . In addition, the "-" code | symbol in the following Numerical formula 1 means the inversion of a rotation direction.

Figure 0006157294
Figure 0006157294

本実施形態では、モータ80の駆動軸80bの正逆回転の切り替えによって、出力歯車81は、モータ80の駆動軸80bの回転方向が異なっても常に一定の方向に回転する。そして、モータ80の駆動軸80bが正回転であればモータ80の駆動軸80bと出力歯車81とは等速度で正回転する。そして、モータ80の駆動軸80bが逆回転であればモータ80の駆動軸80bに対して出力歯車81は、前記数1式で示される「K/I」の減速比で正回転で減速回転する。そして、出力歯車81の小径円筒部の外周面に設けられた外歯車81cに噛合される後続の二段歯車82,84に回転駆動力を伝達する。   In the present embodiment, the output gear 81 always rotates in a constant direction even when the rotation direction of the drive shaft 80b of the motor 80 is different by switching the forward / reverse rotation of the drive shaft 80b of the motor 80. If the drive shaft 80b of the motor 80 is forwardly rotated, the drive shaft 80b of the motor 80 and the output gear 81 are forwardly rotated at a constant speed. If the drive shaft 80b of the motor 80 is reversely rotated, the output gear 81 is decelerated and rotated forward with a reduction ratio of “K / I” expressed by the above equation 1 with respect to the drive shaft 80b of the motor 80. . Then, the rotational driving force is transmitted to the subsequent two-stage gears 82 and 84 meshed with the external gear 81c provided on the outer peripheral surface of the small diameter cylindrical portion of the output gear 81.

尚、ワンウェイクラッチ93b,95は、ニードル方式、ラチェット方式、巻きバネの巻き付き力を利用したバネクラッチ方式等、一方向回転制御可能なものであれば公知の制御手段が適用可能である。   As the one-way clutches 93b and 95, known control means can be applied as long as one-way rotation control is possible, such as a needle method, a ratchet method, and a spring clutch method using a winding force of a winding spring.

これにより、複数の印刷速度モード(高速印刷モード、低速印刷モード)において、駆動部の適正な低速回転速度を維持し、歯車の噛み合い音等の低減効果を得ることが出来る。また、モータ80の駆動軸80b上に変速機構となる遊星歯車機構9及び変速機構の一部を構成する出力歯車81を設けることにより、入出力間のアライメント精度を維持し易く、作像系駆動部に要求される駆動伝達精度を維持し易い。したがって、小型化、静音化、高速化、高画質印刷を実現する高速レーザビームプリンタの駆動部として適用可能である。   Thereby, in a plurality of printing speed modes (high-speed printing mode, low-speed printing mode), it is possible to maintain an appropriate low-speed rotation speed of the drive unit and obtain an effect of reducing gear meshing noise and the like. Further, by providing the planetary gear mechanism 9 as a speed change mechanism and the output gear 81 constituting a part of the speed change mechanism on the drive shaft 80b of the motor 80, it is easy to maintain the alignment accuracy between the input and output, and drive the image forming system. It is easy to maintain the drive transmission accuracy required for the part. Therefore, it can be applied as a drive unit of a high-speed laser beam printer that realizes miniaturization, quietness, high speed, and high quality printing.

また、本実施形態では、図3に示すように、出力歯車81の軸方向の一端側が略閉塞された大径円筒部の内周面に設けた内歯車81aの内部に太陽歯車90と衛星歯車92とが収容され、その開口側を円盤状の保持部材93によって覆う構成である。このため内歯車81aの内部で発生する歯車の噛み合い音を遮音することが出来る。   Further, in the present embodiment, as shown in FIG. 3, the sun gear 90 and the satellite gear 90 are provided inside an internal gear 81a provided on the inner peripheral surface of the large diameter cylindrical portion in which one end side in the axial direction of the output gear 81 is substantially closed. 92, and the opening side thereof is covered with a disk-shaped holding member 93. For this reason, the meshing sound of the gear generated inside the internal gear 81a can be insulated.

次に、図5〜図8を用いて本発明に係る駆動装置を備えた画像形成装置の第2実施形態の構成について説明する。尚、前記第1実施形態と同様に構成したものは同一の符号、或いは符号が異なっても同一の部材名を付して説明を省略する。   Next, the configuration of the second embodiment of the image forming apparatus including the driving device according to the present invention will be described with reference to FIGS. In addition, what was comprised similarly to the said 1st Embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description.

前記第1実施形態では、図3に示すように、保持部材93とモータ80の駆動軸80bとの間の連結と解除とを制御する第二制御手段としてワンウェイクラッチ93bを設けた。本実施形態では、図6に示すように、ワンウェイクラッチ93bの代わりに、出力歯車81とモータ80の駆動軸80bとの間の連結と解除とを制御する第三制御手段としてワンウェイクラッチ81dを設けた。   In the first embodiment, as shown in FIG. 3, the one-way clutch 93b is provided as the second control means for controlling the connection and release between the holding member 93 and the drive shaft 80b of the motor 80. In this embodiment, as shown in FIG. 6, instead of the one-way clutch 93b, a one-way clutch 81d is provided as a third control means for controlling the connection and release between the output gear 81 and the drive shaft 80b of the motor 80. It was.

図5は画像形成手段を構成する感光ドラム10と現像ローラ11とを駆動する本実施形態の駆動装置4の構成を示す。感光ドラム10と現像ローラ11との駆動については、図2を用いて前述した駆動動作と同様であるため重複する説明は省略する。   FIG. 5 shows the configuration of the driving device 4 of this embodiment for driving the photosensitive drum 10 and the developing roller 11 constituting the image forming means. The driving of the photosensitive drum 10 and the developing roller 11 is the same as the driving operation described above with reference to FIG.

図6はモータ80の駆動軸80bと、出力歯車81との間に設けられる遊星歯車機構9の構成を示す。尚、図6は説明上、各部材の一部を切り欠いて断面を示す。図6に示すように、モータ80の駆動軸80bに嵌合する保持部材93は固定部材となる駆動側板78に固定されたクラッチベース94に嵌合する第一制御手段となるワンウェイクラッチ95を備えている。   FIG. 6 shows the configuration of the planetary gear mechanism 9 provided between the drive shaft 80 b of the motor 80 and the output gear 81. In addition, FIG. 6 shows a cross section by notching a part of each member for explanation. As shown in FIG. 6, the holding member 93 fitted to the drive shaft 80b of the motor 80 includes a one-way clutch 95 serving as a first control means fitted to a clutch base 94 fixed to a drive side plate 78 serving as a fixed member. ing.

太陽歯車90はモータ80の駆動軸80bに設けられた穴80aに挿入される固定ピン91によって駆動軸80bに固定され、該駆動軸80bと一体的に等速度回転する。4つの衛星歯車92は保持部材93に設けられたそれぞれの回転軸3に回転自在に嵌合し、太陽歯車90と噛合されている。   The sun gear 90 is fixed to the drive shaft 80b by a fixing pin 91 inserted into a hole 80a provided in the drive shaft 80b of the motor 80, and rotates at a constant speed integrally with the drive shaft 80b. The four satellite gears 92 are rotatably fitted to the respective rotary shafts 3 provided on the holding member 93 and meshed with the sun gear 90.

出力歯車81は大径円筒部を有し、その大径円筒部の内周面には4つの衛星歯車92とそれぞれ噛合する内歯車81aが設けられている。また、出力歯車81の中央部に設けられた貫通穴の内壁面にはモータ80の駆動軸80bに嵌合する第三制御手段となるワンウェイクラッチ81dと、出力歯車81の中央部に設けられた貫通穴に圧入された軸受部材となるベアリング81bが設けられている。   The output gear 81 has a large-diameter cylindrical portion, and an internal gear 81a that meshes with each of the four satellite gears 92 is provided on the inner peripheral surface of the large-diameter cylindrical portion. Further, a one-way clutch 81d serving as a third control means fitted to the drive shaft 80b of the motor 80 is provided on the inner wall surface of the through hole provided in the central portion of the output gear 81, and provided in the central portion of the output gear 81. A bearing 81b serving as a bearing member press-fitted into the through hole is provided.

出力歯車81のベアリング81bが設けられた小径円筒部の外周面には外歯車81cが設けられており、図6に示すように、該外歯車81cに噛合する二段歯車82,84にモータ80の駆動軸80bの回転駆動力が伝達される。   An external gear 81c is provided on the outer peripheral surface of the small diameter cylindrical portion provided with the bearing 81b of the output gear 81. As shown in FIG. 6, a motor 80 is connected to the two-stage gears 82 and 84 meshing with the external gear 81c. The rotational driving force of the driving shaft 80b is transmitted.

図7(b),(c)はモータ80の駆動軸80bが正回転した場合の出力歯車81の回転動作を示す。尚、図7(b),(c)及び図8(a),(b)に示す各歯車の外形は歯車のかみ合う位置となるピッチ円(Pitch circle)で示す。モータ80の駆動軸80bが図7(b),(c)の矢印r方向に正回転すると、図6及び図7(a),(b)に示すワンウェイクラッチ81dが該駆動軸80bに連結する。これにより、ワンウェイクラッチ81dによりモータ80の駆動軸80bに連結された出力歯車81と、モータ80の駆動軸80bに固定された太陽歯車90とは、モータ80の駆動軸80bと一体的に等速度で図7(b),(c)の矢印r方向に正回転する。   7B and 7C show the rotation operation of the output gear 81 when the drive shaft 80b of the motor 80 rotates forward. The outer shapes of the gears shown in FIGS. 7B and 7C and FIGS. 8A and 8B are indicated by pitch circles where the gears mesh. When the drive shaft 80b of the motor 80 rotates forward in the direction of the arrow r in FIGS. 7B and 7C, the one-way clutch 81d shown in FIGS. 6, 7A and 7B is connected to the drive shaft 80b. . As a result, the output gear 81 connected to the drive shaft 80b of the motor 80 by the one-way clutch 81d and the sun gear 90 fixed to the drive shaft 80b of the motor 80 are integrated at a constant speed with the drive shaft 80b of the motor 80. As shown in FIGS. 7B and 7C, it rotates in the direction of the arrow r.

一方、第一制御手段となるワンウェイクラッチ95は空転して保持部材93と、固定部材となる駆動側板78との間の連結は解除されている。出力歯車81と太陽歯車90とはモータ80の駆動軸80bと一体的に等速度で図7(b),(c)の矢印r方向に正回転する。このため出力歯車81と太陽歯車90とは回転位相が同じとなる。そして、保持部材93の回転軸3にそれぞれ回転自在に軸支された衛星歯車92は自転しないで静止する。そして、衛星歯車92は保持部材93と一体的にモータ80の駆動軸80bを中心に図7(c)の矢印m方向に公転(正回転)する。   On the other hand, the one-way clutch 95 serving as the first control means idles and the connection between the holding member 93 and the driving side plate 78 serving as the fixed member is released. The output gear 81 and the sun gear 90 rotate positively in the direction of the arrow r in FIGS. 7B and 7C at a constant speed integrally with the drive shaft 80b of the motor 80. For this reason, the output gear 81 and the sun gear 90 have the same rotational phase. Then, the satellite gears 92 rotatably supported on the rotation shaft 3 of the holding member 93 are stationary without rotating. The satellite gear 92 revolves (normally rotates) integrally with the holding member 93 in the direction of the arrow m in FIG. 7C around the drive shaft 80b of the motor 80.

即ち、モータ80の駆動軸80bが図7(b),(c)の矢印r方向に正回転すると、第一制御手段となるワンウェイクラッチ95が空転して保持部材93と固定部材となる駆動側板78との間の連結が解除される。   That is, when the drive shaft 80b of the motor 80 rotates forward in the direction of the arrow r in FIGS. 7B and 7C, the one-way clutch 95 serving as the first control means idles and the drive side plate serving as the holding member 93 and the fixed member. The connection with 78 is released.

更に、第三制御手段となるワンウェイクラッチ81dにより出力歯車81と、モータ80の駆動軸80bとが連結される。そして、該駆動軸80bと、該駆動軸80bに固定された太陽歯車90と、該駆動軸80bにワンウェイクラッチ81dを介して連結された出力歯車81とが一体的に等速度で図7(c)の矢印r,m方向に正回転する。   Further, the output gear 81 and the drive shaft 80b of the motor 80 are connected by a one-way clutch 81d serving as a third control means. The drive shaft 80b, the sun gear 90 fixed to the drive shaft 80b, and the output gear 81 connected to the drive shaft 80b via a one-way clutch 81d are integrally formed at a constant speed as shown in FIG. ) In the directions of arrows r and m.

図8(a),(b)はモータ80の駆動軸80bが逆回転した場合の出力歯車81の回転動作を示す。図8(a),(b)に示すように、モータ80の駆動軸80bが図8(a),(b)の矢印n方向に逆回転すると、モータ80の駆動軸80bに固定された太陽歯車90は該駆動軸80bと一体的に図8(a),(b)の矢印n方向に等速度で逆回転する。   8A and 8B show the rotation operation of the output gear 81 when the drive shaft 80b of the motor 80 rotates in the reverse direction. As shown in FIGS. 8A and 8B, when the drive shaft 80b of the motor 80 rotates backward in the direction of the arrow n in FIGS. 8A and 8B, the sun fixed to the drive shaft 80b of the motor 80 is obtained. The gear 90 rotates reversely at a constant speed in the direction of arrow n in FIGS. 8A and 8B integrally with the drive shaft 80b.

一方、保持部材93は図6に示すワンウェイクラッチ95により固定手段となる駆動側板78に固定されたクラッチベース94との間で連結されて回転不能に固定され、静止している。そのため固定された保持部材93の回転軸3にそれぞれ回転自在に軸支された衛星歯車92はモータ80の駆動軸80bを中心に公転しなし。そして、モータ80の駆動軸80bに固定された太陽歯車90に噛合してそれぞれ回転軸3を中心に図8(b)の矢印p方向に自転する。これにより、出力歯車81の大径円筒部の内周面に設けられた内歯車81aは衛星歯車92に噛合して図8(b)の矢印q方向に正回転する。   On the other hand, the holding member 93 is connected to a clutch base 94 fixed to a driving side plate 78 as a fixing means by a one-way clutch 95 shown in FIG. Therefore, the satellite gear 92 rotatably supported on the rotary shaft 3 of the fixed holding member 93 does not revolve around the drive shaft 80b of the motor 80. And it meshes | engages with the sun gear 90 fixed to the drive shaft 80b of the motor 80, and it autorotates to the arrow p direction of FIG.8 (b) centering on the rotating shaft 3, respectively. As a result, the internal gear 81a provided on the inner peripheral surface of the large-diameter cylindrical portion of the output gear 81 meshes with the satellite gear 92 and rotates positively in the direction of the arrow q in FIG.

即ち、モータ80の駆動軸80bが図8(a),(b)の矢印n方向に逆回転すると、第一制御手段となるワンウェイクラッチ95により保持部材93と固定部材となる駆動側板78との間が連結されて、該保持部材93が固定される。更に、第三制御手段となるワンウェイクラッチ81dが空転して出力歯車81と、モータ80の駆動軸80bとの連結が解除される。   That is, when the drive shaft 80b of the motor 80 rotates reversely in the direction of arrow n in FIGS. 8A and 8B, the one-way clutch 95 serving as the first control means causes the holding member 93 and the drive side plate 78 serving as the fixed member to move. The holding member 93 is fixed by connecting the gaps. Further, the one-way clutch 81d serving as the third control means idles and the connection between the output gear 81 and the drive shaft 80b of the motor 80 is released.

そして、モータ80の駆動軸80bに固定されて該駆動軸80bと一体的に図8(a),(b)の矢印n方向に太陽歯車90が逆回転する。そして、太陽歯車90に噛合する衛星歯車92に内歯車81aが噛合する出力歯車81が図8(b)の矢印q方向で示す正回転方向に減速回転する。出力歯車81はモータ80の駆動軸80bの回転方向(逆回転)とは反対方向となる正回転方向に減速回転する。   Then, the sun gear 90 is reversely rotated in the direction of the arrow n in FIGS. 8A and 8B while being fixed to the drive shaft 80b of the motor 80 and integrally with the drive shaft 80b. Then, the output gear 81 in which the internal gear 81a meshes with the satellite gear 92 meshed with the sun gear 90 is decelerated and rotated in the normal rotation direction indicated by the arrow q direction in FIG. The output gear 81 rotates at a reduced speed in the forward rotation direction that is opposite to the rotation direction (reverse rotation) of the drive shaft 80b of the motor 80.

モータ80の駆動軸80bに対する出力歯車81の減速比は、太陽歯車90の歯数と、内歯車81aの歯数との比により決定される。本実施形態の太陽歯車90と出力歯車81との減速比を「Q/N」とすると、太陽歯車90の歯数と、内歯車81aの歯数とを用いて以下の数2式により示される。尚、以下の数2式における「−」符号は、回転方向の反転を意味する。   The reduction ratio of the output gear 81 to the drive shaft 80b of the motor 80 is determined by the ratio between the number of teeth of the sun gear 90 and the number of teeth of the internal gear 81a. Assuming that the reduction ratio between the sun gear 90 and the output gear 81 of the present embodiment is “Q / N”, the following equation 2 is used using the number of teeth of the sun gear 90 and the number of teeth of the internal gear 81a. . In addition, the "-" code | symbol in the following numerical formula 2 means inversion of a rotation direction.

Figure 0006157294
Figure 0006157294

本実施形態においてもモータ80の駆動軸80bの正逆回転の切り替えによって、出力歯車81はモータ80の駆動軸80bの回転方向が異なっても常に一定の方向に回転する。   Also in this embodiment, by switching between forward and reverse rotation of the drive shaft 80b of the motor 80, the output gear 81 always rotates in a constant direction even if the rotation direction of the drive shaft 80b of the motor 80 is different.

そして、モータ80の駆動軸80bが正回転であればモータ80の駆動軸80bと出力歯車81とは等速度回転する。そして、モータ80の駆動軸80bが逆回転であればモータ80の駆動軸80bに対して出力歯車81は、前記数2式で示される「Q/N」の減速比で正回転で減速回転する。そして、出力歯車81の小径円筒部の外周面に設けられた外歯車81cに噛合される後続の二段歯車82,84に回転駆動力を伝達する。   If the drive shaft 80b of the motor 80 is forwardly rotated, the drive shaft 80b of the motor 80 and the output gear 81 rotate at the same speed. If the drive shaft 80b of the motor 80 is reversely rotated, the output gear 81 is decelerated and rotated forward with a reduction ratio of "Q / N" expressed by the above equation 2 with respect to the drive shaft 80b of the motor 80. . Then, the rotational driving force is transmitted to the subsequent two-stage gears 82 and 84 meshed with the external gear 81c provided on the outer peripheral surface of the small diameter cylindrical portion of the output gear 81.

本実施形態においても、前記第1実施形態と同様に駆動部の騒音低減と、駆動伝達精度の維持といった効果を得ることが出来る。他の構成は前記第1実施形態と同様に構成され、同様の効果を得ることが出来る。   Also in the present embodiment, the effects of reducing the noise of the drive unit and maintaining the drive transmission accuracy can be obtained as in the first embodiment. Other configurations are the same as those in the first embodiment, and the same effects can be obtained.

尚、前記各実施形態では、駆動部の駆動伝達精度を維持できる形態として、作像系駆動部へ適用した一例について説明した。他に、記録材8を給送する駆動部や記録材8を搬送する駆動部等を含めた画像形成装置1の駆動部全般にも適用可能である。   In each of the above embodiments, an example in which the drive transmission accuracy of the drive unit can be maintained has been described as an example applied to the image forming system drive unit. In addition, the present invention can be applied to all drive units of the image forming apparatus 1 including a drive unit that feeds the recording material 8 and a drive unit that transports the recording material 8.

78 …駆動側板(固定部材)
80b …駆動軸
81 …出力歯車
81a …内歯車
90 …太陽歯車
92 …衛星歯車
93 …保持部材
93b …ワンウェイクラッチ(第二制御手段)
95 …ワンウェイクラッチ(第一制御手段)
78… Drive side plate (fixing member)
80b ... Drive shaft
81… Output gear
81a ... Internal gear
90… Sun gear
92… Satellite gear
93… Holding member
93b ... One-way clutch (second control means)
95 ... One-way clutch (first control means)

Claims (6)

正逆回転可能な駆動源の駆動軸と、
前記駆動軸と一体的に回転する太陽歯車と、
前記太陽歯車と噛合する少なくとも一つ以上の衛星歯車と、
前記衛星歯車の回転軸を支持する保持部材と、
前記衛星歯車と噛合する内歯車を有する出力歯車と、
前記保持部材と固定部材との間の連結と解除とを制御する第一制御手段と、
前記保持部材と前記駆動軸との間の連結と解除とを制御する第二制御手段と、
を有し、
前記保持部材と、前記太陽歯車と、前記出力歯車と、が前記駆動軸と同一軸線を中心に回転可能に設けられ、
前記駆動軸が正回転すると、前記第一制御手段により前記保持部材と前記固定部材との連結が解除され、且つ前記第二制御手段により前記保持部材と前記駆動軸とが連結されて、前記駆動軸と、前記保持部材と、前記太陽歯車と、前記太陽歯車に噛合する前記衛星歯車に前記内歯車が噛合する前記出力歯車と、が一体的に等速度回転し、
前記駆動軸が逆回転すると、前記第一制御手段により前記保持部材と前記固定部材とが連結され、且つ前記第二制御手段により前記保持部材と前記駆動軸との連結が解除されて、前記保持部材が固定され、前記駆動軸と、前記太陽歯車とが一体的に等速度回転し、前記太陽歯車に噛合する前記衛星歯車に前記内歯車が噛合する前記出力歯車が前記駆動軸の回転方向とは反対方向に減速回転することを特徴とする駆動装置。
A drive shaft of a drive source capable of forward and reverse rotation;
A sun gear that rotates integrally with the drive shaft;
At least one satellite gear meshing with the sun gear;
A holding member for supporting the rotation shaft of the satellite gear;
An output gear having an internal gear meshing with the satellite gear;
First control means for controlling connection and release between the holding member and the fixing member;
Second control means for controlling connection and release between the holding member and the drive shaft;
Have
The holding member, the sun gear, and the output gear are provided rotatably about the same axis as the drive shaft,
When the drive shaft rotates in the forward direction, the first control means releases the connection between the holding member and the fixed member, and the second control means connects the holding member and the drive shaft, thereby driving the drive. The shaft, the holding member, the sun gear, and the output gear with which the internal gear meshes with the satellite gear that meshes with the sun gear, integrally rotate at a constant speed,
When the drive shaft rotates reversely, the holding member and the fixing member are connected by the first control means, and the connection between the holding member and the drive shaft is released by the second control means, and the holding A member is fixed, the drive shaft and the sun gear rotate integrally at a constant speed, and the output gear with which the internal gear meshes with the satellite gear that meshes with the sun gear has a rotational direction of the drive shaft. Is a driving device characterized by rotating at a reduced speed in the opposite direction.
前記第一、第二制御手段のうちの少なくとも1つはワンウェイクラッチで構成されることを特徴とする請求項1に記載の駆動装置。   The drive device according to claim 1, wherein at least one of the first and second control means includes a one-way clutch. 正逆回転可能な駆動源の駆動軸と、
前記駆動軸と一体的に回転する太陽歯車と、
前記太陽歯車と噛合する少なくとも一つ以上の衛星歯車と、
前記衛星歯車の回転軸を支持する保持部材と、
前記衛星歯車と噛合する内歯車を有する出力歯車と、
前記保持部材と固定部材との間の連結と解除とを制御する第一制御手段と、
前記出力歯車と前記駆動軸との間の連結と解除とを制御する第三制御手段と、
を有し、
前記保持部材と、前記太陽歯車と、前記出力歯車と、が前記駆動軸と同一軸線を中心に回転可能に設けられ、
前記駆動軸が正回転すると、前記第一制御手段により前記保持部材と前記固定部材との連結が解除され、且つ前記第三制御手段により前記出力歯車と前記駆動軸とが連結されて、前記駆動軸と、前記太陽歯車と、前記出力歯車とが一体的に等速度回転し、
前記駆動軸が逆回転すると、前記第一制御手段により前記保持部材と前記固定部材とが連結されて、前記保持部材が固定され、且つ前記第三制御手段により前記出力歯車と前記駆動軸との連結が解除されて、前記太陽歯車に噛合する前記衛星歯車に前記内歯車が噛合する前記出力歯車が前記駆動軸の回転方向とは反対方向に減速回転することを特徴とする駆動装置。
A drive shaft of a drive source capable of forward and reverse rotation;
A sun gear that rotates integrally with the drive shaft;
At least one satellite gear meshing with the sun gear;
A holding member for supporting the rotation shaft of the satellite gear;
An output gear having an internal gear meshing with the satellite gear;
First control means for controlling connection and release between the holding member and the fixing member;
Third control means for controlling connection and release between the output gear and the drive shaft;
Have
The holding member, the sun gear, and the output gear are provided rotatably about the same axis as the drive shaft,
When the drive shaft rotates in the forward direction, the first control means releases the connection between the holding member and the fixed member, and the third control means connects the output gear and the drive shaft, thereby driving the drive. The shaft, the sun gear, and the output gear rotate integrally at a constant speed,
When the drive shaft rotates reversely, the holding member and the fixing member are connected by the first control means, the holding member is fixed, and the output gear and the drive shaft are fixed by the third control means. The drive device, wherein the output gear, the internal gear meshing with the satellite gear meshing with the sun gear, is decelerated and rotated in a direction opposite to the rotational direction of the drive shaft after being disconnected.
前記第一、第三制御手段のうちの少なくとも1つはワンウェイクラッチで構成されることを特徴とする請求項3に記載の駆動装置。   The drive device according to claim 3, wherein at least one of the first and third control means is constituted by a one-way clutch. 請求項1〜4のいずれか1項に記載の駆動装置と、
画像を形成する画像形成手段と、
を有することを特徴とする画像形成装置。
The drive device according to any one of claims 1 to 4,
An image forming means for forming an image;
An image forming apparatus comprising:
前記画像形成手段は、
静電潜像が形成される像担持体と、
前記像担持体に現像剤を供給する現像剤担持体と、
を有し、
前記像担持体または前記現像剤担持体のうちの少なくとも1つが前記駆動装置により駆動されることを特徴とする請求項5に記載の画像形成装置。
The image forming unit includes:
An image carrier on which an electrostatic latent image is formed;
A developer carrier for supplying a developer to the image carrier;
Have
6. The image forming apparatus according to claim 5, wherein at least one of the image carrier and the developer carrier is driven by the driving device.
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JPH07198002A (en) * 1994-01-10 1995-08-01 Secoh Giken Inc Change gear
JP4110334B2 (en) * 1998-03-31 2008-07-02 ブラザー工業株式会社 Gear-type power transmission device in image forming apparatus
JP4378831B2 (en) * 1999-03-30 2009-12-09 コニカミノルタビジネステクノロジーズ株式会社 Rotating body driving device, image forming apparatus using the same, and rotating body driving method
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JP2005054861A (en) * 2003-08-01 2005-03-03 Ricoh Co Ltd Rotary driving device, fixing device, and image forming device
JP2007047629A (en) * 2005-08-12 2007-02-22 Fuji Xerox Co Ltd Image forming apparatus
JP4689517B2 (en) * 2006-03-31 2011-05-25 京セラミタ株式会社 Driving device used in image forming apparatus
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