JP2002040862A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JP2002040862A JP2002040862A JP2000226580A JP2000226580A JP2002040862A JP 2002040862 A JP2002040862 A JP 2002040862A JP 2000226580 A JP2000226580 A JP 2000226580A JP 2000226580 A JP2000226580 A JP 2000226580A JP 2002040862 A JP2002040862 A JP 2002040862A
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- fixing device
- recording medium
- switching member
- driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、未定着トナーを記
録媒体上に定着させるための定着装置を備えた画像形成
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus provided with a fixing device for fixing unfixed toner on a recording medium.
【０００２】[0002]
【従来の技術】従来から、電子写真による画像形成装置
の定着装置においては、記録媒体が定着ローラに巻付く
などのジャム処理方法を考慮して設計が行われている。2. Description of the Related Art Conventionally, a fixing device of an electrophotographic image forming apparatus has been designed in consideration of a jam processing method such as a recording medium being wound around a fixing roller.
【０００３】以下に、従来の画像形成装置について説明
する。図８は従来の画像形成装置の全体図である。[0003] A conventional image forming apparatus will be described below. FIG. 8 is an overall view of a conventional image forming apparatus.
【０００４】図８において、１は画像形成装置本体、２
は帯電器４ｙ，４ｍ，４ｃ，４ｋにより一様に帯電され
た感光体ドラム３ｙ，３ｍ，３ｃ，３ｋ上にレーザービ
ームにより静電潜像を形成する露光器、５ｙ，５ｍ，５
ｃ，５ｋは静電潜像を顕像化する現像ローラであり、感
光体ドラム３ｙ，３ｍ，３ｃ，３ｋ，帯電器４ｙ，４
ｍ，４ｃ，４ｋ，現像ローラ５ｙ，５ｍ，５ｃ，５ｋは
画像形成ユニット６ｙ，６ｍ，６ｃ，６ｋに一体に構成
されている。７ｙ，７ｍ，７ｃ，７ｋは可視像化された
感光体ドラム３ｙ，３ｍ，３ｃ，３ｋ上のトナー像を後
述する中間転写ベルト上に転写するための第１転写ロー
ラである。８は図中矢印Ａ方向に回動している駆動ロー
ラ９及び従動ローラ１０に張設され、感光体ドラム３
ｙ，３ｍ，３ｃ，３ｋ及び第１転写ローラ７ｙ，７ｍ，
７ｃ，７ｋに狭持され各色のトナー像を重ね合わせるた
めの中間転写ベルト、１１はジャム処理用扉１２に支持
され転写ベルト８上に重ね合わされたトナー像を記録媒
体収納箱１３より搬送されてきた記録媒体１４上に転写
させるための第２転写ローラ、１５は記録媒体１４上の
トナー像を定着させるための定着ユニットである。定着
ユニット１５は、定着ローラ１７及び内部にヒータ１８
を配設したヒートローラ１９に張設され記録媒体１４上
のトナー像を定着するための定着ベルト１６、定着ロー
ラ１７と対向配置され記録媒体１４を狭持するための加
圧ローラ２０、定着ベルト１６のトナーの汚れを解消す
るためのクリーニングローラ２１、記録媒体１４と定着
ベルト１６の離型性を確保するためのオイルを含浸させ
たオイルローラ２２とから構成されている。クリーニン
グローラ２１及びオイルローラ２２を備えたクリーニン
グユニット１５ａは定着ユニット１５から分離可能であ
る。In FIG. 8, reference numeral 1 denotes an image forming apparatus main body;
Exposure units 5y, 5m, and 5 form an electrostatic latent image by a laser beam on photosensitive drums 3y, 3m, 3c, and 3k uniformly charged by chargers 4y, 4m, 4c, and 4k.
Reference numerals c and 5k denote developing rollers for visualizing the electrostatic latent image, and the photosensitive drums 3y, 3m, 3c and 3k, and the chargers 4y and 4
m, 4c, 4k and developing rollers 5y, 5m, 5c, 5k are integrally formed with the image forming units 6y, 6m, 6c, 6k. Reference numerals 7y, 7m, 7c, and 7k denote first transfer rollers for transferring the visualized toner images on the photosensitive drums 3y, 3m, 3c, and 3k onto an intermediate transfer belt described later. Reference numeral 8 denotes a photosensitive drum 3 which is stretched around a driving roller 9 and a driven roller 10 which rotate in the direction of arrow A in FIG.
y, 3m, 3c, 3k and first transfer rollers 7y, 7m,
An intermediate transfer belt 11 sandwiched by 7c and 7k for superimposing toner images of respective colors is supported by a jam processing door 12, and the toner image superimposed on the transfer belt 8 is conveyed from a recording medium storage box 13. A second transfer roller 15 for transferring the image on the recording medium 14 is a fixing unit for fixing the toner image on the recording medium 14. The fixing unit 15 includes a fixing roller 17 and a heater 18 therein.
, A fixing belt 16 for fixing a toner image on the recording medium 14, a pressure roller 20 opposed to the fixing roller 17 for holding the recording medium 14, and a fixing belt The cleaning roller 21 includes a cleaning roller 21 for eliminating contamination of the toner 16, and an oil roller 22 impregnated with oil for ensuring the releasability of the recording medium 14 and the fixing belt 16. The cleaning unit 15 a including the cleaning roller 21 and the oil roller 22 is separable from the fixing unit 15.
【０００５】このような構成の画像形成装置において、
例えばまずイエローの感光体ドラム３ｙ上を帯電器４ｙ
によって一様に帯電させ、露光器２へ伝達された画像情
報に基づいてレーザー光を照射し、イエロー成分色の潜
像が形成される。この潜像は現像ローラ５ｙの薄層化さ
れたトナーによりイエロートナー像として可視像化され
る。可視像化されたトナー像は感光体ドラム３ｙと接触
周回走行している中間転写ベルト８の内面に接触してい
る第１転写ローラ７ｙにより中間転写ベルト８上に転写
される。同様に次色のマゼンタトナー像、シアントナー
像、ブラックトナー像についても画像形成が行われ、中
間転写ベルト８上に４色のトナー像の重ね合わせが終了
する。その後、記録媒体収納箱１３より搬送される記録
媒体１４上に中間転写ベルト８上のトナー像が第２転写
ローラ１１により転写された後、記録媒体１４は定着ユ
ニット１５を通過してトナー像が定着され、矢印Ｂ方向
へと排紙される。In the image forming apparatus having such a configuration,
For example, first, the yellow photosensitive drum 3y is charged on the charger 4y.
Is uniformly charged, and a laser beam is radiated based on the image information transmitted to the exposing device 2 to form a yellow component color latent image. This latent image is visualized as a yellow toner image by the thinned toner of the developing roller 5y. The visualized toner image is transferred onto the intermediate transfer belt 8 by the first transfer roller 7y in contact with the inner surface of the intermediate transfer belt 8 running in contact with the photosensitive drum 3y. Similarly, image formation is performed for the next color magenta toner image, cyan toner image, and black toner image, and the superposition of the four color toner images on the intermediate transfer belt 8 is completed. Then, after the toner image on the intermediate transfer belt 8 is transferred onto the recording medium 14 conveyed from the recording medium storage box 13 by the second transfer roller 11, the recording medium 14 passes through the fixing unit 15 and the toner image is transferred. The sheet is fixed and discharged in the direction of arrow B.
【０００６】つぎに定着ユニット１５の駆動伝達機構に
ついて説明する。図９は従来の定着装置の駆動伝達機構
の斜視図である。２３は画像形成装置本体１の定着駆動
用部材であり、図中矢印Ｃ方向に駆動される。定着駆動
用部材２３には後述する駆動連結部材に備えられた係止
部に図中矢印Ｃ方向のみ係止するよう一方は垂直に他方
は斜め形状の係止部２３ａが形成されている。２４は定
着駆動用部材２３と駆動を連結するための駆動連結部材
であり、スプリング（図示せず）により図中矢印Ｄ方向
に付勢されている。駆動連結部材２４には、定着駆動用
部材２３の係止部２３ａと図中矢印Ｃ方向のみ係止する
よう一方は斜めに他方は垂直形状の係止部２４ａが形成
されている。２５は駆動連結部材２４と同時に回転する
ギアＡ、２６及び２７は加圧ローラ２０に支持されるギ
アＢ、２８はジャム処理用つまみ２９に連結するための
ギアＣである。Next, the drive transmission mechanism of the fixing unit 15 will be described. FIG. 9 is a perspective view of a drive transmission mechanism of a conventional fixing device. A fixing driving member 23 of the image forming apparatus main body 1 is driven in the direction of arrow C in the figure. The fixing driving member 23 is formed with a locking portion 23a that is vertically perpendicular to one side and obliquely shaped to the other so as to lock only in a direction indicated by an arrow C in FIG. Reference numeral 24 denotes a drive connection member for connecting the fixing drive member 23 to the drive, and is urged by a spring (not shown) in the direction of arrow D in the figure. The drive connecting member 24 is formed with a locking portion 24a having one diagonal shape and the other vertical shape so as to lock only with the locking portion 23a of the fixing driving member 23 in the direction of arrow C in the drawing. 25 is a gear A, which rotates simultaneously with the drive connecting member 24, 26 and 27 are gears B supported by the pressure roller 20, and 28 is a gear C for connecting to a jam clearing knob 29.
【０００７】つぎに、定着ユニット１５でジャムが発生
した場合のジャム処理方法について説明する。まず定着
ユニット１５の下流側よりジャム処理を行う場合はジャ
ム処理用つまみ２９を図中矢印Ｅ方向に回転させること
により、ギアＣ２８〜ギアＡ２５を介して駆動連結部材
２４が回転する。ここで画像形成装置本体１に備えられ
た定着駆動用部材２３はジャム処理時は停止しており、
駆動連結部材２４はギアＡ２５内部をスプリング（図示
せず）により図中矢印Ｄ方向に付勢された状態で移動可
能に構成しているため、定着駆動用部材２３に備えた係
止部２３ａの斜面上を駆動連結部材２４に備えた係止部
２４ａの斜面部が係止すること無く円滑に空転し、記録
媒体１４を機外に排出することができる。記録媒体１４
が完全に定着ユニット１５内部にある場合のジャム処理
は定着ユニット１５を画像形成装置本体１より取り外
し、更にクリーニングユニット１５ａを定着ユニット１
５から分離させ、ジャム処理用つまみ２９を併用し記録
媒体１４の除去を行う。Next, a jam clearing method when a jam occurs in the fixing unit 15 will be described. First, when performing the jam processing from the downstream side of the fixing unit 15, the drive connecting member 24 is rotated via the gears C28 to A25 by rotating the jam processing knob 29 in the direction of the arrow E in the drawing. Here, the fixing driving member 23 provided in the image forming apparatus main body 1 is stopped during the jam processing,
The drive connection member 24 is configured to be movable in a state in which the inside of the gear A25 is urged by a spring (not shown) in the direction of arrow D in the figure, so that the locking portion 23a provided on the fixing drive member 23 is provided. The recording medium 14 can be discharged out of the machine smoothly without the slope portion of the locking portion 24a provided on the drive connecting member 24 being locked on the slope surface. Recording medium 14
When the paper jam is completely inside the fixing unit 15, the fixing unit 15 is removed from the image forming apparatus main body 1 and the cleaning unit 15a is further connected to the fixing unit 1.
Then, the recording medium 14 is removed by using the jam processing knob 29 together.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記の
従来の画像形成装置の構成では、以下の問題点を有して
いた。However, the configuration of the above-described conventional image forming apparatus has the following problems.
【０００９】図１０は記録媒体１４が加圧ローラ２０に
巻付いた場合のジャム処理説明図である。加圧ローラ２
０或は定着ベルト１６に記録媒体１４の先端が巻付いた
場合、定着ユニット１５を画像形成装置本体１よりその
まま取り外すと画像形成装置本体１を構成するフレーム
などに記録媒体１４が干渉し、破れたり破片が機内に留
まったりする。そのため、図１０に示すようにジャム処
理用扉１２を開放し図中矢印Ｆ方向より記録媒体１４を
取り除こうとする。その場合、定着駆動用部材２３及び
駆動連結部材２４からなる駆動連結部は記録媒体１４を
下流側に除去する方向にしか空転せず上流側への除去は
できない。したがって、一旦記録媒体１４を定着ユニッ
ト１５内部に巻き取って処理するしかなく、定着ベルト
１６及び加圧ローラ２０の未定着トナーによる汚染がさ
らに悪化したり破損したりすることがあった。FIG. 10 is an explanatory diagram of the jam processing when the recording medium 14 is wound around the pressure roller 20. Pressure roller 2
When the fixing unit 15 is detached from the image forming apparatus main body 1 as it is when the leading end of the recording medium 14 is wound around the fixing belt 16 or the fixing belt 16, the recording medium 14 interferes with a frame or the like constituting the image forming apparatus main body 1 and breaks. Or debris stays in the cabin. Therefore, as shown in FIG. 10, the jam processing door 12 is opened, and the recording medium 14 is to be removed from the direction of arrow F in the figure. In this case, the driving connection portion including the fixing driving member 23 and the driving connection member 24 idles only in a direction in which the recording medium 14 is removed downstream, and cannot be removed upstream. Therefore, the recording medium 14 must be once wound inside the fixing unit 15 for processing, and the contamination of the fixing belt 16 and the pressure roller 20 by the unfixed toner may be further deteriorated or damaged.
【００１０】本発明は上記従来の問題点を解決するもの
で、定着部でのジャム処理を定着ユニットの上流側から
可能にすることでジャム処理の操作性を改善し、ジャム
処理時の定着部品へのダメージを軽減できる定着装置を
提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and improves operability of jam processing by enabling jam processing in a fixing unit from an upstream side of a fixing unit. It is an object of the present invention to provide a fixing device capable of reducing damage to a fixing device.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明の定着装置は、画像形成装置本体との駆動力
を伝達或は解除するための駆動切り替え部材と前記駆動
切り替え部材を動作するための駆動切り替え部材動作レ
バーを備え、ジャム処理を行う場合は駆動切り替え部材
動作レバーを操作し駆動連結を解除することで、加圧ロ
ーラ若しくは定着ベルトに巻き付いた記録媒体を定着ユ
ニットの上流及び下流の両方向に除去可能にしたもので
ある。In order to solve the above-mentioned problems, a fixing device according to the present invention operates a drive switching member for transmitting or canceling a driving force to and from the image forming apparatus main body, and operates the drive switching member. When the jam clearance is to be performed, by operating the drive switching member operation lever to release the drive connection, the recording medium wound around the pressure roller or the fixing belt can be moved upstream of the fixing unit. It can be removed in both directions downstream.
【００１２】[0012]
【発明の実施の形態】請求項１記載の発明は、未定着ト
ナーを溶融加熱し記録媒体上に定着させるための定着装
置において、画像形成装置本体に備えられた定着駆動用
部材からの駆動力を伝達するための駆動連結部材と、駆
動連結部材と定着ローラに支持された定着ギア間に位置
し駆動力の伝達或は解除を行なうための駆動切り替え部
材と、駆動切り替え部材を動作するための駆動切り替え
部材動作レバーを備え、駆動切り替え部材動作レバーを
操作することにより定着装置内部に詰まった記録媒体を
引っ張ったときに定着ローラが空転し、記録媒体を定着
装置の上流及び下流方向に除去可能な構成としたことを
特徴とする定着装置であり、定着部でのジャム処理時の
操作性を改善するという作用を有する。According to the first aspect of the present invention, there is provided a fixing device for fusing and heating an unfixed toner and fixing it on a recording medium, wherein a driving force from a fixing driving member provided in an image forming apparatus main body is provided. , A drive switching member positioned between the drive connection member and the fixing gear supported by the fixing roller for transmitting or releasing a driving force, and a drive switching member for operating the drive switching member. Equipped with a drive switching member operation lever, and by operating the drive switching member operation lever, the fixing roller idles when the recording medium jammed inside the fixing device is pulled, and the recording medium can be removed in the upstream and downstream directions of the fixing device. The fixing device is characterized in that the operability during jam processing in the fixing unit is improved.
【００１３】請求項２記載の発明は、駆動切り替え部材
動作レバーが、定着ニップを形成する定着ローラを変位
させるための定着ローラ変位部材と連動し、定着ローラ
の離接とともに画像形成装置本体との駆動連結を解除す
る構成としたことを特徴とする請求項１記載の定着装置
であり、ジャム処理のため記録媒体を除去しようとした
際に定着ニップでの回転負荷が減少し記録媒体の破れ等
がなくなる。また、未定着トナーによる汚染が軽減する
という作用を有する。According to a second aspect of the present invention, the drive switching member operation lever is interlocked with a fixing roller displacement member for displacing a fixing roller forming a fixing nip, and is connected to and separated from the image forming apparatus main body together with the separation and contact of the fixing roller. 2. The fixing device according to claim 1, wherein the drive connection is released, and when the recording medium is removed for jam clearance, the rotational load at the fixing nip is reduced and the recording medium is broken. Disappears. Further, it has an effect of reducing contamination by unfixed toner.
【００１４】以下に、本発明の実施の形態について説明
する。An embodiment of the present invention will be described below.
【００１５】まず、定着ニップの当離接機構について説
明する。図１は本発明の一実施の形態である定着装置の
定着ニップ当接時の斜視図、図２は本発明の一実施の形
態である定着装置の定着ニップ離接時の断面図である。First, the contact / separation mechanism of the fixing nip will be described. FIG. 1 is a perspective view of a fixing device according to an embodiment of the present invention at the time of contact with a fixing nip, and FIG. 2 is a cross-sectional view of the fixing device of the embodiment of the present invention at the time of fixing nip separation.
【００１６】図１及び図２において、定着ベルト１６，
定着ローラ１７，ヒートローラ１９及び加圧ローラ２０
については従来の定着装置と動作が同一であり同じ番号
を付し説明を省略する。３０は定着ユニット、３１（３
１ａ，３１ｂ），３２（３２ａ，３２ｂ），３３，３４
は定着ローラ１７を加圧ローラ２０側へ加圧するための
加圧リンク機構、３５（３５ａ，３５ｂ）は加圧リンク
機構３４上に支持されたニップ当離接レバーである。定
着ベルト１６、定着ローラ１７及びヒートローラ１９は
一体化され図１において中矢印Ｇ方向に引っ張られてい
る。定着ニップを開放し隙間を確保するには、ニップ当
離接レバー３５を引き上げると加圧リンク機構３１，３
２，３３，３４により定着ローラ１７が加圧ローラ２０
から退避する。In FIG. 1 and FIG.
Fixing roller 17, heat roller 19 and pressure roller 20
The operation of the conventional fixing device is the same as that of the conventional fixing device, and the same reference numeral is assigned, and the description is omitted. 30 is a fixing unit, and 31 (3
1a, 31b), 32 (32a, 32b), 33, 34
Is a pressure link mechanism for pressing the fixing roller 17 toward the pressure roller 20, and 35 (35a, 35b) is a nip contact / separation lever supported on the pressure link mechanism. The fixing belt 16, the fixing roller 17, and the heat roller 19 are integrated and pulled in the direction of the middle arrow G in FIG. In order to open the fixing nip and secure a gap, the nip contact / separation lever 35 is pulled up and the pressure link mechanisms 31 and 3 are opened.
2, 33, 34, the fixing roller 17 is
Evacuate from
【００１７】つぎに、画像形成装置本体との駆動連結を
解除するための駆動解除機構について説明する。図３は
本発明の一実施の形態である定着装置の斜視図、図４は
本発明の一実施の形態である定着装置の駆動解除機構の
分解図Ａ、図５は本発明の一実施の形態である定着装置
の駆動解除機構の分解図Ｂ、図６は本発明の一実施の形
態である定着装置の駆動連結時の断面図、図７は本発明
の一実施の形態である定着装置の駆動解除時の断面図で
ある。Next, a drive release mechanism for releasing the drive connection with the image forming apparatus main body will be described. FIG. 3 is a perspective view of a fixing device according to an embodiment of the present invention, FIG. 4 is an exploded view A of a driving release mechanism of the fixing device according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention. FIG. 6 is an exploded view of a driving release mechanism of a fixing device according to an embodiment, FIG. 6 is a cross-sectional view of the fixing device according to an embodiment of the present invention when driving is connected, and FIG. 7 is a fixing device according to an embodiment of the present invention. FIG. 5 is a cross-sectional view when driving is released.
【００１８】図３〜図７において、３６は定着フレー
ム、３７は定着フレーム３６に支持された回転軸であ
り、後述する可動スペーサ３９の連れ回り回転を防止す
るため可動スペーサ３９の可動領域はＤ形状となってい
る。３８は加圧リンク機構３２に係止するための係止部
３８ｂを備えニップ当離接レバー３５と連動し回転軸３
７回りに回転する駆動切り替え部材動作レバーであり、
駆動切り替え部材動作レバー３８を図中矢印Ｈ方向に回
動させると後述する可動スペーサ３９を図中矢印Ｉ方向
に移動させるための一方が斜め形状の係止部３８ａが備
えられている。３９は駆動切り替え部材動作レバー３８
の回動に伴い矢印Ｇ（図１）方向のみ回転軸３７のＤ形
状領域を可動する可動スペーサであり、一方が斜め形状
の係止部３９ａが備えられている。４０は可動スペーサ
３９と密着した状態で支持され、後述する駆動連結部材
４３の駆動力をギアＡ４２に伝達或は解除を行なうため
の駆動切り替え部材である。駆動切り替え部材４０に
は、常時ギアＡ４２の凸状係止部４２ａに係止する凹状
係止部４０ａと駆動連結時のみ駆動連結部材４３の凸状
係止部４３ａに係止する凹状係止部４０ｂを備えてい
る。４１は駆動切り替え部材４０とギアＡ４２間に挿入
され常に駆動切り替え部材４０及び可動スペーサ３９を
駆動切り替え部材動作レバー３８方向に付勢するスプリ
ング、４３は定着駆動用部材２３と駆動を連結するため
の駆動連結部材であり、定着駆動用部材２３と図４にお
いて矢印Ｃ方向のみ係止するよう一方は斜めに他方は垂
直形状の係止部４３ｂが形成されている。４４は駆動切
り替え部材動作レバー３８から駆動連結部材４３に至る
機構部品を回転軸３７に支持するための止め輪である。In FIGS. 3 to 7, reference numeral 36 denotes a fixing frame, and 37 denotes a rotating shaft supported by the fixing frame 36. The movable area of the movable spacer 39 is D to prevent the movable spacer 39 from rotating together. It has a shape. 38 is provided with a locking portion 38 b for locking to the pressure link mechanism 32, and interlocks with the nip contact / separation lever 35 to rotate the rotary shaft 3.
It is a drive switching member operation lever that rotates about seven times,
When the drive switching member operation lever 38 is rotated in the direction of arrow H in the figure, a locking portion 38a having one oblique shape for moving a movable spacer 39 described later in the direction of arrow I in the figure is provided. 39 is a drive switching member operation lever 38
Is a movable spacer that can move in the D-shaped region of the rotary shaft 37 only in the direction of arrow G (FIG. 1) with the rotation of. Reference numeral 40 denotes a drive switching member that is supported in close contact with the movable spacer 39 and that transmits or releases the driving force of a drive connecting member 43 to be described later to the gear A42. The drive switching member 40 includes a concave locking portion 40a that constantly locks to the convex locking portion 42a of the gear A42 and a concave locking portion that locks to the convex locking portion 43a of the drive connecting member 43 only during driving connection. 40b. Reference numeral 41 denotes a spring which is inserted between the drive switching member 40 and the gear A42 and constantly urges the drive switching member 40 and the movable spacer 39 in the direction of the drive switching member operation lever 38. Reference numeral 43 denotes a connection for connecting the fixing drive member 23 and the drive. One of the driving connection members is formed with a locking portion 43b which is oblique on one side and vertical on the other side so as to lock only to the arrow C direction in FIG. 4 with the fixing driving member 23. Reference numeral 44 denotes a retaining ring for supporting, on the rotating shaft 37, mechanical components from the drive switching member operation lever 38 to the drive connection member 43.
【００１９】駆動連結時は図５，６に示すように、駆動
切り替え部材動作レバー３８に備えられた係止部３８ａ
及び可動スペーサ３９に備えられた係止部３９ａの両者
の頂部が接して駆動切り替え部材４０が図中最も左寄り
となり、駆動連結部材４３に備えられた凸状係止部４３
ａと駆動切り替え部材４０に備えられた凹状係止部４０
ｂが連結し、駆動切り替え部材４０に備えられた凹状係
止部４０ａとギアＡ４２に備えられた凸状係止部４２ａ
は常時連結しているため、駆動連結部材４３の駆動力は
駆動切り替え部材４０を介してギアＡ４２に伝達され更
には加圧ローラ２０に支持されたギアＢ２６へと伝達さ
れる。When the drive is connected, as shown in FIGS. 5 and 6, a locking portion 38a provided on the drive switching member operating lever 38 is provided.
The tops of both locking portions 39 a provided on the movable spacer 39 are in contact with each other, and the drive switching member 40 is at the leftmost position in the drawing, and the convex locking portion 43 provided on the drive connecting member 43.
a and the concave locking portion 40 provided in the drive switching member 40
b are connected to each other, and the concave locking portion 40a provided on the drive switching member 40 and the convex locking portion 42a provided on the gear A42.
Are always connected, the driving force of the drive connecting member 43 is transmitted to the gear A 42 via the drive switching member 40 and further transmitted to the gear B 26 supported by the pressure roller 20.
【００２０】駆動解除時は、図４の矢印Ｈ方向にニップ
当離接レバー３５を引き上げることにより駆動切り替え
部材動作レバー３８に備えられた係止部３８ｂは加圧リ
ンク機構３２と連結しているため、駆動切り替え部材動
作レバー３８が回転軸３７周りに回動する。可動スペー
サ３９は駆動切り替え部材４０と密着した状態でスプリ
ング４１により図中矢印Ｉ方向に付勢されており、連れ
回りを防止するため回転軸３７及び可動スペーサ３９は
Ｄ形状による嵌合がなされている。図７に示すように駆
動切り替え部材動作レバー３８が回動することで駆動切
り替え部材動作レバー３８に備えられた係止部３８ａ間
の凹部に可動スペーサ３９の係止部３９ａの凸部入り込
み、駆動切り替え部材４０は図中最も右寄りとなる。駆
動切り替え部材４０が図中右方向に退避すると、駆動連
結部材４３に備えられた凸状係止部４３ａと駆動切り替
え部材４０に備えられた凹状係止部４０ｂの連結が解除
される。つまり、停止している定着駆動用部材２３に対
して、定着ベルト１６及び加圧ローラ２０は記録媒体１
４を定着ユニット１５の上流及び下流側から除去する両
方向に対し空転可能になる。When the drive is released, the locking portion 38b provided on the drive switching member operating lever 38 is connected to the pressure link mechanism 32 by lifting the nip contact / separation lever 35 in the direction of arrow H in FIG. Therefore, the drive switching member operation lever 38 rotates around the rotation shaft 37. The movable spacer 39 is urged in the direction of arrow I in the figure by a spring 41 in a state in which the movable spacer 39 is in close contact with the drive switching member 40. I have. As shown in FIG. 7, when the drive switching member operation lever 38 rotates, the protrusion of the engagement portion 39a of the movable spacer 39 enters the recess between the engagement portions 38a provided on the drive switching member operation lever 38, and the drive is performed. The switching member 40 is at the rightmost position in the figure. When the drive switching member 40 is retracted rightward in the drawing, the connection between the convex locking portion 43a provided on the drive connecting member 43 and the concave locking portion 40b provided on the drive switching member 40 is released. That is, the fixing belt 16 and the pressure roller 20 are applied to the recording medium 1 with respect to the stopped fixing driving member 23.
4 can be idled in both directions of removing the fixing roller 4 from the upstream and downstream sides of the fixing unit 15.
【００２１】次に、ジャム処理方法について説明する。Next, a jam clearing method will be described.
【００２２】記録媒体１４を定着ユニット３０の下流側
から除去する場合、つまり記録媒体１４の先端が定着ユ
ニット３０から突出し定着ニップ部に狭持された状態若
しくは記録媒体１４の後端が定着ベルト１６に巻付いて
画像形成装置本体１が停止した場合、或は記録媒体１４
を定着ユニット１５の上流側から除去する場合つまり記
録媒体１４の後端が定着ユニット１５から突出し定着ニ
ップ部に狭持された状態若しくは記録媒体１４の先端が
定着ベルト１６或は加圧ローラ２０に巻付いて画像形成
装置本体１が停止した場合は、いずれもニップ当離接レ
バー３５を操作することにより定着ニップ部は離接し、
隙間が空くと共に連結された駆動切り替え部材動作レバ
ー３８により駆動が解除され定着ベルト１６及び加圧ロ
ーラ２０は記録媒体１４を引張することにより空転し、
容易に除去することができる。When the recording medium 14 is removed from the downstream side of the fixing unit 30, that is, when the leading end of the recording medium 14 protrudes from the fixing unit 30 and is held by the fixing nip portion, or the rear end of the recording medium 14 is the fixing belt 16. When the image forming apparatus main body 1 is stopped by being wound around
Is removed from the upstream side of the fixing unit 15, that is, the rear end of the recording medium 14 protrudes from the fixing unit 15 and is held by the fixing nip, or the front end of the recording medium 14 is fixed to the fixing belt 16 or the pressure roller 20. When the image forming apparatus main body 1 is stopped by winding, the fixing nip portion is separated and brought into contact by operating the nip contact / separation lever 35 in any case.
The drive is released by the drive switching member operation lever 38 connected with the gap being opened, and the fixing belt 16 and the pressure roller 20 idle by pulling the recording medium 14,
It can be easily removed.
【００２３】以上のように、本発明の実施の形態では、
定着部で発生したジャム処理を行う場合に、画像形成装
置本体との駆動連結を解除したことにより定着ユニット
の上流及び下流の両方向に記録媒体を取り除くことを可
能にした。また、同時に定着ニップ部に隙間を設けるこ
とで記録媒体を除去しようとした際に定着ニップでの回
転負荷が減少し記録媒体の破れなどがなくなる。また未
定着トナーによる加圧ローラ及び定着ベルトのトナー汚
染を軽減することができる。As described above, in the embodiment of the present invention,
In the case where a jam occurring in the fixing unit is performed, the drive connection with the image forming apparatus main body is released, so that the recording medium can be removed in both the upstream and downstream directions of the fixing unit. At the same time, by providing a gap in the fixing nip portion, when the recording medium is to be removed, the rotational load at the fixing nip is reduced, and the recording medium is not broken. Further, toner contamination of the pressure roller and the fixing belt due to unfixed toner can be reduced.
【００２４】[0024]
【発明の効果】以上のように本発明によれば、定着ユニ
ット部でのジャム処理時に画像形成装置本体との駆動連
結を解除すると共に定着ニップ部に隙間を設けることに
より、ジャム処理の操作性を向上させ、ジャム処理に伴
う定着ベルト及び加圧ローラに対するダメージを軽減さ
せる定着装置を提供することができる。As described above, according to the present invention, the operability of the jam processing is improved by releasing the drive connection with the image forming apparatus main body and providing a gap in the fixing nip during the jam processing in the fixing unit. And a fixing device that reduces damage to the fixing belt and the pressure roller due to the jam processing can be provided.
【図１】本発明の一実施の形態である定着装置の定着ニ
ップ当接時の斜視図FIG. 1 is a perspective view of a fixing device according to an embodiment of the present invention when a fixing nip is in contact with the fixing device.
【図２】本発明の一実施の形態である定着装置の定着ニ
ップ離接時の断面図FIG. 2 is a cross-sectional view of the fixing device according to an embodiment of the present invention when the fixing nip is separated from and connected to the fixing device;
【図３】本発明の一実施の形態である定着装置の斜視図FIG. 3 is a perspective view of a fixing device according to an embodiment of the present invention.
【図４】本発明の一実施の形態である定着装置の駆動解
除機構の分解図FIG. 4 is an exploded view of a driving release mechanism of the fixing device according to the embodiment of the present invention;
【図５】本発明の一実施の形態である定着装置の駆動解
除機構の分解図FIG. 5 is an exploded view of a driving release mechanism of the fixing device according to the embodiment of the present invention;
【図６】本発明の一実施の形態である定着装置の駆動連
結時の断面図FIG. 6 is a cross-sectional view of the fixing device according to the embodiment of the present invention when the driving device is connected to the fixing device;
【図７】本発明の一実施の形態である定着装置の駆動解
除時の断面図FIG. 7 is a cross-sectional view of the fixing device according to the embodiment of the present invention when the driving is released.
【図８】従来の画像形成装置の全体図FIG. 8 is an overall view of a conventional image forming apparatus.
【図９】従来の定着装置の駆動伝達機構の斜視図FIG. 9 is a perspective view of a drive transmission mechanism of a conventional fixing device.
【図１０】記録媒体が加圧ローラに巻付いた場合のジャ
ム処理説明図FIG. 10 is an explanatory diagram of jam processing when a recording medium is wound around a pressure roller.
１４ 記録媒体 １６ 定着ベルト １７ 定着ローラ １８ ヒータ １９ ヒートローラ ２０ 加圧ローラ ２３ 定着駆動用部材 ３０ 定着ユニット ３１，３２，３３，３４ 加圧リンク機構 ３５ ニップ当離接レバー ３６ 定着フレーム ３７ 回転軸 ３８ 駆動切り替え部材動作レバー ３８ａ 係止部 ３８ｂ 係止部 ３９ 可動スペーサ ３９ａ 係止部 ４０ 駆動切り替え部材 ４０ａ 凹状係止部 ４０ｂ 凹状係止部 ４１ スプリング ４２ ギアＡ ４２ａ 凸状係止部 ４３ 駆動連結部材 ４３ａ 凸状係止部 Reference Signs List 14 recording medium 16 fixing belt 17 fixing roller 18 heater 19 heat roller 20 pressure roller 23 fixing driving member 30 fixing unit 31, 32, 33, 34 pressure link mechanism 35 nip contact / separation lever 36 fixing frame 37 rotating shaft 38 Drive switching member operation lever 38a Locking portion 38b Locking portion 39 Movable spacer 39a Locking portion 40 Drive switching member 40a Recessed locking portion 40b Recessed locking portion 41 Spring 42 Gear A 42a Convex locking portion 43 Drive connecting member 43a Convex locking part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 葉山 哲雄 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 田中 伸一 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 2H033 AA29 AA37 BB35 BB37 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Hayama 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinichi Tanaka 1006 Odakadoma Kadoma, Osaka Pref. Terms (reference) 2H033 AA29 AA37 BB35 BB37
Claims (2)
着させるための定着装置において、画像形成装置本体に
備えられた定着駆動用部材からの駆動力を伝達するため
の駆動連結部材と、前記駆動連結部材と定着ローラに支
持された定着ギア間に位置し前記駆動力の伝達或は解除
を行なうための駆動切り替え部材と、前記駆動切り替え
部材を動作するための駆動切り替え部材動作レバーを備
え、前記駆動切り替え部材動作レバーを操作することに
より定着装置内部に詰まった前記記録媒体を引っ張った
ときに前記定着ローラが空転し、前記記録媒体を定着装
置の上流及び下流方向に除去可能な構成としたことを特
徴とする定着装置。1. A fixing device for melting and heating an unfixed toner to fix it on a recording medium, comprising: a driving connecting member for transmitting a driving force from a fixing driving member provided in an image forming apparatus main body; A drive switching member positioned between the drive coupling member and the fixing gear supported by the fixing roller for transmitting or releasing the driving force; and a drive switching member operating lever for operating the drive switching member. When the recording medium jammed inside the fixing device is pulled by operating the drive switching member operation lever, the fixing roller idles and the recording medium can be removed in the upstream and downstream directions of the fixing device. A fixing device.
ニップを形成する前記定着ローラを変位させるための定
着ローラ変位部材と連動し、前記定着ローラの離接とと
もに画像形成装置本体との駆動連結を解除する構成とし
たことを特徴とする請求項１記載の定着装置。2. The image forming apparatus according to claim 1, wherein the drive switching member operating lever is interlocked with a fixing roller displacing member for displacing the fixing roller forming a fixing nip. The fixing device according to claim 1, wherein the fixing device is configured to be released.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000226580A JP2002040862A (en) | 2000-07-27 | 2000-07-27 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000226580A JP2002040862A (en) | 2000-07-27 | 2000-07-27 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002040862A true JP2002040862A (en) | 2002-02-06 |
Family
ID=18720173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000226580A Pending JP2002040862A (en) | 2000-07-27 | 2000-07-27 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002040862A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6782229B2 (en) | 2002-03-29 | 2004-08-24 | Kabushiki Kaisha Toshiba | Fixing device provided in an image forming apparatus and having a mechanism for positioning a peeling member relative to a roller |
| EP1612619A3 (en) * | 2004-06-30 | 2007-09-19 | Ricoh Co., Ltd. | An apparatus for image forming capable of applying a high easily releasable fixing-nip pressure |
| CN100412721C (en) * | 2004-06-30 | 2008-08-20 | 株式会社理光 | Image fixing device and image forming device |
| US20130064585A1 (en) * | 2011-09-14 | 2013-03-14 | Fuji Xerox Co., Ltd. | Fixing device and image forming apparatus |
-
2000
- 2000-07-27 JP JP2000226580A patent/JP2002040862A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6782229B2 (en) | 2002-03-29 | 2004-08-24 | Kabushiki Kaisha Toshiba | Fixing device provided in an image forming apparatus and having a mechanism for positioning a peeling member relative to a roller |
| US7035580B2 (en) | 2002-03-29 | 2006-04-25 | Kabushiki Kaisha Toshiba | Fixing device provided in an image forming apparatus and having a mechanism for positioning a peeling member relative to a roller |
| EP1612619A3 (en) * | 2004-06-30 | 2007-09-19 | Ricoh Co., Ltd. | An apparatus for image forming capable of applying a high easily releasable fixing-nip pressure |
| US7330682B2 (en) | 2004-06-30 | 2008-02-12 | Ricoh Co., Ltd. | Apparatus capable of applying a high fixing-nip pressure which is easily released when a recording sheet is stuck in a fixing mechanism |
| CN100412721C (en) * | 2004-06-30 | 2008-08-20 | 株式会社理光 | Image fixing device and image forming device |
| US20130064585A1 (en) * | 2011-09-14 | 2013-03-14 | Fuji Xerox Co., Ltd. | Fixing device and image forming apparatus |
| US8824927B2 (en) * | 2011-09-14 | 2014-09-02 | Fuji Xerox Co., Ltd. | Fixing device and image forming apparatus including a release member |
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