JP2004045603A - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
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- JP2004045603A JP2004045603A JP2002201114A JP2002201114A JP2004045603A JP 2004045603 A JP2004045603 A JP 2004045603A JP 2002201114 A JP2002201114 A JP 2002201114A JP 2002201114 A JP2002201114 A JP 2002201114A JP 2004045603 A JP2004045603 A JP 2004045603A
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、従動側である給紙ユニット、感光体クリーニングユニット等の回転軸と、画像形成装置本体側である駆動側の回転軸とを連結する連結部材(以下、カップリングともいう)を有する画像形成装置に関する。
【0002】
【従来の技術】
従来、複写機、プリンタ等の画像形成装置の給紙ユニット、感光体クリーニングユニット等の回転体の回転軸と、画像形成装置本体側である駆動側の回転軸との間の動力伝達には、駆動伝達用のカップリングが使われているが、装置本体にユニットを取り付ける時の軸相互のセンタリング等の調整に時間がかかり、例えば、軸間のセンタがずれると異常音が発生し、構成要素の耐久性が低下する傾向がある。また、市販のユニバーサルジョイント等を利用する場合もあるが、材料コストがかさみ必ずしも利点ばかりではない。
【0003】
【発明が解決しようとする課題】
駆動側と従動側の回転軸のセンタずれによる異常音や耐久性の低下を解消できるカップリングを有した画像形成装置を提供すること。
【0004】
【課題を解決するための手段】
駆動側の回転軸から従動側の装置ユニットの回転軸へ駆動力を伝達するための連結部材を有する画像形成装置において、前記装置ユニットの回転軸と、前記装置ユニットの回転軸に挿着される連結部材の軸穴との間に、所定のクリアランスが設けられていることを特徴とする画像形成装置。
【0005】
【発明の実施の形態】
以下、本発明の実施の形態である画像形成装置の一例を図面に基づいて説明する。
【0006】
なお、本発明の実施の形態における説明では、本明細書に用いる用語により発明の技術範囲が限定されることはない。
【0007】
図1はプリンタから成る画像形成装置の全体構成の一例を示す模式図である。図において、10は画像形成体である感光体、11は帯電手段である帯電装置、12は画像書込手段である露光光学系、13は現像手段である現像器、14は感光体10の表面を清掃するためのクリーニング装置、15はクリーニングブレード、16は現像スリーブ、17は転写手段である転写極、18は転写材を感光体10からの分離手段である分離極、19は転写材の感光体10に対する巻き付き防止の分離爪である。感光体10、帯電装置11、露光光学系12、現像器13、転写極17,分離極18、分離爪19およびクリーニング装置14等が画像形成手段1を構成している。
【0008】
感光体10は、例えばアルミ材によって形成される円筒状の金属基体の外周に導電層、a−Si層あるいは有機感光層(OPC)等の感光層を形成したものであり、導電層を接地した状態で図の矢印で示す時計方向に回転される。
【0009】
20は複数個の穴があけられた搬送ベルト、21は駆動ローラ、22は従動ローラ、23は吸引箱で、前記搬送ベルト20と接触する面に複数個の穴があけられ、不図示のダクトおよび吸引ファン等に接続され、走行する前記搬送ベルト20上に転写材Pを吸引する機能を果たす。搬送ベルト20、駆動ローラ21、従動ローラ22、吸引箱23等で搬送手段2を形成する。
【0010】
3は給紙トレイ、31は送り出しローラ、32、33は搬送ローラ対、34はタイミングローラ対、35は手差し送り出しローラ、36は手差し給紙皿、38はプレレジストローラ、4は定着装置、41は熱定着ローラ、42は圧着ローラ、70は画像読み取り部を示す。
【0011】
次に、図1に基づいて画像形成プロセスを説明する。
画像形成(記録)のスタートにより不図示の駆動モータが回転を開始すると、感光体10は矢印で示す時計方向に回転する。同時に帯電装置11により感光体10に対する電位の付与が開始される。
【0012】
電位が付与された後の感光体10上には、画像読み取り装置70からの画像データに対応する電気信号の画像書込みが露光光学系12を通して開始され、感光体10の表面に原稿画像に対応する静電潜像が形成され、当該静電潜像は現像器13の現像スリーブ16で搬送される現像剤により反転現像され、トナー像(可視像)となる。
【0013】
一方、転写材Pは、機械内に収納された給紙トレイ3から供給される場合、送り出しローラ31によって送り出され、プレレジストローラ38、搬送ローラ対32を経て、タイミングローラ34対へ搬送され、感光体10上のトナー像と同期がとられ、当該タイミングローラ対34の駆動によって送り出され、転写極17と感光体10との間の領域へ給送される。手差し給紙の場合でも、手差し給紙皿36の転写材Pは、手差し送り出しローラ35によって送り出され、搬送ローラ対33を経て、タイミングローラ34へ搬送され、感光体10上のトナー像と同期がとられ、当該タイミングローラ34の駆動によって送り出され、転写極17と感光体10との間の領域へ給送される。
【0014】
前記トナー像は、トナーと反対極性の電圧が印加された転写極17によって前記転写材P上に転写される。
【0015】
その後、感光体10は回転を続け、クリーニング装置14によって清掃され、次の画像形成に向けられる。
【0016】
一方、前記トナー像を載せた転写材Pは、分離極18でAC電圧による除電作用を受け、感光体10との吸着力が弱められ、感光体10から曲率分離する。なお、転写材Pが環境湿度等に影響され、感光体10に巻き付いてしまう場合を懸念し分離爪19が設けられている。
【0017】
分離された転写材Pは搬送手段2へと送られ、吸引箱23によって搬送ベルト20に吸引されて定着装置40へと搬送される。その後、転写材Pは熱定着ローラ41と圧着ローラ42の間のニップ部Tで挟持搬送されながら熱と圧力とが加えられることにより、トナー像は転写材P上に溶融定着される。定着された転写材Pは定着排紙ローラ43によって排紙皿71に排紙される。
【0018】
以下、給紙トレイに係わる駆動部について説明する。
本発明は、駆動側の回転軸である駆動伝達軸から従動側にある装置ユニットの回転軸への駆動力を伝達するための連結部材を有する画像形成装置に関するもので、実施の形態では、一例として、給紙トレイの送り出しローラの駆動力伝達について図を基に説明する。
【0019】
図2は、給紙トレイおよび駆動連結部を示す図である。
図は給紙トレイ3のEE′矢視断面(図1参照)を示している。給紙トレイ3は、給紙駆動部5、送り出しローラ31、送り出しローラ軸311、トレイ枠体340、転写材押し上げ板341等からなり、当該トレイ枠体340と装置本体の不図示の枠体に設けられたガイドレール39(図1参照)に沿って矢印B、F方向にスライドする。
【0020】
給紙駆動部5は、給紙クラッチ312、送り出しローラ31に動力を伝える歯車313、当該歯車313と噛み合うユニットの回転軸315と一体の歯車314、当該回転軸315上で矢印H方向にスライドするカップリング316、バネ317等からなっている。当該カップリング316は駆動伝達軸320の先端部に嵌入されている駆動ピン330(図3参照)と係合している。歯車313は、送り出し(給紙)動作が行われている時以外は、給紙クラッチ312が作動しないので送り出しローラ軸311上で空転している。
【0021】
転写材Pの装填、給紙ジャム処理等で給紙トレイ3をF方向に引き出すと、駆動伝達部6は本体側の駆動伝達軸320の駆動ピン330との係合が解除されることになる。321は駆動伝達軸320と一体のプーリ、322は駆動用のベルト、323は中段トレイの給紙駆動に係わるプーリ、324は駆動用のベルト、325は下段トレイの給紙駆動に係わるプーリ、326はプーリ、327は駆動用のベルトである。給紙駆動モータ328からの動力は、これら一連のプーリ、ベルトを介して上、中、下段トレイの各給紙駆動部に伝達される。
【0022】
6は本発明に係る駆動伝達部であり、図を用いて詳細に説明をする。
図3は、駆動伝達部の構成と効果を説明するための図である。
【0023】
図において(a)は従来の装置ユニットの回転軸およびカップリングを示す。(b)は本発明の装置ユニットの回転軸およびカップリングを示す。(c)は装置ユニットの回転軸及びカップリングと駆動伝達軸の軸芯が互いにずれて咬合した状態を示す図である。(d)、(e)は図(a)、図(b)のカップリングの断面を示す図である。
【0024】
駆動伝達部6は、図3(a)、(b)、(c)に示すように、装置ユニットの回転軸315にカップリング316が挿着されている。当該回転軸315の先端近傍にスライドピン331が嵌入されており、スライドピン331は挿着部で前記カップリング316の駆動側に設けられたガイド溝wと係合している。また、前記カップリング316の一方の端部には、回転軸315に持着されたコイルバネ317が当接し、他方の端部には掛合部vが設けられている。カップリング316は、前記回転軸315のスライドピン331が前記ガイド溝wから外れない位置にあり、回転軸315上で矢印(実線、点線)の方向にガイド溝wに沿って摺動できる。
【0025】
前記駆動伝達軸320からの駆動力は、駆動ピン330が、前記カップリング316の掛合部vに係合することによって伝達される。
【0026】
いま、給紙トレイ3(図2参照)が引き出されている(カップリング316が駆動伝達軸320との係合から外れた)状態からB方向(図2参照)にスライドさせ、カップリング316と駆動伝達軸320とを係合させる場合、たまたま、前記駆動ピン330と前記掛合部vとの位相が合わない場合は、当該駆動ピン330がカップリング316の端面rを押し、カップリング316は前記スライドピン331にガイドされ、コイルバネ317に抗して矢印方向(実線)にスライドすることになり、端面rを駆動ピン330が押した状態で駆動伝達軸320は回転をはじめるが、回転が進んで前記掛合部vと駆動ピン330とが一致した時点でカップリング316がコイルバネ317に押され矢印方向(点線)にスライドし、カップリング316が前記掛合部vと係合して駆動伝達が可能になる(図(a)、(b))。
【0027】
ここで、図3(b)、(c)を基に本発明について説明する。
図3(b)において、前記カップリング挿着部319と回転軸315との間には所定のクリアランスqが設けられており、回転軸315と駆動伝達軸320の軸芯が精度良く合わなくとも、図3(c)に示すように、カップリング316が傾き加減になって駆動伝達軸320と連結でき、動力を伝達することができる。前記所定のクリアランスqは0.5〜2mmが好ましい。仮に、クリアランスqが0.5mmより小さい場合は、カップリングの首振り量が少なくなり、センタずれによる不具合を吸収できなくなる。逆に、2mmより大きい場合は、首振り量が大きくなって、スライドピン331との擦れ量も増し、ガイド溝wの摩耗が増大する。
【0028】
すなわち、本発明は、駆動側の駆動伝達軸320と従動側の回転軸315とのセンタがズレていても、カップリング挿着部319(カップリング316の軸穴部)の穴径と装置ユニットの回転軸径の間にクリアランスを設けることにより、カップリング316が傾斜して首振り作用を受け、動力の伝達が可能となり、駆動側と給紙トレイ側との厳密な位置合わせ(センタ調整)も不要となる。従って、給紙ユニットを本体側に取り付ける際に組み立て用の工具も不要となり、従来のようなセンタずれによる異常音も発生せず、低コスト、コンパクトな利点が得られることを特徴としている。
【0029】
図4は確認実験における駆動伝達部の寸法を示す図である。
図において、(a)は装置ユニットの回転軸にカップリングが挿着されている図である。(b)は側面図である。(c)は装置ユニットの回転軸及びカップリングと駆動伝達軸の軸芯が互いにずれて咬合した状態を示す図である。
【0030】
いま、図4(a)に示すように、カップリング316の軸穴径Dは6mm、回転軸315の軸径dは5mmで1mmのクリアランスとして、図4(c)に示すように、回転軸315と駆動伝達軸320とのセンタずれ量mを3mm、駆動ピン330とスライドピン331の間隔nを12とし、カップリングの傾きθを5°とした場合の駆動伝達状況をチェックした結果、センタずれによる異常音も異常振動も確認されなかった。
【0031】
なお、実施の形態では、カップリングを装置ユニットの回転軸側に挿着したが、逆に、駆動伝達軸側に挿着しても同様な効果が得られる。
【0032】
以上、実施の形態として、給紙トレイの送り出しローラの駆動力伝達部を例として説明したが、クリーニング部、転写材搬送部等の比較的軽トルクの小さい駆動部に適用も可能である。
【0033】
【発明の効果】
カップリングが挿着される装置ユニットの回転軸の軸径とカップリング軸穴径との間に所定のクリアランスを設けることにより、センタずれによる異常音を解消でき、低コスト、コンパクトな構成で厳密なセンタ調整の不要なカップリングを得ることができる。
【図面の簡単な説明】
【図1】プリンタから成る画像形成装置の全体構成の一例を示す模式図である。
【図2】給紙トレイおよび駆動連結部を示す図である。
【図3】駆動伝達部の構成と効果を説明するための図である。
【図4】確認実験における駆動伝達部の寸法を示す図である。
【符号の説明】
1 画像形成手段
3 給紙トレイ
5 給紙駆動部
6 駆動伝達部
31 送り出しローラ
312 給紙クラッチ
316 カップリング
319 カップリング挿着部
321,323,325 プーリ
322,324,327 ベルト[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a connecting member (hereinafter, also referred to as a coupling) for connecting a rotating shaft of a paper feed unit, a photoconductor cleaning unit, and the like, which is a driven side, and a rotating shaft of a driving side, which is a main body of the image forming apparatus. The present invention relates to an image forming apparatus.
[0002]
[Prior art]
Conventionally, a copying machine, a paper feed unit of an image forming apparatus such as a printer, a rotating shaft of a rotating body such as a photoconductor cleaning unit, and a power transmission between a rotating shaft of a driving side which is a main body of the image forming apparatus, Although a drive transmission coupling is used, it takes time to adjust the centering of the axes when mounting the unit to the device body. For example, if the center between the axes is shifted, abnormal noise is generated, Has a tendency to decrease in durability. In some cases, a commercially available universal joint or the like may be used, but the material cost is increased, and this is not necessarily an advantage.
[0003]
[Problems to be solved by the invention]
Provided is an image forming apparatus having a coupling that can eliminate abnormal noise and reduced durability due to a center shift between a rotation shaft on a driving side and a driven side.
[0004]
[Means for Solving the Problems]
In an image forming apparatus having a coupling member for transmitting a driving force from a rotation shaft on a driving side to a rotation shaft of a device unit on a driven side, the image forming apparatus is inserted into the rotation shaft of the device unit and the rotation shaft of the device unit. An image forming apparatus, wherein a predetermined clearance is provided between the connecting member and a shaft hole.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.
[0006]
In the description of the embodiments of the present invention, the technical scope of the present invention is not limited by the terms used in this specification.
[0007]
FIG. 1 is a schematic diagram illustrating an example of the entire configuration of an image forming apparatus including a printer. In the drawing,
[0008]
The
[0009]
[0010]
3 is a paper feed tray, 31 is a feed roller, 32 and 33 are transport roller pairs, 34 is a timing roller pair, 35 is a manual feed roller, 36 is a manual feed tray, 38 is a pre-registration roller, 4 is a fixing device, 41 Denotes a heat fixing roller, 42 denotes a pressure roller, and 70 denotes an image reading unit.
[0011]
Next, an image forming process will be described with reference to FIG.
When a drive motor (not shown) starts rotating at the start of image formation (recording), the
[0012]
Image writing of an electric signal corresponding to the image data from the
[0013]
On the other hand, when the transfer material P is supplied from the paper feed tray 3 stored in the machine, the transfer material P is sent out by the
[0014]
The toner image is transferred onto the transfer material P by the
[0015]
Thereafter, the
[0016]
On the other hand, the transfer material P on which the toner image is placed is subjected to the charge eliminating action by the AC voltage at the
[0017]
The separated transfer material P is sent to the transporting means 2, sucked by the
[0018]
Hereinafter, a driving unit related to the sheet feeding tray will be described.
The present invention relates to an image forming apparatus having a connecting member for transmitting a driving force from a drive transmission shaft, which is a drive-side rotation shaft, to a rotation shaft of an apparatus unit on a driven side. The transmission of the driving force of the feed roller of the sheet feed tray will be described with reference to the drawings.
[0019]
FIG. 2 is a diagram illustrating a paper feed tray and a drive connection unit.
The figure shows a cross section of the sheet feed tray 3 as viewed from the direction of the arrow EE '(see FIG. 1). The paper feed tray 3 includes a paper
[0020]
The paper
[0021]
When the paper feed tray 3 is pulled out in the direction F by loading of the transfer material P, paper feed jam processing, or the like, the
[0022]
FIG. 3 is a diagram for explaining the configuration and effects of the drive transmission unit.
[0023]
In the figure, (a) shows a rotation shaft and a coupling of a conventional device unit. (B) shows a rotation axis and a coupling of the device unit of the present invention. (C) is a figure which shows the state which the rotation axis of the apparatus unit, the coupling, and the shaft center of a drive transmission shaft shifted mutually and engaged. (D), (e) is a figure which shows the cross section of the coupling of figure (a), figure (b).
[0024]
As shown in FIGS. 3A, 3B, and 3C, the
[0025]
The driving force from the
[0026]
Now, the paper feed tray 3 (see FIG. 2) is pulled out (the
[0027]
Here, the present invention will be described with reference to FIGS.
In FIG. 3B, a predetermined clearance q is provided between the
[0028]
That is, even if the center of the drive-side
[0029]
FIG. 4 is a diagram showing the dimensions of the drive transmission unit in the confirmation experiment.
In the drawing, (a) is a diagram in which a coupling is inserted into a rotation shaft of the device unit. (B) is a side view. (C) is a figure which shows the state which the rotation axis of the apparatus unit, the coupling, and the shaft center of a drive transmission shaft shifted mutually and engaged.
[0030]
Now, as shown in FIG. 4A, the shaft hole diameter D of the
[0031]
In the embodiment, the coupling is inserted on the rotary shaft side of the device unit. Conversely, the same effect can be obtained by inserting the coupling on the drive transmission shaft side.
[0032]
As described above, the embodiment has been described by taking as an example the driving force transmitting unit of the feed roller of the sheet feeding tray, but the present invention is also applicable to a driving unit with a relatively small torque such as a cleaning unit and a transfer material conveying unit.
[0033]
【The invention's effect】
By providing a predetermined clearance between the shaft diameter of the rotation shaft of the device unit into which the coupling is inserted and the diameter of the coupling shaft hole, abnormal noise due to center deviation can be eliminated. It is possible to obtain a coupling that does not require a special center adjustment.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an example of an overall configuration of an image forming apparatus including a printer.
FIG. 2 is a diagram illustrating a paper feed tray and a drive connection unit.
FIG. 3 is a diagram for explaining a configuration and an effect of a drive transmission unit.
FIG. 4 is a diagram illustrating dimensions of a drive transmission unit in a confirmation experiment.
[Explanation of symbols]
Reference Signs List 1 Image forming means 3
Claims (2)
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JP2002201114A JP2004045603A (en) | 2002-07-10 | 2002-07-10 | Image forming apparatus |
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JP2002201114A JP2004045603A (en) | 2002-07-10 | 2002-07-10 | Image forming apparatus |
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JP2004045603A true JP2004045603A (en) | 2004-02-12 |
JP2004045603A5 JP2004045603A5 (en) | 2005-09-08 |
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