JP2004271837A - Cleaning device for charging device - Google Patents

Cleaning device for charging device Download PDF

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Publication number
JP2004271837A
JP2004271837A JP2003061711A JP2003061711A JP2004271837A JP 2004271837 A JP2004271837 A JP 2004271837A JP 2003061711 A JP2003061711 A JP 2003061711A JP 2003061711 A JP2003061711 A JP 2003061711A JP 2004271837 A JP2004271837 A JP 2004271837A
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JP
Japan
Prior art keywords
cleaning
discharge wire
holding member
charger
cleaning device
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JP2003061711A
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Japanese (ja)
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JP4067430B2 (en
Inventor
Shingo Sakado
伸吾 坂戸
Ai Takagami
愛 高上
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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Priority to JP2003061711A priority Critical patent/JP4067430B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning device for a charging device wherein the cleaning device cleans the entire face of discharge wire by a simple structure, prevents nonuniform discharge caused by an image density change and degradation in the image quality of a copy, and prolongs the life of the charging device. <P>SOLUTION: When moving a hold member 16 to the vicinity of a rear housing 12 in a forward direction 22, the hold member 16 comes into contact with a rotary guide member 23. At this time, a projection 16e (or 16f) on the side of the end 16b of the hold member 16 comes into contact with the projection 23a (or 23b) of the rotary guide member 23, and abuts on the guide face 23e (or 23f) of the projection 23a (or 23f). While abutting on the guide face 23e (or 23f), the projection 16e (or 16f) on the side of the end 16b of the hold member 16 slides along the guide face 23e (or 23f) in the direction of the arrow 25 shown in the drawing. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、デジタル複写機、ファクシミリ、プリンター等の画像形成装置に用いられる帯電器の清掃装置であって、帯電器が有する放電用ワイヤを清掃する清掃部材を有する帯電器の清掃装置に関する。
【0002】
【従来の技術】
図13は、一般に用いられているデジタル複写機、ファクシミリ、プリンター等の画像形成装置における画像形成装置本体内の主要部の構成を概略的に示す正面図である。当該主要部は、一方向(図中の矢印方向)に回転する感光体ドラム1、感光体ドラム1に対向するとともに、当該感光体ドラム1の上記回転方向に沿って配設された帯電ユニット2、現像ユニット3、転写ユニット4、分離ユニット5、及びクリーニングユニット6から構成されている。
【0003】
この様な構成のもとで、不図示の原稿読取部により、複写原稿の画像が読み取られ、これとともに図中の矢印方向に回転する感光体ドラム1の表面は帯電ユニット2により一様に帯電させられる。次いで、原稿読取部によって読み取られた画像に基づく光が、露光ユニット7により感光体ドラム1の表面に照射されてその画像の静電潜像が形成され、その後、現像ユニット3によりその静電潜像にトナーを付着させトナー像が形成される。
【0004】
更に、用紙供給経路8を経由して感光体ドラム1と転写ユニット4との間に供給された用紙(不図示)上に、転写ユニット4により感光体ドラム1からトナー像が引き寄せられて転写される。その後、トナー像が転写された用紙は分離ユニット5により感光体ドラム1から分離されて、不図示の定着ユニットに搬送され、この定着ユニットによりそのトナー像が転写紙上に定着される。
【0005】
一方、転写ユニット4によるトナー像転写後、感光体ドラム1の表面に残留するトナーは、クリーニングユニット6により完全に除去される。そして、残留トナーが除去された感光体ドラム1は、複数のLED等で構成された不図示の除電部によりその表面の残留電荷が除去され、帯電ユニット2に至る。
【0006】
この様な画像形成装置において、上述の動作を繰り返していると、トナー飛散や紙粉等により、帯電ユニット2、転写ユニット4、及び分離ユニット5等のコロナ帯電器に設けられた放電用ワイヤが汚れてくる。特に、トナーやグリースに含まれるシリコンと、放電により空気中に発生したオゾンとの反応により、シリカ(SiO)が発生し、これが放電用ワイヤに付着するといった問題が生じる。この様な汚れを放置しておくと、放電性能が減少して帯電均一性が失われ、画像濃度の変化に伴う放電ムラ等が発生し、複写画質が低下するとともに、これらの帯電器の寿命が短くなってしまうという問題が生じてしまう。そこで、これらのコロナ帯電器を定期的に清掃し、上記不都合を回避する必要がある。
【0007】
図14、図15は、従来における帯電器の清掃装置の断面図である。当該清掃装置において、開閉可能な二又状脚部を有する支持部材50の脚部51の各内面に清掃部材52が設けられており、上記脚部51に形成された突起部53を、移動部材54に形成された開口部55に係合させ、支持部材50を移動部材54に保持する構成となっている。又、この際、図14に示す様に、清掃部材52が放電用ワイヤ56を両側から挟み込む様に、突起部53を開口部55に係合させる。又、チャージャーケース57に形成された穴部58に移動部材54の下部を嵌合し、当該移動部材54を放電用ワイヤ56の張架方向(長手方向)に沿って移動させることにより、放電用ワイヤの清掃を行う構成となっている。(例えば、特許文献1参照)。
【0008】
【特許文献1】
特開平3−48871号公報(第5−6頁、第3−4図)
【0009】
【発明が解決しようとする課題】
しかし、上記従来の清掃装置においては、上述のごとく、清掃部材52が放電用ワイヤ56を両側から挟み込む構成となっており、清掃部材52が放電用ワイヤ56の両側面にのみ当接する構成となっているため、この状態下で、移動部材54を放電用ワイヤ56の張架方向(長手方向)に沿って移動させても、放電用ワイヤ56の全面を清掃することができない。従って、上述の放電用ワイヤ56の汚れを完全に除去することが出来ず、結果として、画像濃度の変化に伴う放電ムラ等の発生や、複写画質の低下を回避することが困難になり、又、帯電器の寿命が短命化するという不都合が生じていた。
【0010】
本発明は、上記問題点を解決し、簡単な構成で放電用ワイヤの全面を清掃するとともに、画像濃度の変化に伴う放電ムラ等の発生や、複写画質の低下を回避し、帯電器の長寿命化を図ることができる帯電器の清掃装置を提供することを目的とする。
【0011】
【課題を解決するための手段】
上記目的を達成するために、本発明は、帯電器が有する放電用ワイヤと当接する清掃部材と、清掃部材を保持する保持部材とを有し、清掃部材を往復移動させることにより、放電用ワイヤを清掃する帯電器の清掃装置において、往復移動の際に保持部材を回転させることにより、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させ、放電用ワイヤの全面を清掃することを特徴とする。
【0012】
この構成によると、清掃部材の往復移動の際に、清掃部材が収容された保持部材を回転させ、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させることが可能になるため、放電用ワイヤの全面を清掃することが可能になり、当該放電用ワイヤの汚れを効果的に除去することが可能になる。
【0013】
又、本発明は、駆動用ワイヤが挿通された回転用ガイド部材を更に有し、保持部材に設けられた突起部が、回転用ガイド部材に設けられたガイド面に当接した状態で摺動するとともに回転用ガイド部材に形成された溝に係合することにより保持部材が回転することを特徴とする。
【0014】
この構成によると、清掃部材の往復移動の際に、清掃部材が収容された保持部材を回転用ガイド部材により回転させ、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させることが可能になるため、放電用ワイヤの全面を清掃することが可能になり、当該放電用ワイヤの汚れを効果的に除去することが可能になる。
【0015】
ここで、本発明においては、上記保持部材の回転角度を90度とすることができる。この構成によると、清掃部材を1往復移動させれば、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させ、放電用ワイヤの全面を清掃することが可能になるため、簡単な構成で当該放電用ワイヤの汚れを効果的かつ容易に除去することが可能になる。
【0016】
【発明の実施の形態】
以下、図面を参照して、本発明の実施形態を詳細に説明する。本発明は、帯電器が有する放電用ワイヤと当接する清掃部材と、清掃部材を保持する保持部材とを有し、清掃部材を往復移動させることにより、放電用ワイヤを清掃する帯電器の清掃装置に関するものであり、図1は、本発明の実施形態に係る帯電器の清掃装置が装着された帯電ユニットの全体構成を示す斜視図であり、図2は、本発明の実施形態に係る帯電器の清掃装置の概略構成を示す断面図であり、図3は、本発明の実施形態に係る帯電器の清掃装置における保持部材を示す斜視図であり、図4は、本発明の実施形態に係る帯電器の清掃装置が装着された帯電ユニットの全体構成を示す側面図である。
【0017】
尚、本実施形態は、帯電ユニット、転写ユニット、及び分離ユニット等のコロナ帯電器のうち、帯電ユニットを例にとって適用したものであり、転写ユニット、及び分離ユニット等の他のコロナ帯電器にも適用可能であることは言うまでもない。
【0018】
図1に示す様に、帯電ユニット5のシールドケース10には、当該シールドケース10に設けられた前側ハウジング11から後側ハウジング12へ向けて、放電用ワイヤ13が張架されている。この放電用ワイヤ13は、図示しない所定の電源と接続されており、図13において示した感光体ドラム1に向けて放電を行い、感光体ドラム1の表面を一様に帯電する。
【0019】
又、本実施形態にかかる清掃装置は、帯電ユニット5が有する放電用ワイヤ13と当接する清掃部材15と、清掃部材15を保持する保持部材16と、保持部材16が取り付けられる移動部材17と、放電用ワイヤ13が挿通された回転用ガイド部材23、24から構成されている。
【0020】
より詳しくは、図3に示す様に、清掃部材15は、2個の清掃用パッド15a、15bにより構成されており、これらの清掃用パッド15a、15bは、略円筒形状を有する保持部材16の内面に保持され、保持部材16内に収納されている。又、保持部材16には、略円筒形状を有する4つの突起部16c〜16fが設けられており、このうち、突起部16c、16dは、端部16aの両側面に設けられ、突起部16e、16fは、端部16bの両側面に設けられている。
【0021】
又、図2、図4に示す様に、保持部材16は、胴体部16b’を介して移動部材17に嵌着されており、保持部材16を移動部材17に対し回動自在に保持する構成となっている。即ち、保持部材16は、移動部材17に対して、図2に示す矢印の方向に回転可能となる様に保持されている。尚、保持部材の回転機構に関しては、後に詳しく説明する。
【0022】
又、図1、図2に示す様に、シールドケース10の底板部18には、放電用ワイヤ13の張架方向に沿って穴部19が形成されており、移動部材17の両端に形成された2ヶ所の溝部17aに底板部18を挿入することにより、当該移動部材17を穴部19に嵌合し、清掃部材15が収容された保持部材16を嵌着した移動部材17を放電用ワイヤ13の張架方向(長手方向)に沿って往復移動させることにより、放電用ワイヤ13と当接する清掃部材15を往復移動させ、放電用ワイヤ13の清掃を行う構成となっている。
【0023】
尚、本実施形態においては、移動部材17の駆動手段としてモータを使用している。即ち、図1、図4に示す様に、シールドケース10に設けられた後側ハウジング12の下方に駆動用モータ20を設け、放電用ワイヤ13の張架方向(長手方向)に沿って設けられたスパイラル形状を有するネジ21を当該モータ20に接続する。そして、図2に示す移動部材17の下側突起部17bに形成されたネジ穴17cを当該ネジ21に挿入し、モータ20を駆動することにより、移動部材17を放電用ワイヤ13の張架方向(長手方向)に沿って往復移動させ、放電用ワイヤ13の清掃を行う構成となっている。尚、上記ネジ21の代わりに駆動式のワイヤを用いる構成としても良い。
【0024】
又、図1に示す様に、シールドケース10内には、駆動用ワイヤ13が挿通された2個の回転用ガイド部材23、24が設けられており、このうち、回転用ガイド部材23は後側ハウジング12に隣接して設けられ、回転用ガイド部材24は前側ハウジング11に隣接して設けられている。この回転用ガイド部材23には、図5に示す様に、2つ突出部23a、23bと、2つの溝23c、23dが形成されており、更に2つの突出部23a、23bには、各々、ガイド面23e、23fが形成されている。又、同様に、回転用ガイド部材24には、2つ突出部24a、24bと、2つの溝24c、24dが形成されており、更に2つの突出部24a、24bには、各々、ガイド面24e、24fが形成されている。
【0025】
以上に説明した構成の下で、本実施形態においては、上記清掃部材15の往復移動の際に、清掃部材15が収容された保持部材16を回転させることにより、清掃部材15の往路と復路における放電用ワイヤ13と清掃部材15の当接面を変化させる点に特徴がある。
【0026】
即ち、保持部材16が、回転用ガイド部材24に収容された状態から、放電用ワイヤ13の張架方向(長手方向)に沿って図1に示した矢印22の往路方向(即ち、前側ハウジング11から後側ハウジング12へと移動する方向)に移動する場合は、図6に示す様に、清掃部材15を構成する清掃用パッド15a、15bが放電用ワイヤ13を両側から挟み込む状態となっており、清掃部材15が放電用ワイヤ13の両側面に当接する構成となっているため、この状態下においては、放電用ワイヤ13の外周面のうち両側面を清掃することが可能となる。尚、図1においては、図3において説明した端部16a、16bのうち、前側ハウジング11側に端部16aを、後側ハウジング12側に端部16bを向ける構成で保持部材16を装着しているが、当該端部16a、16bが逆向きとなる様に保持部材16を装着しても良いことは言うまでもない。
【0027】
そして、保持部材16が後側ハウジング12付近まで移動すると、図7に示す様に、当該保持部材16は、後側ハウジング12に隣接して設けられた回転用ガイド部材23に接触する。即ち、保持部材16の端部16b側に設けられた突起部16e(又は、16f)が、回転用ガイド部材23に設けられた突出部23a(又は、23b)に接触するとともに、突出部23a(又は、23b)に形成されたガイド面23e(又は、23f)に当接した状態になる。又、この際、図示はしていないが、保持部材16の端部16b側に設けられた他方の突起部16f(又は、16e)は、回転用ガイド部材23に設けられた他方の突出部23b(又は、23a)に接触するとともに、突出部23b(又は、23a)に形成されたガイド面23f(又は、23e)に当接した状態になる。
【0028】
ここで、保持部材16は前述の駆動用モータ20の駆動力により、更に往路方向22に移動するため、保持部材16の端部16b側に設けられた突起部16e(又は、16f)は、ガイド面23e(又は、23f)に当接した状態で、当該ガイド面23e(又は、23f)に沿って図中の矢印25の方向に摺動する。又、図示はしていないが、この際、保持部材16の端部16b側に設けられた他方の突起部16f(又は、16e)は、他方のガイド面23f(又は、23e)に当接した状態で、当該ガイド面23f(又は、23e)に沿って摺動する。
【0029】
又、この際、これらのガイド面23e、23fは、突起部16e、16fがガイド面23e、23fに沿って摺動しながら図中の矢印26の方向に回転する様に、これらのガイド面を案内する。
【0030】
そして、保持部材16が駆動用モータ20の駆動力により、更に往路方向22に移動すると、突起部16e(又は、16f)が回転用ガイド部材23に形成された溝23c(又は、23d)に係合するとともに、他方の突起部16f(又は、16e)が回転用ガイド部材23に形成された他方の溝23d(又は、23c)に係合する。そうすると、図8に示す様に、保持部材16が放電用ワイヤ13を中心として90度回転し、当該保持部材16が、回転用ガイド部材23に収容された状態になる。
【0031】
保持部材16が、回転用ガイド部材23に収容されると、図2に示す様に、清掃部材15を構成する清掃用パッド15a、15bが放電用ワイヤ13を両側から挟み込む状態となり、清掃部材15が放電用ワイヤ13の上下面に当接する状態となる。即ち、清掃部材15と放電用ワイヤ13との当接面が、図6に示した両側面から図2に示す上下面へと変化する。
【0032】
次いで、この状態下において、駆動用モータ20の駆動方向が逆転し、図9に示す様に、清掃部材15を保持する保持部材16が、放電用ワイヤ13の張架方向(長手方向)に沿って図中の矢印27で示す復路方向(即ち、後側ハウジング12から前側ハウジング11へと移動する方向)に移動を開始する。そして、放電用ワイヤ13の上下面に当接する清掃部材15が、放電用ワイヤ13の上下面の清掃を行いながら、図10に示す状態まで保持部材16が移動してくる。
【0033】
保持部材16が前側ハウジング11付近まで移動すると、図11に示す様に、当該保持部材16は、前側ハウジング11に隣接して設けられた回転用ガイド部材24に接触し、保持部材16の端部16a側に設けられた突起部16c(又は、16d)が、回転用ガイド部材24に設けられた突出部24a(又は、24b)に接触するとともに、突出部24a(又は、24b)に形成されたガイド面24e(又は、24f)に当接した状態になる。又、この際、図示はしていないが、保持部材16の端部16a側に設けられた他方の突起部16d(又は、16c)は、回転用ガイド部材24に設けられた他方の突出部24b(又は、24a)に接触するとともに、突出部24b(又は、24a)に形成されたガイド面24f(又は、24e)に当接した状態になる。
【0034】
又、保持部材16は、前述の駆動用モータ20の駆動力により、更に復路方向27に移動するため、突起部16c(又は、16d)は、ガイド面24e(又は、24f)に当接した状態で、当該ガイド面24e(又は、24f)に沿って図中の矢印28の方向に摺動する。又、図示はしていないが、この際、保持部材16の端部16a側に設けられた他方の突起部16d(又は、16c)は、他方のガイド面24f(又は、24e)に当接した状態で、当該ガイド面24f(又は、24e)に沿って摺動する。即ち、これらのガイド面24e、24fは、突起部16c、16dがガイド面24e、24fに沿って摺動しながら図中の矢印29の方向に回転する様に、これらのガイド面を案内する。
【0035】
そして、保持部材16が駆動用モータ20の駆動力により、更に復路方向27に移動すると、突起部16c(又は、16d)が溝24c(又は、24d)に係合するとともに、他方の突起部16d(又は、16c)が回転用ガイド部材24に形成された他方の溝24d(又は、24c)に係合する。そうすると、図12に示す様に、保持部材16が放電用ワイヤ13を中心として90度回転し、当該保持部材16が、回転用ガイド部材24に収容された状態に戻る。これにより、清掃部材15の往復移動が終了し、放電用ワイヤ13の全面(即ち、上下左右面)の清掃が完了する。
【0036】
尚、本発明は、上記実施形態に限定されるものではなく、本発明の趣旨に基づいて各部の構造、形状等を適宜変更することが可能であり、それらを本発明の範囲から除外するものではない。
【0037】
例えば、上記実施形態においては、2個の清掃用パッドにより清掃部材を構成したが、清掃用パッドの個数はこれに制限されず、1個であっても3個以上であっても良い。例えば、上記実施形態において説明した2個の清掃用パッドのうち1個を削除し、清掃部材を2回往復移動させることにより、放電用ワイヤの全面(即ち、上下左右面)の清掃を行う構成としても良い。
【0038】
【発明の効果】
以上説明した様に、本発明においては、清掃部材の往復移動の際に、当該清掃部材が収容された保持部材を回転用ガイド部材を用いて回転させ、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させることにより、放電用ワイヤの全面を清掃することが可能になる。従って、簡単な構成で放電用ワイヤの汚れを効果的に除去することができ、結果として、画像濃度の変化に伴う放電ムラ等の発生や、複写画質の低下を回避することができる。又、帯電器の長寿命化を図ることが可能になる。
【0039】
又、本発明においては、保持部材を放電用ワイヤを中心として90度回転させ、往路と復路の移動方向を変更する構成となっているため、清掃部材を1往復移動させさえすれば、清掃部材の往路と復路における放電用ワイヤと清掃部材の当接面を変化させ、放電用ワイヤの全面を清掃することが可能になる。従って、当該放電用ワイヤの汚れを容易かつ効果的に除去することができ、結果として、画像濃度の変化に伴う放電ムラ等の発生や、複写画質の低下を回避することができる。又、帯電器の長寿命化を図ることが可能になる。
【図面の簡単な説明】
【図1】は、本発明の実施形態に係る帯電器の清掃装置が装着された帯電ユニットの全体構成を示す斜視図である。
【図2】は、本発明の実施形態に係る帯電器の清掃装置の概略構成を示す断面図である。
【図3】は、本発明の実施形態に係る帯電器の清掃装置における保持部材を示す斜視図である。
【図4】は、本発明の実施形態に係る帯電器の清掃装置が装着された帯電ユニットの全体構成を示す側面図である。
【図5】は、本発明の実施形態に係る帯電器の清掃装置における回転用ガイド部材の概略を示す斜視図である。
【図6】は、本発明の実施形態に係る帯電器の清掃装置の概略構成を示す断面図である。
【図7】は、本発明の実施形態に係る帯電器の清掃装置における保持部材と回転用ガイド部材が接触した状態を示す斜視図である。
【図8】は、本発明の実施形態に係る帯電器の清掃装置における保持部材が回転用ガイド部材に収容された状態を示す斜視図である。
【図9】は、本発明の実施形態に係る帯電器の清掃装置において復路の移動が開始された状態を示す斜視図である。
【図10】は、本発明の実施形態に係る帯電器の清掃装置において復路の移動が終了する直前の状態を示す斜視図である。
【図11】は、本発明の実施形態に係る帯電器の清掃装置における保持部材と回転用ガイド部材が接触した状態を示す斜視図である。
【図12】は、本発明の実施形態に係る帯電器の清掃装置における保持部材が回転用ガイド部材に収容された状態を示す斜視図である。
【図13】は、画像形成装置における画像形成装置本体内の主要部の構成を概略的に示す正面図である。
【図14】は、従来に係る帯電器の清掃装置を示す正面図である。
【図15】は、従来に係る帯電器の清掃装置を示す正面図である。
【符号の説明】
1 感光体ドラム
2 帯電ユニット
3 現像ユニット
4 転写ユニット
5 分離ユニット
6 クリーニングユニット
7 露光ユニット
8 用紙供給経路
10 シールドケース
13 放電用ワイヤ
15 清掃部材
15a、15b 清掃用パッド
16 保持部材
16a、16b、16c、16d 突起部
17 移動部材
20 駆動用モータ
21 ネジ
23 回転用ガイド部材
23a、23b 突出部
23c、23d 溝
24 回転用ガイド部材
24a、24b 突出部
24c、24d 溝
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cleaning device for a charger used in an image forming apparatus such as a digital copying machine, a facsimile, and a printer, and more particularly to a cleaning device for a charger having a cleaning member for cleaning a discharge wire of the charger.
[0002]
[Prior art]
FIG. 13 is a front view schematically showing a configuration of a main part in an image forming apparatus main body in a commonly used image forming apparatus such as a digital copying machine, a facsimile, a printer, or the like. The main part is a photosensitive drum 1 that rotates in one direction (the direction of the arrow in the figure), and a charging unit 2 that faces the photosensitive drum 1 and is disposed along the rotation direction of the photosensitive drum 1. , A developing unit 3, a transfer unit 4, a separation unit 5, and a cleaning unit 6.
[0003]
Under such a configuration, an image of a copy original is read by an original reading unit (not shown), and the surface of the photosensitive drum 1 rotating in the direction of the arrow in FIG. Let me do. Next, light based on the image read by the document reading unit is irradiated onto the surface of the photosensitive drum 1 by the exposure unit 7 to form an electrostatic latent image of the image, and thereafter, the electrostatic latent image is formed by the developing unit 3. A toner image is formed by attaching toner to the image.
[0004]
Further, the transfer unit 4 attracts and transfers the toner image from the photosensitive drum 1 onto a sheet (not shown) supplied between the photosensitive drum 1 and the transfer unit 4 via the sheet supply path 8. You. Thereafter, the sheet on which the toner image has been transferred is separated from the photosensitive drum 1 by the separation unit 5, and is conveyed to a fixing unit (not shown), where the toner image is fixed on the transfer sheet.
[0005]
On the other hand, after the transfer of the toner image by the transfer unit 4, the toner remaining on the surface of the photosensitive drum 1 is completely removed by the cleaning unit 6. Then, the photosensitive drum 1 from which the residual toner has been removed, the residual charge on the surface thereof is removed by a charge removing unit (not shown) composed of a plurality of LEDs and the like, and reaches the charging unit 2.
[0006]
In such an image forming apparatus, when the above-described operation is repeated, the discharge wires provided in the corona chargers such as the charging unit 2, the transfer unit 4, and the separation unit 5 due to toner scattering and paper dust. Come dirty. In particular, there is a problem that silica (SiO 2 ) is generated due to a reaction between silicon contained in the toner and grease and ozone generated in the air by the discharge, and the silica (SiO 2 ) adheres to the discharge wire. If such stains are left undisturbed, the discharge performance is reduced, charging uniformity is lost, discharge unevenness occurs due to a change in image density, and copy image quality is reduced, and the life of these chargers is reduced. Is shortened. Therefore, it is necessary to periodically clean these corona chargers to avoid the above inconvenience.
[0007]
14 and 15 are cross-sectional views of a conventional charger cleaning device. In the cleaning device, a cleaning member 52 is provided on each inner surface of a leg 51 of a support member 50 having a bifurcated leg that can be opened and closed, and a protrusion 53 formed on the leg 51 is moved by a moving member. The supporting member 50 is held by the moving member 54 by engaging with the opening 55 formed in the moving member 54. At this time, as shown in FIG. 14, the projection 53 is engaged with the opening 55 so that the cleaning member 52 sandwiches the discharge wire 56 from both sides. The lower portion of the moving member 54 is fitted into a hole 58 formed in the charger case 57, and the moving member 54 is moved along the direction in which the discharge wire 56 is stretched (longitudinal direction), thereby providing a discharge member. The cleaning of the wire is performed. (For example, see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-3-48871 (pages 5-6, FIG. 3-4)
[0009]
[Problems to be solved by the invention]
However, in the above-described conventional cleaning device, as described above, the cleaning member 52 is configured to sandwich the discharge wire 56 from both sides, and the cleaning member 52 is configured to abut only on both side surfaces of the discharge wire 56. Therefore, even if the moving member 54 is moved along the stretching direction (longitudinal direction) of the discharge wire 56 in this state, the entire surface of the discharge wire 56 cannot be cleaned. Therefore, it is not possible to completely remove the dirt on the discharge wire 56 described above, and as a result, it becomes difficult to avoid the occurrence of discharge unevenness or the like due to the change in image density and the deterioration of copy image quality. However, there has been an inconvenience that the life of the charger is shortened.
[0010]
The present invention solves the above-described problems, cleans the entire surface of the discharge wire with a simple configuration, and avoids the occurrence of discharge unevenness due to a change in image density and a decrease in copy image quality, and reduces the length of the charger. An object of the present invention is to provide a charger cleaning device that can extend the life.
[0011]
[Means for Solving the Problems]
Means for Solving the Problems To achieve the above object, the present invention has a cleaning member that contacts a discharge wire of a charger, and a holding member that holds the cleaning member. In the cleaning device of the charger, the contact surface between the discharge wire and the cleaning member in the forward path and the return path of the cleaning member is changed by rotating the holding member during reciprocation, and the entire surface of the discharge wire is changed. It is characterized by cleaning.
[0012]
According to this configuration, when the cleaning member reciprocates, it is possible to rotate the holding member in which the cleaning member is housed, and change the contact surface between the discharge wire and the cleaning member in the outward path and the return path of the cleaning member. Therefore, it is possible to clean the entire surface of the discharge wire, and it is possible to effectively remove the stain on the discharge wire.
[0013]
Further, the present invention further includes a rotation guide member through which the driving wire is inserted, and the protrusion provided on the holding member slides in a state in which the protrusion contacts the guide surface provided on the rotation guide member. The holding member is rotated by engaging with a groove formed in the rotation guide member.
[0014]
According to this configuration, when the cleaning member reciprocates, the holding member in which the cleaning member is accommodated is rotated by the rotation guide member, and the contact surface between the discharge wire and the cleaning member in the outward path and the return path of the cleaning member is changed. Therefore, it is possible to clean the entire surface of the discharge wire, and it is possible to effectively remove dirt from the discharge wire.
[0015]
Here, in the present invention, the rotation angle of the holding member can be set to 90 degrees. According to this configuration, if the cleaning member is moved by one reciprocation, the contact surface between the discharge wire and the cleaning member in the outward path and the return path of the cleaning member can be changed, and the entire surface of the discharge wire can be cleaned. It is possible to effectively and easily remove dirt from the discharge wire with a simple configuration.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention has a cleaning member that contacts a discharge wire of a charger, and a holding member that holds the cleaning member, and a cleaning device for a charger that cleans a discharge wire by reciprocating the cleaning member. FIG. 1 is a perspective view showing the overall configuration of a charging unit equipped with a charger cleaning device according to an embodiment of the present invention, and FIG. 2 is a charger according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating a holding member of the cleaning device for a charger according to the embodiment of the present invention. It is a side view which shows the whole structure of the charging unit in which the cleaning device of the charger was mounted.
[0017]
Note that the present embodiment is an example in which a charging unit is used as an example of a corona charger such as a charging unit, a transfer unit, and a separation unit. It goes without saying that it is applicable.
[0018]
As shown in FIG. 1, a discharge wire 13 is stretched over a shield case 10 of the charging unit 5 from a front housing 11 provided on the shield case 10 to a rear housing 12. The discharge wire 13 is connected to a predetermined power supply (not shown), and discharges toward the photosensitive drum 1 shown in FIG. 13 to uniformly charge the surface of the photosensitive drum 1.
[0019]
The cleaning device according to the present embodiment includes a cleaning member 15 that contacts the discharge wire 13 of the charging unit 5, a holding member 16 that holds the cleaning member 15, a moving member 17 to which the holding member 16 is attached, It is composed of rotation guide members 23 and 24 through which the discharge wires 13 are inserted.
[0020]
More specifically, as shown in FIG. 3, the cleaning member 15 is composed of two cleaning pads 15a and 15b, and these cleaning pads 15a and 15b are formed of a holding member 16 having a substantially cylindrical shape. It is held on the inner surface and stored in the holding member 16. The holding member 16 is provided with four projections 16c to 16f each having a substantially cylindrical shape. Of these, the projections 16c and 16d are provided on both side surfaces of the end 16a, and the projections 16e and 16e are provided. 16f are provided on both side surfaces of the end 16b.
[0021]
As shown in FIGS. 2 and 4, the holding member 16 is fitted to the moving member 17 via the body 16b ', and holds the holding member 16 rotatably with respect to the moving member 17. It has become. That is, the holding member 16 is held so as to be rotatable with respect to the moving member 17 in the direction of the arrow shown in FIG. The rotation mechanism of the holding member will be described later in detail.
[0022]
As shown in FIGS. 1 and 2, holes 19 are formed in the bottom plate 18 of the shield case 10 along the direction in which the discharge wires 13 are stretched, and are formed at both ends of the moving member 17. By inserting the bottom plate portion 18 into the two groove portions 17a, the moving member 17 is fitted into the hole portion 19, and the moving member 17 fitted with the holding member 16 in which the cleaning member 15 is accommodated is discharged. The cleaning member 15 in contact with the discharge wire 13 is reciprocated by reciprocating along the stretching direction (longitudinal direction) of the 13, and the discharge wire 13 is cleaned.
[0023]
In the present embodiment, a motor is used as a driving unit of the moving member 17. That is, as shown in FIGS. 1 and 4, the drive motor 20 is provided below the rear housing 12 provided in the shield case 10 and is provided along the stretching direction (longitudinal direction) of the discharge wire 13. The screw 21 having a spiral shape is connected to the motor 20. Then, a screw hole 17 c formed in the lower projection 17 b of the moving member 17 shown in FIG. 2 is inserted into the screw 21, and the motor 20 is driven to move the moving member 17 in the stretching direction of the discharge wire 13. The discharge wire 13 is cleaned by reciprocating along the (longitudinal direction). Note that a configuration in which a driving wire is used instead of the screw 21 may be employed.
[0024]
As shown in FIG. 1, two rotating guide members 23 and 24 into which the driving wires 13 are inserted are provided in the shield case 10, of which the rotating guide member 23 is The rotation guide member 24 is provided adjacent to the side housing 12 and the rotation guide member 24 is provided adjacent to the front housing 11. As shown in FIG. 5, the rotation guide member 23 has two protruding portions 23a and 23b and two grooves 23c and 23d. The two protruding portions 23a and 23b respectively have Guide surfaces 23e and 23f are formed. Similarly, the rotation guide member 24 has two protruding portions 24a and 24b and two grooves 24c and 24d, and the two protruding portions 24a and 24b have guide surfaces 24e respectively. , 24f are formed.
[0025]
Under the configuration described above, in the present embodiment, when the cleaning member 15 reciprocates, the holding member 16 in which the cleaning member 15 is accommodated is rotated, so that the cleaning member 15 can move forward and backward. It is characterized in that the contact surface between the discharge wire 13 and the cleaning member 15 is changed.
[0026]
That is, from the state in which the holding member 16 is housed in the rotation guide member 24, the forward direction of the arrow 22 shown in FIG. 6, the cleaning pads 15a and 15b constituting the cleaning member 15 sandwich the discharge wire 13 from both sides, as shown in FIG. Since the cleaning member 15 is configured to abut on both side surfaces of the discharge wire 13, both sides of the outer peripheral surface of the discharge wire 13 can be cleaned in this state. In FIG. 1, the holding member 16 is attached in such a configuration that the end 16a is directed to the front housing 11 and the end 16b is directed to the rear housing 12 among the ends 16a and 16b described in FIG. However, it goes without saying that the holding member 16 may be mounted so that the ends 16a and 16b are turned in the opposite direction.
[0027]
Then, when the holding member 16 moves to the vicinity of the rear housing 12, the holding member 16 comes into contact with a rotation guide member 23 provided adjacent to the rear housing 12 as shown in FIG. 7. That is, the protrusion 16e (or 16f) provided on the end 16b side of the holding member 16 contacts the protrusion 23a (or 23b) provided on the rotation guide member 23, and the protrusion 23a (or 23b). Or, it comes into contact with the guide surface 23e (or 23f) formed on 23b). At this time, although not shown, the other protrusion 16 f (or 16 e) provided on the end 16 b side of the holding member 16 is connected to the other protrusion 23 b provided on the rotation guide member 23. (Or 23a) and comes into contact with the guide surface 23f (or 23e) formed on the protrusion 23b (or 23a).
[0028]
Here, since the holding member 16 is further moved in the outward direction 22 by the driving force of the driving motor 20, the protrusion 16e (or 16f) provided on the end 16b side of the holding member 16 is guided by the guide. In a state of contact with the surface 23e (or 23f), the slider slides along the guide surface 23e (or 23f) in the direction of the arrow 25 in the drawing. Although not shown, at this time, the other protrusion 16f (or 16e) provided on the end 16b side of the holding member 16 abuts on the other guide surface 23f (or 23e). In this state, it slides along the guide surface 23f (or 23e).
[0029]
At this time, these guide surfaces 23e and 23f are arranged such that the protrusions 16e and 16f rotate in the direction of arrow 26 in the figure while sliding along the guide surfaces 23e and 23f. invite.
[0030]
When the holding member 16 further moves in the forward direction 22 by the driving force of the driving motor 20, the protrusion 16e (or 16f) engages with the groove 23c (or 23d) formed in the rotation guide member 23. At the same time, the other protrusion 16f (or 16e) engages with the other groove 23d (or 23c) formed in the rotation guide member 23. Then, as shown in FIG. 8, the holding member 16 rotates 90 degrees around the discharge wire 13, and the holding member 16 is housed in the rotation guide member 23.
[0031]
When the holding member 16 is accommodated in the rotating guide member 23, as shown in FIG. 2, the cleaning pads 15a and 15b constituting the cleaning member 15 sandwich the discharge wire 13 from both sides, and the cleaning member 15 Are in contact with the upper and lower surfaces of the discharge wire 13. That is, the contact surface between the cleaning member 15 and the discharge wire 13 changes from both side surfaces shown in FIG. 6 to upper and lower surfaces shown in FIG.
[0032]
Next, in this state, the driving direction of the driving motor 20 is reversed, and as shown in FIG. 9, the holding member 16 holding the cleaning member 15 is moved along the stretching direction (longitudinal direction) of the discharge wire 13. Then, it starts moving in the backward direction indicated by the arrow 27 in the drawing (that is, the direction moving from the rear housing 12 to the front housing 11). Then, while the cleaning member 15 in contact with the upper and lower surfaces of the discharge wire 13 cleans the upper and lower surfaces of the discharge wire 13, the holding member 16 moves to the state shown in FIG.
[0033]
When the holding member 16 moves to the vicinity of the front housing 11, as shown in FIG. 11, the holding member 16 comes into contact with a rotation guide member 24 provided adjacent to the front housing 11, and the end of the holding member 16. The protrusion 16c (or 16d) provided on the 16a side contacts the protrusion 24a (or 24b) provided on the rotation guide member 24 and is formed on the protrusion 24a (or 24b). The state comes into contact with the guide surface 24e (or 24f). At this time, although not shown, the other protrusion 16 d (or 16 c) provided on the end 16 a side of the holding member 16 is connected to the other protrusion 24 b provided on the rotation guide member 24. (Or 24a) and comes into contact with the guide surface 24f (or 24e) formed on the protruding portion 24b (or 24a).
[0034]
Further, since the holding member 16 is further moved in the backward direction 27 by the driving force of the driving motor 20, the protrusion 16c (or 16d) is in contact with the guide surface 24e (or 24f). Then, it slides along the guide surface 24e (or 24f) in the direction of arrow 28 in the figure. Although not shown, at this time, the other protrusion 16d (or 16c) provided on the end 16a side of the holding member 16 abuts on the other guide surface 24f (or 24e). In this state, it slides along the guide surface 24f (or 24e). That is, these guide surfaces 24e and 24f guide these guide surfaces such that the projections 16c and 16d rotate in the direction of the arrow 29 in the figure while sliding along the guide surfaces 24e and 24f.
[0035]
When the holding member 16 is further moved in the backward direction 27 by the driving force of the driving motor 20, the projection 16c (or 16d) engages with the groove 24c (or 24d) and the other projection 16d. (Or 16c) is engaged with the other groove 24d (or 24c) formed in the rotation guide member 24. Then, as shown in FIG. 12, the holding member 16 rotates 90 degrees around the discharge wire 13, and the holding member 16 returns to the state of being housed in the rotation guide member 24. Thereby, the reciprocating movement of the cleaning member 15 is completed, and the cleaning of the entire surface (that is, the upper, lower, left, and right surfaces) of the discharge wire 13 is completed.
[0036]
It should be noted that the present invention is not limited to the above-described embodiment, and it is possible to appropriately change the structure, shape, and the like of each part based on the gist of the present invention, and exclude them from the scope of the present invention. is not.
[0037]
For example, in the above embodiment, the cleaning member is constituted by two cleaning pads, but the number of cleaning pads is not limited to this, and may be one or three or more. For example, a configuration in which one of the two cleaning pads described in the above embodiment is deleted and the cleaning member is reciprocated twice to clean the entire surface (that is, the upper, lower, left, and right surfaces) of the discharge wire. It is good.
[0038]
【The invention's effect】
As described above, in the present invention, when the cleaning member reciprocates, the holding member in which the cleaning member is housed is rotated by using the rotating guide member, and the discharge wire in the outward path and the return path of the cleaning member. By changing the contact surface of the discharge member and the cleaning member, the entire surface of the discharge wire can be cleaned. Therefore, the stain on the discharge wire can be effectively removed with a simple configuration, and as a result, it is possible to avoid the occurrence of discharge unevenness due to the change in image density and the reduction in copy image quality. Further, the life of the charger can be extended.
[0039]
Further, in the present invention, since the holding member is rotated by 90 degrees around the discharge wire to change the moving directions of the forward path and the backward path, the cleaning member only needs to be reciprocated once. By changing the contact surface between the discharge wire and the cleaning member in the outward path and the return path, the entire surface of the discharge wire can be cleaned. Therefore, the stain on the discharge wire can be easily and effectively removed, and as a result, it is possible to avoid the occurrence of discharge unevenness or the like due to the change in the image density and the deterioration of the copy image quality. Further, the life of the charger can be extended.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a charging unit to which a cleaning device for a charger according to an embodiment of the present invention is attached.
FIG. 2 is a cross-sectional view illustrating a schematic configuration of a cleaning device for a charger according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a holding member in the charger cleaning device according to the embodiment of the present invention.
FIG. 4 is a side view showing an overall configuration of a charging unit to which the cleaning device for a charger according to the embodiment of the present invention is attached.
FIG. 5 is a perspective view schematically showing a rotation guide member in the charger cleaning device according to the embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating a schematic configuration of a cleaning device for a charger according to an embodiment of the present invention.
FIG. 7 is a perspective view showing a state in which a holding member and a rotating guide member are in contact with each other in the charger cleaning device according to the embodiment of the present invention.
FIG. 8 is a perspective view showing a state in which the holding member in the cleaning device for the charger according to the embodiment of the present invention is accommodated in the rotation guide member.
FIG. 9 is a perspective view illustrating a state in which the movement of the return path is started in the charger cleaning device according to the embodiment of the present invention.
FIG. 10 is a perspective view showing a state immediately before the return movement ends in the charger cleaning device according to the embodiment of the present invention.
FIG. 11 is a perspective view showing a state in which a holding member and a rotation guide member are in contact with each other in the cleaning device for a charger according to the embodiment of the present invention.
FIG. 12 is a perspective view showing a state in which the holding member in the cleaning device for the charger according to the embodiment of the present invention is accommodated in the rotation guide member.
FIG. 13 is a front view schematically illustrating a configuration of a main part in an image forming apparatus main body in the image forming apparatus.
FIG. 14 is a front view showing a conventional charger cleaning device.
FIG. 15 is a front view showing a conventional charger cleaning device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 photoconductor drum 2 charging unit 3 developing unit 4 transfer unit 5 separation unit 6 cleaning unit 7 exposure unit 8 paper supply path 10 shield case 13 discharge wire 15 cleaning members 15a, 15b cleaning pad 16 holding members 16a, 16b, 16c , 16d Projection 17 Moving member 20 Drive motor 21 Screw 23 Guide for rotation 23a, 23b Projection 23c, 23d Groove 24 Guide for rotation 24a, 24b Projection 24c, 24d Groove

Claims (3)

帯電器が有する放電用ワイヤと当接する清掃部材と、前記清掃部材を保持する保持部材とを有し、前記清掃部材を往復移動させることにより、前記放電用ワイヤを清掃する帯電器の清掃装置において、
前記往復移動の際に前記保持部材を回転させることにより、前記清掃部材の往路と復路における前記放電用ワイヤと前記清掃部材の当接面を変化させ、前記放電用ワイヤの全面を清掃することを特徴とする帯電器の清掃装置。
A cleaning device for a charger that has a cleaning member that contacts a discharge wire of a charger and a holding member that holds the cleaning member, and that reciprocates the cleaning member to clean the discharge wire. ,
By rotating the holding member at the time of the reciprocating movement, the contact surface between the discharge wire and the cleaning member in the outward path and the return path of the cleaning member is changed, and the entire surface of the discharge wire is cleaned. Characteristic charger cleaning device.
前記駆動用ワイヤが挿通された回転用ガイド部材を更に有し、前記保持部材に設けられた突起部が、前記回転用ガイド部材に設けられたガイド面に当接した状態で摺動するとともに前記回転用ガイド部材に形成された溝に係合することにより前記保持部材が回転することを特徴とする請求項1に記載の帯電器の清掃装置。A rotating guide member through which the driving wire is inserted, wherein the protrusion provided on the holding member slides in a state of contacting a guide surface provided on the rotating guide member, and The charging device cleaning apparatus according to claim 1, wherein the holding member is rotated by engaging with a groove formed in the rotation guide member. 前記保持部材の回転角度が90度であることを特徴とする請求項2に記載の帯電気の清掃装置。The apparatus according to claim 2, wherein a rotation angle of the holding member is 90 degrees.
JP2003061711A 2003-03-07 2003-03-07 Charger cleaning device Expired - Fee Related JP4067430B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006259071A (en) * 2005-03-16 2006-09-28 Kyocera Mita Corp Corona charger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006259071A (en) * 2005-03-16 2006-09-28 Kyocera Mita Corp Corona charger
JP4602129B2 (en) * 2005-03-16 2010-12-22 京セラミタ株式会社 Corona charger

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